1 files changed, 0 insertions, 133 deletions
diff --git a/examples/models/resources/shaders/glsl100/brdf.fs b/examples/models/resources/shaders/glsl100/brdf.fs
deleted file mode 100644
index d04bc661..00000000
--- a/examples/models/resources/shaders/glsl100/brdf.fs
+++ /dev/null
@@ -1,133 +0,0 @@
-/*******************************************************************************************
-*
-*   BRDF LUT Generation - Bidirectional reflectance distribution function fragment shader
-*
-*   REF: https://github.com/HectorMF/BRDFGenerator
-*
-*   Copyright (c) 2017 Victor Fisac
-*
-**********************************************************************************************/
-
-#version 330
-
-
-// Input vertex attributes (from vertex shader)
-in vec2 fragTexCoord;
-
-// Constant values
-const float PI = 3.14159265359;
-const uint MAX_SAMPLES = 1024u;
-
-// Output fragment color
-out vec4 finalColor;
-
-vec2 Hammersley(uint i, uint N);
-float RadicalInverseVdC(uint bits);
-float GeometrySchlickGGX(float NdotV, float roughness);
-float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness);
-vec3 ImportanceSampleGGX(vec2 Xi, vec3 N, float roughness);
-vec2 IntegrateBRDF(float NdotV, float roughness);
-
-float RadicalInverseVdC(uint bits)
-{
-    bits = (bits << 16u) | (bits >> 16u);
-    bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
-    bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
-    bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
-    bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
-    return float(bits) * 2.3283064365386963e-10; // / 0x100000000
-}
-
-// Compute Hammersley coordinates
-vec2 Hammersley(uint i, uint N)
-{
-	return vec2(float(i)/float(N), RadicalInverseVdC(i));
-}
-
-// Integrate number of importance samples for (roughness and NoV)
-vec3 ImportanceSampleGGX(vec2 Xi, vec3 N, float roughness)
-{
-	float a = roughness*roughness;
-	float phi = 2.0 * PI * Xi.x;
-	float cosTheta = sqrt((1.0 - Xi.y)/(1.0 + (a*a - 1.0)*Xi.y));
-	float sinTheta = sqrt(1.0 - cosTheta*cosTheta);
-
-	// Transform from spherical coordinates to cartesian coordinates (halfway vector)
-	vec3 H = vec3(cos(phi)*sinTheta, sin(phi)*sinTheta, cosTheta);
-
-	// Transform from tangent space H vector to world space sample vector
-	vec3 up = ((abs(N.z) < 0.999) ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0));
-	vec3 tangent = normalize(cross(up, N));
-	vec3 bitangent = cross(N, tangent);
-	vec3 sampleVec = tangent*H.x + bitangent*H.y + N*H.z;
-
-	return normalize(sampleVec);
-}
-
-float GeometrySchlickGGX(float NdotV, float roughness)
-{
-    // For IBL k is calculated different
-    float k = (roughness*roughness)/2.0;
-
-    float nom = NdotV;
-    float denom = NdotV*(1.0 - k) + k;
-
-    return nom/denom;
-}
-
-// Compute the geometry term for the BRDF given roughness squared, NoV, NoL
-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;
-}
-
-vec2 IntegrateBRDF(float NdotV, float roughness)
-{
-    float A = 0.0;
-    float B = 0.0;
-    vec3 V = vec3(sqrt(1.0 - NdotV*NdotV), 0.0, NdotV);
-    vec3 N = vec3(0.0, 0.0, 1.0);
-
-    for (uint i = 0u; i < MAX_SAMPLES; i++)
-    {
-        // Generate a sample vector that's biased towards the preferred alignment direction (importance sampling)
-        
-        vec2 Xi = Hammersley(i, MAX_SAMPLES);       // Compute a Hammersely coordinate
-        vec3 H = ImportanceSampleGGX(Xi, N, roughness); // Integrate number of importance samples for (roughness and NoV)
-        vec3 L = normalize(2.0*dot(V, H)*H - V);    // Compute reflection vector L
-        
-        float NdotL = max(L.z, 0.0);                // Compute normal dot light
-        float NdotH = max(H.z, 0.0);                // Compute normal dot half
-        float VdotH = max(dot(V, H), 0.0);          // Compute view dot half
-
-        if (NdotL > 0.0)
-        {
-            float G = GeometrySmith(N, V, L, roughness);    // Compute the geometry term for the BRDF given roughness squared, NoV, NoL
-            float GVis = (G*VdotH)/(NdotH*NdotV);   // Compute the visibility term given G, VoH, NoH, NoV, NoL
-            float Fc = pow(1.0 - VdotH, 5.0);       // Compute the fresnel term given VoH
-
-            A += (1.0 - Fc)*GVis;                   // Sum the result given fresnel, geometry, visibility
-            B += Fc*GVis;
-        }
-    }
-
-    // Calculate brdf average sample
-    A /= float(MAX_SAMPLES);
-    B /= float(MAX_SAMPLES);
-
-    return vec2(A, B);
-}
-
-void main()
-{
-    // Calculate brdf based on texture coordinates
-    vec2 brdf = IntegrateBRDF(fragTexCoord.x, fragTexCoord.y);
-
-    // Calculate final fragment color
-    finalColor = vec4(brdf.r, brdf.g, 0.0, 1.0);
-}