So, I'm implementing SSAO as part of my rendering pipeline using OpenGL/GLSL. It works pretty well when I have a camera that takes up the entire screen. However, when my camera is smaller than the full screen size, the SSAO texture doesn't get sampled correctly. Here is the relevant GLSL shader code:
// Convert from clip-space vec2 fragCoords = (fragPos.xy/ fragPos.w); // fragPos is MVP * worldPosition vec2 screenCoords = fragCoords * 0.5 + 0.5; // Convert from [-1, 1] to [0, 1] to sample UV coordinates // Sample texture float ssaoFactor = texture2D(ssaoTexture, screenCoords).r;
I know that there is some funkiness going on with the viewport, but the fixes that I've tried haven't worked. My first thought was to scale fragCoords by normalized size of my viewport (e.g. vec2(0.5, 0.5) for a viewport with half of the width and height of the screen), but that just produced a very strange result. Any thoughts?