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fbo.cc
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fbo.cc
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#include "fbo.h"
#include "system-gl.h"
#include <cstdio>
#include <iostream>
using namespace std;
fbo_t *fbo_new()
{
auto fbo = new fbo_t;
fbo->fbo_id = 0;
fbo->old_fbo_id = 0;
fbo->renderbuf_id = 0;
fbo->depthbuf_id = 0;
return fbo;
}
bool use_ext()
{
// do we need to use the EXT or ARB version?
if (!hasGLExtension(GL_ARB_framebuffer_object) && hasGLExtension(GL_EXT_framebuffer_object)) {
return true;
} else {
return false;
}
}
bool check_fbo_status()
{
/* This code is based on user V-man code from
http://www.opengl.org/wiki/GL_EXT_framebuffer_multisample
See also: http://www.songho.ca/opengl/gl_fbo.html */
GLenum status;
auto result = false;
if (use_ext()) {
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
} else {
status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
}
if (report_glerror("checking framebuffer status")) return false;
if (status == GL_FRAMEBUFFER_COMPLETE) {
result = true;
} else if (status == GL_FRAMEBUFFER_UNSUPPORTED) {
cerr << "GL_FRAMEBUFFER_UNSUPPORTED\n";
} else if (status == GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT) {
cerr << "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT\n";
} else if (status == GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT) {
cerr << "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT\n";
} else if (status == GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT) {
cerr << "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT\n";
} else if (status == GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT) {
cerr << "GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT\n";
} else if (status == GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT) {
cerr << "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT\n";
} else if (status == GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT) {
cerr << "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT\n";
} else if (status == GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT) {
cerr << "GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT\n";
} else {
cerr << "Unknown Code: glCheckFramebufferStatusEXT returned:" << status << "\n";
}
return result;
}
bool fbo_ext_init(fbo_t *fbo, size_t width, size_t height)
{
// Generate and bind FBO
glGenFramebuffersEXT(1, &fbo->fbo_id);
if (report_glerror("glGenFramebuffersEXT")) return false;
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo->fbo_id);
if (report_glerror("glBindFramebufferEXT")) return false;
// Generate depth and render buffers
glGenRenderbuffersEXT(1, &fbo->depthbuf_id);
glGenRenderbuffersEXT(1, &fbo->renderbuf_id);
// Create buffers with correct size
if (!fbo_resize(fbo, width, height)) return false;
// Attach render and depth buffers
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_RENDERBUFFER_EXT, fbo->renderbuf_id);
if (report_glerror("specifying color render buffer EXT")) return false;
if (!check_fbo_status()) {
cerr << "Problem with OpenGL EXT framebuffer after specifying color render buffer.\n";
return false;
}
if (hasGLExtension(GL_EXT_packed_depth_stencil)) {
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
if (report_glerror("specifying depth render buffer EXT")) return false;
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
if (report_glerror("specifying stencil render buffer EXT")) return false;
if (!check_fbo_status()) {
cerr << "Problem with OpenGL EXT framebuffer after specifying depth render buffer.\n";
return false;
}
} else {
cerr << "Warning: Cannot create stencil buffer (GL_EXT_packed_depth_stencil not supported)\n";
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
GL_RENDERBUFFER_EXT, fbo->depthbuf_id);
if (report_glerror("specifying depth render buffer EXT")) return false;
if (!check_fbo_status()) {
cerr << "Problem with OpenGL EXT framebuffer after specifying depth stencil render buffer.\n";
return false;
}
}
return true;
}
bool fbo_arb_init(fbo_t *fbo, size_t width, size_t height)
{
// Generate and bind FBO
glGenFramebuffers(1, &fbo->fbo_id);
if (report_glerror("glGenFramebuffers")) return false;
glBindFramebuffer(GL_FRAMEBUFFER, fbo->fbo_id);
if (report_glerror("glBindFramebuffer")) return false;
// Generate depth and render buffers
glGenRenderbuffers(1, &fbo->depthbuf_id);
glGenRenderbuffers(1, &fbo->renderbuf_id);
// Create buffers with correct size
if (!fbo_resize(fbo, width, height)) return false;
// Attach render and depth buffers
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, fbo->renderbuf_id);
if (report_glerror("specifying color render buffer")) return false;
if (!check_fbo_status()) {
cerr << "Problem with OpenGL framebuffer after specifying color render buffer.\n";
return false;
}
//glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
// to prevent Mesa's software renderer from crashing, do this in two stages.
// ie. instead of using GL_DEPTH_STENCIL_ATTACHMENT, do DEPTH then STENCIL.
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, fbo->depthbuf_id);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, fbo->depthbuf_id);
if (report_glerror("specifying depth stencil render buffer")) return false;
if (!check_fbo_status()) {
cerr << "Problem with OpenGL framebuffer after specifying depth render buffer.\n";
return false;
}
return true;
}
bool fbo_init(fbo_t *fbo, size_t width, size_t height)
{
/*
Some OpenGL drivers include the framebuffer functions but not with
core or ARB names, only with the EXT name. This has been worked-around
by deciding at runtime, using GLEW, which version needs to be used. See also:
http://www.opengl.org/wiki/Framebuffer_Object
http://stackoverflow.com/questions/6912988/glgenframebuffers-or-glgenframebuffersex
http://www.devmaster.net/forums/showthread.php?t=10967
*/
auto result = false;
if (hasGLExtension(GL_ARB_framebuffer_object)) {
result = fbo_arb_init(fbo, width, height);
} else if (use_ext()) {
result = fbo_ext_init(fbo, width, height);
} else {
cerr << "Framebuffer Object extension not found by GLEW\n";
}
return result;
}
bool fbo_resize(fbo_t *fbo, size_t width, size_t height)
{
if (use_ext()) {
glBindRenderbufferEXT(GL_RENDERBUFFER, fbo->depthbuf_id);
if (hasGLExtension(GL_EXT_packed_depth_stencil)) {
glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
if (report_glerror("creating EXT depth stencil render buffer")) return false;
} else {
glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
if (report_glerror("creating EXT depth render buffer")) return false;
}
glBindRenderbufferEXT(GL_RENDERBUFFER, fbo->renderbuf_id);
glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_RGBA8, width, height);
if (report_glerror("creating EXT color render buffer")) return false;
} else {
glBindRenderbuffer(GL_RENDERBUFFER, fbo->renderbuf_id);
glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, width, height);
if (report_glerror("creating color render buffer")) return false;
glBindRenderbuffer(GL_RENDERBUFFER, fbo->depthbuf_id);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
if (report_glerror("creating depth stencil render buffer")) return false;
}
return true;
}
void fbo_delete(fbo_t *fbo)
{
delete fbo;
}
GLuint fbo_bind(fbo_t *fbo)
{
glGetIntegerv(GL_FRAMEBUFFER_BINDING, reinterpret_cast<GLint *>(&fbo->old_fbo_id));
if (use_ext()) {
glBindFramebufferEXT(GL_FRAMEBUFFER, fbo->fbo_id);
} else {
glBindFramebuffer(GL_FRAMEBUFFER, fbo->fbo_id);
}
return fbo->old_fbo_id;
}
void fbo_unbind(fbo_t *fbo)
{
if (use_ext()) {
glBindFramebufferEXT(GL_FRAMEBUFFER, fbo->old_fbo_id);
} else {
glBindFramebuffer(GL_FRAMEBUFFER, fbo->old_fbo_id);
}
}