Resolve "Indirect Dispatch"

Closes #106 (closed)

projects/indirect_dispatch/resources/shaders/motionBlur.comp

 #version 440
 #extension GL_GOOGLE_include_directive : enable
+
 #include "motionBlurConfig.inc"
+#include "motionBlurWorkTile.inc"
 
 layout(set=0, binding=0)                    uniform texture2D   inColor;
 layout(set=0, binding=1)                    uniform texture2D   inDepth;
@@ -9,7 +11,11 @@ layout(set=0, binding=3)                    uniform texture2D   inMotionNeighbou
 layout(set=0, binding=4)                    uniform sampler     nearestSampler;
 layout(set=0, binding=5, r11f_g11f_b10f)    uniform image2D     outImage;
 
-layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
+layout(set=0, binding=6) buffer copyPathTileBuffer {
+    WorkTiles workTiles;
+};
+
+layout(local_size_x = motionTileSize, local_size_y = motionTileSize, local_size_z = 1) in;
 
 layout( push_constant ) uniform constants{
     // computed from delta time and shutter speed
@@ -127,11 +133,14 @@ float dither(ivec2 coord){
 
 void main(){
 
-    if(any(greaterThanEqual(gl_GlobalInvocationID.xy, imageSize(outImage))))
+    uint    tileIndex       = gl_WorkGroupID.x;
+    ivec2   tileCoordinates = workTiles.tileXY[tileIndex];
+    ivec2   coord           = ivec2(tileCoordinates * motionTileSize + gl_LocalInvocationID.xy);
+
+    if(any(greaterThanEqual(coord, imageSize(outImage))))
         return;
    
     ivec2   textureRes  = textureSize(sampler2D(inColor, nearestSampler), 0);
-    ivec2   coord       = ivec2(gl_GlobalInvocationID.xy);
     vec2    uv          = vec2(coord + 0.5) / textureRes;   // + 0.5 to shift uv into pixel center
     
     // the motion tile lookup is jittered, so the hard edges in the blur are replaced by noise