31 lines
974 B
Plaintext
31 lines
974 B
Plaintext
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out vec3 TexCoords;
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uniform int face;
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vec3 cubemapCoord(vec2 uv, int face) {
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vec2 UV = 2.0 * uv - 1.0;
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if (face == 0) return vec3(1.0, -UV.y, -UV.x); // +X
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else if (face == 1) return vec3(-1.0, -UV.y, UV.x); // -X
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else if (face == 2) return vec3(UV.x, 1.0, -UV.y); // +Y
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else if (face == 3) return vec3(UV.x, -1.0, UV.y); // -Y
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else if (face == 4) return vec3(UV.x, -UV.y, 1.0); // +Z
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else return vec3(-UV.x, -UV.y, -1.0); // -Z
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}
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void main()
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{
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// Generate a fullscreen quad
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vec2 positions[6] = vec2[6](
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vec2(-1.0, -1.0),
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vec2( 1.0, -1.0),
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vec2(-1.0, 1.0),
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vec2(-1.0, 1.0),
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vec2( 1.0, -1.0),
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vec2( 1.0, 1.0)
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);
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gl_Position = vec4(positions[gl_VertexID], 0.0, 1.0);
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// Calculate texture coordinates for cubemap
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vec2 texCoord = positions[gl_VertexID] * 0.5 + 0.5;
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TexCoords = cubemapCoord(texCoord, face);
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}
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