//

// Authors: Dave Baldwin, Steve Koren, Randi Rost

//          based on a shader by Darwyn Peachey

//

// Copyright (c) 2002-2006 3Dlabs Inc. Ltd.

//

// See 3Dlabs-License.txt for license information

//

 

uniform vec3 LightPosition;

 

const float SpecularContribution = 0.3;

const float DiffuseContribution  = 1.0 - SpecularContribution;

 

varying float LightIntensity;

varying vec2  MCposition;

 

void main(void)

{

    vec3 ecPosition = vec3 (gl_ModelViewMatrix * gl_Vertex);

    vec3 tnorm      = normalize(gl_NormalMatrix * gl_Normal);

    vec3 lightVec   = normalize(LightPosition - ecPosition);

    vec3 reflectVec = reflect(-lightVec, tnorm);

    vec3 viewVec    = normalize(-ecPosition);

    float diffuse   = max(dot(lightVec, tnorm), 0.0);

    float spec      = 0.0;

 

    if (diffuse > 0.0)

    {

        spec = max(dot(reflectVec, viewVec), 0.0);

        spec = pow(spec, 16.0);

    }

 

    LightIntensity  = DiffuseContribution * diffuse +

                      SpecularContribution * spec;

 

    MCposition      = gl_Vertex.xy;

    gl_Position     = ftransform();

}

 

 

//

// Fragment shader for procedural bricks

//

// Authors: Dave Baldwin, Steve Koren, Randi Rost

//          based on a shader by Darwyn Peachey

//

// Copyright (c) 2002-2006 3Dlabs Inc. Ltd.

//

// See 3Dlabs-License.txt for license information

//

 

uniform vec3  BrickColor, MortarColor;

uniform vec2  BrickSize;

uniform vec2  BrickPct;

 

varying vec2  MCposition;

varying float LightIntensity;

 

void main(void)

{

    vec3  color;

    vec2  position, useBrick;

   

    position = MCposition / BrickSize;

 

    if (fract(position.y * 0.5) > 0.5)

        position.x += 0.5;

 

    position = fract(position);

 

    useBrick = step(position, BrickPct);

 

    color  = mix(MortarColor, BrickColor, useBrick.x * useBrick.y);

    color *= LightIntensity;

    gl_FragColor = vec4 (color, 1.0);

}