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https://github.com/ciphervance/supercell-wx.git
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38 lines
1 KiB
GLSL
38 lines
1 KiB
GLSL
#version 330 core
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#define DEGREES_MAX 360.0f
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#define LATITUDE_MAX 85.051128779806604f
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#define LONGITUDE_MAX 180.0f
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#define PI 3.1415926535897932384626433f
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#define RAD2DEG 57.295779513082320876798156332941f
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layout (location = 0) in vec2 aLatLong;
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layout (location = 1) in uint aDataMoment;
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layout (location = 2) in uint aCfpMoment;
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uniform mat4 uMVPMatrix;
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uniform vec2 uMapScreenCoord;
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flat out uint dataMoment;
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flat out uint cfpMoment;
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vec2 latLngToScreenCoordinate(in vec2 latLng)
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{
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vec2 p;
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latLng.x = clamp(latLng.x, -LATITUDE_MAX, LATITUDE_MAX);
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p.xy = vec2(LONGITUDE_MAX + latLng.y,
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-(LONGITUDE_MAX - RAD2DEG * log(tan(PI / 4 + latLng.x * PI / DEGREES_MAX))));
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return p;
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}
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void main()
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{
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// Pass the coded data moment to the fragment shader
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dataMoment = aDataMoment;
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cfpMoment = aCfpMoment;
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vec2 p = latLngToScreenCoordinate(aLatLong) - uMapScreenCoord;
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// Transform the position to screen coordinates
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gl_Position = uMVPMatrix * vec4(p, 0.0f, 1.0f);
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}
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