| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2021 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 |
| |
| #include "SDL_log.h" |
| |
| #include "SDL_kmsdrmvideo.h" |
| #include "SDL_kmsdrmopengles.h" |
| #include "SDL_kmsdrmdyn.h" |
| #include <errno.h> |
| |
| #ifndef EGL_PLATFORM_GBM_MESA |
| #define EGL_PLATFORM_GBM_MESA 0x31D7 |
| #endif |
| |
| /* EGL implementation of SDL OpenGL support */ |
| |
| void |
| KMSDRM_GLES_DefaultProfileConfig(_THIS, int *mask, int *major, int *minor) |
| { |
| /* if SDL was _also_ built with the Raspberry Pi driver (so we're |
| definitely a Pi device), default to GLES2. */ |
| #if SDL_VIDEO_DRIVER_RPI |
| *mask = SDL_GL_CONTEXT_PROFILE_ES; |
| *major = 2; |
| *minor = 0; |
| #endif |
| } |
| |
| int |
| KMSDRM_GLES_LoadLibrary(_THIS, const char *path) { |
| /* Just pretend you do this here, but don't do it until KMSDRM_CreateWindow(), |
| where we do the same library load we would normally do here. |
| because this gets called by SDL_CreateWindow() before KMSDR_CreateWindow(), |
| so gbm dev isn't yet created when this is called, AND we can't alter the |
| call order in SDL_CreateWindow(). */ |
| #if 0 |
| NativeDisplayType display = (NativeDisplayType)((SDL_VideoData *)_this->driverdata)->gbm_dev; |
| return SDL_EGL_LoadLibrary(_this, path, display, EGL_PLATFORM_GBM_MESA); |
| #endif |
| return 0; |
| } |
| |
| void |
| KMSDRM_GLES_UnloadLibrary(_THIS) { |
| /* As with KMSDRM_GLES_LoadLibrary(), we define our own "dummy" unloading function |
| so we manually unload the library whenever we want. */ |
| } |
| |
| 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 = 0; |
| |
| /* Always wait for the previous issued flip before issing a new one, |
| even if you do async flips. */ |
| uint32_t flip_flags = DRM_MODE_PAGE_FLIP_EVENT; |
| |
| /* Wait for confirmation that the next front buffer has been flipped, at which |
| point the previous front buffer can be released */ |
| if (!KMSDRM_WaitPageFlip(_this, windata)) { |
| return 0; |
| } |
| |
| /* Release the previous front buffer */ |
| if (windata->bo) { |
| KMSDRM_gbm_surface_release_buffer(windata->gs, windata->bo); |
| windata->bo = NULL; |
| } |
| |
| windata->bo = windata->next_bo; |
| |
| /* Mark a buffer to becume the next front buffer. |
| This won't happen until pagelip completes. */ |
| if (!(_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, |
| windata->egl_surface))) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "eglSwapBuffers failed."); |
| return 0; |
| } |
| |
| /* From the GBM surface, get the next BO to become the next front buffer, |
| and lock it so it can't be allocated as a back buffer (to prevent EGL |
| from drawing into it!) */ |
| 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; |
| } |
| |
| /* Get an actual usable fb for the next front buffer. */ |
| fb_info = KMSDRM_FBFromBO(_this, windata->next_bo); |
| if (!fb_info) { |
| return 0; |
| } |
| |
| /* Do we have a modeset pending? If so, configure the new mode on the CRTC. |
| Has to be done before the upcoming pageflip issue, so the buffer with the |
| new size is big enough so the CRTC doesn't read out of bounds. */ |
| if (dispdata->modeset_pending) { |
| |
| ret = KMSDRM_drmModeSetCrtc(viddata->drm_fd, |
| dispdata->crtc->crtc_id, fb_info->fb_id, 0, 0, |
| &dispdata->connector->connector_id, 1, &dispdata->mode); |
| |
| dispdata->modeset_pending = SDL_FALSE; |
| |
| if (ret) { |
| SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not set videomode on CRTC."); |
| } |
| |
| return 0; |
| } |
| |
| /* Issue pageflip on the next front buffer. |
| Remember: drmModePageFlip() never blocks, it just issues the flip, |
| which will be done during the next vblank, or immediately if |
| we pass the DRM_MODE_PAGE_FLIP_ASYNC flag. |
| Since calling drmModePageFlip() will return EBUSY if we call it |
| without having completed the last issued flip, we must pass the |
| DRM_MODE_PAGE_FLIP_ASYNC if we don't block on EGL (egl_swapinterval = 0). |
| That makes it flip immediately, without waiting for the next vblank |
| to do so, so even if we don't block on EGL, the flip will have completed |
| when we get here again. */ |
| |
| if (_this->egl_data->egl_swapinterval == 0) { |
| flip_flags |= DRM_MODE_PAGE_FLIP_ASYNC; |
| } |
| |
| ret = KMSDRM_drmModePageFlip(viddata->drm_fd, dispdata->crtc->crtc_id, |
| fb_info->fb_id, flip_flags, &windata->waiting_for_flip); |
| |
| 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). |
| Even if we are already doing a WaitPageFlip at the begining of this |
| function, this is NOT redundant because here we wait immediately |
| after submitting the image to the screen, reducing lag, and if |
| we have waited here, there won't be a pending pageflip so the |
| WaitPageFlip at the beggining 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 <program_name>" |
| to enable this. */ |
| if (_this->egl_data->egl_swapinterval == 1 && windata->double_buffer) { |
| KMSDRM_WaitPageFlip(_this, windata); |
| } |
| |
| return 0; |
| } |
| |
| SDL_EGL_MakeCurrent_impl(KMSDRM) |
| |
| #endif /* SDL_VIDEO_DRIVER_KMSDRM */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |