/*
* Create shader, load in source, compile, dump debug as necessary.
*
* shader: Pointer to return created shader ID.
* source: Passed-in shader source code.
* shader_type: Passed to GL, e.g. GL_VERTEX_SHADER.
*/
void
process_shader(GLuint *shader, const char * source, GLint shader_type)
{
GLint status = GL_FALSE;
const char *shaders[1] = { NULL };
char buffer[1024];
GLsizei length;
/* Create shader and load into GL. */
*shader = GL_CHECK(ctx.glCreateShader(shader_type));
shaders[0] = source;
GL_CHECK(ctx.glShaderSource(*shader, 1, shaders, NULL));
/* Clean up shader source. */
shaders[0] = NULL;
/* Try compiling the shader. */
GL_CHECK(ctx.glCompileShader(*shader));
GL_CHECK(ctx.glGetShaderiv(*shader, GL_COMPILE_STATUS, &status));
/* Dump debug info (source and log) if compilation failed. */
if(status != GL_TRUE) {
ctx.glGetProgramInfoLog(*shader, sizeof(buffer), &length, &buffer[0]);
buffer[length] = '\0';
SDL_Log("Shader compilation failed: %s", buffer);fflush(stderr);
quit(-1);
}
}
/*
* Create shader, load in source, compile, dump debug as necessary.
*
* shader: Pointer to return created shader ID.
* source: Passed-in shader source code.
* shader_type: Passed to GL, e.g. GL_VERTEX_SHADER.
*/
void
process_shader(GLuint *shader, const char * source, GLint shader_type)
{
GLint status = GL_FALSE;
const char *shaders[1] = { NULL };
/* Create shader and load into GL. */
*shader = GL_CHECK(ctx.glCreateShader(shader_type));
shaders[0] = source;
GL_CHECK(ctx.glShaderSource(*shader, 1, shaders, NULL));
/* Clean up shader source. */
shaders[0] = NULL;
/* Try compiling the shader. */
GL_CHECK(ctx.glCompileShader(*shader));
GL_CHECK(ctx.glGetShaderiv(*shader, GL_COMPILE_STATUS, &status));
// Dump debug info (source and log) if compilation failed.
if(status != GL_TRUE) {
SDL_Log("Shader compilation failed");
quit(-1);
}
}
void loop()
{
SDL_Event event;
int i;
int status;
/* Check for events */
++frames;
while (SDL_PollEvent(&event) && !done) {
switch (event.type) {
case SDL_WINDOWEVENT:
switch (event.window.event) {
case SDL_WINDOWEVENT_RESIZED:
for (i = 0; i < state->num_windows; ++i) {
if (event.window.windowID == SDL_GetWindowID(state->windows[i])) {
int w, h;
status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
if (status) {
SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
break;
}
/* Change view port to the new window dimensions */
SDL_GL_GetDrawableSize(state->windows[i], &w, &h);
ctx.glViewport(0, 0, w, h);
state->window_w = event.window.data1;
state->window_h = event.window.data2;
/* Update window content */
Render(event.window.data1, event.window.data2, &datas[i]);
SDL_GL_SwapWindow(state->windows[i]);
break;
}
}
break;
}
}
SDLTest_CommonEvent(state, &event, &done);
}
if (!done) {
for (i = 0; i < state->num_windows; ++i) {
status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
if (status) {
SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
/* Continue for next window */
continue;
}
Render(state->window_w, state->window_h, &datas[i]);
SDL_GL_SwapWindow(state->windows[i]);
}
}
#ifdef __EMSCRIPTEN__
else {
emscripten_cancel_main_loop();
}
#endif
}
static void
Render(unsigned int width, unsigned int height, shader_data* data)
{
float matrix_rotate[16], matrix_modelview[16], matrix_perspective[16], matrix_mvp[16];
/*
* Do some rotation with Euler angles. It is not a fixed axis as
* quaterions would be, but the effect is cool.
*/
rotate_matrix((float)data->angle_x, 1.0f, 0.0f, 0.0f, matrix_modelview);
rotate_matrix((float)data->angle_y, 0.0f, 1.0f, 0.0f, matrix_rotate);
multiply_matrix(matrix_rotate, matrix_modelview, matrix_modelview);
rotate_matrix((float)data->angle_z, 0.0f, 1.0f, 0.0f, matrix_rotate);
multiply_matrix(matrix_rotate, matrix_modelview, matrix_modelview);
/* Pull the camera back from the cube */
matrix_modelview[14] -= 2.5;
perspective_matrix(45.0f, (float)width/height, 0.01f, 100.0f, matrix_perspective);
multiply_matrix(matrix_perspective, matrix_modelview, matrix_mvp);
GL_CHECK(ctx.glUniformMatrix4fv(data->attr_mvp, 1, GL_FALSE, matrix_mvp));
data->angle_x += 3;
data->angle_y += 2;
data->angle_z += 1;
if(data->angle_x >= 360) data->angle_x -= 360;
if(data->angle_x < 0) data->angle_x += 360;
if(data->angle_y >= 360) data->angle_y -= 360;
if(data->angle_y < 0) data->angle_y += 360;
if(data->angle_z >= 360) data->angle_z -= 360;
if(data->angle_z < 0) data->angle_z += 360;
GL_CHECK(ctx.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT));
GL_CHECK(ctx.glDrawArrays(GL_TRIANGLES, 0, 36));
}
int
main(int argc, char *argv[])
{
int fsaa, accel;
int value;
int i;
SDL_DisplayMode mode;
Uint32 then, now;
int status;
shader_data *data;
/* Initialize parameters */
fsaa = 0;
accel = 0;
/* Initialize test framework */
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
}
for (i = 1; i < argc;) {
int consumed;
consumed = SDLTest_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 if (SDL_strcasecmp(argv[i], "--zdepth") == 0) {
i++;
if (!argv[i]) {
consumed = -1;
} else {
depth = SDL_atoi(argv[i]);
consumed = 1;
}
} else {
consumed = -1;
}
}
if (consumed < 0) {
SDL_Log ("Usage: %s %s [--fsaa] [--accel] [--zdepth %%d]\n", argv[0],
SDLTest_CommonUsage(state));
quit(1);
}
i += consumed;
}
/* Set OpenGL parameters */
state->window_flags |= SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_BORDERLESS;
state->gl_red_size = 5;
state->gl_green_size = 5;
state->gl_blue_size = 5;
state->gl_depth_size = depth;
state->gl_major_version = 2;
state->gl_minor_version = 0;
state->gl_profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
if (fsaa) {
state->gl_multisamplebuffers=1;
state->gl_multisamplesamples=fsaa;
}
if (accel) {
state->gl_accelerated=1;
}
if (!SDLTest_CommonInit(state)) {
quit(2);
return 0;
}
context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(context));
if (context == NULL) {
SDL_Log("Out of memory!\n");
quit(2);
}
/* Create OpenGL ES contexts */
for (i = 0; i < state->num_windows; i++) {
context[i] = SDL_GL_CreateContext(state->windows[i]);
if (!context[i]) {
SDL_Log("SDL_GL_CreateContext(): %s\n", SDL_GetError());
quit(2);
}
}
/* Important: call this *after* creating the context */
if (LoadContext(&ctx) < 0) {
SDL_Log("Could not load GLES2 functions\n");
quit(2);
return 0;
}
/* from here on out, it should be ok to call gles 2.0 routines */
if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
SDL_GL_SetSwapInterval(1);
} else {
SDL_GL_SetSwapInterval(0);
}
SDL_Log("first call address is %llx data is %lx\n",(long long)(&glGetString),GL_VENDOR);
const char *test = ctx.glGetString(GL_VENDOR);
if (test) {
SDL_Log("we got %s\n",test);
}
else {
SDL_Log("we got a null.\n");
quit(2);
}
SDL_Log("try again call address is %lx\n",(long long)(&glGetString));
SDL_Log("first ctx address is %llx data is %lx ind %llx\n",(long long)(ctx.glGetString),GL_VENDOR,((long long *)(ctx.glGetString))[0] );
{const char *test = glGetString(GL_VENDOR);
if (test) {
SDL_Log("we got %s\n",test);
}
else {
SDL_Log("we got a null.\n");
quit(2);
}
}
SDL_GetCurrentDisplayMode(0, &mode);
SDL_Log("Screen bpp: %d\n", SDL_BITSPERPIXEL(mode.format));
SDL_Log("\n");
SDL_Log("Vendor : %s\n", glGetString(GL_VENDOR));
SDL_Log("Renderer : %s\n", glGetString(GL_RENDERER));
SDL_Log("Version : %s\n", glGetString(GL_VERSION));
SDL_Log("Extensions : %s\n", glGetString(GL_EXTENSIONS));
SDL_Log("\n");
status = SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);
if (!status) {
SDL_Log("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value);
} else {
SDL_Log( "Failed to get SDL_GL_RED_SIZE: %s\n",
SDL_GetError());
}
status = SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);
if (!status) {
SDL_Log("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value);
} else {
SDL_Log( "Failed to get SDL_GL_GREEN_SIZE: %s\n",
SDL_GetError());
}
status = SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);
if (!status) {
SDL_Log("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value);
} else {
SDL_Log( "Failed to get SDL_GL_BLUE_SIZE: %s\n",
SDL_GetError());
}
status = SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);
if (!status) {
SDL_Log("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", depth, value);
} else {
SDL_Log( "Failed to get SDL_GL_DEPTH_SIZE: %s\n",
SDL_GetError());
}
if (fsaa) {
status = SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);
if (!status) {
SDL_Log("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
} else {
SDL_Log( "Failed to get SDL_GL_MULTISAMPLEBUFFERS: %s\n",
SDL_GetError());
}
status = SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);
if (!status) {
SDL_Log("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
value);
} else {
SDL_Log( "Failed to get SDL_GL_MULTISAMPLESAMPLES: %s\n",
SDL_GetError());
}
}
if (accel) {
status = SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);
if (!status) {
SDL_Log("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);
} else {
SDL_Log( "Failed to get SDL_GL_ACCELERATED_VISUAL: %s\n",
SDL_GetError());
}
}
datas = (shader_data *)SDL_calloc(state->num_windows, sizeof(shader_data));
/* Set rendering settings for each context */
for (i = 0; i < state->num_windows; ++i) {
int w, h;
status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
if (status) {
SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
/* Continue for next window */
continue;
}
SDL_GL_GetDrawableSize(state->windows[i], &w, &h);
glViewport(0, 0, w, h);
data = &datas[i];
data->angle_x = 0; data->angle_y = 0; data->angle_z = 0;
/* Shader Initialization */
process_shader(&data->shader_vert, _shader_vert_src, GL_VERTEX_SHADER);
process_shader(&data->shader_frag, _shader_frag_src, GL_FRAGMENT_SHADER);
/* Create shader_program (ready to attach shaders) */
data->shader_program = GL_CHECK(glCreateProgram());
/* Attach shaders and link shader_program */
GL_CHECK(glAttachShader(data->shader_program, data->shader_vert));
GL_CHECK(glAttachShader(data->shader_program, data->shader_frag));
GL_CHECK(glLinkProgram(data->shader_program));
/* Get attribute locations of non-fixed attributes like color and texture coordinates. */
data->attr_position = GL_CHECK(glGetAttribLocation(data->shader_program, "av4position"));
data->attr_color = GL_CHECK(glGetAttribLocation(data->shader_program, "av3color"));
/* Get uniform locations */
data->attr_mvp = GL_CHECK(glGetUniformLocation(data->shader_program, "mvp"));
GL_CHECK(glUseProgram(data->shader_program));
/* Enable attributes for position, color and texture coordinates etc. */
GL_CHECK(glEnableVertexAttribArray(data->attr_position));
GL_CHECK(glEnableVertexAttribArray(data->attr_color));
/* Populate attributes for position, color and texture coordinates etc. */
GL_CHECK(glVertexAttribPointer(data->attr_position, 3, GL_FLOAT, GL_FALSE, 0, _vertices));
GL_CHECK(glVertexAttribPointer(data->attr_color, 3, GL_FLOAT, GL_FALSE, 0, _colors));
GL_CHECK(glEnable(GL_CULL_FACE));
GL_CHECK(glEnable(GL_DEPTH_TEST));
}
/* Main render loop */
frames = 0;
then = SDL_GetTicks();
done = 0;
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (!done) {
loop();
}
#endif
/* Print out some timing information */
now = SDL_GetTicks();
if (now > then) {
SDL_Log("%2.2f frames per second\n",
((double) frames * 1000) / (now - then));
}
#if !defined(__ANDROID__) && !defined(__NACL__)
quit(0);
#endif
return 0;
}
