OpenGL: Framebuffer, incomplete texture attachment - c++

Question

I've searched for couple hours for a solution to my problem.
First of all. I have HD 7800 series amd GPU, newest drivers.
I'm trying to create framebuffer class which has all the framebuffer functions I will need. It seems I got renderbuffers to work, but drawing to texture is causing really weird errors.
FrameBuffer::FrameBuffer(int width, int height)
{
createFrameBuffer();
// createDepthBufferAttachment(width, height); //commented out for testing (THIS WORKS)
createTextureAttachment(width, height);
// createDepthTextureAttachment(width, height); //commented out for testing
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
std::cerr << glCheckFramebufferStatus(GL_FRAMEBUFFER) << "\nFramebuffer failed to generate! 0\n";
}
unbindFrameBuffer();
}
FrameBuffer::~FrameBuffer()
{
if (fbo != NULL)
glDeleteFramebuffers(1, &fbo);
if (colorTexture != NULL)
glDeleteTextures(1, &colorTexture);
if (depthBuffer != NULL)
glDeleteRenderbuffers(1, &depthBuffer);
if (depthTexture != NULL)
glDeleteTextures(1, &depthTexture);
}
void FrameBuffer::createFrameBuffer(){
glGenFramebuffers(1, &fbo);
}
void FrameBuffer::createTextureAttachment(int width, int height){
glGenTextures(1, &colorTexture);
glBindTexture(GL_TEXTURE_2D, colorTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, GL_RGBA, 0, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorTexture, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
std::cerr << glCheckFramebufferStatus(GL_FRAMEBUFFER) << "\nFramebuffer failed to generate! 1\n";
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBuffer::createDepthTextureAttachment(int width, int height){
glGenTextures(1, &depthTexture);
glBindTexture(GL_TEXTURE_2D, depthTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32, width, height, GL_DEPTH_COMPONENT, 0, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthTexture, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
std::cerr << glCheckFramebufferStatus(GL_FRAMEBUFFER) << "\nFramebuffer failed to generate! 2\n";
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBuffer::createDepthBufferAttachment(int width, int height){
glGenRenderbuffers(1, &depthBuffer);
glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuffer);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
std::cerr << glCheckFramebufferStatus(GL_FRAMEBUFFER) << "\nFramebuffer failed to generate! 3\n";
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBuffer::bindFrameBuffer( int width, int height){
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glViewport(0, 0, width, height);
}
void FrameBuffer::unbindFrameBuffer(){
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glViewport(0, 0, DisplayManager::getWidth(), DisplayManager::getHeight());
}
glCheckFrameBufferStatus returns GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT
at both checks. The same happens with the createDepthTextureAttachment()
Neither one seems to not work
createDepthBufferAttachment() works fine.
More info:
Yes, indeed I'm actually giving width and height to the function, they are both 1024.
I've tried changing the GL_RGBA to GL_RGB, and Tried different sizes of GL_DEPTH_COMPONENT too.
At the moment I'm intending on using only 1 texture, not all 3 functions.
I don't know if it matters but SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32); is set.
I've also tried glFramebufferTexture() function instead.
Thank you in advance!

Answer 1

The order of arguments in your glTexImage2D() calls is wrong. Looking at the first one:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, GL_RGBA, 0, GL_UNSIGNED_BYTE, NULL);
Comparing that to the function definition:
void glTexImage2D(
GLenum target,
GLint level,
GLint internalFormat,
GLsizei width,
GLsizei height,
GLint border,
GLenum format,
GLenum type,
const GLvoid* data);
you can see that the 6th argument is the border width, and the 7th is the format. You have those two inverted. The call should be:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
The same thing applies to the other call.
Anytime you have problems getting your OpenGL code working, I strongly recommend to call glGetError(). It would quickly tell you that there are errors from these calls.