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c/render: Add timewarp to mesh shader

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This commit is contained in:
Jakob Bornecrantz 2023-10-02 15:38:39 +01:00
parent 09c7aaf97a
commit 899f02e17c
2 changed files with 43 additions and 3 deletions
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5
src/xrt/compositor/render/render_interface.h
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@ -828,8 +828,11 @@ render_gfx_close(struct render_gfx *rr);
struct render_gfx_mesh_ubo_data
{
struct xrt_matrix_2x2 vertex_rot;
struct xrt_normalized_rect post_transform;
// Only used for timewarp.
struct xrt_normalized_rect pre_transform;
struct xrt_matrix_4x4 transform;
};
/*!

41
src/xrt/compositor/shaders/mesh.vert
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@ -1,4 +1,4 @@
// Copyright 2019-2021, Collabora, Ltd.
// Copyright 2019-2023, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
// Author: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
// Author: Pete Black <pete.black@collabora.com>
@ -6,11 +6,17 @@
#version 450
// Should we do timewarp.
layout(constant_id = 0) const bool do_timewarp = false;
layout (binding = 1, std140) uniform Config
{
vec4 vertex_rot;
vec4 post_transform;
// Only used for timewarp.
vec4 pre_transform;
mat4 transform;
} ubo;
layout (location = 0) in vec4 in_pos_ruv;
@ -25,7 +31,7 @@ out gl_PerVertex
};
vec2 transform_uv(vec2 uv)
vec2 transform_uv_subimage(vec2 uv)
{
vec2 values = uv;
@ -36,6 +42,37 @@ vec2 transform_uv(vec2 uv)
return values.xy;
}
vec2 transform_uv_timewarp(vec2 uv)
{
vec4 values = vec4(uv, -1, 1);
// From uv to tan angle (tangent space).
values.xy = fma(values.xy, ubo.pre_transform.zw, ubo.pre_transform.xy);
values.y = -values.y; // Flip to OpenXR coordinate system.
// Timewarp.
values = ubo.transform * values;
values.xy = values.xy * (1.0 / max(values.w, 0.00001));
// From [-1, 1] to [0, 1]
values.xy = values.xy * 0.5 + 0.5;
// To deal with OpenGL flip and sub image view.
values.xy = fma(values.xy, ubo.post_transform.zw, ubo.post_transform.xy);
// Done.
return values.xy;
}
vec2 transform_uv(vec2 uv)
{
if (do_timewarp) {
return transform_uv_timewarp(uv);
} else {
return transform_uv_subimage(uv);
}
}
void main()
{
mat2x2 rot = {