forked from Mirrors/openclonk
70 lines
1.8 KiB
GLSL
70 lines
1.8 KiB
GLSL
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// Base light calculations
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#ifdef HAVE_LIGHT
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uniform sampler2D lightTex;
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#endif
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// uncomment the following lines for debugging light directions:
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// yellow: light up, blue: light down, turqoise: light right, pink: light left
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// brightness: light strength
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//#define LIGHT_DEBUG
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// At what point of light intensity we set the "darkness" point. This
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// is to compensate for the fact that the engine "smoothes" the light
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// and therefore will often never arrive at 0 light intensity.
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const float lightDarknessLevel = 2.0 / 256.0;
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slice(texture+5)
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{
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#ifdef HAVE_LIGHT
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// Query light texture
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vec4 lightPx = texture2D(lightTex, lightCoord.st);
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float lightBright = max(0.0, lightPx.a-lightDarknessLevel);
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vec3 lightDir = extend_normal(vec2(1.0, 1.0) - lightPx.yz * 3.0);
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#else
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// When lighting is disabled, put a light source coming from the camera.
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// Note that in most cases this does not actually matter, since in the
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// case with lighting disabled, ambient lighting takes fully over.
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float lightBright = 0.5;
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vec3 lightDir = vec3(0.0, 0.0, 1.0);
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#endif
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}
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slice(light)
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{
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float light = 2.0 * lightBright * max(dot(normal, lightDir), 0.0);
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#ifdef HAVE_2PX
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float light2 = 2.0 * lightBright * max(dot(normal2, lightDir), 0.0);
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#endif
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}
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slice(color+5)
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{
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// Add light
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color = vec4(light * color.rgb, color.a);
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#ifdef HAVE_2PX
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color2 = vec4(light2 * color2.rgb, color2.a);
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#endif
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}
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slice(finish+5)
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{
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#ifdef LIGHT_DEBUG
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#ifdef HAVE_LIGHT
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float lightYDir = lightPx.b - 1.0/3.0;
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float lightXDir = lightPx.g - 1.0/3.0;
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float lightStrength = lightPx.r;
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color =
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vec4(lightStrength * vec3(1.0-1.5*(max(0.0, lightYDir) + max(0.0,lightXDir)),
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1.0-1.5*(max(0.0, lightYDir) + max(0.0,-lightXDir)),
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1.0-1.5*max(0.0, -lightYDir)),
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1.0);
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#else
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color = vec4(0.0, 0.0, 0.0, 0.0); // invisible
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#endif
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#endif
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}
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