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A version of testgl2 written using OpenGL ES calls. Necessary because…
… there's no glBegin/glEnd, etc.
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Holmes Futrell
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Aug 15, 2008
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#include <stdlib.h> | ||
#include <stdio.h> | ||
#include <string.h> | ||
#include <math.h> | ||
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#include "common.h" | ||
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#ifdef __IPHONEOS__ | ||
#define HAVE_OPENGLES | ||
#endif | ||
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#ifdef HAVE_OPENGLES | ||
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#include "SDL_opengles.h" | ||
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static CommonState *state; | ||
static SDL_GLContext context; | ||
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ | ||
static void | ||
quit(int rc) | ||
{ | ||
if (context) { | ||
/* SDL_GL_MakeCurrent(0, NULL); *//* doesn't do anything */ | ||
SDL_GL_DeleteContext(context); | ||
} | ||
CommonQuit(state); | ||
exit(rc); | ||
} | ||
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static void | ||
Render() | ||
{ | ||
static GLubyte color[8][4] = { {255, 0, 0, 0}, | ||
{ 255, 0, 0, 255}, | ||
{ 0, 255, 0, 255}, | ||
{ 0, 255, 0, 255}, | ||
{ 0, 255, 0, 255}, | ||
{ 255, 255, 255, 255}, | ||
{ 255, 0, 255, 255}, | ||
{ 0, 0, 255, 255} | ||
}; | ||
static GLfloat cube[8][3] = { {0.5, 0.5, -0.5}, | ||
{0.5f, -0.5f, -0.5f}, | ||
{-0.5f, -0.5f, -0.5f}, | ||
{-0.5f, 0.5f, -0.5f}, | ||
{-0.5f, 0.5f, 0.5f}, | ||
{0.5f, 0.5f, 0.5f}, | ||
{0.5f, -0.5f, 0.5f}, | ||
{-0.5f, -0.5f, 0.5f} | ||
}; | ||
static GLubyte indices[36] = { 0, 3, 4,\ | ||
4, 5, 0,\ | ||
0, 5, 6,\ | ||
6, 1, 0,\ | ||
6, 7, 2,\ | ||
2, 1, 6,\ | ||
7, 4, 3,\ | ||
3, 2, 7,\ | ||
5, 4, 7,\ | ||
7, 6, 5,\ | ||
2, 3, 1,\ | ||
3, 0, 1 }; | ||
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/* Do our drawing, too. */ | ||
glClearColor(0.0, 0.0, 0.0, 1.0); | ||
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); | ||
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/* Draw the cube */ | ||
glColorPointer(4, GL_UNSIGNED_BYTE, 0, color); | ||
glEnableClientState(GL_COLOR_ARRAY); | ||
glVertexPointer(3, GL_FLOAT, 0, cube); | ||
glEnableClientState(GL_VERTEX_ARRAY); | ||
glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, indices); | ||
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glMatrixMode(GL_MODELVIEW); | ||
glRotatef(5.0, 1.0, 1.0, 1.0); | ||
} | ||
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int | ||
main(int argc, char *argv[]) | ||
{ | ||
int fsaa, accel; | ||
int value; | ||
int i, done; | ||
SDL_DisplayMode mode; | ||
SDL_Event event; | ||
Uint32 then, now, frames; | ||
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/* Initialize parameters */ | ||
fsaa = 0; | ||
accel = 0; | ||
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/* Initialize test framework */ | ||
state = CommonCreateState(argv, SDL_INIT_VIDEO); | ||
if (!state) { | ||
return 1; | ||
} | ||
for (i = 1; i < argc;) { | ||
int consumed; | ||
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consumed = CommonArg(state, i); | ||
if (consumed == 0) { | ||
if (SDL_strcasecmp(argv[i], "--fsaa") == 0) { | ||
++fsaa; | ||
consumed = 1; | ||
} else if (SDL_strcasecmp(argv[i], "--accel") == 0) { | ||
++accel; | ||
consumed = 1; | ||
} else { | ||
consumed = -1; | ||
} | ||
} | ||
if (consumed < 0) { | ||
fprintf(stderr, "Usage: %s %s [--fsaa] [--accel]\n", argv[0], | ||
CommonUsage(state)); | ||
quit(1); | ||
} | ||
i += consumed; | ||
} | ||
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/* Set OpenGL parameters */ | ||
state->window_flags |= SDL_WINDOW_OPENGL; | ||
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5); | ||
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5); | ||
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5); | ||
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16); | ||
if (fsaa) { | ||
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1); | ||
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, fsaa); | ||
} | ||
if (accel) { | ||
SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1); | ||
} | ||
if (!CommonInit(state)) { | ||
quit(2); | ||
} | ||
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/* Create OpenGL context */ | ||
context = SDL_GL_CreateContext(state->windows[0]); | ||
if (!context) { | ||
fprintf(stderr, "SDL_GL_CreateContext(): %s\n", SDL_GetError()); | ||
quit(2); | ||
} | ||
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if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) { | ||
SDL_GL_SetSwapInterval(1); | ||
} else { | ||
SDL_GL_SetSwapInterval(0); | ||
} | ||
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SDL_GetCurrentDisplayMode(&mode); | ||
printf("Screen BPP: %d\n", SDL_BITSPERPIXEL(mode.format)); | ||
printf("\n"); | ||
printf("Vendor : %s\n", glGetString(GL_VENDOR)); | ||
printf("Renderer : %s\n", glGetString(GL_RENDERER)); | ||
printf("Version : %s\n", glGetString(GL_VERSION)); | ||
printf("Extensions : %s\n", glGetString(GL_EXTENSIONS)); | ||
printf("\n"); | ||
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SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value); | ||
printf("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value); | ||
SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value); | ||
printf("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value); | ||
SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value); | ||
printf("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value); | ||
SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value); | ||
printf("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", 16, value); | ||
if (fsaa) { | ||
SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value); | ||
printf("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value); | ||
SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value); | ||
printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa, | ||
value); | ||
} | ||
if (accel) { | ||
SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value); | ||
printf("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value); | ||
} | ||
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/* Set rendering settings */ | ||
glMatrixMode(GL_PROJECTION); | ||
glLoadIdentity(); | ||
glOrthof(-2.0, 2.0, -2.0, 2.0, -20.0, 20.0); | ||
glMatrixMode(GL_MODELVIEW); | ||
glLoadIdentity(); | ||
glEnable(GL_DEPTH_TEST); | ||
glDepthFunc(GL_LESS); | ||
glShadeModel(GL_SMOOTH); | ||
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/* Main render loop */ | ||
frames = 0; | ||
then = SDL_GetTicks(); | ||
done = 0; | ||
while (!done) { | ||
/* Check for events */ | ||
++frames; | ||
while (SDL_PollEvent(&event)) { | ||
CommonEvent(state, &event, &done); | ||
} | ||
for (i = 0; i < state->num_windows; ++i) { | ||
int w, h; | ||
SDL_GL_MakeCurrent(state->windows[i], context); | ||
SDL_GetWindowSize(state->windows[i], &w, &h); | ||
glViewport(0, 0, w, h); | ||
Render(); | ||
SDL_GL_SwapWindow(state->windows[i]); | ||
} | ||
} | ||
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/* Print out some timing information */ | ||
now = SDL_GetTicks(); | ||
if (now > then) { | ||
printf("%2.2f frames per second\n", | ||
((double) frames * 1000) / (now - then)); | ||
} | ||
quit(0); | ||
return 0; | ||
} | ||
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#else /* HAVE_OPENGLES */ | ||
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int | ||
main(int argc, char *argv[]) | ||
{ | ||
printf("No OpenGL ES support on this system\n"); | ||
return 1; | ||
} | ||
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#endif /* HAVE_OPENGLES */ |