Resolve "Indirect Dispatch"

Closes #106 (closed)

projects/indirect_dispatch/resources/shaders/gammaCorrection.comp

@@ -9,14 +9,18 @@ layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
 
 void main(){
 
-    if(any(greaterThanEqual(gl_GlobalInvocationID.xy, imageSize(outImage))))
+    ivec2 outImageRes = imageSize(outImage);
+    ivec2 coord       = ivec2(gl_GlobalInvocationID.xy);
+
+    if(any(greaterThanEqual(coord, outImageRes)))
         return;
    
-    ivec2   textureRes  = textureSize(sampler2D(inTexture, textureSampler), 0);
-    ivec2   coord       = ivec2(gl_GlobalInvocationID.xy);
-    vec2    uv          = vec2(coord) / textureRes;
-
+    vec2 uv             = vec2(coord) / outImageRes;
     vec3 linearColor    = texture(sampler2D(inTexture, textureSampler), uv).rgb;
+    
+    // in case of motion vector visualisation negative values are possible
+    linearColor         = abs(linearColor); 
+    
     vec3 gammaCorrected = pow(linearColor, vec3(1 / 2.2));
 
     imageStore(outImage, coord, vec4(gammaCorrected, 0.f));