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c/render: Correctly convert shader index to target pixel uv

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This commit is contained in:
Jakob Bornecrantz 2022-04-15 21:46:52 +01:00
parent ca33ac434c
commit f20031ec99
2 changed files with 22 additions and 8 deletions
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15
src/xrt/compositor/shaders/distortion.comp
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@ -1,4 +1,4 @@
// Copyright 2021, Collabora Ltd.
// Copyright 2021-2022, Collabora Ltd.
// Author: Jakob Bornecrantz <jakob@collabora.com>
// SPDX-License-Identifier: BSL-1.0
@ -24,10 +24,17 @@ layout(set = 0, binding = 3, std140) uniform restrict Config
vec2 position_to_uv(ivec2 extent, uint ix, uint iy)
{
float x = float(ix) / float(extent.x);
float y = float(iy) / float(extent.y);
// Turn the index into floating point.
vec2 xy = vec2(float(ix), float(iy));
vec2 dist_uv = vec2(x, y);
// The inverse of the extent of the target image is the pixel size in [0 .. 1] space.
vec2 extent_pixel_size = vec2(1.0 / float(extent.x), 1.0 / float(extent.y));
// Per-target pixel we move the size of the pixels.
vec2 dist_uv = xy * extent_pixel_size;
// Emulate a triangle sample position by offset half target pixel size.
dist_uv = dist_uv + extent_pixel_size / 2.0;
#define DIM (128.0)
#define STRETCH ((DIM - 1.0) / DIM)

15
src/xrt/compositor/shaders/distortion_timewarp.comp
View file

@ -1,4 +1,4 @@
// Copyright 2021, Collabora Ltd.
// Copyright 2021-2022, Collabora Ltd.
// Author: Jakob Bornecrantz <jakob@collabora.com>
// SPDX-License-Identifier: BSL-1.0
@ -24,10 +24,17 @@ layout(set = 0, binding = 3, std140) uniform restrict Config
vec2 position_to_uv(ivec2 extent, uint ix, uint iy)
{
float x = float(ix) / float(extent.x);
float y = float(iy) / float(extent.y);
// Turn the index into floating point.
vec2 xy = vec2(float(ix), float(iy));
vec2 dist_uv = vec2(x, y);
// The inverse of the extent of the target image is the pixel size in [0 .. 1] space.
vec2 extent_pixel_size = vec2(1.0 / float(extent.x), 1.0 / float(extent.y));
// Per-target pixel we move the size of the pixels.
vec2 dist_uv = xy * extent_pixel_size;
// Emulate a triangle sample position by offset half target pixel size.
dist_uv = dist_uv + extent_pixel_size / 2.0;
#define DIM (128.0)
#define STRETCH ((DIM - 1.0) / DIM)