25 lines
1.1 KiB
GLSL
25 lines
1.1 KiB
GLSL
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// By http://content.gpwiki.org/index.php/OpenGL:Tutorials:GLSL_Bump_Mapping
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// Released under GNU FDL license, without invariant (so DFSG-compliant, see
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// http://wiki.debian.org/DFSGLicenses#Exception)
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varying vec4 passcolor; //The vertex color passed
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varying vec3 LightDir; //The transformed light direction, to pass to the fragment shader
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attribute vec3 tangent; //The inverse tangent to the geometry
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attribute vec3 binormal; //The inverse binormal to the geometry
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uniform vec3 lightdir; //The direction the light is shining
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void main()
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{
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//Put the color in a varying variable
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passcolor = gl_Color;
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//Put the vertex in the position passed
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gl_Position = ftransform();
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//Construct a 3x3 matrix from the geometry’s inverse tangent, binormal, and normal
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mat3 rotmat = mat3(tangent,binormal,gl_Normal);
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//Rotate the light into tangent space
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LightDir = rotmat * normalize(lightdir);
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//Normalize the light
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normalize(LightDir);
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//Use the first set of texture coordinates in the fragment shader
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gl_TexCoord[0] = gl_MultiTexCoord0;
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}
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