| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| |
| #include "../../SDL_internal.h" |
| |
| #if SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL |
| |
| #include "SDL_log.h" |
| |
| #include "SDL_kmsdrmvideo.h" |
| #include "SDL_kmsdrmopengles.h" |
| #include "SDL_kmsdrmdyn.h" |
| |
| #ifndef EGL_PLATFORM_GBM_MESA |
| #define EGL_PLATFORM_GBM_MESA 0x31D7 |
| #endif |
| |
| /* EGL implementation of SDL OpenGL support */ |
| |
| int |
| KMSDRM_GLES_LoadLibrary(_THIS, const char *path) { |
| return SDL_EGL_LoadLibrary(_this, path, ((SDL_VideoData *)_this->driverdata)->gbm, EGL_PLATFORM_GBM_MESA); |
| } |
| |
| SDL_EGL_CreateContext_impl(KMSDRM) |
| |
| int KMSDRM_GLES_SetSwapInterval(_THIS, int interval) { |
| if (!_this->egl_data) { |
| return SDL_SetError("EGL not initialized"); |
| } |
| |
| if (interval == 0 || interval == 1) { |
| _this->egl_data->egl_swapinterval = interval; |
| } else { |
| return SDL_SetError("Only swap intervals of 0 or 1 are supported"); |
| } |
| |
| return 0; |
| } |
| |
| int |
| KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window) { |
| SDL_WindowData *windata = ((SDL_WindowData *) window->driverdata); |
| SDL_DisplayData *dispdata = (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata; |
| SDL_VideoData *viddata = ((SDL_VideoData *)_this->driverdata); |
| KMSDRM_FBInfo *fb_info; |
| int ret, timeout; |
| |
| /* Recreate the GBM / EGL surfaces if the display mode has changed */ |
| if (windata->egl_surface_dirty) { |
| KMSDRM_CreateSurfaces(_this, window); |
| } |
| |
| /* Wait for confirmation that the next front buffer has been flipped, at which |
| point the previous front buffer can be released */ |
| timeout = 0; |
| if (_this->egl_data->egl_swapinterval == 1) { |
| timeout = -1; |
| } |
| if (!KMSDRM_WaitPageFlip(_this, windata, timeout)) { |
| return 0; |
| } |
| |
| /* Release the previous front buffer */ |
| if (windata->curr_bo) { |
| KMSDRM_gbm_surface_release_buffer(windata->gs, windata->curr_bo); |
| /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "Released GBM surface %p", (void *)windata->curr_bo); */ |
| windata->curr_bo = NULL; |
| } |
| |
| windata->curr_bo = windata->next_bo; |
| |
| /* Make the current back buffer the next front buffer */ |
| if (!(_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, windata->egl_surface))) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "eglSwapBuffers failed."); |
| return 0; |
| } |
| |
| /* Lock the next front buffer so it can't be allocated as a back buffer */ |
| windata->next_bo = KMSDRM_gbm_surface_lock_front_buffer(windata->gs); |
| if (!windata->next_bo) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not lock GBM surface front buffer"); |
| return 0; |
| /* } else { |
| SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "Locked GBM surface %p", (void *)windata->next_bo); */ |
| } |
| |
| fb_info = KMSDRM_FBFromBO(_this, windata->next_bo); |
| if (!fb_info) { |
| return 0; |
| } |
| |
| if (!windata->curr_bo) { |
| /* On the first swap, immediately present the new front buffer. Before |
| drmModePageFlip can be used the CRTC has to be configured to use |
| the current connector and mode with drmModeSetCrtc */ |
| ret = KMSDRM_drmModeSetCrtc(viddata->drm_fd, dispdata->crtc_id, fb_info->fb_id, 0, |
| 0, &dispdata->conn->connector_id, 1, &dispdata->mode); |
| |
| if (ret) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not configure CRTC"); |
| } |
| } else { |
| /* On subsequent swaps, queue the new front buffer to be flipped during |
| the next vertical blank */ |
| ret = KMSDRM_drmModePageFlip(viddata->drm_fd, dispdata->crtc_id, fb_info->fb_id, |
| DRM_MODE_PAGE_FLIP_EVENT, &windata->waiting_for_flip); |
| /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "drmModePageFlip(%d, %u, %u, DRM_MODE_PAGE_FLIP_EVENT, &windata->waiting_for_flip)", |
| viddata->drm_fd, displaydata->crtc_id, fb_info->fb_id); */ |
| |
| if (_this->egl_data->egl_swapinterval == 1) { |
| if (ret == 0) { |
| windata->waiting_for_flip = SDL_TRUE; |
| } else { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not queue pageflip: %d", ret); |
| } |
| } |
| |
| /* Wait immediately for vsync (as if we only had two buffers), for low input-lag scenarios. |
| Run your SDL2 program with "SDL_KMSDRM_DOUBLE_BUFFER=1 <program_name>" to enable this. */ |
| if (_this->egl_data->egl_swapinterval == 1 && windata->double_buffer) { |
| KMSDRM_WaitPageFlip(_this, windata, -1); |
| } |
| } |
| |
| return 0; |
| } |
| |
| SDL_EGL_MakeCurrent_impl(KMSDRM) |
| |
| #endif /* SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |