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annotate XCodeiPhoneOS/Demos/src/fireworks.c @ 2461:f8cd2eecde64 gsoc2008_iphone

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grammar, typos
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Mon, 18 Aug 2008 18:02:43 +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 */
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110 }
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111
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112 if (curr->color[3] <= MILLESECONDS_PER_FRAME * 0.1275f) {
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113 /* if this next step will cause us to fade out completely
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114 then just mark for deletion */
2382
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diff changeset
115 curr->isActive = 0;
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diff changeset
116 }
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diff changeset
117 else {
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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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Holmes Futrell <hfutrell@umail.ucsb.edu>
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diff changeset
121
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122 /* if we're a dust particle, shrink our size */
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123 if (curr->type == dust)
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diff changeset
124 curr->size -= MILLESECONDS_PER_FRAME * 0.010f;
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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
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diff changeset
127
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128 /* if we're still active, pack ourselves in the array next
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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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131 *(slot++) = *curr;
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diff changeset
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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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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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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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);
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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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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
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157 /* draw our particles! */
2382
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158 glDrawArrays(GL_POINTS, 0, num_active_particles);
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159
2382
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160 /* update screen */
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diff changeset
161 SDL_RenderPresent();
2382
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diff changeset
162
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163 }
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164 /*
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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) {
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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++) {
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172
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173 if (num_active_particles >= MAX_PARTICLES)
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174 return;
2382
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175
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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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178 float exponent = 3.0f;
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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.
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diff changeset
180 speed = powf(speed, 1.0f / exponent);
2382
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181
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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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diff changeset
185 /* set the particles properties */
2382
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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>
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diff changeset
190 p->isActive = 1;
36bcf13ccb48 fireworks demo
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diff changeset
191 p->type = dust;
2417
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192 p->size = 15;
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diff changeset
193 /* inherit emitter's color */
2382
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194 p->color[0] = emitter->color[0];
36bcf13ccb48 fireworks demo
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195 p->color[1] = emitter->color[1];
36bcf13ccb48 fireworks demo
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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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198 /* our array has expanded at the end */
2382
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199 num_active_particles++;
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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 /*
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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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parents:
diff changeset
207
2417
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208 if (num_active_particles >= MAX_PARTICLES)
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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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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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
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parents:
diff changeset
223 p->color[2] = (0.0f + randomFloat(0.0, 0.2)) * 255;
36bcf13ccb48 fireworks demo
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parents:
diff changeset
224 p->color[3] = (0.7f) * 255;
2417
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diff changeset
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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Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
228 p->type = trail;
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diff changeset
229 p->isActive = 1;
2417
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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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diff changeset
232 num_active_particles++;
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parents:
diff changeset
233
36bcf13ccb48 fireworks demo
Holmes Futrell <hfutrell@umail.ucsb.edu>
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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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diff changeset
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>
parents: 2382
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>
parents: 2382
diff changeset
239 void spawnEmitterParticle(GLfloat x, GLfloat y) {
2382
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240
2417
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Holmes Futrell <hfutrell@umail.ucsb.edu>
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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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diff changeset
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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diff changeset
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.
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diff changeset
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.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
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>
parents: 2382
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>
parents: 2382
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.
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents: 2382
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
diff changeset
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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Holmes Futrell <hfutrell@umail.ucsb.edu>
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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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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>
parents: 2382
diff changeset
277 /* set other attributes */
2382
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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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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 */
36bcf13ccb48 fireworks demo
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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Holmes Futrell <hfutrell@umail.ucsb.edu>
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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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>
parents:
diff changeset
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 */
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333 Uint32 startFrame; /* time frame began to process */
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334 Uint32 endFrame; /* time frame ended processing */
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335 Uint32 delay; /* time to pause waiting to draw next frame */
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336 int done; /* should we clean up and exit? */
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337
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338 /* initialize SDL */
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339 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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340 fatalError("Could not initialize SDL");
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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 /*
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345 request some OpenGL parameters
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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 */
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348 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
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349 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 6);
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350 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
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351 SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 0);
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352 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
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353 SDL_GL_SetAttribute(SDL_GL_RETAINED_BACKING, 0);
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354 SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
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355
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356 /* create main window and renderer */
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357 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,\
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358 SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN|SDL_WINDOW_BORDERLESS);
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359 SDL_CreateRenderer(windowID, 0, 0);
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360
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361 /* load the particle texture */
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362 initializeTexture();
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363
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364 /* check if GL_POINT_SIZE_ARRAY_OES is supported
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365 this is used to give each particle its own size
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366 */
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367 pointSizeExtensionSupported = SDL_GL_ExtensionSupported("GL_OES_point_size_array");
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368
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369 /* set up some OpenGL state */
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370 glEnable(GL_TEXTURE_2D);
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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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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.
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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.
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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.
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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.
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376 glEnable(GL_POINT_SPRITE_OES);
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377 glTexEnvi(GL_POINT_SPRITE_OES, GL_COORD_REPLACE_OES, 1);
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378
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379 if (pointSizeExtensionSupported) {
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380 /* we use this to set the sizes of all the particles */
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381 glEnableClientState(GL_POINT_SIZE_ARRAY_OES);
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382 }
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383 else {
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384 /* if extension not available then all particles have size 10 */
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385 glPointSize(10);
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386 }
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387
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388 done = 0;
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389 /* enter main loop */
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diff changeset
390 while(!done) {
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391 startFrame = SDL_GetTicks();
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392 SDL_Event event;
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393 while (SDL_PollEvent(&event)) {
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diff changeset
394 if (event.type == SDL_QUIT) {
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395 done = 1;
36bcf13ccb48 fireworks demo
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396 }
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diff changeset
397 if (event.type == SDL_MOUSEBUTTONDOWN) {
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diff changeset
398 int which = event.button.which;
36bcf13ccb48 fireworks demo
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399 int x, y;
36bcf13ccb48 fireworks demo
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400 SDL_SelectMouse(which);
36bcf13ccb48 fireworks demo
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diff changeset
401 SDL_GetMouseState(&x, &y);
36bcf13ccb48 fireworks demo
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402 spawnEmitterParticle(x, y);
36bcf13ccb48 fireworks demo
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403 }
36bcf13ccb48 fireworks demo
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diff changeset
404 }
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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.
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406 drawParticles();
2382
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407 endFrame = SDL_GetTicks();
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diff changeset
408
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diff changeset
409 /* figure out how much time we have left, and then sleep */
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410 delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
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diff changeset
411 if (delay > MILLESECONDS_PER_FRAME) {
36bcf13ccb48 fireworks demo
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diff changeset
412 delay = MILLESECONDS_PER_FRAME;
36bcf13ccb48 fireworks demo
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parents:
diff changeset
413 }
36bcf13ccb48 fireworks demo
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parents:
diff changeset
414 if (delay > 0) {
36bcf13ccb48 fireworks demo
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parents:
diff changeset
415 SDL_Delay(delay);
36bcf13ccb48 fireworks demo
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parents:
diff changeset
416 }
36bcf13ccb48 fireworks demo
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parents:
diff changeset
417 }
36bcf13ccb48 fireworks demo
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parents:
diff changeset
418
36bcf13ccb48 fireworks demo
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diff changeset
419 /* delete textures */
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420 glDeleteTextures(1, &particleTextureID);
2382
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diff changeset
421 /* shutdown SDL */
36bcf13ccb48 fireworks demo
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422 SDL_Quit();
36bcf13ccb48 fireworks demo
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parents:
diff changeset
423
36bcf13ccb48 fireworks demo
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parents:
diff changeset
424 return 0;
36bcf13ccb48 fireworks demo
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parents:
diff changeset
425 }