mirror of https://github.com/ioquake/ioq3.git
99 lines
2.2 KiB
GLSL
99 lines
2.2 KiB
GLSL
uniform sampler2D u_ShadowMap;
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uniform vec3 u_LightForward;
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uniform vec3 u_LightUp;
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uniform vec3 u_LightRight;
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uniform vec4 u_LightOrigin;
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uniform float u_LightRadius;
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varying vec3 var_Position;
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varying vec3 var_Normal;
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float sampleDistMap(sampler2D texMap, vec2 uv, float scale)
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{
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vec3 distv = texture2D(texMap, uv).xyz;
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return dot(distv, vec3(1.0 / (256.0 * 256.0), 1.0 / 256.0, 1.0)) * scale;
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}
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void main()
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{
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vec3 lightToPos = var_Position - u_LightOrigin.xyz;
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vec2 st = vec2(-dot(u_LightRight, lightToPos), dot(u_LightUp, lightToPos));
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float fade = length(st);
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#if defined(USE_DISCARD)
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if (fade >= 1.0)
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{
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discard;
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}
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#endif
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fade = clamp(8.0 - fade * 8.0, 0.0, 1.0);
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st = st * 0.5 + vec2(0.5);
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#if defined(USE_SOLID_PSHADOWS)
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float intensity = max(sign(u_LightRadius - length(lightToPos)), 0.0);
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#else
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float intensity = clamp((1.0 - dot(lightToPos, lightToPos) / (u_LightRadius * u_LightRadius)) * 2.0, 0.0, 1.0);
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#endif
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float lightDist = length(lightToPos);
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float dist;
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#if defined(USE_DISCARD)
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if (dot(u_LightForward, lightToPos) <= 0.0)
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{
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discard;
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}
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if (dot(var_Normal, lightToPos) > 0.0)
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{
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discard;
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}
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#else
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intensity *= max(sign(dot(u_LightForward, lightToPos)), 0.0);
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intensity *= max(sign(-dot(var_Normal, lightToPos)), 0.0);
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#endif
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intensity *= fade;
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#if defined(USE_PCF)
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float part;
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dist = sampleDistMap(u_ShadowMap, st + vec2(-1.0/512.0, -1.0/512.0), u_LightRadius);
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part = max(sign(lightDist - dist), 0.0);
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dist = sampleDistMap(u_ShadowMap, st + vec2( 1.0/512.0, -1.0/512.0), u_LightRadius);
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part += max(sign(lightDist - dist), 0.0);
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dist = sampleDistMap(u_ShadowMap, st + vec2(-1.0/512.0, 1.0/512.0), u_LightRadius);
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part += max(sign(lightDist - dist), 0.0);
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dist = sampleDistMap(u_ShadowMap, st + vec2( 1.0/512.0, 1.0/512.0), u_LightRadius);
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part += max(sign(lightDist - dist), 0.0);
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#if defined(USE_DISCARD)
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if (part <= 0.0)
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{
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discard;
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}
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#endif
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intensity *= part * 0.25;
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#else
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dist = sampleDistMap(u_ShadowMap, st, u_LightRadius);
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#if defined(USE_DISCARD)
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if (lightDist - dist <= 0.0)
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{
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discard;
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}
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#endif
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intensity *= max(sign(lightDist - dist), 0.0);
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#endif
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gl_FragColor.rgb = vec3(0);
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gl_FragColor.a = clamp(intensity, 0.0, 0.75);
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}
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