36 lines
1.2 KiB
GLSL
36 lines
1.2 KiB
GLSL
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#include <shaders/lightmap/binding_lightmapper.glsl>
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layout(location = 0) in vec3 aPosition;
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layout(location = 0) out vec3 worldpos;
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layout(location = 1) out flat int InstanceIndex;
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void main()
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{
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vec3 WorldToLocal = constants[gl_InstanceIndex].WorldToLocal;
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float TextureSize = constants[gl_InstanceIndex].TextureSize;
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vec3 ProjLocalToU = constants[gl_InstanceIndex].ProjLocalToU;
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vec3 ProjLocalToV = constants[gl_InstanceIndex].ProjLocalToV;
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float TileX = constants[gl_InstanceIndex].TileX;
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float TileY = constants[gl_InstanceIndex].TileY;
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float TileWidth = constants[gl_InstanceIndex].TileWidth;
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float TileHeight = constants[gl_InstanceIndex].TileHeight;
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InstanceIndex = gl_InstanceIndex;
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worldpos = aPosition;
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// Project to position relative to tile
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vec3 localPos = aPosition - WorldToLocal;
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float x = dot(localPos, ProjLocalToU);
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float y = dot(localPos, ProjLocalToV);
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// Find the position in the output texture
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gl_Position = vec4(vec2(TileX + x, TileY + y) / TextureSize * 2.0 - 1.0, 0.0, 1.0);
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// Clip all surfaces to the edge of the tile (effectly we are applying a viewport/scissor to the tile)
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gl_ClipDistance[0] = x;
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gl_ClipDistance[1] = y;
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gl_ClipDistance[2] = TileWidth - x;
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gl_ClipDistance[3] = TileHeight - y;
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}
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