20 lines
636 B
GLSL
20 lines
636 B
GLSL
// -----------------------------------------------------------------------------
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// Copyright (c) 2009-2016 Nicolas P. Rougier. All rights reserved.
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// Distributed under the (new) BSD License.
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// -----------------------------------------------------------------------------
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vec2 NDC_to_viewport(vec4 position, vec2 viewport)
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{
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vec2 p = position.xy/position.w;
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return (p+1.0)/2.0 * viewport;
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}
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vec4 viewport_to_NDC(vec2 position, vec2 viewport)
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{
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return vec4(2.0*(position/viewport) - 1.0, 0.0, 1.0);
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}
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vec4 viewport_to_NDC(vec2 position, vec2 viewport, float z)
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{
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return vec4(2.0*(position/viewport) - 1.0, z, 1.0);
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} |