Resolve "Voxel cone tracing"

Closes #82 (closed)

projects/voxelization/resources/shaders/shader.frag

@@ -32,6 +32,13 @@ layout(set=0, binding=6) uniform VoxelInfoBuffer{
     VoxelInfo voxelInfo;
 };
 
+layout(set=0, binding=7) uniform VolumetricSettings {
+    vec3    scatteringCoefficient;
+    float   volumetricAmbientLight;
+    vec3    absorptionCoefficient;
+};
+
+
 vec3 cookTorrance(vec3 f0, float r, vec3 N, vec3 V, vec3 L){
     
     vec3 H  = normalize(L + V);
@@ -78,10 +85,7 @@ vec3 volumetricLighting(vec3 colorIn, vec3 V, vec3 pos, float d){
     int sampleCount = 48;
     float stepSize  = d / sampleCount;
     
-    vec3 scatteringCoefficient = vec3(0.005);
-    vec3 absorptionCoefficient = vec3(0.01);
     vec3 extinctionCoefficient = scatteringCoefficient + absorptionCoefficient;
-    vec3 ambientLight          = vec3(0.2);
     
     float noiseScale    = 0.1;
     pos                 += V * noiseScale * interleavedGradientNoise(gl_FragCoord.xy);
@@ -92,7 +96,7 @@ vec3 volumetricLighting(vec3 colorIn, vec3 V, vec3 pos, float d){
         vec3    light       = lightInfo.sunColor * lightInfo.sunStrength;
         float   shadow      = shadowTest(samplePoint, lightInfo, shadowMap, shadowMapSampler, vec2(0));
         light               *= shadow;
-        light               += ambientLight;
+        light               += volumetricAmbientLight;
         
         color               += phase * light * scatteringCoefficient * stepSize;
         color               *= exp(-stepSize * extinctionCoefficient);