Can linear filtering be used for an FBO blit of an MSAA texture to non-MSAA texture?
opengl,textures,framebuffer,blit,msaa
The filtering options only come into play when you sample from the textures. They play no role while you render to the texture. When sampling from multisample textures, GL_NEAREST is indeed the only supported filter option. You also need to use a special sampler type (sampler2DMS) in the GLSL code,...
Why does glDrawBuffer generate a GL_INVALID_OPERATION?
java,opengl,jogl,opengl-3,msaa
I suspect that the error comes from an earlier call. At least there should be numerous errors, for example from the glBindFramebuffer() call immediately preceding the glDrawBuffer() call: gl.glBindFramebuffer(GL3.GL_READ_FRAMEBUFFER, multisampleFbo); checkGLError(); gl.glDrawBuffer(GL3.GL_BACK); // Throws GL_INVALID_OPERATION checkGLError("OpenGL error at glDrawBuffer: 0x%h%n"); multisampleFbo is not a framebuffer object. It was created like...
CheckMultisampleQualityLevels(…) says the card does not support MSAA (which is not true for e.g. my GeForce GTX 780)?
Your code subtracts 1 from maxQualityLevels before checking to see whether it's greater than zero. An initial value of 1 would suggest it's valid to create the target at quality level 0. Assuming you want this to work across vendors you only really need to check for it being >...