| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2018 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) |
| |
| SDL_bool |
| KMSDRM_GLES_SetupCrtc(_THIS, SDL_Window * window) { |
| SDL_WindowData *wdata = ((SDL_WindowData *) window->driverdata); |
| SDL_DisplayData *displaydata = (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata; |
| SDL_VideoData *vdata = ((SDL_VideoData *)_this->driverdata); |
| KMSDRM_FBInfo *fb_info; |
| |
| if (!(_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, wdata->egl_surface))) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "eglSwapBuffers failed on CRTC setup"); |
| return SDL_FALSE; |
| } |
| |
| wdata->crtc_bo = KMSDRM_gbm_surface_lock_front_buffer(wdata->gs); |
| if (wdata->crtc_bo == NULL) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not lock GBM surface front buffer on CRTC setup"); |
| return SDL_FALSE; |
| } |
| |
| fb_info = KMSDRM_FBFromBO(_this, wdata->crtc_bo); |
| if (fb_info == NULL) { |
| return SDL_FALSE; |
| } |
| |
| if(KMSDRM_drmModeSetCrtc(vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id, |
| 0, 0, &vdata->saved_conn_id, 1, &displaydata->cur_mode) != 0) { |
| SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Could not set up CRTC to a GBM buffer"); |
| return SDL_FALSE; |
| |
| } |
| |
| wdata->crtc_ready = SDL_TRUE; |
| return SDL_TRUE; |
| } |
| |
| 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 *wdata = ((SDL_WindowData *) window->driverdata); |
| SDL_DisplayData *displaydata = (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata; |
| SDL_VideoData *vdata = ((SDL_VideoData *)_this->driverdata); |
| KMSDRM_FBInfo *fb_info; |
| int ret; |
| |
| /* Do we still need to wait for a flip? */ |
| int timeout = 0; |
| if (_this->egl_data->egl_swapinterval == 1) { |
| timeout = -1; |
| } |
| if (!KMSDRM_WaitPageFlip(_this, wdata, timeout)) { |
| return 0; |
| } |
| |
| /* Release previously displayed buffer (which is now the backbuffer) and lock a new one */ |
| if (wdata->next_bo != NULL) { |
| KMSDRM_gbm_surface_release_buffer(wdata->gs, wdata->current_bo); |
| /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "Released GBM surface %p", (void *)wdata->next_bo); */ |
| |
| wdata->current_bo = wdata->next_bo; |
| wdata->next_bo = NULL; |
| } |
| |
| if (!(_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, wdata->egl_surface))) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "eglSwapBuffers failed."); |
| return 0; |
| } |
| |
| if (wdata->current_bo == NULL) { |
| wdata->current_bo = KMSDRM_gbm_surface_lock_front_buffer(wdata->gs); |
| if (wdata->current_bo == NULL) { |
| return 0; |
| } |
| } |
| |
| wdata->next_bo = KMSDRM_gbm_surface_lock_front_buffer(wdata->gs); |
| if (wdata->next_bo == NULL) { |
| 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 *)wdata->next_bo); */ |
| } |
| |
| fb_info = KMSDRM_FBFromBO(_this, wdata->next_bo); |
| if (fb_info == NULL) { |
| return 0; |
| } |
| if (_this->egl_data->egl_swapinterval == 0) { |
| /* Swap buffers instantly, possible tearing */ |
| /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "drmModeSetCrtc(%d, %u, %u, 0, 0, &%u, 1, &%ux%u@%u)", |
| vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id, vdata->saved_conn_id, |
| displaydata->cur_mode.hdisplay, displaydata->cur_mode.vdisplay, displaydata->cur_mode.vrefresh); */ |
| ret = KMSDRM_drmModeSetCrtc(vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id, |
| 0, 0, &vdata->saved_conn_id, 1, &displaydata->cur_mode); |
| if(ret != 0) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not pageflip with drmModeSetCrtc: %d", ret); |
| } |
| } else { |
| /* Queue page flip at vsync */ |
| |
| /* Have we already setup the CRTC to one of the GBM buffers? Do so if we have not, |
| or FlipPage won't work in some cases. */ |
| if (!wdata->crtc_ready) { |
| if(!KMSDRM_GLES_SetupCrtc(_this, window)) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not set up CRTC for doing vsync-ed pageflips"); |
| return 0; |
| } |
| } |
| |
| /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "drmModePageFlip(%d, %u, %u, DRM_MODE_PAGE_FLIP_EVENT, &wdata->waiting_for_flip)", |
| vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id); */ |
| ret = KMSDRM_drmModePageFlip(vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id, |
| DRM_MODE_PAGE_FLIP_EVENT, &wdata->waiting_for_flip); |
| if (ret == 0) { |
| wdata->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 (wdata->double_buffer) { |
| KMSDRM_WaitPageFlip(_this, wdata, -1); |
| } |
| } |
| |
| return 0; |
| } |
| |
| SDL_EGL_MakeCurrent_impl(KMSDRM) |
| |
| #endif /* SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |