39 lines
1.1 KiB
GLSL
39 lines
1.1 KiB
GLSL
#version 430 compatibility
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layout(location = 0) in vec3 vertexPosition;
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layout(location = 1) in vec3 vertexNormal;
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out vec3 interpNormal;
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out vec3 fragPos;
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out vec3 TexCoords;
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out vec3 incident;
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out float v_fresnel;
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uniform vec3 viewPos;
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// Indices of refraction
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const float Air = 1.0;
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const float Glass = 4; //1.51714;//4
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// Air to glass ratio of the indices of refraction (Eta)
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const float Eta = Air / Glass;
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// see http://en.wikipedia.org/wiki/Refractive_index Reflectivity
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const float R0 = ((Air - Glass) * (Air - Glass)) / ((Air + Glass) * (Air + Glass));
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uniform mat4 modelMatrix;
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uniform mat4 modelViewProjectionMatrix;
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layout (binding = 0) uniform samplerCube tex_map;
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void main()
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{
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vec4 vertex = modelMatrix * vec4( vertexPosition, 1.0 );
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vec4 camera = vec4( viewPos, 1.0 );
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incident = normalize( vec3( vertex - camera ) );
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v_fresnel = R0 + (1.0 - R0) * pow( (1.0 - dot( -incident, vertexNormal ) ), 5.0);
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interpNormal = mat3(transpose(inverse(modelMatrix))) * vertexNormal;
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fragPos = (modelMatrix * vec4(vertexPosition, 1.0)).xyz;
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gl_Position = modelViewProjectionMatrix * vec4(vertexPosition, 1.0);
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} |