warp_fs.glsl

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/**
 * @file
 * @brief Warp fragment shader.
 */

#if r_postprocess
   /*
    * Indicates that gl_FragData is written to, not gl_FragColor.
    * #extension needs to be placed before all non preprocessor code.
    */
   #extension GL_ARB_draw_buffers : enable
#endif

#include "fog_fs.glsl"

#ifndef glsl110
   #if r_postprocess
       /** After glsl1110 this need to be explicitly declared; used by fixed functionality at the end of the OpenGL pipeline.*/
       out vec4 gl_FragData[2];
   #else
       /** After glsl1110 this need to be explicitly declared; used by fixed functionality at the end of the OpenGL pipeline.*/
       out vec4 gl_FragColor;
   #endif
#endif

uniform vec4 OFFSET;
uniform float GLOWSCALE;

uniform sampler2D SAMPLER_DIFFUSE;
uniform sampler2D SAMPLER_WARP;
uniform sampler2D SAMPLER_GLOWMAP;

/**
 * @brief Main.
 */
void main(void) {
   vec4 finalColor = vec4(0.0);

   /* Sample glowmap and calculate final glow color. */
   vec4 glow_tex = texture2D(SAMPLER_GLOWMAP, gl_TexCoord[0].st);
   vec3 glowcolor = glow_tex.rgb * glow_tex.a * GLOWSCALE;

   /* Sample the warp texture at a time-varied offset, */
   vec4 warp = texture2D(SAMPLER_WARP, gl_TexCoord[0].xy + OFFSET.xy);

   /* and derive a diffuse texcoord based on the warp data, */
   vec2 coord = vec2(gl_TexCoord[0].x + warp.z, gl_TexCoord[0].y + warp.w);

   /* sample the diffuse texture, factoring in primary color as well. */
   finalColor = gl_Color * texture2D(SAMPLER_DIFFUSE, coord);

#if r_fog
   /* Add fog.*/
   finalColor = FogFragment(finalColor);
#endif

#if r_postprocess
   gl_FragData[0] = finalColor;
   if (GLOWSCALE > 0.01) {
       gl_FragData[1].rgb = glowcolor;
       gl_FragData[1].a = 1.0;
   } else {
       gl_FragData[1] = vec4(0,0,0,1);
   }
#else
   gl_FragColor.rgb = finalColor.rgb + glowcolor;
   gl_FragColor.a = finalColor.a;
#endif
}