6. Skybox shader code

Vertex shader

#version 150

in vec4 vPosition; // vertex pos
uniform mat4 mP;   // perpsective
uniform mat4 mV;   // view
uniform mat4 mM;   // model

out vec3 texCoords;

void main( void )
{
    texCoords = normalize( vPosition.xyz );
    gl_Position = mP*mV*mM*vPosition;
}

Fragment shader

#version 150

out vec4 vFragColor;
uniform samplerCube cubeMap;
in vec3 texCoords;

void main( void )
{
    vFragColor = texture( cubeMap, texCoords );
}