46 lines
1.3 KiB
GLSL
46 lines
1.3 KiB
GLSL
#version 330 core
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layout (location = 0) in vec3 aPos;
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layout (location = 1) in vec3 aNormal;
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layout (location = 2) in vec2 aTexCoord;
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out vec3 FragPos;
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out vec3 Normal;
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out vec2 TexCoord;
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uniform mat4 proj;
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uniform mat4 view;
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uniform mat4 modl;
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uniform int uvMode = 0; // 0 = stretch, 1 = tile
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uniform vec3 tileScale = vec3(1.0);
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uniform vec2 uvOffset = vec2(0.0);
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// Same direction as transpose(inverse(m)) for normals, without the per vertex inverse
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mat3 CofactorMatrix(mat3 m)
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{
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return mat3(cross(m[1], m[2]), cross(m[2], m[0]), cross(m[0], m[1]));
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}
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// Tiling ignores the mesh's uvs and projects from whichever axis the surface faces,
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// so every face of a stretched cube repeats at the same size
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vec2 SurfaceUV()
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{
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if (uvMode == 0) return aTexCoord + uvOffset;
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// Unscale the normal first, so a stretched mesh picks the axis it faces in the world
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vec3 n = abs(aNormal / max(tileScale, vec3(1e-4)));
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vec3 p = aPos * tileScale;
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if (n.y >= n.x && n.y >= n.z) return p.xz + uvOffset;
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if (n.x >= n.z) return p.zy + uvOffset;
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return p.xy + uvOffset;
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}
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void main()
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{
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vec4 worldPos = modl * vec4(aPos, 1.0);
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FragPos = worldPos.xyz;
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Normal = normalize(CofactorMatrix(mat3(modl)) * aNormal);
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TexCoord = SurfaceUV();
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gl_Position = proj * view * worldPos;
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}
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