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annotate XCodeiPhoneOS/Demos/src/fireworks.c @ 2429:2c55b72ba46e gsoc2008_iphone

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testdyngles is exactly what it sounds like -- a version of testdyngl that uses OpenGL ES calls instead of OpenGL. Was necessary to create because glOrtho is called glOrthof in OpenGL ES, and OpenGL ES doesn't have glBegin() type semantics for specifying geometry.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 15 Aug 2008 00:52:52 +0000
parents ac26bd83db1f
children
rev   line source
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1 /*
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2 * fireworks.c
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3 * written by Holmes Futrell
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4 * use however you want
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5 */
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6
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7 #include "SDL.h"
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8 #include "SDL_opengles.h"
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9 #include "common.h"
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10 #include <math.h>
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11 #include <time.h>
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12
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13 #define MILLESECONDS_PER_FRAME 16 /* about 60 frames per second */
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14 #define ACCEL 0.0001f /* acceleration due to gravity, units in pixels per millesecond squared */
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15 #define WIND_RESISTANCE 0.00005f /* acceleration per unit velocity due to wind resistance */
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16 #define MAX_PARTICLES 2000 /* maximum number of particles displayed at once */
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17
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18 static GLuint particleTextureID; /* OpenGL particle texture id */
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19 static SDL_bool pointSizeExtensionSupported; /* is GL_OES_point_size_array supported ? */
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20 /*
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21 used to describe what type of particle a given struct particle is.
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22 emitter - this particle flies up, shooting off trail particles, then finally explodes into dust particles.
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23 trail - shoots off, following emitter particle
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24 dust - radiates outwards from emitter explosion
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25 */
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26 enum particleType {
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27 emitter = 0,
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28 trail,
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29 dust
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30 };
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31 /*
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32 struct particle is used to describe each particle displayed on screen
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33 */
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34 struct particle {
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35 GLfloat x; /* x position of particle */
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36 GLfloat y; /* y position of particle */
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37 GLubyte color[4]; /* rgba color of particle */
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38 GLfloat size; /* size of particle in pixels */
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39 GLfloat xvel; /* x velocity of particle in pixels per milesecond */
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40 GLfloat yvel; /* y velocity of particle in pixels per millescond */
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41 int isActive; /* if not active, then particle is overwritten */
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42 enum particleType type; /* see enum particleType */
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43 } particles[MAX_PARTICLES]; /* this array holds all our particles */
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44
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45 static int num_active_particles; /* how many members of the particle array are actually being drawn / animated? */
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46
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47 /* function declarations */
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48 void spawnTrailFromEmitter(struct particle *emitter);
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49 void spawnEmitterParticle(GLfloat x, GLfloat y);
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50 void explodeEmitter(struct particle *emitter);
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51 void initializeParticles(void);
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52 void initializeTexture();
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53 int nextPowerOfTwo(int x);
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54 void drawParticles();
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55 void stepParticles(void);
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56
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57 /* helper function (used in texture loading)
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58 returns next power of two greater than or equal to x
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59 */
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60 int nextPowerOfTwo(int x) {
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61 int val=1;
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62 while (val < x) {
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63 val *= 2;
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64 }
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65 return val;
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66 }
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67 /*
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68 steps each active particle by timestep MILLESECONDS_PER_FRAME
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69 */
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70 void stepParticles(void) {
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71 int i;
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72 struct particle *slot = particles;
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73 struct particle *curr = particles;
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74 for (i=0; i<num_active_particles; i++) {
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75 /* is the particle actually active, or is it marked for deletion? */
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76 if (curr->isActive) {
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77 /* is the particle off the screen? */
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78 if (curr->y > SCREEN_HEIGHT) curr->isActive = 0;
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79 else if (curr->y < 0) curr->isActive = 0;
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80 if (curr->x > SCREEN_WIDTH) curr->isActive = 0;
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81 else if (curr->x < 0) curr->isActive = 0;
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82
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83 /* step velocity, then step position */
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84 curr->yvel += ACCEL * MILLESECONDS_PER_FRAME;
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85 curr->xvel += 0.0f;
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86 curr->y += curr->yvel * MILLESECONDS_PER_FRAME;
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87 curr->x += curr->xvel * MILLESECONDS_PER_FRAME;
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88
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89 /* particle behavior */
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90 if (curr->type == emitter) {
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91 /* if we're an emitter, spawn a trail */
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92 spawnTrailFromEmitter(curr);
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93 /* if we've reached our peak, explode */
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94 if (curr->yvel > 0.0) {
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95 explodeEmitter(curr);
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96 }
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97 }
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98 else {
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99 float speed = sqrt(curr->xvel*curr->xvel + curr->yvel*curr->yvel);
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100 /* if wind resistance is not powerful enough to stop us completely,
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101 then apply winde resistance, otherwise just stop us completely */
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102 if (WIND_RESISTANCE * MILLESECONDS_PER_FRAME < speed) {
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103 float normx = curr->xvel / speed;
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104 float normy = curr->yvel / speed;
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105 curr->xvel -= normx * WIND_RESISTANCE * MILLESECONDS_PER_FRAME;
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106 curr->yvel -= normy * WIND_RESISTANCE * MILLESECONDS_PER_FRAME;
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107 }
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108 else {
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109 curr->xvel = curr->yvel = 0; /* stop particle */
2382
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110 }
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diff changeset
111
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112 if (curr->color[3] <= MILLESECONDS_PER_FRAME * 0.1275f) {
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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113 /* if this next step will cause us to fade out completely
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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114 then just mark for deletion */
2382
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diff changeset
115 curr->isActive = 0;
36bcf13ccb48 fireworks demo
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diff changeset
116 }
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
117 else {
2417
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118 /* otherwise, let's fade a bit more */
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diff changeset
119 curr->color[3] -= MILLESECONDS_PER_FRAME * 0.1275f;
2382
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diff changeset
120 }
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diff changeset
121
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122 /* if we're a dust particle, shrink our size */
2382
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123 if (curr->type == dust)
36bcf13ccb48 fireworks demo
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diff changeset
124 curr->size -= MILLESECONDS_PER_FRAME * 0.010f;
36bcf13ccb48 fireworks demo
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parents:
diff changeset
125
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
126 }
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
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127
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128 /* if we're still active, pack ourselves in the array next
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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129 to the last active guy (pack the array tightly) */
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130 if (curr->isActive)
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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131 *(slot++) = *curr;
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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132 } /* endif (curr->isActive) */
2382
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133 curr++;
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134 }
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135 /* the number of active particles is computed as the difference between
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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136 old number of active particles, where slot points, and the
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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137 new size of the array, where particles points */
2382
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138 num_active_particles = slot - particles;
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139 }
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140 /*
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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141 This draws all the particles shown on screen
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142 */
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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143 void drawParticles() {
2382
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144
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145 /* draw the background */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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146 glClear(GL_COLOR_BUFFER_BIT);
2382
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147
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148 /* set up the position and color pointers */
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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149 glVertexPointer(2, GL_FLOAT, sizeof(struct particle), particles);
2382
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150 glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(struct particle), particles[0].color);
2417
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151
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152 if (pointSizeExtensionSupported) {
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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153 /* pass in our array of point sizes */
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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154 glPointSizePointerOES(GL_FLOAT, sizeof(struct particle), &(particles[0].size));
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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155 }
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156
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
157 /* draw our particles! */
2382
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158 glDrawArrays(GL_POINTS, 0, num_active_particles);
2417
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159
2382
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160 /* update screen */
2417
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
161 SDL_RenderPresent();
2382
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diff changeset
162
36bcf13ccb48 fireworks demo
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163 }
2417
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164 /*
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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165 This causes an emitter to explode in a circular bloom of dust particles
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166 */
2382
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167 void explodeEmitter(struct particle *emitter) {
2417
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168 /* first off, we're done with this particle, so turn active off */
2382
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169 emitter->isActive = 0;
36bcf13ccb48 fireworks demo
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diff changeset
170 int i;
36bcf13ccb48 fireworks demo
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diff changeset
171 for (i=0; i<200; i++) {
36bcf13ccb48 fireworks demo
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172
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173 if (num_active_particles >= MAX_PARTICLES)
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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174 return;
2382
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175
2417
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diff changeset
176 /* come up with a random angle and speed for new particle */
2382
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177 float theta = randomFloat(0, 2.0f * 3.141592);
2417
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
178 float exponent = 3.0f;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
179 float speed = randomFloat(0.00, powf(0.17, exponent));
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
180 speed = powf(speed, 1.0f / exponent);
2382
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181
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diff changeset
182 /*select the particle at the end of our array */
2382
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diff changeset
183 struct particle *p = &particles[num_active_particles];
2417
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184
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
185 /* set the particles properties */
2382
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parents:
diff changeset
186 p->xvel = speed * cos(theta);
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
187 p->yvel = speed * sin(theta);
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
188 p->x = emitter->x + emitter->xvel;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
189 p->y = emitter->y + emitter->yvel;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
190 p->isActive = 1;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
191 p->type = dust;
2417
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diff changeset
192 p->size = 15;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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diff changeset
193 /* inherit emitter's color */
2382
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diff changeset
194 p->color[0] = emitter->color[0];
36bcf13ccb48 fireworks demo
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diff changeset
195 p->color[1] = emitter->color[1];
36bcf13ccb48 fireworks demo
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parents:
diff changeset
196 p->color[2] = emitter->color[2];
36bcf13ccb48 fireworks demo
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197 p->color[3] = 255;
2417
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diff changeset
198 /* our array has expanded at the end */
2382
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diff changeset
199 num_active_particles++;
36bcf13ccb48 fireworks demo
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parents:
diff changeset
200 }
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
201
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diff changeset
202 }
2417
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203 /*
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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diff changeset
204 This spawns a trail particle from an emitter
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205 */
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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
206 void spawnTrailFromEmitter(struct particle *emitter) {
2382
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diff changeset
207
2417
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diff changeset
208 if (num_active_particles >= MAX_PARTICLES)
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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
209 return;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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diff changeset
210
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
211 /* select the particle at the slot at the end of our array */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
212 struct particle *p = &particles[num_active_particles];
2382
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parents:
diff changeset
213
2417
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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
214 /* set position and velocity to roughly that of the emitter */
2382
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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
215 p->x = emitter->x + randomFloat(-3.0, 3.0);
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
216 p->y = emitter->y + emitter->size / 2.0f;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
217 p->xvel = emitter->xvel + randomFloat(-0.005, 0.005);
36bcf13ccb48 fireworks demo
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parents:
diff changeset
218 p->yvel = emitter->yvel + 0.1;
2417
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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
219
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
220 /* set the color to a random-ish orangy type color */
2382
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parents:
diff changeset
221 p->color[0] = (0.8f + randomFloat(-0.1, 0.0)) * 255;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
222 p->color[1] = (0.4f + randomFloat(-0.1, 0.1)) * 255;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
223 p->color[2] = (0.0f + randomFloat(0.0, 0.2)) * 255;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
224 p->color[3] = (0.7f) * 255;
2417
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225
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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diff changeset
226 /* set other attributes */
2382
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diff changeset
227 p->size = 10;
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diff changeset
228 p->type = trail;
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diff changeset
229 p->isActive = 1;
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diff changeset
230
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
231 /* our array has expanded at the end */
2382
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232 num_active_particles++;
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diff changeset
233
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diff changeset
234 }
2417
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
235 /*
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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236 spawns a new emitter particle at the bottom of the screen
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
237 destined for the point (x,y).
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
238 */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
239 void spawnEmitterParticle(GLfloat x, GLfloat y) {
2382
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240
2417
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diff changeset
241 if (num_active_particles >= MAX_PARTICLES)
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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242 return;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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243
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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244 /* find particle at endpoint of array */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
245 struct particle *p = &particles[num_active_particles];
2382
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246
2417
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247 /* set the color randomly */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
248 switch(rand() % 4) {
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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249 case 0:
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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250 p->color[0] = 255;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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251 p->color[1] = 100;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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252 p->color[2] = 100;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
253 break;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
254 case 1:
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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255 p->color[0] = 100;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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diff changeset
256 p->color[1] = 255;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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257 p->color[2] = 100;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
258 break;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
259 case 2:
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
260 p->color[0] = 100;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
261 p->color[1] = 100;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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diff changeset
262 p->color[2] = 255;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
263 break;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
264 case 3:
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
265 p->color[0] = 255;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
266 p->color[1] = 150;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
267 p->color[2] = 50;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
268 break;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
269 }
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
270 p->color[3] = 255;
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
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271 /* set position to (x, SCREEN_HEIGHT) */
2382
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272 p->x = x;
36bcf13ccb48 fireworks demo
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273 p->y = SCREEN_HEIGHT;
2417
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diff changeset
274 /* set velocity so that terminal point is (x,y) */
2382
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diff changeset
275 p->xvel = 0;
2417
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diff changeset
276 p->yvel = -sqrt(2*ACCEL*(SCREEN_HEIGHT-y));
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
277 /* set other attributes */
2382
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diff changeset
278 p->size = 10;
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279 p->type = emitter;
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diff changeset
280 p->isActive = 1;
2417
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diff changeset
281 /* our array has expanded at the end */
2382
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diff changeset
282 num_active_particles++;
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diff changeset
283 }
36bcf13ccb48 fireworks demo
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diff changeset
284
2417
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diff changeset
285 /* just sets the endpoint of the particle array to element zero */
2382
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diff changeset
286 void initializeParticles(void) {
36bcf13ccb48 fireworks demo
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diff changeset
287 num_active_particles = 0;
36bcf13ccb48 fireworks demo
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diff changeset
288 }
36bcf13ccb48 fireworks demo
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diff changeset
289
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diff changeset
290 /*
2417
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diff changeset
291 loads the particle texture
2382
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diff changeset
292 */
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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
293 void initializeTexture() {
2417
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diff changeset
294
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
295 int bpp; /* texture bits per pixel */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
296 Uint32 Rmask, Gmask, Bmask, Amask; /* masks for pixel format passed into OpenGL */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
297 SDL_Surface *bmp_surface; /* the bmp is loaded here */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
298 SDL_Surface *bmp_surface_rgba8888; /* this serves as a destination to convert the BMP
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
299 to format passed into OpenGL */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
300
2382
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diff changeset
301 bmp_surface = SDL_LoadBMP("stroke.bmp");
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
302 if (bmp_surface == NULL) {
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
303 fatalError("could not load stroke.bmp");
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
304 }
2417
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parents: 2382
diff changeset
305
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
306 /* Grab info about format that will be passed into OpenGL */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
307 SDL_PixelFormatEnumToMasks(SDL_PIXELFORMAT_ABGR8888, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
308 /* Create surface that will hold pixels passed into OpenGL */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
309 bmp_surface_rgba8888 = SDL_CreateRGBSurface(0, bmp_surface->w, bmp_surface->h, bpp, Rmask, Gmask, Bmask, Amask);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
310 /* Blit to this surface, effectively converting the format */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
311 SDL_BlitSurface(bmp_surface, NULL, bmp_surface_rgba8888, NULL);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
312
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
313 glGenTextures(1, &particleTextureID);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
314 glBindTexture(GL_TEXTURE_2D, particleTextureID);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
315 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,\
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
316 nextPowerOfTwo(bmp_surface->w),\
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
317 nextPowerOfTwo(bmp_surface->h),\
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
318 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
319 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
320 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
321 /* this is where we actually pass in the pixel data */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
322 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bmp_surface->w, bmp_surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, bmp_surface_rgba8888->pixels);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
323
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
324 /* free bmp surface and converted bmp surface */
2382
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parents:
diff changeset
325 SDL_FreeSurface(bmp_surface);
2417
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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
326 SDL_FreeSurface(bmp_surface_rgba8888);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
327
2382
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parents:
diff changeset
328 }
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
329
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
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330 int main(int argc, char *argv[]) {
36bcf13ccb48 fireworks demo
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331
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332 SDL_WindowID windowID; /* ID of main window */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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333 Uint32 startFrame; /* time frame began to process */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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334 Uint32 endFrame; /* time frame ended processing */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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335 Uint32 delay; /* time to pause waiting to draw next frame */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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336 int done; /* should we clean up and exit? */
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337
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
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338 /* initialize SDL */
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
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339 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
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340 fatalError("Could not initialize SDL");
36bcf13ccb48 fireworks demo
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341 }
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342 /* seed the random number generator */
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343 srand(time(NULL));
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344 /*
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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345 request some OpenGL parameters
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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346 that may speed drawing
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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347 */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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348 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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349 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 6);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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350 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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351 SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 0);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
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352 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
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353 SDL_GL_SetAttribute(SDL_GL_RETAINED_BACKING, 0);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
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354 SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
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355
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356 /* create main window and renderer */
36bcf13ccb48 fireworks demo
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357 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,\
36bcf13ccb48 fireworks demo
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diff changeset
358 SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN|SDL_WINDOW_BORDERLESS);
36bcf13ccb48 fireworks demo
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359 SDL_CreateRenderer(windowID, 0, 0);
36bcf13ccb48 fireworks demo
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360
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361 /* load the particle texture */
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362 initializeTexture();
36bcf13ccb48 fireworks demo
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363
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364 /* check if GL_POINT_SIZE_ARRAY_OES is supported
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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365 this is used to give each particle its own size
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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366 */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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367 pointSizeExtensionSupported = SDL_GL_ExtensionSupported("GL_OES_point_size_array");
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
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368
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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369 /* set up some OpenGL state */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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370 glEnable(GL_TEXTURE_2D);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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371 glEnable(GL_BLEND);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
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372 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
373 glEnableClientState(GL_VERTEX_ARRAY);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
374 glEnableClientState(GL_COLOR_ARRAY);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
375
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
diff changeset
376 glEnable(GL_POINT_SPRITE_OES);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
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377 glTexEnvi(GL_POINT_SPRITE_OES, GL_COORD_REPLACE_OES, 1);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
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378
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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379 if (pointSizeExtensionSupported) {
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
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380 /* we use this to set the sizes of all the particles */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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381 glEnableClientState(GL_POINT_SIZE_ARRAY_OES);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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382 }
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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383 else {
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
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384 /* if extension not available then all particles have size 10 */
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
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385 glPointSize(10);
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
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386 }
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
diff changeset
387
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388 done = 0;
36bcf13ccb48 fireworks demo
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diff changeset
389 /* enter main loop */
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
390 while(!done) {
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
391 startFrame = SDL_GetTicks();
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
392 SDL_Event event;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
393 while (SDL_PollEvent(&event)) {
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
394 if (event.type == SDL_QUIT) {
36bcf13ccb48 fireworks demo
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diff changeset
395 done = 1;
36bcf13ccb48 fireworks demo
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parents:
diff changeset
396 }
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
397 if (event.type == SDL_MOUSEBUTTONDOWN) {
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
398 int which = event.button.which;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
399 int x, y;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
400 SDL_SelectMouse(which);
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
401 SDL_GetMouseState(&x, &y);
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
402 spawnEmitterParticle(x, y);
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
403 }
36bcf13ccb48 fireworks demo
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parents:
diff changeset
404 }
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ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
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parents: 2382
diff changeset
405 stepParticles();
ac26bd83db1f Cleaned up code, added comments, added randomized colors, added check for extension GL_POINT_SIZE_ARRAY_OES, which not all OpenGL ES systems have.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
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406 drawParticles();
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diff changeset
407 endFrame = SDL_GetTicks();
36bcf13ccb48 fireworks demo
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parents:
diff changeset
408
36bcf13ccb48 fireworks demo
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parents:
diff changeset
409 /* figure out how much time we have left, and then sleep */
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
410 delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
411 if (delay > MILLESECONDS_PER_FRAME) {
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
412 delay = MILLESECONDS_PER_FRAME;
36bcf13ccb48 fireworks demo
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parents:
diff changeset
413 }
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
414 if (delay > 0) {
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
415 SDL_Delay(delay);
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
416 }
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
417 }
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
418
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
419 /* delete textures */
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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
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420 glDeleteTextures(1, &particleTextureID);
2382
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parents:
diff changeset
421 /* shutdown SDL */
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
422 SDL_Quit();
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
423
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
424 return 0;
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
425 }