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/*
* This file is part of NumptyPhysics <http://thp.io/2015/numptyphysics/>
* Coyright (c) 2014 Thomas Perl <m@thp.io>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include "glaserl_framebuffer.h"
#include <stdio.h>
#include <stdlib.h>
glaserl_framebuffer_t *
glaserl_framebuffer_new(int width, int height)
{
glaserl_framebuffer_t *framebuffer = (glaserl_framebuffer_t *)calloc(sizeof(glaserl_framebuffer_t), 1);
framebuffer->width = width;
framebuffer->height = height;
glGenFramebuffers(1, &framebuffer->id);
return framebuffer;
}
void
glaserl_framebuffer_attach(glaserl_framebuffer_t *framebuffer,
glaserl_texture_t *texture)
{
glaserl_framebuffer_enable(framebuffer);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, texture->id, 0);
glaserl_framebuffer_disable(framebuffer);
}
void
glaserl_framebuffer_enable(glaserl_framebuffer_t *framebuffer)
{
GLint current = 0;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, ¤t);
if (current != framebuffer->id) {
framebuffer->old_framebuffer = current;
glGetIntegerv(GL_VIEWPORT, framebuffer->old_viewport);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer->id);
glViewport(0, 0, framebuffer->width, framebuffer->height);
}
}
void
glaserl_framebuffer_disable(glaserl_framebuffer_t *framebuffer)
{
GLint current = 0;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, ¤t);
if (current == framebuffer->id) {
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer->old_framebuffer);
glViewport(framebuffer->old_viewport[0], framebuffer->old_viewport[1],
framebuffer->old_viewport[2], framebuffer->old_viewport[3]);
}
}
void
glaserl_framebuffer_destroy(glaserl_framebuffer_t *framebuffer)
{
glDeleteFramebuffers(1, &framebuffer->id);
free(framebuffer);
}
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