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gl-renderer: Use glClear for solid opaque regions

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If we have a solid region which is opaque, we don't need to go through
blending: we can simply emit a glClear, which has a pretty big benefit
on tilers in particular.

Signed-off-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Daniel Stone 2025-10-03 00:29:07 +02:00
parent af5f2370af
commit f0be8d94a5
1 changed files with 38 additions and 0 deletions
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38
libweston/renderer-gl/gl-renderer.c
View file

@ -2011,6 +2011,37 @@ repaint_region(struct gl_renderer *gr,
gr->barycentric_stream.size = 0;
}
static void
clear_region(struct gl_renderer *gr, struct weston_paint_node *pnode,
pixman_region32_t *repaint)
{
struct weston_output *output = pnode->output;
struct gl_output_state *go = get_output_state(pnode->output);
EGLint *rects;
EGLint nrects;
int i;
pixman_region_to_egl(output, repaint, go->border_status,
&rects, &nrects);
assert(nrects > 0);
/* We must be either fully transparent - punching a hole for an
* underlay - or fully opaque, to use clear rather than blending. */
assert(pnode->solid.a == 0.0f || pnode->solid.a == 1.0f);
set_blend_state(gr, false);
glClearColor(pnode->solid.r, pnode->solid.g, pnode->solid.b,
pnode->solid.a);
glEnable(GL_SCISSOR_TEST);
for (i = 0; i < nrects; i++) {
EGLint *r = &rects[i * 4];
glScissor(r[0], r[1], r[2], r[3]);
glClear(GL_COLOR_BUFFER_BIT);
}
glDisable(GL_SCISSOR_TEST);
free(rects);
}
static void
draw_paint_node(struct weston_paint_node *pnode,
pixman_region32_t *damage /* in global coordinates */)
@ -2045,6 +2076,13 @@ draw_paint_node(struct weston_paint_node *pnode,
goto out;
}
if (!gr->debug_mode && pnode->draw_solid && pnode->is_fully_opaque &&
pnode->view->alpha == 1.0f && !pnode->surf_xform.transform) {
clear_region(gr, pnode, &repaint);
gs->used_in_output_repaint = true;
goto out;
}
if (ensure_surface_buffer_is_ready(gr, gs, pnode) < 0)
goto out;