+++ /dev/null
-/*
- c3gl_fbo.c
-
- Copyright 2008-2012 Michel Pollet <buserror@gmail.com>
-
- This file is part of libc3.
-
- simavr 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.
-
- simavr 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.
-
- You should have received a copy of the GNU General Public License
- along with simavr. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#if __APPLE__
-#define GL_GLEXT_PROTOTYPES
-#include <GLUT/glut.h>
-#include <OpenGL/gl.h>
-#include <OpenGL/glext.h>
-#else
-#define GL_GLEXT_PROTOTYPES
-#include <GL/gl.h>
-#include <GL/glut.h>
-#include <GL/glext.h>
-#endif
-#include <stdio.h>
-#include <string.h>
-
-#include "c3gl_fbo.h"
-
-
-#define GLCHECK(_w) {_w; dumpError(#_w);}
-static int dumpError(const char * what)
-{
- GLenum e;
- int count = 0;
- while ((e = glGetError()) != GL_NO_ERROR) {
- printf("%s: %s\n", what, gluErrorString(e));
- count++;
- }
- return count;
-}
-
-int
-c3gl_fbo_create(
- c3gl_fbo_p b,
- c3vec2 size,
- uint32_t flags )
-{
- memset(b, 0, sizeof(*b));
- b->size = size;
- b->flags = flags;
-
- /* Texture */
- GLCHECK(glActiveTexture(GL_TEXTURE0));
-
- if (b->flags & (1 << C3GL_FBO_COLOR)) {
- GLuint tex;
- glGenTextures(1, &tex);
- glBindTexture(GL_TEXTURE_2D, tex);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
- b->size.x, b->size.y, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- glBindTexture(GL_TEXTURE_2D, 0);
- b->buffers[C3GL_FBO_COLOR].bid = (c3apiobject_t)tex;
- }
-
- /* Depth buffer */
- if (b->flags & (1 << C3GL_FBO_DEPTH)) {
- GLuint rbo_depth;
- GLCHECK(glGenRenderbuffers(1, &rbo_depth));
- glBindRenderbuffer(GL_RENDERBUFFER, rbo_depth);
- GLCHECK(glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
- b->size.x, b->size.y));
- glBindRenderbuffer(GL_RENDERBUFFER, 0);
- b->buffers[C3GL_FBO_DEPTH].bid = (c3apiobject_t)rbo_depth;
- }
-
- if (b->flags & (1 << C3GL_FBO_DEPTH_TEX)) {
- GLuint depthTextureId;
- glGenTextures(1, &depthTextureId);
- glBindTexture(GL_TEXTURE_2D, depthTextureId);
-
- // GL_LINEAR does not make sense for depth texture. However, next tutorial shows usage of GL_LINEAR and PCF. Using GL_NEAREST
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-
- // Remove artefact on the edges of the shadowmap
- glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP );
- glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP );
-
- // This is to allow usage of shadow2DProj function in the shader
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
- glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_INTENSITY);
-
- // No need to force GL_DEPTH_COMPONENT24, drivers usually give you the max precision if available
- glTexImage2D( GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
- b->size.x, b->size.y,
- 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
- glBindTexture(GL_TEXTURE_2D, 0);
- b->buffers[C3GL_FBO_DEPTH_TEX].bid = (c3apiobject_t)depthTextureId;
- }
-
- /* Framebuffer to link everything together */
- GLuint fbo;
- GLCHECK(glGenFramebuffers(1, &fbo));
- glBindFramebuffer(GL_FRAMEBUFFER, fbo);
-
- if (b->flags & (1 << C3GL_FBO_COLOR)) {
- glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
- GL_TEXTURE_2D, (GLuint)b->buffers[C3GL_FBO_COLOR].bid, 0);
- // Set the list of draw buffers.
- GLenum DrawBuffers[2] = { GL_COLOR_ATTACHMENT0 };
- glDrawBuffers(1, DrawBuffers); // "1" is the size of DrawBuffers
- } else {
- glDrawBuffers(0, NULL); // "1" is the size of DrawBuffers
- glDrawBuffer(GL_NONE);
- glReadBuffer(GL_NONE);
- }
-
- if (b->flags & (1 << C3GL_FBO_DEPTH))
- glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
- GL_RENDERBUFFER, (GLuint)b->buffers[C3GL_FBO_DEPTH].bid);
-
- if (b->flags & (1 << C3GL_FBO_DEPTH_TEX))
- // attach the texture to FBO depth attachment point
- glFramebufferTexture2D(GL_FRAMEBUFFER_EXT,
- GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,
- (GLuint)b->buffers[C3GL_FBO_DEPTH_TEX].bid, 0);
-
- b->fbo = (c3apiobject_t)fbo;
-
- GLenum status;
- if ((status = glCheckFramebufferStatus(GL_FRAMEBUFFER))
- != GL_FRAMEBUFFER_COMPLETE) {
- fprintf(stderr, "%s: glCheckFramebufferStatus: error %d", __func__, (int)status);
- return -1 ;
- }
-
- glBindFramebuffer(GL_FRAMEBUFFER, 0);
- return 0;
-}
-
-void
-c3gl_fbo_resize(
- c3gl_fbo_p b,
- c3vec2 size)
-{
- b->size = size;
-// Rescale FBO and RBO as well
- if (b->flags & (1 << C3GL_FBO_COLOR)) {
- glBindTexture(GL_TEXTURE_2D, (GLuint)b->buffers[C3GL_FBO_COLOR].bid);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
- b->size.x, b->size.y, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- glBindTexture(GL_TEXTURE_2D, 0);
- }
-
- if (b->flags & (1 << C3GL_FBO_DEPTH)) {
- glBindRenderbuffer(GL_RENDERBUFFER, (GLuint)b->buffers[C3GL_FBO_DEPTH].bid);
- glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
- b->size.x, b->size.y);
- glBindRenderbuffer(GL_RENDERBUFFER, 0);
- }
-}
-
-void
-c3gl_fbo_dispose(
- c3gl_fbo_p b )
-{
- /* free_resources */
- if (b->flags & (1 << C3GL_FBO_DEPTH)) {
- GLuint bid = (GLuint)b->buffers[C3GL_FBO_DEPTH].bid;
- glDeleteRenderbuffers(1, &bid);
- }
- if (b->flags & (1 << C3GL_FBO_COLOR)) {
- GLuint bid = (GLuint)b->buffers[C3GL_FBO_COLOR].bid;
- glDeleteTextures(1, &bid);
- }
- GLuint fbo = (GLuint)b->fbo;
- glDeleteFramebuffers(1, &fbo);
- memset(b, 0, sizeof(*b));
-}
-
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