Title:           [OpenGL Shading] pointLighting.vsh
Author:          dajfarrell
Pastebin link:   http://pastebin.com/VTF0hu5n
First Edit:      Wednesday 6th of June 2012 06:50:56 PM CDT
Last Edit:       Wednesday 6th of June 2012 06:50:56 PM CDT

uniform mat4 pl_ModelViewMatrix;
uniform mat4 pl_ProjectionMatrix;
 
varying vec3 vDiffuse, vAmbient, vGlobalAmbient;
varying vec3 vNormal, vLightDir, vHalfVector;
varying float fDistance;
 
void main() {
    // Calculate position.
    vec4 vPosition = pl_ProjectionMatrix * pl_ModelViewMatrix * gl_Vertex;
   
    // Set up normal matrix.
    mat3 mNormalMatrix;
    mNormalMatrix[0] = pl_ModelViewMatrix[0].xyz;
    mNormalMatrix[1] = pl_ModelViewMatrix[1].xyz;
    mNormalMatrix[2] = pl_ModelViewMatrix[2].xyz;
   
    // Calculate normal vector.
    vNormal = normalize(mNormalMatrix * gl_Normal);
   
    // Calculate eye camera position.
    vec4 vEyeCameraPosition = pl_ModelViewMatrix * gl_Vertex;
   
    // Calculate light position position.
    vec4 vLightPosition = pl_ModelViewMatrix * vec4(1.0, 1.0, 1.0, 1.0);
    vLightPosition = vec4(0.0, 0.0, 1.0, 1.0);
   
    // Calculate aux vector.
    vec3 vAux = vLightPosition.xyz - vec3(vEyeCameraPosition);
   
    // Calculate light direction and light distance.
    vLightDir = normalize(vAux);
    fDistance = length(vAux);
   
    // Calculate half vector.
    vHalfVector = normalize(vLightDir - normalize(vec3(vEyeCameraPosition)));
    //vHalfVector = vLightDir;
   
    // Set up diffuse vector and ambient vectors.
    vDiffuse = vec3(1.0, 0.5, 0.0);
    vAmbient = vec3(0.0);
    vGlobalAmbient = vec3(0.05);
   
    // Set final position.
    gl_Position = vPosition;
}