Enabled text overlay, code cleanup, refactoring, gl_PerVertex output for shaders

data/shaders/offscreen/mirror.vert

@@ -16,6 +16,11 @@ layout (binding = 0) uniform UBO
 layout (location = 0) out vec2 outUV;
 layout (location = 1) out vec4 outPos;
 
+out gl_PerVertex
+{
+	vec4 gl_Position;
+};
+
 void main() 
 {
 	outUV = inUV;

data/shaders/offscreen/offscreen.vert

@@ -19,6 +19,11 @@ layout (location = 1) out vec3 outColor;
 layout (location = 2) out vec3 outEyePos;
 layout (location = 3) out vec3 outLightVec;
 
+out gl_PerVertex
+{
+	vec4 gl_Position;
+};
+
 void main() 
 {
 	outNormal = inNormal;

data/shaders/offscreen/quad.vert

@@ -14,6 +14,11 @@ layout (binding = 0) uniform UBO
 
 layout (location = 0) out vec2 outUV;
 
+out gl_PerVertex
+{
+	vec4 gl_Position;
+};
+
 void main() 
 {
 	outUV = inUV;