55 lines
1.9 KiB
GLSL
55 lines
1.9 KiB
GLSL
#version 330 core
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uniform sampler2D diffuseMap;
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uniform vec2 textureTiling;
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in vec2 fragTexCoord;
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in vec3 fragNormal;
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in vec2 fragTileTexCoord;
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flat in uvec4 occlusionSides;
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flat in int topLeftObscured;
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flat in int topRightObscured;
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flat in int bottomLeftObscured;
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flat in int bottomRightObscured;
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flat in int quadHeight;
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flat in int quadWidth;
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out vec4 outColor;
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// this is a shitty approximation of arcsin(x)/pi that gets the tails right and is reasonably close to the actual arcsin(x)/pi curve.
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float fakeArcsin(float x) {
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x = clamp(x, -1.0, 1.0);
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float ax = abs(x);
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float sqrtPart = sqrt(1.0 - ax);
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float result = 0.5 - sqrtPart * (0.5 - 0.06667 * ax);
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return x < 0.0 ? -result : result;
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}
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void main()
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{
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vec2 texCoord = (floor(fragTexCoord*textureTiling) + fract(fragTileTexCoord)) / textureTiling;
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outColor = texture(diffuseMap, texCoord);
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ivec2 floorFragTileTexCoord = ivec2(fragTileTexCoord);
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//if(fragTileTexCoord.x < 1 && (int(occlusionSides.x >> floorFragTileTexCoord.x) & 1) == 1) {
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//if(fragTileTexCoord.x < 1 && (occlusionSides.x & uint(0x20000000)) > uint(0)) {
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//if(fragTileTexCoord.x < 1 && (occlusionSides.x & uint(0x40000000)) > uint(0)) {
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//if(fragTileTexCoord.x < 1 && (occlusionSides.x & uint(0x10000000)) > uint(0)) {
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//if ((fragTileTexCoord.x < 1) && (occlusionSides.x > uint(0))) {
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if(fragTileTexCoord.x < 1 && ((occlusionSides.x >> floorFragTileTexCoord.x) & uint(1)) == uint(1)) {
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outColor *= 0.5 + fakeArcsin(fragTileTexCoord.x);
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}
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outColor.a = 1;
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outColor.r = occlusionSides.x > uint(0) ? 1.0 : 0.0;
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//outColor.g = ((occlusionSides.x & uint(0x01000000)) > uint(0)) ? 1.0 : 0.0;
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uint bit = uint(fragTileTexCoord * 32);
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outColor.g = (((occlusionSides.x >> bit) & uint(1)) == uint(1)) ?
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((bit % uint(2) == uint(0)) ? 1.0 : 0.8):
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((bit % uint(2) == uint(0)) ? 0.0 : 0.2);
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}
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