OB - Brick shader by MrDutchy

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// // Vertex shader for procedural bricks // // Authors: Dave Baldwin, Steve Koren, Randi Rost //          based on a shader by Darwyn Peachey // // Copyright (c) 2002-2004 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) 2002-2004 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); }