Resolve "Indirect Dispatch"

Closes #106 (closed)

projects/indirect_dispatch/resources/shaders/motionBlurDummy.comp

@@ -8,6 +8,13 @@ layout(set=0, binding=3, r11f_g11f_b10f)    uniform image2D     outImage;
 
 layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
 
+layout( push_constant ) uniform constants{
+    // computed from delta time and shutter speed
+    float motionFactor;
+    float minVelocity;
+};
+
+
 void main(){
 
     if(any(greaterThanEqual(gl_GlobalInvocationID.xy, imageSize(outImage))))
@@ -18,6 +25,16 @@ void main(){
     vec2    uv          = vec2(coord) / textureRes;
 
     vec2    motion      = texture(sampler2D(inMotion, textureSampler), uv).rg;
+    float   velocity    = length(motion);
+    
+    // early out on little movement
+    if(velocity < minVelocity){
+        vec3 color = texture(sampler2D(inColor, textureSampler), uv).rgb;
+        imageStore(outImage, coord, vec4(color, 0.f));
+        return;
+    }
+    
+    motion              *= motionFactor;
 
     vec3        color       = vec3(0);
     const int   sampleCount = 16;