65 lines
2.0 KiB
Plaintext
65 lines
2.0 KiB
Plaintext
uniform sampler2D Texture;
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uniform float uAlpha;
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uniform int uPointLightCount;
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uniform vec3 uPointLightPos[4];
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uniform vec3 uPointLightDir[4];
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uniform vec3 uPointLightColor[4];
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uniform vec2 uPointLightWorldXZ[4];
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uniform vec2 uPointLightLimitXZ[4];
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uniform vec3 uAmbientColor;
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uniform vec3 uFogColor;
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varying vec2 texCoord;
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varying float fogDistance;
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varying vec3 fragViewPos;
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varying vec3 fragNormal;
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varying vec2 fragWorldXZ;
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// cos(45 deg) = half-angle for a 90-degree full-angle spotlight
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const float SPOT_COS_OUTER = 0.7071;
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const float SPOT_COS_INNER = 0.82; // slightly tighter inner cone for smooth edge
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void main()
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{
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vec4 color = texture2D(Texture, texCoord);
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if (color.a < 0.1)
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discard;
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vec3 lighting = uAmbientColor;
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bool hasNormal = dot(fragNormal, fragNormal) > 0.001;
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vec3 N = hasNormal ? normalize(fragNormal) : vec3(0.0);
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for (int i = 0; i < 4; i++)
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{
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if (i >= uPointLightCount) break;
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vec3 lightVec = uPointLightPos[i] - fragViewPos;
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float dist = length(lightVec);
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vec3 lightDir = normalize(lightVec);
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// Spotlight cone: angle between the cone axis and the ray from light to fragment
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float cosTheta = dot(-lightDir, normalize(uPointLightDir[i]));
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float spotAtten = smoothstep(SPOT_COS_OUTER, SPOT_COS_INNER, cosTheta);
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if (spotAtten <= 0.0) continue;
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float atten = 1.0 / (1.0 + 0.35 * dist + 0.15 * dist * dist);
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float diff = hasNormal ? max(dot(N, lightDir), 0.0) : 1.0;
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vec2 worldDelta = abs(fragWorldXZ - uPointLightWorldXZ[i]);
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float rectX = 1.0 - smoothstep(uPointLightLimitXZ[i].x - 0.5, uPointLightLimitXZ[i].x + 0.5, worldDelta.x);
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float rectY = 1.0 - smoothstep(uPointLightLimitXZ[i].y - 0.5, uPointLightLimitXZ[i].y + 0.5, worldDelta.y);
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lighting += uPointLightColor[i] * diff * atten * spotAtten * rectX * rectY;
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}
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color.rgb *= lighting;
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vec3 fogColor = uFogColor;
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float fogFactor = clamp((fogDistance - 15.0) / 8.0, 0.0, 1.0);
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color.rgb = mix(color.rgb, fogColor, fogFactor);
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gl_FragColor = vec4(color.rgb, color.a * uAlpha);
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}
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