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/*
* Background and fog fragment header
*/
uniform sampler2D bgTextureMap;
uniform vec3 bgSolidColor;
uniform vec2 tileSize;
uniform vec2 tiledSize;
uniform vec2 viewImageSize;
vec3 ComputeBgColor() {
#ifdef bg_image_mode_solid
return bgSolidColor.rgb;
#else
float covered = 1.0;
#ifdef bg_image_mode_1_or_3
// mode 1 (or 3): centered (and repeated)
vec2 bgLookup = 0.5 + (bgTextureLookup - 0.5) / viewImageSize;
#ifndef bg_image_mode_2_or_3
// mode 1: centered
vec2 within01 = step(0., bgLookup) * step(-1., -bgLookup);
covered = within01.x * within01.y;
#endif
#else
#ifdef bg_image_mode_2_or_3
// mode 2: tiled
vec2 bgLookup = mod(bgTextureLookup, tiledSize) / tiledSize;
bgLookup = tileSize * floor(bgLookup / tileSize);
#else
// mode 0: stretched
vec2 bgLookup = bgTextureLookup;
#endif
#endif
vec4 bgColor = texture2D(bgTextureMap, bgLookup);
return mix(bgSolidColor.rgb, bgColor.rgb, min(covered, bgColor.a));
#endif
}
vec4 ApplyFog(vec4 color, float fog) {
#ifdef depth_cue
if (isPicking || fog >= 1.)
return color;
return vec4(mix(ComputeBgColor(), color.rgb, fog), color.a);
#else
return color;
#endif
}
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