119 lines
3.7 KiB
GLSL
119 lines
3.7 KiB
GLSL
#version 310 es
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#extension GL_EXT_tessellation_shader : require
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layout(vertices = 1) out;
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layout(binding = 0, std140) uniform UBO
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{
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vec4 uScale;
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vec3 uCamPos;
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vec2 uPatchSize;
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vec2 uMaxTessLevel;
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float uDistanceMod;
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vec4 uFrustum[6];
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} _41;
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layout(location = 1) patch out vec2 vOutPatchPosBase;
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layout(location = 2) patch out vec4 vPatchLods;
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layout(location = 0) in vec2 vPatchPosBase[];
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bool frustum_cull(vec2 p0)
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{
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vec2 min_xz = (p0 - vec2(10.0)) * _41.uScale.xy;
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vec2 max_xz = ((p0 + _41.uPatchSize) + vec2(10.0)) * _41.uScale.xy;
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vec3 bb_min = vec3(min_xz.x, -10.0, min_xz.y);
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vec3 bb_max = vec3(max_xz.x, 10.0, max_xz.y);
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vec3 center = (bb_min + bb_max) * 0.5;
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float radius = 0.5 * length(bb_max - bb_min);
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vec3 f0 = vec3(dot(_41.uFrustum[0], vec4(center, 1.0)), dot(_41.uFrustum[1], vec4(center, 1.0)), dot(_41.uFrustum[2], vec4(center, 1.0)));
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vec3 f1 = vec3(dot(_41.uFrustum[3], vec4(center, 1.0)), dot(_41.uFrustum[4], vec4(center, 1.0)), dot(_41.uFrustum[5], vec4(center, 1.0)));
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vec3 _199 = f0;
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float _200 = radius;
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bool _205 = any(lessThanEqual(_199, vec3(-_200)));
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bool _215;
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if (!_205)
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{
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_215 = any(lessThanEqual(f1, vec3(-radius)));
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}
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else
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{
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_215 = _205;
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}
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return !_215;
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}
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float lod_factor(vec2 pos_)
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{
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vec2 pos = pos_ * _41.uScale.xy;
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vec3 dist_to_cam = _41.uCamPos - vec3(pos.x, 0.0, pos.y);
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float level = log2((length(dist_to_cam) + 9.9999997473787516355514526367188e-05) * _41.uDistanceMod);
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return clamp(level, 0.0, _41.uMaxTessLevel.x);
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}
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vec4 tess_level(vec4 lod)
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{
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return exp2(-lod) * _41.uMaxTessLevel.y;
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}
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float tess_level(float lod)
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{
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return _41.uMaxTessLevel.y * exp2(-lod);
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}
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void compute_tess_levels(vec2 p0)
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{
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vOutPatchPosBase = p0;
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vec2 param = p0 + (vec2(-0.5) * _41.uPatchSize);
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float l00 = lod_factor(param);
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vec2 param_1 = p0 + (vec2(0.5, -0.5) * _41.uPatchSize);
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float l10 = lod_factor(param_1);
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vec2 param_2 = p0 + (vec2(1.5, -0.5) * _41.uPatchSize);
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float l20 = lod_factor(param_2);
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vec2 param_3 = p0 + (vec2(-0.5, 0.5) * _41.uPatchSize);
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float l01 = lod_factor(param_3);
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vec2 param_4 = p0 + (vec2(0.5) * _41.uPatchSize);
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float l11 = lod_factor(param_4);
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vec2 param_5 = p0 + (vec2(1.5, 0.5) * _41.uPatchSize);
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float l21 = lod_factor(param_5);
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vec2 param_6 = p0 + (vec2(-0.5, 1.5) * _41.uPatchSize);
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float l02 = lod_factor(param_6);
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vec2 param_7 = p0 + (vec2(0.5, 1.5) * _41.uPatchSize);
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float l12 = lod_factor(param_7);
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vec2 param_8 = p0 + (vec2(1.5) * _41.uPatchSize);
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float l22 = lod_factor(param_8);
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vec4 lods = vec4(dot(vec4(l01, l11, l02, l12), vec4(0.25)), dot(vec4(l00, l10, l01, l11), vec4(0.25)), dot(vec4(l10, l20, l11, l21), vec4(0.25)), dot(vec4(l11, l21, l12, l22), vec4(0.25)));
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vPatchLods = lods;
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vec4 outer_lods = min(lods, lods.yzwx);
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vec4 param_9 = outer_lods;
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vec4 levels = tess_level(param_9);
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gl_TessLevelOuter[0] = levels.x;
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gl_TessLevelOuter[1] = levels.y;
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gl_TessLevelOuter[2] = levels.z;
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gl_TessLevelOuter[3] = levels.w;
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float min_lod = min(min(lods.x, lods.y), min(lods.z, lods.w));
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float param_10 = min(min_lod, l11);
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float inner = tess_level(param_10);
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gl_TessLevelInner[0] = inner;
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gl_TessLevelInner[1] = inner;
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}
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void main()
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{
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vec2 p0 = vPatchPosBase[0];
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vec2 param = p0;
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if (!frustum_cull(param))
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{
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gl_TessLevelOuter[0] = -1.0;
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gl_TessLevelOuter[1] = -1.0;
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gl_TessLevelOuter[2] = -1.0;
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gl_TessLevelOuter[3] = -1.0;
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gl_TessLevelInner[0] = -1.0;
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gl_TessLevelInner[1] = -1.0;
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}
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else
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{
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vec2 param_1 = p0;
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compute_tess_levels(param_1);
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}
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}
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