//
// Fragment shader for doom-like lighting on flats
//
// Copyright (c) 2007 by Andrey Budko
//
// See gl_shader.c for license information
//

uniform sampler2D tex;
//uniform sampler2D texDetail;
uniform sampler2D texColormap;
uniform sampler2D texData;

uniform vec2 texSizes;
uniform vec2 texelSizes;
uniform vec2 halfTexelSizes;

uniform float rgbaScale;
uniform float rgbaBias;

uniform float cmFixed;
uniform float cmMinScaled;
uniform float cmMaxScaled;

uniform float Param1;
uniform float Param2;
uniform float Param3;
uniform float Param4;
uniform float Param5;
uniform float Param6;

float cm;
vec2 texCoord;
vec4 final;

void DoFiltering();

void main()
{
  texCoord = gl_TexCoord[0].st - halfTexelSizes;

  float dx;
  float fy;
  float ww;
  if (cmFixed != -1.0)
  {
    cm = cmFixed;
  }
  else
  {
    dx = Param1 + clamp(Param3 / abs(gl_FragCoord.y * Param4 - Param2), 0.0, 127.0 / 2048.0);
    cm = (texture2D(texData, vec2(dx, 0.75)).r) * Param5;
  }

  DoFiltering();

  gl_FragColor = vec4(final.rgb, 1.0) * gl_Color;
}