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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, 1.0f));
// 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);
}
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