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#include "fbo.h"
#include "renderer.h"
#include "../util/util.h"
#include <string.h>
#include <stdlib.h>
Fbo *fbo_new(const char *name, GLint width, GLint height)
{
Fbo *fbo;
if(strlen(name) >= MAX_PATH_LENGTH)
Util_FatalError("Fbo name is too long: %s\n", name);
if(render.num_fbos >= MAX_FBOS)
return NULL;
fbo = malloc(sizeof(Fbo));
memset(fbo, 0, sizeof(Fbo));
glGenFramebuffers(1, &fbo->frame_buffer);
return fbo;
}
void fbo_attach_buffer(Fbo *fbo, GLenum format, int index)
{
GLenum attachment;
GLuint *buffer;
switch(format)
{
case GL_RGB:
case GL_RGBA:
fbo->color_format = format;
buffer = &fbo->color_buffer[index];
attachment = GL_COLOR_ATTACHMENT0 + index;
break;
case GL_DEPTH_COMPONENT:
fbo->depth_format = format;
buffer = &fbo->depth_buffer;
attachment = GL_DEPTH_ATTACHMENT;
break;
default:
Util_FatalError("Invalid fbo buffer format\n");
}
if(*buffer == 0)
{
glGenRenderbuffers(1, buffer);
glBindRenderbuffer(GL_RENDERBUFFER, *buffer);
glRenderbufferStorage(GL_RENDERBUFFER, format, fbo->width, fbo->height);
fbo_bind(fbo);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, attachment, GL_RENDERBUFFER, *buffer);
fbo_bind(NULL);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
}
}
void fbo_attach_texture(Fbo *fbo, Texture *t, GLenum attachment)
{
int index;
fbo_bind(fbo);
if(attachment >= GL_COLOR_ATTACHMENT0 && attachment < GL_COLOR_ATTACHMENT0 + 8)
{
glFramebufferTexture(GL_FRAMEBUFFER, attachment, t->tex_id, 0);
glDrawBuffers(1, &attachment);
index = attachment - GL_COLOR_ATTACHMENT0;
fbo->color_textures[index] = t;
}
fbo_bind(NULL);
}
void fbo_bind(Fbo *fbo)
{
if(fbo)
{
glBindFramebuffer(GL_FRAMEBUFFER, fbo->frame_buffer);
glViewport(0, 0, fbo->width, fbo->height);
}
else
{
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glViewport(0, 0, render.window->Width, render.window->Height);
}
}
void fbo_purge(Fbo *fbo)
{
int i;
for(i = 0; i < 8; i++)
if(fbo->color_buffer[i])
{
glDeleteRenderbuffers(1, &fbo->color_buffer[i]);
}
if(fbo->depth_buffer)
glDeleteRenderbuffers(1, &fbo->depth_buffer);
if(fbo->frame_buffer)
glDeleteFramebuffers(1, &fbo->frame_buffer);
}
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