Small raytracing shader performance changes

data/shaders/raytracing/raytracing.comp

@@ -5,8 +5,8 @@
 #extension GL_ARB_separate_shader_objects : enable
 #extension GL_ARB_shading_language_420pack : enable
 
-layout (local_size_x =16, local_size_y = 16) in;
-layout (binding = 0, rgba8) uniform image2D resultImage;
+layout (local_size_x = 16, local_size_y = 16) in;
+layout (binding = 0, rgba8) uniform writeonly image2D resultImage;
 
 #define EPSILON 0.0001
 #define MAXLEN 1000.0
@@ -113,6 +113,7 @@ int intersect(in vec3 rayO, in vec3 rayD, out float resT)
 		{
 			id = spheres[i].id;
 			resT = tSphere;
+			return id;
 			break;
 		}
 	}	
@@ -153,6 +154,11 @@ vec3 renderScene(inout vec3 rayO, inout vec3 rayD, inout int id)
 	// Get intersected object ID
 	int objectID = intersect(rayO, rayD, t);
 	
+	if (objectID == -1)
+	{
+		return color;
+	}
+	
 	vec3 pos = rayO + t * rayD;
 	vec3 lightVec = normalize(ubo.lightPos - pos);				
 	vec3 normal;

raytracing/raytracing.cpp

@@ -52,7 +52,7 @@ public:
 		glm::vec3 lightPos;
 		// Aspect ratio of the viewport
 		float aspectRatio;
-		glm::vec4 fogColor = glm::vec4(0.025f, 0.025f, 0.025f, 0.0f);
+		glm::vec4 fogColor = glm::vec4(0.0f);
 		struct {
 			glm::vec3 pos = glm::vec3(0.0f, 1.5f, 4.0f);
 			glm::vec3 lookat = glm::vec3(0.0f, 0.5f, 0.0f);