forked from Mirrors/openclonk
41 lines
1.1 KiB
GLSL
41 lines
1.1 KiB
GLSL
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// Ambient light calculation
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#ifdef HAVE_LIGHT
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uniform sampler2D ambientTex;
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uniform mat3x2 ambientTransform;
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uniform float ambientBrightness;
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#endif
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//uniform float cullMode; // 0 if backface culling is enabled, 1 if it is disabled
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// Already declared in LightShader.glsl
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slice(texture+6)
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{
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#ifdef HAVE_LIGHT
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// Ambient light
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// Extra .xy since some old intel drivers return a vec3
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float ambient = texture2D(ambientTex, (ambientTransform * vec3(gl_FragCoord.xy, 1.0)).xy).r * ambientBrightness;
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#else
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// Lighting disabled: Ambient light everywhere
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float ambient = 1.0;
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#endif
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}
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slice(light+1)
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{
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// Add ambience to brightness
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#ifdef LANDSCAPE
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// For landscape, ambient brightness is coming from top
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vec3 ambientDir = vec3(0.0, -1.0, 0.0);
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light = mix(light, 1.0 + 1.0 * dot(normal, ambientDir), ambient);
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#ifdef HAVE_2PX
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light2 = mix(light2, 1.0 + 1.0 * dot(normal2, ambientDir), ambient);
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#endif
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#else
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// For objects, ambient brightness is coming from the front
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vec3 ambientDir = vec3(0.0, 0.0, 1.0);
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light = mix(light, max(max(dot(normal, ambientDir), 0.0), cullMode * max(dot(-normal, ambientDir), 0.0)), ambient);
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#endif
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}
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