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drisw: Modify drisw_swap_buffers_with_damage to swap entire buffer

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When swapping buffer with damage regions, to be strictly correct we
need to swap the entire back buffer to the front buffer. This needs to
be done in case the compositor does not support damage regions. This
means we need to ignore the input damage region and tell drisw to swap
the entire buffer.

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38817>
This commit is contained in:
Lucas Fryzek
2025-12-03 19:33:57 -05:00
committed by Marge Bot
parent 37c3a2fb89
commit 17ab0f2ece
1 changed files with 8 additions and 20 deletions
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28
src/gallium/frontends/dri/drisw.c
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@@ -225,6 +225,13 @@ drisw_copy_to_front(struct pipe_context *pipe,
static void
drisw_swap_buffers_with_damage(struct dri_drawable *drawable, int nrects, const int *rects)
{
/* Damage regions still require us to update the whole front buffer
* in case the compositor doesn't obey them, so we will just ignore
* the passed in damage regions and swap the whole buffer
*/
(void)nrects;
(void)rects;
struct dri_context *ctx = dri_get_current();
struct dri_screen *screen = drawable->screen;
struct pipe_resource *ptex;
@@ -242,25 +249,6 @@ drisw_swap_buffers_with_damage(struct dri_drawable *drawable, int nrects, const
if (ptex) {
struct pipe_fence_handle *fence = NULL;
struct pipe_box stack_boxes[64];
if (nrects > ARRAY_SIZE(stack_boxes))
nrects = 0;
if (nrects) {
for (unsigned int i = 0; i < nrects; i++) {
const int *rect = &rects[i * 4];
int w = MIN2(rect[2], ptex->width0);
int h = MIN2(rect[3], ptex->height0);
int x = CLAMP(rect[0], 0, ptex->width0);
int y = CLAMP(ptex->height0 - rect[1] - h, 0, ptex->height0);
if (h > ptex->height0 - y)
h = ptex->height0 - y;
u_box_2d(x, y, w, h, &stack_boxes[i]);
}
}
if (ctx->pp)
pp_run(ctx->pp, ptex, ptex, drawable->textures[ST_ATTACHMENT_DEPTH_STENCIL]);
@@ -279,7 +267,7 @@ drisw_swap_buffers_with_damage(struct dri_drawable *drawable, int nrects, const
screen->base.screen->fence_finish(screen->base.screen, ctx->st->pipe,
fence, OS_TIMEOUT_INFINITE);
screen->base.screen->fence_reference(screen->base.screen, &fence, NULL);
drisw_copy_to_front(ctx->st->pipe, drawable, ptex, nrects, nrects ? stack_boxes : NULL);
drisw_copy_to_front(ctx->st->pipe, drawable, ptex, 0, NULL);
drawable->buffer_age = 1;
/* TODO: remove this if the framebuffer state doesn't change. */