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https://github.com/nzp-team/fteqw.git
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32 lines
654 B
Text
32 lines
654 B
Text
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!!cvarf ffov
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//equirectangular view rendering, commonly used for sphere->2d map projections.
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#ifdef VERTEX_SHADER
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attribute vec2 v_texcoord;
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varying vec2 texcoord;
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void main()
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{
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texcoord = v_texcoord.xy;
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gl_Position = ftetransform();
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}
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#endif
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#ifdef FRAGMENT_SHADER
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uniform samplerCube s_t0;
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varying vec2 texcoord;
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uniform float cvar_ffov;
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#define PI 3.1415926535897932384626433832795
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void main()
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{
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vec3 tc;
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float lng = (texcoord.x - 0.5) * PI * 2.0;
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float lat = (texcoord.y) * PI * 1.0;
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tc.z = cos(lng) * sin(lat);
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tc.x = sin(lng) * sin(lat);
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tc.y = cos(lat);
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gl_FragColor = textureCube(s_t0, tc);
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}
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#endif
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