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https://git.sr.ht/~eliasnaur/gio
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Elias Naur
51 lines
1.2 KiB
PHP
51 lines
1.2 KiB
PHP
// SPDX-License-Identifier: Unlicense OR MIT
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// fboTextureTransform returns a transformation
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// that cancels the implied transformation between
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// the framebuffer and its texture.
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// Only two rows are returned. The last is implied
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// to be [0, 0, 1].
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vec3[2] fboTextureTransform() {
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vec3[2] t;
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#ifdef HLSL
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t[0] = vec3(1.0, 0.0, 0.0);
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t[1] = vec3(0.0, -1.0, 1.0);
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#else
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t[0] = vec3(1.0, 0.0, 0.0);
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t[1] = vec3(0.0, 1.0, 0.0);
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#endif
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return t;
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}
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// fboTransform returns a transformation
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// that cancels the implied transformation between
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// the clip space and the framebuffer.
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// Only two rows are returned. The last is implied
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// to be [0, 0, 1].
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vec3[2] fboTransform() {
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vec3[2] t;
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#ifdef HLSL
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t[0] = vec3(1.0, 0.0, 0.0);
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t[1] = vec3(0.0, 1.0, 0.0);
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#else
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t[0] = vec3(1.0, 0.0, 0.0);
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t[1] = vec3(0.0, -1.0, 0.0);
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#endif
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return t;
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}
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// toClipSpace converts an OpenGL gl_Position value to a
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// native GPU position.
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vec4 toClipSpace(vec4 pos) {
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#ifdef HLSL
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// Map depths to the Direct3D [0; 1] range.
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return vec4(pos.xy, (pos.z + pos.w)*.5, pos.w);
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#else
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return pos;
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#endif
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}
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vec3 transform3x2(vec3[2] t, vec3 v) {
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return vec3(dot(t[0], v), dot(t[1], v), dot(vec3(0.0, 0.0, 1.0), v));
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}
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