Oops, add triplanar.cginc

1 files changed, 43 insertions, 0 deletions

diff --git a/triplanar.cginc b/triplanar.cginc
new file mode 100644
index 0000000..0deb8a7
--- /dev/null
+++ b/triplanar.cginc
@@ -0,0 +1,43 @@
+#ifndef __TRIPLANAR_INC
+#define __TRIPLANAR_INC
+
+#include "burley.cginc"
+#include "globals.cginc"
+#include "math.cginc"
+
+#if defined(TRIPLANAR)
+void sample_triplanar(texture2D tex, float3 uv, out float4 s0, out float4 s1, out float4 s2) {
+    s0 = tex.Sample(aniso4_trilinear_repeat_s, uv.yz);
+    s1 = tex.Sample(aniso4_trilinear_repeat_s, uv.xz);
+    s2 = tex.Sample(aniso4_trilinear_repeat_s, uv.xy);
+}
+
+float3 triplanar_weights(float3 worldNormal, float3 uv) {
+    float3 weights = abs(worldNormal);
+    return weights / (weights.x + weights.y + weights.z);
+}
+#endif
+
+void apply_triplanar_layers(float3 worldPos, float3 normal_world, inout Pbr pbr, inout float3 normal_tangent) {
+#if defined(TRIPLANAR)
+    float3 weights = triplanar_weights(normal_world, worldPos);
+#if defined(_TRIPLANAR_LAYER0)
+    {
+        float3 uv = worldPos * _Triplanar_Layer0_Scale;
+        float4 a0, a1, a2;
+        sample_triplanar(_Triplanar_Layer0_MainTex, uv, a0, a1, a2);
+        float3 albedo = a0 * weights.x + a1 * weights.y + a2 * weights.z;
+#if defined(_TRIPLANAR_LAYER0_BURLEY)
+        float3 burley_weights = burley_apply_blend_gamma(weights, _Triplanar_Layer0_Burley_Blend_Gamma);
+        albedo = burley_degaussianize(
+            _Triplanar_Layer0_MainTex_Burley_LUT,
+            burley_apply_soft_clipping(albedo, burley_weights),
+            true);
+#endif  // _TRIPLANAR_LAYER0_BURLEY
+        pbr.albedo.rgb = albedo;
+    }
+#endif  // _TRIPLANAR_LAYER0
+#endif  // TRIPLANAR
+}
+
+#endif  // __TRIPLANAR_INC