merian-nodes: ggx start implementation

LDAP · Aug 26, 2024 · 9b8e123 · 9b8e123
1 parent f6a2970
commit 9b8e123
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diff --git a/include/merian-shaders/bsdf_ggx.glsl b/include/merian-shaders/bsdf_ggx.glsl
@@ -0,0 +1,12 @@
+#ifndef _MERIAN_SHADERS_BSDF_GGX_H_
+#define _MERIAN_SHADERS_BSDF_GGX_H_
+
+#include "merian-shaders/common.glsl"
+
+// Smiths shadow masking term
+float smith_g1(const float roughness, const float wodotn) {
+    const float alpha_sq = pow(roughness, 4);
+    return 2.0 * wodotn / (wodotn + sqrt(alpha_sq + (1.0 - alpha_sq) * MERIAN_SQUARE(wodotn)));
+}
+
+#endif // _MERIAN_SHADERS_BSDF_GGX_H_
diff --git a/include/merian-shaders/fresnel.glsl b/include/merian-shaders/fresnel.glsl
@@ -0,0 +1,6 @@
+#ifndef _MERIAN_SHADERS_FRESNEL_H_
+#define _MERIAN_SHADERS_FRESNEL_H_
+
+#define fresnel_schlick(minuswi_dot_h, F0) ((F0) + (1. - (F0)) * pow(max(1. - (minuswi_dot_h), 0), 5.))
+
+#endif // _MERIAN_SHADERS_FRESNEL_H_