world_low_fs.glsl

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/**
 * @file
 * @brief Low quality battlescape 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

uniform int BUMPMAP;
uniform float BUMP;

/** Diffuse texture.*/
uniform sampler2D SAMPLER_DIFFUSE;
/** Lightmap.*/
uniform sampler2D SAMPLER_LIGHTMAP;
/** Deluxemap.*/
uniform sampler2D SAMPLER_DELUXEMAP;
/** Normalmap.*/
uniform sampler2D SAMPLER_NORMALMAP;

#define R_DYNAMIC_LIGHTS #replace r_dynamic_lights
#if r_dynamic_lights
in_qualifier vec3 lightDirs[R_DYNAMIC_LIGHTS];
uniform vec4 LIGHTPARAMS[R_DYNAMIC_LIGHTS];
#endif

#include "light_fs.glsl"
#include "fog_fs.glsl"
#include "world_devtools_fs.glsl"
#include "write_fragment_fs.glsl"

in_qualifier vec4 blendColor;

/**
 * @brief main
 */
void main(void) {
   vec4 finalColor = vec4(0.0);
   vec3 light = vec3(0.0);
   vec3 deluxemap;
   /* normalmap should be declared in this scope for developer tools to work */
   vec4 normalmap = vec4(0.0, 0.0, 1.0, 0.5);

   /* lightmap contains pre-computed incoming light color */
   light = texture2D(SAMPLER_LIGHTMAP, gl_TexCoord[1].st).rgb;

   /* deluxemap contains pre-computed incoming light vectors in object tangent space */
   deluxemap = texture2D(SAMPLER_DELUXEMAP, gl_TexCoord[1].st).rgb;
   deluxemap = normalize(deluxemap * 2.0 - 1.0);

#if r_bumpmap
   if (BUMPMAP > 0) {
       /* Sample normalmap.*/
       normalmap = texture2D(SAMPLER_NORMALMAP, gl_TexCoord[0].st);
       normalmap.rgb = normalize(normalmap.rgb * 2.0 - 1.0);
   }
#endif

   /* Modulate incoming light by cos(angle_of_incidence); should be done even bump mapping is disabled, to avoid having flat shading as a result.*/
   light *= clamp(dot(deluxemap, vec3(normalmap.x * BUMP, normalmap.y * BUMP, normalmap.z)), 0.0, 1.0);

   /* Sample the diffuse texture, honoring the parallax offset.*/
   vec4 diffuse = texture2D(SAMPLER_DIFFUSE, gl_TexCoord[0].st);

   /* Add dynamic lights, if any */
   light = clamp(light + LightFragment(normalmap.rgb), 0.0, 2.0);

   finalColor.rgb = diffuse.rgb * light;
   finalColor.a = diffuse.a;

   finalColor *= blendColor;

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

   /* Developer tools, if enabled */
   finalColor = ApplyDeveloperTools(finalColor, normalmap.rgb, light, deluxemap);

   writeFragment(finalColor);
}