shader_program::shader_program(const std::string &vsrc, const std::string &fsrc)
: program_object_(0)
, vertex_object_(0)
, fragment_object_(0)
, block_()
, attr_color_mod_(0)
, attr_submerge_(0)
, attr_effects_(0)
, uni_overlay_(0)
, overlay_image_()
, refcount_(new unsigned(1))
{
vertex_object_ = GPU_LoadShader(GPU_VERTEX_SHADER, vsrc.c_str());
if (!vertex_object_) {
throw shader_error("Failed to compile vertex shader");
}
fragment_object_ = GPU_LoadShader(GPU_FRAGMENT_SHADER, fsrc.c_str());
if (!fragment_object_) {
throw shader_error("Failed to compile fragment shader");
}
program_object_ = GPU_LinkShaders(vertex_object_, fragment_object_);
if (!program_object_) {
throw shader_error("Failed to link shader program");
}
attr_color_mod_ = GPU_GetAttributeLocation(program_object_,
"vert_color_mod");
attr_submerge_ = GPU_GetAttributeLocation(program_object_,
"vert_submerge");
attr_effects_ = GPU_GetAttributeLocation(program_object_,
"vert_effects");
uni_overlay_ = GPU_GetUniformLocation(program_object_, "overlay");
set_color_mod(0, 0, 0, 0);
set_submerge(0);
set_effects(0);
}
int main(int argc, char* argv[])
{
GPU_Target* screen;
GPU_SetDebugLevel(GPU_DEBUG_LEVEL_MAX);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
GPU_SetRequiredFeatures(GPU_FEATURE_BASIC_SHADERS);
screen = GPU_InitRenderer(GPU_RENDERER_OPENGL_3, 800, 600, GPU_DEFAULT_INIT_FLAGS);
if(screen == NULL)
{
GPU_LogError("Initialization Error: Could not create a renderer with proper feature support for this demo.\n");
return 1;
}
glewExperimental = GL_TRUE; // Force GLEW to get exported functions instead of checking via extension string
if(glewInit() != GLEW_OK)
{
GPU_LogError("Initialization Error: Failed to initialize GLEW.\n");
return 2;
}
{
GPU_Image* image;
float dt;
Uint32 startTime;
long frameCount;
int maxSprites = 50;
int numSprites;
float x[50];
float y[50];
float velx[50];
float vely[50];
int i;
Uint8 done;
SDL_Event event;
image = GPU_LoadImage("data/test.bmp");
if (image == NULL)
return 3;
v = GPU_LoadShader(GPU_VERTEX_SHADER, "data/shaders/untextured-150.vert");
f = GPU_LoadShader(GPU_FRAGMENT_SHADER, "data/shaders/untextured-150.frag");
p = GPU_LinkShaders(v, f);
GPU_Log("%s\n", GPU_GetShaderMessage());
glUseProgram(p);
vertex_loc = GPU_GetAttributeLocation(p, "gpu_Vertex");
color_loc = GPU_GetAttributeLocation(p, "gpu_Color");
modelViewProjection_loc = GPU_GetUniformLocation(p, "gpu_ModelViewProjectionMatrix");
glGenVertexArrays(1, &VAO);
glBindVertexArray(VAO);
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
dt = 0.010f;
startTime = SDL_GetTicks();
frameCount = 0;
numSprites = 1;
for (i = 0; i < maxSprites; i++)
{
x[i] = rand() % screen->w;
y[i] = rand() % screen->h;
velx[i] = 10 + rand() % screen->w / 10;
vely[i] = 10 + rand() % screen->h / 10;
}
done = 0;
while (!done)
{
while (SDL_PollEvent(&event))
{
if (event.type == SDL_QUIT)
done = 1;
else if (event.type == SDL_KEYDOWN)
{
if (event.key.keysym.sym == SDLK_ESCAPE)
done = 1;
else if (event.key.keysym.sym == SDLK_EQUALS || event.key.keysym.sym == SDLK_PLUS)
{
if (numSprites < maxSprites)
numSprites++;
}
else if (event.key.keysym.sym == SDLK_MINUS)
{
if (numSprites > 0)
numSprites--;
}
}
}
for (i = 0; i < numSprites; i++)
{
x[i] += velx[i] * dt;
y[i] += vely[i] * dt;
if (x[i] < 0)
{
x[i] = 0;
velx[i] = -velx[i];
}
else if (x[i]> screen->w)
{
x[i] = screen->w;
velx[i] = -velx[i];
}
if (y[i] < 0)
{
y[i] = 0;
vely[i] = -vely[i];
}
else if (y[i]> screen->h)
{
y[i] = screen->h;
vely[i] = -vely[i];
}
}
GPU_Clear(screen);
draw_3d_stuff(screen);
for (i = 0; i < numSprites; i++)
{
GPU_Blit(image, NULL, screen, x[i], y[i]);
}
draw_more_3d_stuff(screen);
GPU_Flip(screen);
frameCount++;
if (frameCount % 500 == 0)
printf("Average FPS: %.2f\n", 1000.0f*frameCount / (SDL_GetTicks() - startTime));
}
printf("Average FPS: %.2f\n", 1000.0f*frameCount / (SDL_GetTicks() - startTime));
GPU_FreeImage(image);
}
GPU_Quit();
return 0;
}
