source: data/data_extern/programs/GLSL/DepthShadowmapReceiverVp.glsl

#version 120

uniform mat4 world;
uniform mat4 worldIT;
uniform mat4 worldViewProj;
uniform mat4 texViewProj;
uniform vec4 lightPosition;
uniform vec4 lightColour;

attribute vec4 vertex;
attribute vec3 normal;

varying vec4 oUv;
varying vec4 outColor;

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

        vec3 worldNorm = (worldIT * vec4(normal, 1.0)).xyz;

        // calculate lighting (simple vertex lighting)
        vec3 lightDir = normalize(
                lightPosition.xyz - (worldPos.xyz * lightPosition.w));

        outColor = lightColour * max(dot(lightDir, worldNorm), 0.0);

        // calculate shadow map coords
        oUv = texViewProj * worldPos;
}