From 0b25cd2196d1f1764c4bc5d65ea66717b3d124e5 Mon Sep 17 00:00:00 2001 From: vanfanel Date: Thu, 18 Jul 2024 21:21:52 +0200 Subject: [PATCH] Fix KMSDRM double buffering. (cherry picked from commit 5ab1151508ef514b9c5f944da8fc1f3dd6ea0558) --- src/video/kmsdrm/SDL_kmsdrmopengles.c | 2 +- src/video/kmsdrm/SDL_kmsdrmvideo.c | 6 ++++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/src/video/kmsdrm/SDL_kmsdrmopengles.c b/src/video/kmsdrm/SDL_kmsdrmopengles.c index 9b34d68961..cbf86c9498 100644 --- a/src/video/kmsdrm/SDL_kmsdrmopengles.c +++ b/src/video/kmsdrm/SDL_kmsdrmopengles.c @@ -194,7 +194,7 @@ int KMSDRM_GLES_SwapWindow(_THIS, SDL_Window *window) we have waited here, there won't be a pending pageflip so the WaitPageflip at the beginning of this function will be a no-op. Just leave it here and don't worry. - Run your SDL2 program with "SDL_KMSDRM_DOUBLE_BUFFER=1 " + Run your SDL2 program with "SDL_VIDEO_DOUBLE_BUFFER=1 " to enable this. */ if (windata->double_buffer) { if (!KMSDRM_WaitPageflip(_this, windata)) { diff --git a/src/video/kmsdrm/SDL_kmsdrmvideo.c b/src/video/kmsdrm/SDL_kmsdrmvideo.c index e4457921c4..307b4b67c2 100644 --- a/src/video/kmsdrm/SDL_kmsdrmvideo.c +++ b/src/video/kmsdrm/SDL_kmsdrmvideo.c @@ -1478,6 +1478,12 @@ int KMSDRM_CreateWindow(_THIS, SDL_Window *window) windata->viddata = viddata; window->driverdata = windata; + /* Do we want a double buffering scheme to get low video lag? */ + windata->double_buffer = SDL_FALSE; + if (SDL_GetHintBoolean(SDL_HINT_VIDEO_DOUBLE_BUFFER, SDL_FALSE)) { + windata->double_buffer = SDL_TRUE; + } + if (!is_vulkan && !vulkan_mode) { /* NON-Vulkan block. */ /* Maybe you didn't ask for an OPENGL window, but that's what you will get.