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Update the code for the iOS demos to handle modern devices. Fixes bug #3337

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This commit is contained in:
Alex Szpakowski 2016-09-25 00:23:35 -03:00
parent 40ecac8e60
commit a8b033d7c4
12 changed files with 233 additions and 143 deletions
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69
Xcode-iOS/Demos/src/fireworks.c
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@ -10,13 +10,13 @@
#include <math.h>
#include <time.h>
#define MILLESECONDS_PER_FRAME 16 /* about 60 frames per second */
#define ACCEL 0.0001f /* acceleration due to gravity, units in pixels per millesecond squared */
#define WIND_RESISTANCE 0.00005f /* acceleration per unit velocity due to wind resistance */
#define MAX_PARTICLES 2000 /* maximum number of particles displayed at once */
static GLuint particleTextureID; /* OpenGL particle texture id */
static SDL_bool pointSizeExtensionSupported; /* is GL_OES_point_size_array supported ? */
static float pointSizeScale;
/*
used to describe what type of particle a given struct particle is.
emitter - this particle flies up, shooting off trail particles, then finally explodes into dust particles.
@ -55,7 +55,7 @@ void initializeParticles(void);
void initializeTexture();
int nextPowerOfTwo(int x);
void drawParticles();
void stepParticles(void);
void stepParticles(double deltaTime);
/* helper function (used in texture loading)
returns next power of two greater than or equal to x
@ -74,8 +74,9 @@ nextPowerOfTwo(int x)
steps each active particle by timestep MILLESECONDS_PER_FRAME
*/
void
stepParticles(void)
stepParticles(double deltaTime)
{
float deltaMilliseconds = deltaTime * 1000;
int i;
struct particle *slot = particles;
struct particle *curr = particles;
@ -93,10 +94,10 @@ stepParticles(void)
curr->isActive = 0;
/* step velocity, then step position */
curr->yvel += ACCEL * MILLESECONDS_PER_FRAME;
curr->yvel += ACCEL * deltaMilliseconds;
curr->xvel += 0.0f;
curr->y += curr->yvel * MILLESECONDS_PER_FRAME;
curr->x += curr->xvel * MILLESECONDS_PER_FRAME;
curr->y += curr->yvel * deltaMilliseconds;
curr->x += curr->xvel * deltaMilliseconds;
/* particle behavior */
if (curr->type == emitter) {
@ -111,29 +112,29 @@ stepParticles(void)
sqrt(curr->xvel * curr->xvel + curr->yvel * curr->yvel);
/* if wind resistance is not powerful enough to stop us completely,
then apply winde resistance, otherwise just stop us completely */
if (WIND_RESISTANCE * MILLESECONDS_PER_FRAME < speed) {
if (WIND_RESISTANCE * deltaMilliseconds < speed) {
float normx = curr->xvel / speed;
float normy = curr->yvel / speed;
curr->xvel -=
normx * WIND_RESISTANCE * MILLESECONDS_PER_FRAME;
normx * WIND_RESISTANCE * deltaMilliseconds;
curr->yvel -=
normy * WIND_RESISTANCE * MILLESECONDS_PER_FRAME;
normy * WIND_RESISTANCE * deltaMilliseconds;
} else {
curr->xvel = curr->yvel = 0; /* stop particle */
}
if (curr->color[3] <= MILLESECONDS_PER_FRAME * 0.1275f) {
if (curr->color[3] <= deltaMilliseconds * 0.1275f) {
/* if this next step will cause us to fade out completely
then just mark for deletion */
curr->isActive = 0;
} else {
/* otherwise, let's fade a bit more */
curr->color[3] -= MILLESECONDS_PER_FRAME * 0.1275f;
curr->color[3] -= deltaMilliseconds * 0.1275f;
}
/* if we're a dust particle, shrink our size */
if (curr->type == dust)
curr->size -= MILLESECONDS_PER_FRAME * 0.010f;
curr->size -= deltaMilliseconds * 0.010f;
}
@ -147,7 +148,7 @@ stepParticles(void)
/* the number of active particles is computed as the difference between
old number of active particles, where slot points, and the
new size of the array, where particles points */
num_active_particles = slot - particles;
num_active_particles = (int) (slot - particles);
}
/*
@ -206,7 +207,7 @@ explodeEmitter(struct particle *emitter)
p->y = emitter->y + emitter->yvel;
p->isActive = 1;
p->type = dust;
p->size = 15;
p->size = 15 * pointSizeScale;
/* inherit emitter's color */
p->color[0] = emitter->color[0];
p->color[1] = emitter->color[1];
@ -244,7 +245,7 @@ spawnTrailFromEmitter(struct particle *emitter)
p->color[3] = (0.7f) * 255;
/* set other attributes */
p->size = 10;
p->size = 10 * pointSizeScale;
p->type = trail;
p->isActive = 1;
@ -298,7 +299,7 @@ spawnEmitterParticle(GLfloat x, GLfloat y)
p->xvel = 0;
p->yvel = -sqrt(2 * ACCEL * (screen_h - y));
/* set other attributes */
p->size = 10;
p->size = 10 * pointSizeScale;
p->type = emitter;
p->isActive = 1;
/* our array has expanded at the end */
@ -363,7 +364,7 @@ main(int argc, char *argv[])
{
SDL_Window *window; /* main window */
SDL_GLContext context;
int w, h;
int drawableW, drawableH;
Uint32 startFrame; /* time frame began to process */
Uint32 endFrame; /* time frame ended processing */
Uint32 delay; /* time to pause waiting to draw next frame */
@ -391,11 +392,19 @@ main(int argc, char *argv[])
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
/* create main window and renderer */
window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
SDL_WINDOW_OPENGL |
SDL_WINDOW_BORDERLESS);
window = SDL_CreateWindow(NULL, 0, 0, 320, 480,
SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS | SDL_WINDOW_ALLOW_HIGHDPI);
context = SDL_GL_CreateContext(window);
/* The window size and drawable size may be different when highdpi is enabled,
* due to the increased pixel density of the drawable. */
SDL_GetWindowSize(window, &screen_w, &screen_h);
SDL_GL_GetDrawableSize(window, &drawableW, &drawableH);
/* In OpenGL, point sizes are always in pixels. We don't want them looking
* tiny on a retina screen. */
pointSizeScale = (float) drawableH / (float) screen_h;
/* load the particle texture */
initializeTexture();
@ -412,8 +421,7 @@ main(int argc, char *argv[])
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
SDL_GetWindowSize(window, &screen_w, &screen_h);
glViewport(0, 0, screen_w, screen_h);
glViewport(0, 0, drawableW, drawableH);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
@ -436,14 +444,14 @@ main(int argc, char *argv[])
glEnableClientState(GL_POINT_SIZE_ARRAY_OES);
} else {
/* if extension not available then all particles have size 10 */
glPointSize(10);
glPointSize(10 * pointSizeScale);
}
done = 0;
/* enter main loop */
while (!done) {
startFrame = SDL_GetTicks();
SDL_Event event;
double deltaTime = updateDeltaTime();
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
done = 1;
@ -454,19 +462,10 @@ main(int argc, char *argv[])
spawnEmitterParticle(x, y);
}
}
stepParticles();
stepParticles(deltaTime);
drawParticles();
SDL_GL_SwapWindow(window);
endFrame = SDL_GetTicks();
/* figure out how much time we have left, and then sleep */
delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
if (delay > MILLESECONDS_PER_FRAME) {
delay = MILLESECONDS_PER_FRAME;
}
if (delay > 0) {
SDL_Delay(delay);
}
SDL_Delay(1);
}
/* delete textures */