sdl-ios-xcode: XCodeiPhoneOS/Demos/src/fireworks.c annotate

annotate XCodeiPhoneOS/Demos/src/fireworks.c @ 3096:ae4e80dbe330

Date: Tue, 17 Feb 2009 14:00:25 +0100 From: Stefan Klug Subject: [SDL] Possible bug, paused audio playing garbage On my WinCE device a paused audio device plays random garbage. This might also be the issue in the thread "sound cracks with SDL_mixer and AUDIO_S16LSB" I don't have that much knowledge of the SDL audio part, but the attached patch fixes it for me, and collapses two redundant ifs. I'm not sure if this is the correct way to fix this. Shouldn't the complete stream conversion part of the RunAudio loop be dependent on the paused property of the device? (not only the call to (*fill)(udata, istream, istream_len). Anyways. Would be great if the patch or a fix could find its way to SVN ;-) Cheers Stefan

author	Sam Lantinga <slouken@libsdl.org>
date	Mon, 23 Mar 2009 05:21:40 +0000
parents	f55c87ae336b
children

rev	line source
2765 f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	1 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	2 * fireworks.c
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	3 * written by Holmes Futrell
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	4 * use however you want
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	5 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	6
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	7 #include "SDL.h"
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	8 #include "SDL_opengles.h"
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	9 #include "common.h"
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	10 #include <math.h>
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	11 #include <time.h>
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	12
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	13 #define MILLESECONDS_PER_FRAME 16 /* about 60 frames per second */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	14 #define ACCEL 0.0001f /* acceleration due to gravity, units in pixels per millesecond squared */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	15 #define WIND_RESISTANCE 0.00005f /* acceleration per unit velocity due to wind resistance */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	16 #define MAX_PARTICLES 2000 /* maximum number of particles displayed at once */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	17
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	18 static GLuint particleTextureID; /* OpenGL particle texture id */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	19 static SDL_bool pointSizeExtensionSupported; /* is GL_OES_point_size_array supported ? */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	20 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	21 used to describe what type of particle a given struct particle is.
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	22 emitter - this particle flies up, shooting off trail particles, then finally explodes into dust particles.
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	23 trail - shoots off, following emitter particle
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	24 dust - radiates outwards from emitter explosion
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	25 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	26 enum particleType
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	27 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	28 emitter = 0,
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	29 trail,
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	30 dust
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	31 };
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	32 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	33 struct particle is used to describe each particle displayed on screen
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	34 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	35 struct particle
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	36 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	37 GLfloat x; /* x position of particle */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	38 GLfloat y; /* y position of particle */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	39 GLubyte color[4]; /* rgba color of particle */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	40 GLfloat size; /* size of particle in pixels */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	41 GLfloat xvel; /* x velocity of particle in pixels per milesecond */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	42 GLfloat yvel; /* y velocity of particle in pixels per millescond */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	43 int isActive; /* if not active, then particle is overwritten */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	44 enum particleType type; /* see enum particleType */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	45 } particles[MAX_PARTICLES]; /* this array holds all our particles */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	46
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	47 static int num_active_particles; /* how many members of the particle array are actually being drawn / animated? */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	48
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	49 /* function declarations */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	50 void spawnTrailFromEmitter(struct particle *emitter);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	51 void spawnEmitterParticle(GLfloat x, GLfloat y);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	52 void explodeEmitter(struct particle *emitter);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	53 void initializeParticles(void);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	54 void initializeTexture();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	55 int nextPowerOfTwo(int x);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	56 void drawParticles();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	57 void stepParticles(void);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	58
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	59 /* helper function (used in texture loading)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	60 returns next power of two greater than or equal to x
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	61 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	62 int
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	63 nextPowerOfTwo(int x)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	64 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	65 int val = 1;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	66 while (val < x) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	67 val *= 2;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	68 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	69 return val;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	70 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	71
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	72 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	73 steps each active particle by timestep MILLESECONDS_PER_FRAME
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	74 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	75 void
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	76 stepParticles(void)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	77 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	78 int i;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	79 struct particle *slot = particles;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	80 struct particle *curr = particles;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	81 for (i = 0; i < num_active_particles; i++) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	82 /* is the particle actually active, or is it marked for deletion? */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	83 if (curr->isActive) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	84 /* is the particle off the screen? */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	85 if (curr->y > SCREEN_HEIGHT)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	86 curr->isActive = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	87 else if (curr->y < 0)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	88 curr->isActive = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	89 if (curr->x > SCREEN_WIDTH)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	90 curr->isActive = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	91 else if (curr->x < 0)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	92 curr->isActive = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	93
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	94 /* step velocity, then step position */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	95 curr->yvel += ACCEL * MILLESECONDS_PER_FRAME;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	96 curr->xvel += 0.0f;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	97 curr->y += curr->yvel * MILLESECONDS_PER_FRAME;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	98 curr->x += curr->xvel * MILLESECONDS_PER_FRAME;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	99
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	100 /* particle behavior */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	101 if (curr->type == emitter) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	102 /* if we're an emitter, spawn a trail */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	103 spawnTrailFromEmitter(curr);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	104 /* if we've reached our peak, explode */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	105 if (curr->yvel > 0.0) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	106 explodeEmitter(curr);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	107 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	108 } else {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	109 float speed =
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	110 sqrt(curr->xvel * curr->xvel + curr->yvel * curr->yvel);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	111 /* if wind resistance is not powerful enough to stop us completely,
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	112 then apply winde resistance, otherwise just stop us completely */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	113 if (WIND_RESISTANCE * MILLESECONDS_PER_FRAME < speed) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	114 float normx = curr->xvel / speed;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	115 float normy = curr->yvel / speed;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	116 curr->xvel -=
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	117 normx * WIND_RESISTANCE * MILLESECONDS_PER_FRAME;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	118 curr->yvel -=
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	119 normy * WIND_RESISTANCE * MILLESECONDS_PER_FRAME;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	120 } else {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	121 curr->xvel = curr->yvel = 0; /* stop particle */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	122 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	123
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	124 if (curr->color[3] <= MILLESECONDS_PER_FRAME * 0.1275f) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	125 /* if this next step will cause us to fade out completely
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	126 then just mark for deletion */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	127 curr->isActive = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	128 } else {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	129 /* otherwise, let's fade a bit more */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	130 curr->color[3] -= MILLESECONDS_PER_FRAME * 0.1275f;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	131 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	132
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	133 /* if we're a dust particle, shrink our size */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	134 if (curr->type == dust)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	135 curr->size -= MILLESECONDS_PER_FRAME * 0.010f;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	136
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	137 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	138
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	139 /* if we're still active, pack ourselves in the array next
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	140 to the last active guy (pack the array tightly) */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	141 if (curr->isActive)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	142 (slot++) = curr;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	143 } /* endif (curr->isActive) */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	144 curr++;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	145 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	146 /* the number of active particles is computed as the difference between
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	147 old number of active particles, where slot points, and the
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	148 new size of the array, where particles points */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	149 num_active_particles = slot - particles;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	150 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	151
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	152 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	153 This draws all the particles shown on screen
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	154 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	155 void
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	156 drawParticles()
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	157 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	158
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	159 /* draw the background */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	160 glClear(GL_COLOR_BUFFER_BIT);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	161
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	162 /* set up the position and color pointers */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	163 glVertexPointer(2, GL_FLOAT, sizeof(struct particle), particles);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	164 glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(struct particle),
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	165 particles[0].color);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	166
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	167 if (pointSizeExtensionSupported) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	168 /* pass in our array of point sizes */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	169 glPointSizePointerOES(GL_FLOAT, sizeof(struct particle),
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	170 &(particles[0].size));
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	171 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	172
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	173 /* draw our particles! */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	174 glDrawArrays(GL_POINTS, 0, num_active_particles);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	175
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	176 /* update screen */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	177 SDL_RenderPresent();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	178
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	179 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	180
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	181 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	182 This causes an emitter to explode in a circular bloom of dust particles
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	183 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	184 void
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	185 explodeEmitter(struct particle *emitter)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	186 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	187 /* first off, we're done with this particle, so turn active off */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	188 emitter->isActive = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	189 int i;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	190 for (i = 0; i < 200; i++) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	191
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	192 if (num_active_particles >= MAX_PARTICLES)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	193 return;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	194
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	195 /* come up with a random angle and speed for new particle */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	196 float theta = randomFloat(0, 2.0f * 3.141592);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	197 float exponent = 3.0f;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	198 float speed = randomFloat(0.00, powf(0.17, exponent));
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	199 speed = powf(speed, 1.0f / exponent);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	200
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	201 /select the particle at the end of our array /
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	202 struct particle *p = &particles[num_active_particles];
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	203
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	204 /* set the particles properties */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	205 p->xvel = speed * cos(theta);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	206 p->yvel = speed * sin(theta);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	207 p->x = emitter->x + emitter->xvel;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	208 p->y = emitter->y + emitter->yvel;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	209 p->isActive = 1;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	210 p->type = dust;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	211 p->size = 15;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	212 /* inherit emitter's color */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	213 p->color[0] = emitter->color[0];
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	214 p->color[1] = emitter->color[1];
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	215 p->color[2] = emitter->color[2];
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	216 p->color[3] = 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	217 /* our array has expanded at the end */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	218 num_active_particles++;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	219 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	220
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	221 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	222
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	223 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	224 This spawns a trail particle from an emitter
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	225 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	226 void
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	227 spawnTrailFromEmitter(struct particle *emitter)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	228 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	229
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	230 if (num_active_particles >= MAX_PARTICLES)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	231 return;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	232
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	233 /* select the particle at the slot at the end of our array */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	234 struct particle *p = &particles[num_active_particles];
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	235
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	236 /* set position and velocity to roughly that of the emitter */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	237 p->x = emitter->x + randomFloat(-3.0, 3.0);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	238 p->y = emitter->y + emitter->size / 2.0f;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	239 p->xvel = emitter->xvel + randomFloat(-0.005, 0.005);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	240 p->yvel = emitter->yvel + 0.1;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	241
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	242 /* set the color to a random-ish orangy type color */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	243 p->color[0] = (0.8f + randomFloat(-0.1, 0.0)) * 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	244 p->color[1] = (0.4f + randomFloat(-0.1, 0.1)) * 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	245 p->color[2] = (0.0f + randomFloat(0.0, 0.2)) * 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	246 p->color[3] = (0.7f) * 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	247
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	248 /* set other attributes */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	249 p->size = 10;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	250 p->type = trail;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	251 p->isActive = 1;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	252
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	253 /* our array has expanded at the end */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	254 num_active_particles++;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	255
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	256 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	257
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	258 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	259 spawns a new emitter particle at the bottom of the screen
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	260 destined for the point (x,y).
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	261 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	262 void
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	263 spawnEmitterParticle(GLfloat x, GLfloat y)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	264 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	265
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	266 if (num_active_particles >= MAX_PARTICLES)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	267 return;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	268
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	269 /* find particle at endpoint of array */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	270 struct particle *p = &particles[num_active_particles];
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	271
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	272 /* set the color randomly */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	273 switch (rand() % 4) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	274 case 0:
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	275 p->color[0] = 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	276 p->color[1] = 100;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	277 p->color[2] = 100;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	278 break;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	279 case 1:
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	280 p->color[0] = 100;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	281 p->color[1] = 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	282 p->color[2] = 100;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	283 break;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	284 case 2:
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	285 p->color[0] = 100;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	286 p->color[1] = 100;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	287 p->color[2] = 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	288 break;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	289 case 3:
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	290 p->color[0] = 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	291 p->color[1] = 150;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	292 p->color[2] = 50;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	293 break;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	294 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	295 p->color[3] = 255;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	296 /* set position to (x, SCREEN_HEIGHT) */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	297 p->x = x;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	298 p->y = SCREEN_HEIGHT;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	299 /* set velocity so that terminal point is (x,y) */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	300 p->xvel = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	301 p->yvel = -sqrt(2 * ACCEL * (SCREEN_HEIGHT - y));
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	302 /* set other attributes */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	303 p->size = 10;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	304 p->type = emitter;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	305 p->isActive = 1;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	306 /* our array has expanded at the end */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	307 num_active_particles++;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	308 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	309
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	310 /* just sets the endpoint of the particle array to element zero */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	311 void
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	312 initializeParticles(void)
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	313 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	314 num_active_particles = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	315 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	316
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	317 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	318 loads the particle texture
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	319 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	320 void
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	321 initializeTexture()
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	322 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	323
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	324 int bpp; /* texture bits per pixel */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	325 Uint32 Rmask, Gmask, Bmask, Amask; /* masks for pixel format passed into OpenGL */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	326 SDL_Surface bmp_surface; / the bmp is loaded here */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	327 SDL_Surface bmp_surface_rgba8888; / this serves as a destination to convert the BMP
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	328 to format passed into OpenGL */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	329
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	330 bmp_surface = SDL_LoadBMP("stroke.bmp");
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	331 if (bmp_surface == NULL) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	332 fatalError("could not load stroke.bmp");
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	333 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	334
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	335 /* Grab info about format that will be passed into OpenGL */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	336 SDL_PixelFormatEnumToMasks(SDL_PIXELFORMAT_ABGR8888, &bpp, &Rmask, &Gmask,
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	337 &Bmask, &Amask);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	338 /* Create surface that will hold pixels passed into OpenGL */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	339 bmp_surface_rgba8888 =
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	340 SDL_CreateRGBSurface(0, bmp_surface->w, bmp_surface->h, bpp, Rmask,
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	341 Gmask, Bmask, Amask);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	342 /* Blit to this surface, effectively converting the format */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	343 SDL_BlitSurface(bmp_surface, NULL, bmp_surface_rgba8888, NULL);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	344
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	345 glGenTextures(1, &particleTextureID);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	346 glBindTexture(GL_TEXTURE_2D, particleTextureID);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	347 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	348 nextPowerOfTwo(bmp_surface->w),
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	349 nextPowerOfTwo(bmp_surface->h),
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	350 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	351 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	352 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	353 /* this is where we actually pass in the pixel data */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	354 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bmp_surface->w, bmp_surface->h, 0,
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	355 GL_RGBA, GL_UNSIGNED_BYTE, bmp_surface_rgba8888->pixels);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	356
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	357 /* free bmp surface and converted bmp surface */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	358 SDL_FreeSurface(bmp_surface);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	359 SDL_FreeSurface(bmp_surface_rgba8888);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	360
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	361 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	362
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	363 int
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	364 main(int argc, char *argv[])
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	365 {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	366
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	367 SDL_WindowID windowID; /* ID of main window */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	368 Uint32 startFrame; /* time frame began to process */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	369 Uint32 endFrame; /* time frame ended processing */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	370 Uint32 delay; /* time to pause waiting to draw next frame */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	371 int done; /* should we clean up and exit? */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	372
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	373 /* initialize SDL */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	374 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	375 fatalError("Could not initialize SDL");
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	376 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	377 /* seed the random number generator */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	378 srand(time(NULL));
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	379 /*
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	380 request some OpenGL parameters
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	381 that may speed drawing
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	382 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	383 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	384 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 6);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	385 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	386 SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 0);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	387 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	388 SDL_GL_SetAttribute(SDL_GL_RETAINED_BACKING, 0);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	389 SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	390
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	391 /* create main window and renderer */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	392 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	393 SDL_WINDOW_OPENGL \| SDL_WINDOW_SHOWN \|
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	394 SDL_WINDOW_BORDERLESS);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	395 SDL_CreateRenderer(windowID, 0, 0);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	396
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	397 /* load the particle texture */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	398 initializeTexture();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	399
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	400 /* check if GL_POINT_SIZE_ARRAY_OES is supported
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	401 this is used to give each particle its own size
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	402 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	403 pointSizeExtensionSupported =
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	404 SDL_GL_ExtensionSupported("GL_OES_point_size_array");
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	405
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	406 /* set up some OpenGL state */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	407 glEnable(GL_TEXTURE_2D);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	408 glEnable(GL_BLEND);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	409 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	410 glEnableClientState(GL_VERTEX_ARRAY);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	411 glEnableClientState(GL_COLOR_ARRAY);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	412
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	413 glEnable(GL_POINT_SPRITE_OES);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	414 glTexEnvi(GL_POINT_SPRITE_OES, GL_COORD_REPLACE_OES, 1);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	415
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	416 if (pointSizeExtensionSupported) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	417 /* we use this to set the sizes of all the particles */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	418 glEnableClientState(GL_POINT_SIZE_ARRAY_OES);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	419 } else {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	420 /* if extension not available then all particles have size 10 */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	421 glPointSize(10);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	422 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	423
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	424 done = 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	425 /* enter main loop */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	426 while (!done) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	427 startFrame = SDL_GetTicks();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	428 SDL_Event event;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	429 while (SDL_PollEvent(&event)) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	430 if (event.type == SDL_QUIT) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	431 done = 1;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	432 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	433 if (event.type == SDL_MOUSEBUTTONDOWN) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	434 int which = event.button.which;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	435 int x, y;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	436 SDL_SelectMouse(which);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	437 SDL_GetMouseState(&x, &y);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	438 spawnEmitterParticle(x, y);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	439 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	440 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	441 stepParticles();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	442 drawParticles();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	443 endFrame = SDL_GetTicks();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	444
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	445 /* figure out how much time we have left, and then sleep */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	446 delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	447 if (delay > MILLESECONDS_PER_FRAME) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	448 delay = MILLESECONDS_PER_FRAME;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	449 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	450 if (delay > 0) {
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	451 SDL_Delay(delay);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	452 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	453 }
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	454
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	455 /* delete textures */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	456 glDeleteTextures(1, &particleTextureID);
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	457 /* shutdown SDL */
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	458 SDL_Quit();
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	459
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	460 return 0;
f55c87ae336b Final merge of Google Summer of Code 2008 work... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	461 }

Mercurial > sdl-ios-xcode

annotate XCodeiPhoneOS/Demos/src/fireworks.c @ 3096:ae4e80dbe330