Added screenshot taking example

CMakeLists.txt

@@ -122,6 +122,7 @@ set(EXAMPLES
 	radialblur
 	raytracing
 	scenerendering
+	screenshot
 	shadowmapping
 	shadowmappingomni
 	skeletalanimation

data/shaders/screenshot/mesh.frag

@@ -0,0 +1,23 @@
+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) in vec3 inNormal;
+layout (location = 1) in vec3 inColor;
+layout (location = 2) in vec3 inViewVec;
+layout (location = 3) in vec3 inLightVec;
+
+layout (location = 0) out vec4 outFragColor;
+
+void main() 
+{
+	vec3 N = normalize(inNormal);
+	vec3 L = normalize(inLightVec);
+	vec3 V = normalize(inViewVec);
+	vec3 R = reflect(-L, N);
+	vec3 ambient = vec3(0.1);
+	vec3 diffuse = max(dot(N, L), 0.0) * vec3(1.0);
+	vec3 specular = pow(max(dot(R, V), 0.0), 16.0) * vec3(0.75);
+	outFragColor = vec4((ambient + diffuse) * inColor.rgb + specular, 1.0);		
+}

data/shaders/screenshot/mesh.vert

@@ -0,0 +1,39 @@
+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) in vec4 inPos;
+layout (location = 1) in vec3 inNormal;
+layout (location = 2) in vec3 inColor;
+
+layout (set = 0, binding = 0) uniform UBO 
+{
+	mat4 projection;
+	mat4 view;
+	mat4 model;
+} ubo;
+
+layout (location = 0) out vec3 outNormal;
+layout (location = 1) out vec3 outColor;
+layout (location = 2) out vec3 outViewVec;
+layout (location = 3) out vec3 outLightVec;
+
+out gl_PerVertex
+{
+	vec4 gl_Position;
+};
+
+void main() 
+{
+	outNormal = inNormal;
+	outColor = inColor;
+	gl_Position = ubo.projection * ubo.view * ubo.model * inPos;
+
+	vec4 pos = ubo.view * ubo.model * vec4(inPos.xyz, 1.0);
+	outNormal = mat3(ubo.model) * inNormal;
+
+	vec3 lightPos = vec3(1.0f, -1.0f, 1.0f);
+	outLightVec = lightPos.xyz - pos.xyz;
+	outViewVec = -pos.xyz;		
+}