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atmosphere: smooth front haze with 24-bit distance and dither

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Richard Zink committed 2026-10-12 17:33:31 +02:00
1 parent 8af10a4f4a
commit 7f733b8efe
1 file changed
+12 -5
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vendor/clouds3d.js
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+12 -5
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@@ -460,15 +460,18 @@ var FRAG_SRC = [
'if (uMode == 3) {',
'if (uFrontHazeOn < 0.5) { gl_FragColor = vec4(0.0); return; }',
'vec2 uv = gl_FragCoord.xy / uResolution;',
'float distNorm = texture2D(uTerrainDistTex, uv).a;',
'vec4 distTex = texture2D(uTerrainDistTex, uv);',
'float column = 0.0;',
'if (distNorm > 0.0005 && distNorm < 0.999) {',
'if (distTex.a > 0.5) {',
'float distNorm = (distTex.r * 65536.0 + distTex.g * 256.0 + distTex.b) / 16777215.0;',
'column = hazeColumnToDistance(rd, distNorm * max(1.0, uFarPlane));',
'} else {',
'column = airHazeColumn(rd);',
'}',
'float tau = uFrontHazeDensity * column;',
'float alpha = clamp((1.0 - exp(-tau)) * uFrontHazeGain, 0.0, uFrontHazeMaxAlpha);',
'float dither = fract(sin(dot(gl_FragCoord.xy, vec2(12.9898, 78.233))) * 43758.5453);',
'alpha = clamp(alpha + (dither - 0.5) / 255.0, 0.0, uFrontHazeMaxAlpha);',
'gl_FragColor = vec4(uFrontHazeColor, alpha);',
'return;',
'}',
@@ -818,7 +821,11 @@ var TERRAIN_FRAG_SRC = [
'void main() {',
'if (uDistancePassOn > 0.5) {',
'float d = clamp(length(vViewPos) / max(1.0, uFarPlane), 0.0, 1.0);',
'gl_FragColor = vec4(0.0, 0.0, 0.0, d);',
'float v = d * 16777215.0;',
'float r = floor(v / 65536.0) / 255.0;',
'float g = floor(mod(v, 65536.0) / 256.0) / 255.0;',
'float b = floor(mod(v, 256.0)) / 255.0;',
'gl_FragColor = vec4(r, g, b, 1.0);',
'return;',
'}',
'vec2 gUv = vUV;',
@@ -2274,8 +2281,8 @@ function ensureTerrainDistFbo(gl, w, h) {
terrainDistTex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, terrainDistTex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, w, h, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
terrainDistDepth = gl.createRenderbuffer();