one file

shaders/lighting/directional/fragment.sc

@@ -6,7 +6,61 @@ $input v_texcoord0, lightDirection, lightColour
 //
 
 #include <teverse.sh>
-#include <../../instancedGeometry/lighting.sh>
+#define PI 3.1415926535f
+
+float toClipSpaceDepth(float _depthTextureZ)
+{
+#if GLSL
+	return _depthTextureZ * 2.0 - 1.0;
+#else
+	return _depthTextureZ;
+#endif
+}
+
+vec3 clipToWorld(mat4 _invViewProj, vec3 _clipPos)
+{
+	vec4 wpos = mul(_invViewProj, vec4(_clipPos, 1.0) );
+	return wpos.xyz / wpos.w;
+}
+
+float DistributionGGX(vec3 N, vec3 H, float roughness)
+{
+    float a      = roughness*roughness;
+    float a2     = a*a;
+    float NdotH  = max(dot(N, H), 0.0);
+    float NdotH2 = NdotH*NdotH;
+	
+    float num   = a2;
+    float denom = (NdotH2 * (a2 - 1.0) + 1.0);
+    denom = PI * denom * denom;
+	
+    return NdotH2;
+}
+
+float GeometrySchlickGGX(float NdotV, float roughness)
+{
+    float r = (roughness + 1.0);
+    float k = (r*r) / 8.0;
+
+    float num   = NdotV;
+    float denom = NdotV * (1.0 - k) + k;
+	
+    return num / denom;
+}
+float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
+{
+    float NdotV = max(dot(N, V), 0.0);
+    float NdotL = max(dot(N, L), 0.0);
+    float ggx2  = GeometrySchlickGGX(NdotV, roughness);
+    float ggx1  = GeometrySchlickGGX(NdotL, roughness);
+	
+    return ggx1 * ggx2;
+}
+
+vec3 fresnelSchlick(float cosTheta, vec3 F0)
+{
+    return F0 + (1.0 - F0) * pow(1.0 - cosTheta, 5.0);
+}  
 
 SAMPLER2D(sColour, 0);
 SAMPLER2D(sNormal, 1);