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[client] egl: use eglSwapBuffersWithDamageKHR for cursor-only updates

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Instead of damaging the entire surface when rendering a cursor move,
we can use the EGL_KHR_swap_buffers_with_damage extension to only
damage the part of the window covered by the cursor. This should
reduce the cursor movement latency on Wayland.
This commit is contained in:
Quantum
2021-05-11 16:49:39 -04:00
committed by Geoffrey McRae
parent f9a9953071
commit e70cfd84fb
14 changed files with 140 additions and 15 deletions
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49
client/displayservers/Wayland/gl.c
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@@ -41,6 +41,7 @@ bool waylandEGLInit(int w, int h)
DEBUG_ERROR("Failed to create EGL window");
return false;
}
return true;
}
@@ -68,9 +69,51 @@ EGLDisplay waylandGetEGLDisplay(void)
return eglGetDisplay(native);
}
void waylandEGLSwapBuffers(EGLDisplay display, EGLSurface surface)
void waylandEGLSwapBuffers(EGLDisplay display, EGLSurface surface, const struct Rect * damage, int count)
{
eglSwapBuffers(display, surface);
if (!wlWm.eglSwapWithDamageInit)
{
const char *exts = eglQueryString(display, EGL_EXTENSIONS);
wlWm.eglSwapWithDamageInit = true;
if (wl_proxy_get_version((struct wl_proxy *) wlWm.surface) < 4)
DEBUG_INFO("Swapping buffers with damage: not supported, need wl_compositor v4");
else if (strstr(exts, "EGL_KHR_swap_buffers_with_damage") && g_egl_dynProcs.eglSwapBuffersWithDamageKHR)
{
wlWm.eglSwapWithDamage = g_egl_dynProcs.eglSwapBuffersWithDamageKHR;
DEBUG_INFO("Using EGL_KHR_swap_buffers_with_damage");
}
else if (strstr(exts, "EGL_EXT_swap_buffers_with_damage") && g_egl_dynProcs.eglSwapBuffersWithDamageEXT)
{
wlWm.eglSwapWithDamage = g_egl_dynProcs.eglSwapBuffersWithDamageEXT;
DEBUG_INFO("Using EGL_EXT_swap_buffers_with_damage");
}
else
DEBUG_INFO("Swapping buffers with damage: not supported");
}
if (wlWm.eglSwapWithDamage && count)
{
if (count * 4 > wlWm.eglDamageRectCount)
{
free(wlWm.eglDamageRects);
wlWm.eglDamageRects = malloc(sizeof(EGLint) * count * 4);
if (!wlWm.eglDamageRects)
DEBUG_FATAL("Out of memory");
wlWm.eglDamageRectCount = count * 4;
}
for (int i = 0; i < count; ++i)
{
wlWm.eglDamageRects[i*4+0] = damage[i].x;
wlWm.eglDamageRects[i*4+1] = damage[i].y;
wlWm.eglDamageRects[i*4+2] = damage[i].w;
wlWm.eglDamageRects[i*4+3] = damage[i].h;
}
wlWm.eglSwapWithDamage(display, surface, wlWm.eglDamageRects, count);
}
else
eglSwapBuffers(display, surface);
if (wlWm.needsResize)
{
@@ -169,6 +212,6 @@ void waylandGLSetSwapInterval(int interval)
void waylandGLSwapBuffers(void)
{
waylandEGLSwapBuffers(wlWm.glDisplay, wlWm.glSurface);
waylandEGLSwapBuffers(wlWm.glDisplay, wlWm.glSurface, NULL, 0);
}
#endif