Use createBuffer function from Vulkan device class

data/shaders/deferred/deferred.vert

@@ -3,15 +3,6 @@
 #extension GL_ARB_separate_shader_objects : enable
 #extension GL_ARB_shading_language_420pack : enable
 
-layout (location = 0) in vec3 inPos;
-layout (location = 1) in vec2 inUV;
-
-layout (binding = 0) uniform UBO 
-{
-	mat4 projection;
-	mat4 model;
-} ubo;
-
 layout (location = 0) out vec2 outUV;
 
 out gl_PerVertex
@@ -21,6 +12,6 @@ out gl_PerVertex
 
 void main() 
 {
-	outUV = inUV;
-	gl_Position = ubo.projection * ubo.model * vec4(inPos.xyz, 1.0);
+	outUV = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
+	gl_Position = vec4(outUV * 2.0f - 1.0f, 0.0f, 1.0f);
 }

data/shaders/shadowmapping/scene.frag

@@ -11,6 +11,8 @@ layout (location = 2) in vec3 inViewVec;
 layout (location = 3) in vec3 inLightVec;
 layout (location = 4) in vec4 inShadowCoord;
 
+layout (constant_id = 0) const int enablePCF = 0;
+
 layout (location = 0) out vec4 outFragColor;
 
 #define ambient 0.1
@@ -55,7 +57,7 @@ float filterPCF(vec4 sc)
 
 void main() 
 {	
-	float shadow = filterPCF(inShadowCoord / inShadowCoord.w);
+	float shadow = (enablePCF == 1) ? filterPCF(inShadowCoord / inShadowCoord.w) : textureProj(inShadowCoord / inShadowCoord.w, vec2(0.0));
 
 	vec3 N = normalize(inNormal);
 	vec3 L = normalize(inLightVec);