irrlicht/media/opengl.vert

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GLSL
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// Part of the Irrlicht Engine Shader example.
// Simple GLSL vertex shader
// Please note that these example shaders don't do anything really useful.
// They only demonstrate that shaders can be used in Irrlicht.
uniform mat4 mWorldViewProj;
uniform mat4 mInvWorld;
uniform mat4 mTransWorld;
uniform vec3 mLightPos; // actually just camera-pos in this case
uniform vec4 mLightColor;
void main(void)
{
gl_Position = mWorldViewProj * gl_Vertex;
// transform normal somehow (NOTE: for the real vertex normal you would use an inverse-transpose world matrix instead of mInvWorld)
vec4 normal = vec4(gl_Normal, 0.0);
normal = mInvWorld * normal;
normal = normalize(normal);
// (NOTE: not sure why transposed world is used instead of world?)
vec4 worldpos = gl_Vertex * mTransWorld;
vec4 lightVector = worldpos - vec4(mLightPos,1.0);
lightVector = normalize(lightVector);
float tmp2 = dot(-lightVector, normal);
vec4 tmp = mLightColor * tmp2;
gl_FrontColor = gl_BackColor = vec4(tmp.x, tmp.y, tmp.z, 0.0);
gl_TexCoord[0] = gl_MultiTexCoord0;
}