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examples/models/resources/shaders/pbr.vs

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+/*******************************************************************************************
+*
+*   rPBR [shader] - Physically based rendering vertex shader
+*
+*   Copyright (c) 2017 Victor Fisac
+*
+**********************************************************************************************/
+
+#version 330
+
+# Input vertex attributes
+in vec3 vertexPosition
+in vec2 vertexTexCoord
+in vec3 vertexNormal
+in vec4 vertexTangent
+
+# Input uniform values
+uniform mat4 mvp
+uniform mat4 matModel
+
+# Output vertex attributes (to fragment shader)
+out vec3 fragPosition
+out vec2 fragTexCoord
+out vec3 fragNormal
+out vec3 fragTangent
+out vec3 fragBinormal
+
+void main()
+[
+    # Calculate binormal from vertex normal and tangent
+    vec3 vertexBinormal = cross(vertexNormal, vec3(vertexTangent))
+
+    # Calculate fragment normal based on normal transformations
+    mat3 normalMatrix = transpose(inverse(mat3(matModel)))
+
+    # Calculate fragment position based on model transformations
+    fragPosition = vec3(matModel*vec4(vertexPosition, 1.0))
+
+    # Send vertex attributes to fragment shader
+    fragTexCoord = vertexTexCoord
+    fragNormal = normalize(normalMatrix*vertexNormal)
+    fragTangent = normalize(normalMatrix*vec3(vertexTangent))
+    fragTangent = normalize(fragTangent - dot(fragTangent, fragNormal)*fragNormal)
+    fragBinormal = normalize(normalMatrix*vertexBinormal)
+    fragBinormal = cross(fragNormal, fragTangent)
+
+    # Calculate final vertex position
+    gl_Position = mvp*vec4(vertexPosition, 1.0)
+]