97 lines
1.9 KiB
Plaintext
97 lines
1.9 KiB
Plaintext
#version 310 es
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layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;
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layout(binding = 0, std430) readonly buffer Distribution
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{
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vec2 distribution[];
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} _136;
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layout(binding = 2, std140) uniform UBO
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{
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vec4 uModTime;
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} _165;
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layout(binding = 1, std430) writeonly buffer HeightmapFFT
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{
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uint heights[];
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} _224;
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uvec2 workaround_mix(uvec2 a, uvec2 b, bvec2 sel)
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{
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uint _83;
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if (sel.x)
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{
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_83 = b.x;
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}
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else
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{
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_83 = a.x;
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}
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uint _93 = _83;
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uint _94;
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if (sel.y)
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{
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_94 = b.y;
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}
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else
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{
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_94 = a.y;
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}
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return uvec2(_93, _94);
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}
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vec2 alias(vec2 i, vec2 N)
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{
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return mix(i, i - N, greaterThan(i, N * 0.5));
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}
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vec2 cmul(vec2 a, vec2 b)
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{
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vec2 r3 = a.yx;
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vec2 r1 = b.xx;
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vec2 R0 = a * r1;
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vec2 r2 = b.yy;
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vec2 R1 = r2 * r3;
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return R0 + vec2(-R1.x, R1.y);
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}
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uint pack2(vec2 v)
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{
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return packHalf2x16(v);
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}
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void generate_heightmap()
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{
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uvec2 N = uvec2(64u, 1u) * gl_NumWorkGroups.xy;
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uvec2 i = gl_GlobalInvocationID.xy;
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uvec2 param = N - i;
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uvec2 param_1 = uvec2(0u);
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bvec2 param_2 = equal(i, uvec2(0u));
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uvec2 wi = workaround_mix(param, param_1, param_2);
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vec2 a = _136.distribution[(i.y * N.x) + i.x];
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vec2 b = _136.distribution[(wi.y * N.x) + wi.x];
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vec2 param_3 = vec2(i);
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vec2 param_4 = vec2(N);
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vec2 k = _165.uModTime.xy * alias(param_3, param_4);
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float k_len = length(k);
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float w = sqrt(9.81000041961669921875 * k_len) * _165.uModTime.z;
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float cw = cos(w);
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float sw = sin(w);
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vec2 param_5 = a;
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vec2 param_6 = vec2(cw, sw);
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a = cmul(param_5, param_6);
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vec2 param_7 = b;
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vec2 param_8 = vec2(cw, sw);
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b = cmul(param_7, param_8);
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b = vec2(b.x, -b.y);
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vec2 res = a + b;
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vec2 param_9 = res;
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_224.heights[(i.y * N.x) + i.x] = pack2(param_9);
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}
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void main()
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{
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generate_heightmap();
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}
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