46 lines
867 B
Text
46 lines
867 B
Text
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!!cvarf ffov
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//my attempt at lambert azimuthal equal-area view rendering, because you'll remember that name easily.
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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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uniform float cvar_ffov;
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void main()
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{
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texcoord = v_texcoord.xy;
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//make sure the ffov cvar actually does something meaningful
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texcoord *= cvar_ffov / 90.0;
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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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void main()
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{
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vec3 tc;
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vec2 d;
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vec2 ang;
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d = texcoord;
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//compute the 2d->3d projection
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float sq = d.x*d.x+d.y*d.y;
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if (sq > 4.0)
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gl_FragColor = vec4(0,0,0,1);
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else
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{
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tc.x = sqrt(1.0-(sq/4.0))*d.x;
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tc.y = sqrt(1.0-(sq/4.0))*d.y;
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tc.z = -1.0 + (sq/2.0);
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tc.y *= -1.0;
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tc.z *= -1.0;
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gl_FragColor = textureCube(s_t0, tc);
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}
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}
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#endif
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