source: data/data_extern/programs/GLSL150/DepthShadowmapNormalMapReceiverVp.glsl @ 12202

#version 150

in vec3 tangent;
in vec3 normal;
in vec4 vertex;
in vec4 uv1;

uniform mat4 world;
uniform mat4 worldViewProj;
uniform mat4 texViewProj;
uniform vec4 lightPosition; // object space
uniform vec4 shadowDepthRange;

out vec3 tangentLightDir;
out vec4 oUv0;
out vec4 oUv1;

void main()
{
        gl_Position = worldViewProj * vertex;
        
        vec4 worldPos = world * vertex;

        // Get object space light direction 
    vec3 lightDir = normalize(lightPosition.xyz - (vertex.xyz * lightPosition.w));

        // calculate shadow map coords
        oUv0 = texViewProj * worldPos;
#if LINEAR_RANGE
        // adjust by fixed depth bias, rescale into range
        oUv0.z = (oUv0.z - shadowDepthRange.x) * shadowDepthRange.w;
#endif

        // pass the main uvs straight through unchanged 
        oUv1 = uv1;

        // Calculate the binormal (NB we assume both normal and tangent are 
        // already normalised) 
        vec3 binormal = cross(normal, tangent); 

        // Form a rotation matrix out of the vectors 
        mat3 rotation = mat3(tangent, binormal, normal); 
//      mat3 rotation = mat3(vec3(tangent[0], binormal[0], normal[0]),
//                                              vec3(tangent[1], binormal[1], normal[1]),
//                                              vec3(tangent[2], binormal[2], normal[2]));

        // Transform the light vector according to this matrix 
        tangentLightDir = normalize(rotation * lightDir); 
}