I am trying to create a render target for my game so that I can re-render at a different screen size. But I am receiving the following error:
Exception in thread "main" org.lwjgl.opengl.OpenGLException: Cannot use offsets when Pixel Unpack Buffer Object is disabled
Here is the source code for my Render method:
// clear screen
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
// Start FBO Rendering Code
// The framebuffer, which regroups 0, 1, or more textures, and 0 or 1 depth buffer.
int FramebufferName = GL30.glGenFramebuffers();
GL30.glBindFramebuffer(GL30.GL_FRAMEBUFFER, FramebufferName);
// The texture we're going to render to
int renderedTexture = glGenTextures();
// "Bind" the newly created texture : all future texture functions will modify this texture
glBindTexture(GL_TEXTURE_2D, renderedTexture);
// Give an empty image to OpenGL ( the last "0" )
glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, 1024, 768, 0,GL_RGB, GL_UNSIGNED_BYTE, 0);
// Poor filtering. Needed !
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
// Set "renderedTexture" as our colour attachement #0
GL32.glFramebufferTexture(GL30.GL_FRAMEBUFFER, GL30.GL_COLOR_ATTACHMENT0, renderedTexture, 0);
// Set the list of draw buffers.
IntBuffer drawBuffer = BufferUtils.createIntBuffer(20 * 20);
GL20.glDrawBuffers(drawBuffer);
// Always check that our framebuffer is ok
if(GL30.glCheckFramebufferStatus(GL30.GL_FRAMEBUFFER) != GL30.GL_FRAMEBUFFER_COMPLETE){
System.out.println("Framebuffer was not created successfully! Exiting!");
return;
}
// Resets the current viewport
GL11.glViewport(0, 0, scaleWidth*scale, scaleHeight*scale);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glLoadIdentity();
// let subsystem paint
if (callback != null) {
callback.frameRendering();
}
// update window contents
Display.update();
It is crashing on this line:
glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, 1024, 768, 0,GL_RGB, GL_UNSIGNED_BYTE, 0);
I am not really sure why it is crashing and looking around I have not been able to find out why. Any help or insight would be greatly welcome.
