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render/gles2: add scissor-based clipping for tile-based renderers

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Add an optional scissor-based clipping strategy to the GLES2 render
pass, it is enabled with WLR_GLES2_SCISSOR_CLIP=1 env var. And it is
disabled by default so it doesn't affect current users.

On tile-based renderers like V3D (Broadcom VideoCore, used in Raspberry
Pi), not using scissoring makes the GPU to render the full-surface.
If scissor is applied only the tiles affected are load/render/stored
reducing the GPU usage.

Patch backported to wlroots 0.19 with labwc on Raspberry Pi OS with
v3d running glxgear 300x300 on top left corner of screen:

- Before: labwc uses 21.5% of GPU render availability.
- After : labwc uses  3.3% of GPU render availability.

This patch over wlroots master with sway on Raspberry Pi OS with
v3d running glxgear half-screen and a terminal half screen:

- Before: sway uses 23.5% of GPU render availability.
- After : sway uses 13.6% of GPU render availability.
This commit is contained in:
Jose Maria Casanova Crespo 2026-03-06 12:07:30 +01:00
parent 736c0f3f25
commit f33853f861
3 changed files with 59 additions and 27 deletions
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6
render/gles2/renderer.c
View file

@ -18,6 +18,7 @@
#include "render/egl.h"
#include "render/gles2.h"
#include "render/pixel_format.h"
#include "util/env.h"
#include "util/time.h"
#include "common_vert_src.h"
@ -541,6 +542,11 @@ struct wlr_renderer *wlr_gles2_renderer_create(struct wlr_egl *egl) {
wlr_log(WLR_INFO, "GL renderer: %s", glGetString(GL_RENDERER));
wlr_log(WLR_INFO, "Supported GLES2 extensions: %s", exts_str);
renderer->scissor = env_parse_bool("WLR_GLES2_SCISSOR_CLIP");
if (renderer->scissor) {
wlr_log(WLR_INFO, "Enabled scissoring clipping");
}
if (!renderer->egl->exts.EXT_image_dma_buf_import) {
wlr_log(WLR_ERROR, "EGL_EXT_image_dma_buf_import not supported");
free(renderer);