gistfile1.glsl

#version 110
//----------------------------------------------
//  Environment Vertex Shader
//----------------------------------------------
varying vec3 ReflectDir;
varying float LightIntensity;
uniform vec3   LightPos;
// Eye position in world cordinates
uniform vec3  eye_pos;

void main()
{
    gl_FrontColor = gl_Color;
    gl_Position     = ftransform();


    // Provide model space to world space transform
    mat4 model_to_world = gl_TextureMatrixInverse[0] * 
        gl_ModelViewMatrix;


    vec3 normal     = normalize(gl_NormalMatrix * gl_Normal);
    //vec3 normal     = normalize(gl_NormalMatrix * gl_Normal);

    // Vertex position in world cords
    //vec4 pos_w        = model_to_world * gl_Vertex;
    vec4 pos_w       = gl_ModelViewMatrix * gl_Vertex;

    // Incident and reflection vectors
    //vec3 I     = -(pos_w.xyz - eye_pos.xyz);
    //vec3 I     = -pos_w.xyz;
    vec3 I     = normalize(-gl_TextureMatrixInverse[0] *
            pos_w).xyz;

        //        * mat3(1.0, 0.0, 0.0,
        //             0.0, -1.0, 0.0,
        //             0.0, 0.0, 1.0);

    ReflectDir      = reflect(I, normal);
    //ReflectDir = vec3(-ReflectDir.x, ReflectDir.y, ReflectDir.z);
    LightIntensity  = max(dot(normalize(LightPos - 
                    eye_pos), normal),0.0);
}

//----------------------------------------------
//  Environment Fragment Shader
//----------------------------------------------

// Passed in parameters
uniform vec3 BaseColor;
//uniform float MixRatio;
uniform samplerCube EnvMap;
uniform float reflexivity;

varying vec3 ReflectDir;
varying float LightIntensity;


void main()
{
    // Look up environment map value in cube map
    vec3 envColor = vec3(textureCube(EnvMap, ReflectDir));

    // Add lighting to base color and mix
    vec3 base = LightIntensity * BaseColor;
    base = LightIntensity * gl_Color.rgb;
    envColor = mix(envColor, base, (1.0 - reflexivity)); 
    //envColor = mix(envColor, base, 0.5); 

    //// Use this once reflexivity is being passed in
    //envColor = mix(envColor, base, reflexivity);

    gl_FragColor = vec4(envColor, 1.0);
}