Added space background sphere using a secondary command buffer

data/shaders/multithreading/generate-spirv.bat

@@ -1,2 +1,4 @@
 glslangvalidator -V phong.vert -o phong.vert.spv
-glslangvalidator -V phong.frag -o phong.frag.spv
+glslangvalidator -V phong.frag -o phong.frag.spv
+glslangvalidator -V starsphere.vert -o starsphere.vert.spv
+glslangvalidator -V starsphere.frag -o starsphere.frag.spv

data/shaders/multithreading/phong.vert

@@ -21,7 +21,15 @@ layout (location = 4) out vec3 outLightVec;
 void main() 
 {
 	outNormal = inNormal;
-	outColor = inColor;// * pushConsts.color;
+
+	if ( (inColor.r == 1.0) && (inColor.g == 0.0) && (inColor.b == 0.0))
+	{	
+		outColor = pushConsts.color;
+	}
+	else
+	{
+		outColor = inColor;
+	}
 	
 	gl_Position = pushConsts.mvp * vec4(inPos.xyz, 1.0);
 	

data/shaders/multithreading/starsphere.frag

@@ -0,0 +1,42 @@
+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) in vec3 inUVW;
+
+layout (location = 0) out vec4 outFragColor;
+
+#define HASHSCALE3 vec3(443.897, 441.423, 437.195)
+#define STARFREQUENCY 0.01
+
+// Hash function by Dave Hoskins (https://www.shadertoy.com/view/4djSRW)
+float hash33(vec3 p3)
+{
+	p3 = fract(p3 * HASHSCALE3);
+    p3 += dot(p3, p3.yxz+19.19);
+    return fract(vec3((p3.x + p3.y)*p3.z + (p3.x+p3.z)*p3.y + (p3.y+p3.z)*p3.x));
+}
+
+float starField(vec3 pos)
+{
+	vec3 color = vec3(0.0);
+    float threshhold = (1.0 - STARFREQUENCY);
+    float rnd = hash33(pos);
+    if (rnd >= threshhold)
+    {
+        float starCol = pow((rnd - threshhold) / (1.0 - threshhold), 16.0);
+		color += vec3(starCol);
+    }	
+	return color;
+}
+
+void main() 
+{
+	// Fake atmosphere at the bottom
+	vec3 atmosphere = clamp(vec3(0.1, 0.15, 0.4) * (inUVW.t - 5.0), 0.0, 1.0);
+
+	vec3 color = starField(inUVW) + atmosphere;
+	
+	outFragColor = vec4(color, 1.0);
+}

data/shaders/multithreading/starsphere.vert

@@ -0,0 +1,19 @@
+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) in vec3 inPos;
+
+layout (std140, push_constant) uniform PushConsts 
+{
+	mat4 mvp;
+} pushConsts;
+
+layout (location = 0) out vec3 outUVW;
+
+void main() 
+{
+	outUVW = inPos;
+	gl_Position = pushConsts.mvp * vec4(inPos.xyz, 1.0);
+}