149 lines
No EOL
4.4 KiB
GLSL
149 lines
No EOL
4.4 KiB
GLSL
#version 450
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layout(location = 0) out vec4 outPos;
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layout(location = 1) out vec3 outNormal;
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layout(location = 2) out vec3 outTangent;
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layout(location = 3) out vec3 outBitangent;
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layout(location = 4) out vec2 outTextCoords;
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layout(location = 5) out mat4 viewMatrix;
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layout(set = 0, binding = 0) uniform ProjUniform { mat4 matrix; } projUniform;
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layout(set = 1, binding = 0) uniform ViewUniform { mat4 matrix; } viewUniform;
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layout(set = 4, binding = 0) readonly buffer FaceBuffer {
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uint faces[];
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};
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layout(push_constant) uniform pc {
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vec4 ModelOffset;
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vec4 Padding0;
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vec4 Padding1;
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vec4 Padding2;
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} push_constants;
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const uint TRI_TO_CORNER[6] = uint[6](0u, 1u, 2u, 0u, 2u, 3u);
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const vec3 NORMALS[6] = vec3[6](
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vec3( 0.0, 1.0, 0.0),
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vec3( 0.0, -1.0, 0.0),
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vec3( 1.0, 0.0, 0.0),
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vec3(-1.0, 0.0, 0.0),
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vec3( 0.0, 0.0, 1.0),
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vec3( 0.0, 0.0, -1.0)
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);
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const vec3 TANGENTS[6] = vec3[6](
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vec3( 1.0, 0.0, 0.0),
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vec3( 1.0, 0.0, 0.0),
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vec3( 0.0, 0.0, -1.0),
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vec3( 0.0, 0.0, 1.0),
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vec3( 1.0, 0.0, 0.0),
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vec3(-1.0, 0.0, 0.0)
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);
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const vec3 BITANGENTS[6] = vec3[6](
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vec3( 0.0, 0.0, 1.0),
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vec3( 0.0, 0.0, -1.0),
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vec3( 0.0, 1.0, 0.0),
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vec3( 0.0, 1.0, 0.0),
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vec3( 0.0, 1.0, 0.0),
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vec3( 0.0, 1.0, 0.0)
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);
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const vec2 CORNER_UVS[16] = vec2[16](
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vec2(0.5, 0.0),
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vec2(0.5, 0.5),
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vec2(1.0, 0.5),
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vec2(1.0, 0.0),
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vec2(0.0, 0.5),
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vec2(0.0, 1.0),
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vec2(0.5, 1.0),
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vec2(0.5, 0.5),
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vec2(0.5, 0.0),
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vec2(0.5, 0.5),
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vec2(1.0, 0.5),
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vec2(1.0, 0.0),
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vec2(0.5, 0.0),
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vec2(0.5, 0.5),
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vec2(1.0, 0.5),
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vec2(1.0, 0.0)
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);
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vec3 buildFaceCornerPosition(uvec3 voxelPos, uint faceId, uint cornerIndex) {
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vec3 p = vec3(voxelPos);
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if (faceId == 0u) {
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if (cornerIndex == 0u) return p + vec3(0.0, 1.0, 0.0);
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if (cornerIndex == 1u) return p + vec3(0.0, 1.0, 1.0);
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if (cornerIndex == 2u) return p + vec3(1.0, 1.0, 1.0);
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return p + vec3(1.0, 1.0, 0.0);
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}
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if (faceId == 1u) {
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if (cornerIndex == 0u) return p + vec3(0.0, 0.0, 0.0);
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if (cornerIndex == 1u) return p + vec3(1.0, 0.0, 0.0);
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if (cornerIndex == 2u) return p + vec3(1.0, 0.0, 1.0);
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return p + vec3(0.0, 0.0, 1.0);
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}
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if (faceId == 2u) {
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if (cornerIndex == 0u) return p + vec3(1.0, 0.0, 0.0);
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if (cornerIndex == 1u) return p + vec3(1.0, 1.0, 0.0);
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if (cornerIndex == 2u) return p + vec3(1.0, 1.0, 1.0);
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return p + vec3(1.0, 0.0, 1.0);
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}
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if (faceId == 3u) {
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if (cornerIndex == 0u) return p + vec3(0.0, 0.0, 0.0);
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if (cornerIndex == 1u) return p + vec3(0.0, 0.0, 1.0);
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if (cornerIndex == 2u) return p + vec3(0.0, 1.0, 1.0);
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return p + vec3(0.0, 1.0, 0.0);
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}
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if (faceId == 4u) {
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if (cornerIndex == 0u) return p + vec3(0.0, 0.0, 1.0);
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if (cornerIndex == 1u) return p + vec3(1.0, 0.0, 1.0);
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if (cornerIndex == 2u) return p + vec3(1.0, 1.0, 1.0);
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return p + vec3(0.0, 1.0, 1.0);
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}
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if (cornerIndex == 0u) return p + vec3(0.0, 0.0, 0.0);
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if (cornerIndex == 1u) return p + vec3(0.0, 1.0, 0.0);
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if (cornerIndex == 2u) return p + vec3(1.0, 1.0, 0.0);
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return p + vec3(1.0, 0.0, 0.0);
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}
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void main() {
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viewMatrix = viewUniform.matrix;
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uint faceRecordIndex = uint(gl_VertexIndex) / 6u;
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uint triangleVertex = uint(gl_VertexIndex) % 6u;
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uint cornerIndex = TRI_TO_CORNER[triangleVertex];
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uint packedFace = faces[faceRecordIndex];
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uint voxelX = packedFace & 0x1Fu;
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uint voxelY = (packedFace >> 5u) & 0x1Fu;
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uint voxelZ = (packedFace >> 10u) & 0x1Fu;
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uint faceId = (packedFace >> 15u) & 0x7u;
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uint matId = (packedFace >> 18u) & 0xFFu;
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faceId = min(faceId, 5u);
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matId = min(matId, 3u);
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vec3 localPos = buildFaceCornerPosition(uvec3(voxelX, voxelY, voxelZ), faceId, cornerIndex);
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vec3 worldPos = localPos + push_constants.ModelOffset.xyz * 16.0;
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vec4 worldPosVec4 = vec4(worldPos, 1.0);
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gl_Position = projUniform.matrix * viewUniform.matrix * worldPosVec4;
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outPos = worldPosVec4;
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outNormal = NORMALS[faceId];
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outTangent = TANGENTS[faceId];
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outBitangent = BITANGENTS[faceId];
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outTextCoords = CORNER_UVS[cornerIndex + 4u * matId];
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} |