36 lines
895 B
C
36 lines
895 B
C
 
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// SPDX-License-Identifier: Unlicense OR MIT
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struct m3x2 {
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vec3 r0;
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vec3 r1;
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};
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// fboTransform is the transformation that cancels the implied transformation
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// between the clip space and the framebuffer. Only two rows are returned. The
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// last is implied to be [0, 0, 1].
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const m3x2 fboTransform = m3x2(
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#if defined(LANG_HLSL) || defined(LANG_MSL) || defined(LANG_MSLIOS)
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vec3(1.0, 0.0, 0.0),
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vec3(0.0, -1.0, 0.0)
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#else
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vec3(1.0, 0.0, 0.0),
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vec3(0.0, 1.0, 0.0)
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#endif
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);
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// windowTransform is the transformation that cancels the implied transformation
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// between framebuffer space and window system coordinates.
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const m3x2 windowTransform = m3x2(
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#if defined(LANG_VULKAN)
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vec3(1.0, 0.0, 0.0),
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vec3(0.0, 1.0, 0.0)
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#else
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vec3(1.0, 0.0, 0.0),
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vec3(0.0, -1.0, 0.0)
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#endif
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);
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vec3 transform3x2(m3x2 t, vec3 v) {
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return vec3(dot(t.r0, v), dot(t.r1, v), dot(vec3(0.0, 0.0, 1.0), v));
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}
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