GLboolean fbo_create(fbo *F, GLsizei w, GLsizei h)
{
if (gli.framebuffer_object == 0) return GL_FALSE;
F->width = w;
F->height = h;
glGenTextures (1, &F->color_texture);
glGenTextures (1, &F->depth_texture);
glGenFramebuffers_(1, &F->framebuffer);
glBindTexture (GL_TEXTURE_2D, F->color_texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0,
GL_RGBA, GL_UNSIGNED_INT, NULL);
glBindTexture (GL_TEXTURE_2D, F->depth_texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D (GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8, w, h, 0,
GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, NULL);
glBindFramebuffer_ (GL_FRAMEBUFFER, F->framebuffer);
glFramebufferTexture2D_(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, F->color_texture, 0);
glFramebufferTexture2D_(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_TEXTURE_2D, F->depth_texture, 0);
glFramebufferTexture2D_(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_TEXTURE_2D, F->depth_texture, 0);
if (glCheckFramebufferStatus_(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE)
{
glBindFramebuffer_(GL_FRAMEBUFFER, 0);
return GL_TRUE;
}
else
{
glBindFramebuffer_(GL_FRAMEBUFFER, 0);
return GL_FALSE;
}
}
int Lua_Framebuffer_new(lua_State *L)
{
Lua_Image *ptr;
unsigned int width, height, percision, alpha;
GLint current_fbo;
GLenum internal, format;
if(!supported.FBO) return 0;
width = luaL_checkinteger(L, 1);
height = luaL_checkinteger(L, 2);
percision = lua_tointeger(L, 3);
alpha = lua_toboolean(L, 4);
if(percision == 32)
{
internal = alpha ? GL_RGBA32F_ARB : GL_RGB32F_ARB;
format = GL_FLOAT;
}
else if(percision == 16)
{
internal = alpha ? GL_RGBA16F_ARB : GL_RGB16F_ARB;
format = GL_FLOAT;
}
else
{
internal = alpha ? GL_RGBA : GL_RGB;
format = GL_UNSIGNED_BYTE;
}
//save current fbo
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING_EXT, ¤t_fbo);
ptr = lua_newuserdata(L, sizeof(Lua_Image));
ptr->w = width;
ptr->h = height;
// generate texture save target
glGenTextures(1, &ptr->texture);
glBindTexture(GL_TEXTURE_2D, ptr->texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
//~ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
//~ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexImage2D(GL_TEXTURE_2D,0,internal,width,height,0,GL_RGBA,format,0);
glBindTexture(GL_TEXTURE_2D, 0);
// create framebuffer
glGenFramebuffers_(1, &ptr->fbo);
glBindFramebuffer_(GL_FRAMEBUFFER_EXT, ptr->fbo);
glFramebufferTexture2D_(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, ptr->texture, 0);
checkFramebufferStatus();
// unbind framebuffer
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, (GLuint)current_fbo);
luaL_getmetatable(L, "scrupp.image");
lua_setmetatable(L, -2);
return 1;
}
