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c/render: Document compute distortion shader sampling code

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This commit is contained in:
Jakob Bornecrantz 2022-04-15 21:48:43 +01:00
parent f4d3c8a93f
commit 87ea035416
2 changed files with 18 additions and 0 deletions
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9
src/xrt/compositor/shaders/distortion.comp
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@ -36,6 +36,15 @@ vec2 position_to_uv(ivec2 extent, uint ix, uint iy)
// Emulate a triangle sample position by offset half target pixel size.
dist_uv = dist_uv + extent_pixel_size / 2.0;
// In order to correctly sample we need to put position (0, 0) in the
// middle of the (0, 0) texel in the distortion texures. That's why we
// offset with half the texel size, pushing all samples into the middle
// of each texels, a kin to a vertex buffer. We need to put uv coord
// (1, 1) in the middle of the last texel, that pixel is (size - 1)
// texels away from the first texel. So we need to scale [0 .. 1] to
// [0 .. size - 1].
#define DIM (128.0)
#define STRETCH ((DIM - 1.0) / DIM)
#define OFFSET (1.0 / (DIM * 2.0))

9
src/xrt/compositor/shaders/distortion_timewarp.comp
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@ -36,6 +36,15 @@ vec2 position_to_uv(ivec2 extent, uint ix, uint iy)
// Emulate a triangle sample position by offset half target pixel size.
dist_uv = dist_uv + extent_pixel_size / 2.0;
// In order to correctly sample we need to put position (0, 0) in the
// middle of the (0, 0) texel in the distortion texures. That's why we
// offset with half the texel size, pushing all samples into the middle
// of each texels, a kin to a vertex buffer. We need to put uv coord
// (1, 1) in the middle of the last texel, that pixel is (size - 1)
// texels away from the first texel. So we need to scale [0 .. 1] to
// [0 .. size - 1].
#define DIM (128.0)
#define STRETCH ((DIM - 1.0) / DIM)
#define OFFSET (1.0 / (DIM * 2.0))