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Elias Naur
c20c1ab96f
Add fboTextureTransform shader function for cancelling the implied transformation from fragments output by the fragment shader and the (u, v) coordinates used to sample from it in a later pass. For OpenGL the transformation is the identity. Signed-off-by: Elias Naur <mail@eliasnaur.com>
18 lines
480 B
PHP
18 lines
480 B
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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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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return t;
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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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