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    <p>They are several. The usual one is to check is the current's coordinates (gl_FragCoord) are (0.5, 0.5). If it is, it means that you're in the middle of a polygon : it's sampled only once.</p> <p>It it's not, it's probably one of the 4 (for 4xMSAA) rotated-square-corners : You're on an edge, and openGL has detected that one sample only isn't enough.</p> <p>See also <a href="http://www.opengl.org/pipeline/article/vol003_6/" rel="nofollow noreferrer">http://www.opengl.org/pipeline/article/vol003_6/</a></p> <p>In order to have this information in a second pass, you'll have to store it in a g-buffer, though.</p> <p>EDIT : Here is a code snippet that I've just done. Tested on gtx 470 with a 1024x1024 4xMSAA texture.</p> <p>Vertex shader : </p> <pre><code> #version 400 core uniform mat4 MVP; noperspective centroid out vec2 posCentroid; layout(location = 0) in vec4 Position; void main(){ gl_Position = MVP * Position; posCentroid = (gl_Position.xy / gl_Position.w)*512; // there is a factor two compared to 1024 because normalized coordinates have range [-1,1], not [0,1] } </code></pre> <p>Fragment shader : </p> <pre><code>#version 400 core out vec4 color; noperspective centroid in vec2 posCentroid; void main() { if (abs(fract(posCentroid.x) - 0.5) &lt; 0.01 &amp;&amp; abs(fract(posCentroid.y) - 0.5) &lt; 0.01){ color = vec4(1,0,0,0); }else{ color = vec4(0,1,0,0); } } </code></pre> <p>Edges are green, center of polygon is red.</p> <p>For your original question, I recommend you this article : <a href="http://www.gamasutra.com/view/feature/3591/resolve_your_resolves.php" rel="nofollow noreferrer">http://www.gamasutra.com/view/feature/3591/resolve_your_resolves.php</a></p>
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    1. POHow to detect in glsl if fragment is multisampled?
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    1. POHow to detect in glsl if fragment is multisampled?
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    1. COgl_FragCoord is position [0,screen_size]. I've tried to detect relative position by this code (vec2 a = gl_FragCoord.xy - floor(gl_FragCoord.xy); if(a.x != 0.5 && a.y != 0.5) gl_FragColor = vec4(1,0,0,1); else { gl_FragColor= vec4(0,1,0,1); }), but it haven't work
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    2. COThat's normal. You have to use a centroid varying (gl_FragCoord is not centroid). I have to check this out, I'll get back to you when I know how to do it.
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    3. CO@Miro http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=277450 So something like : VS -> out centroid fragcoord; main(){fragcoord = MVP *in_Position; fragcoord.xy/=fragcoord.w;} and FS -> what you did but with fragcoord
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