Clean-up base voxelization fragment shader.

Author: Adnn

src/apps/ch11_voxel/ch11_voxel/Voxelization.cpp

@@ -278,7 +278,6 @@ void Voxelizer::voxelize(const scenic::SceneTree & aScene, GLuint aGridDimension
     glViewport(0, 0, aGridDimension, aGridDimension);
 
     const auto & program = aGraph.mPrograms.mVoxelizationProgram;
-    graphics::setUniform(program, "u_AabbDepth", maxSide);
 
     GLuint query;
     glGenQueries(1, &query);

src/apps/ch11_voxel/ch11_voxel/resources/shaders/ch11_Voxelization.frag

@@ -6,13 +6,11 @@
 
 in vec3 ex_Position_view;
 
-uniform float u_AabbDepth;
-
 
 void main(void)
 {
 	// TODO: interpolate the arithmetic in floor() from the vertex shader
-	uint z = uint(floor(-ex_Position_view.z * ub_GridDimension / u_AabbDepth));
+	uint z = uint(gl_FragCoord.z * ub_GridDimension);
 	ivec3 voxel = ivec3( ivec2(gl_FragCoord.xy),
 				         max(0, (ub_GridDimension - 1) - z) );