Atlas - SDL_kmsdrmopengles.c
Home / ext / SDL2 / src / video / kmsdrm Lines: 1 | Size: 6940 bytes [Download] [Show on GitHub] [Search similar files] [Raw] [Raw (proxy)][FILE BEGIN]1/* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2018 Sam Lantinga <[email protected]> 4 5 This software is provided 'as-is', without any express or implied 6 warranty. In no event will the authors be held liable for any damages 7 arising from the use of this software. 8 9 Permission is granted to anyone to use this software for any purpose, 10 including commercial applications, and to alter it and redistribute it 11 freely, subject to the following restrictions: 12 13 1. The origin of this software must not be misrepresented; you must not 14 claim that you wrote the original software. If you use this software 15 in a product, an acknowledgment in the product documentation would be 16 appreciated but is not required. 17 2. Altered source versions must be plainly marked as such, and must not be 18 misrepresented as being the original software. 19 3. This notice may not be removed or altered from any source distribution. 20*/ 21 22#include "../../SDL_internal.h" 23 24#if SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL 25 26#include "SDL_log.h" 27 28#include "SDL_kmsdrmvideo.h" 29#include "SDL_kmsdrmopengles.h" 30#include "SDL_kmsdrmdyn.h" 31 32#ifndef EGL_PLATFORM_GBM_MESA 33#define EGL_PLATFORM_GBM_MESA 0x31D7 34#endif 35 36/* EGL implementation of SDL OpenGL support */ 37 38int 39KMSDRM_GLES_LoadLibrary(_THIS, const char *path) { 40 return SDL_EGL_LoadLibrary(_this, path, ((SDL_VideoData *)_this->driverdata)->gbm, EGL_PLATFORM_GBM_MESA); 41} 42 43SDL_EGL_CreateContext_impl(KMSDRM) 44 45SDL_bool 46KMSDRM_GLES_SetupCrtc(_THIS, SDL_Window * window) { 47 SDL_WindowData *wdata = ((SDL_WindowData *) window->driverdata); 48 SDL_DisplayData *displaydata = (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata; 49 SDL_VideoData *vdata = ((SDL_VideoData *)_this->driverdata); 50 KMSDRM_FBInfo *fb_info; 51 52 if (!(_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, wdata->egl_surface))) { 53 SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "eglSwapBuffers failed on CRTC setup"); 54 return SDL_FALSE; 55 } 56 57 wdata->next_bo = KMSDRM_gbm_surface_lock_front_buffer(wdata->gs); 58 if (wdata->next_bo == NULL) { 59 SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not lock GBM surface front buffer on CRTC setup"); 60 return SDL_FALSE; 61 } 62 63 fb_info = KMSDRM_FBFromBO(_this, wdata->next_bo); 64 if (fb_info == NULL) { 65 return SDL_FALSE; 66 } 67 68 if(KMSDRM_drmModeSetCrtc(vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id, 69 0, 0, &vdata->saved_conn_id, 1, &displaydata->cur_mode) != 0) { 70 SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Could not set up CRTC to a GBM buffer"); 71 return SDL_FALSE; 72 73 } 74 75 wdata->crtc_ready = SDL_TRUE; 76 return SDL_TRUE; 77} 78 79int KMSDRM_GLES_SetSwapInterval(_THIS, int interval) { 80 if (!_this->egl_data) { 81 return SDL_SetError("EGL not initialized"); 82 } 83 84 if (interval == 0 || interval == 1) { 85 _this->egl_data->egl_swapinterval = interval; 86 } else { 87 return SDL_SetError("Only swap intervals of 0 or 1 are supported"); 88 } 89 90 return 0; 91} 92 93int 94KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window) { 95 SDL_WindowData *wdata = ((SDL_WindowData *) window->driverdata); 96 SDL_DisplayData *displaydata = (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata; 97 SDL_VideoData *vdata = ((SDL_VideoData *)_this->driverdata); 98 KMSDRM_FBInfo *fb_info; 99 int ret; 100 101 /* Do we still need to wait for a flip? */ 102 int timeout = 0; 103 if (_this->egl_data->egl_swapinterval == 1) { 104 timeout = -1; 105 } 106 if (!KMSDRM_WaitPageFlip(_this, wdata, timeout)) { 107 return 0; 108 } 109 110 /* Release previously displayed buffer (which is now the backbuffer) and lock a new one */ 111 if (wdata->next_bo != NULL) { 112 KMSDRM_gbm_surface_release_buffer(wdata->gs, wdata->current_bo); 113 /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "Released GBM surface %p", (void *)wdata->next_bo); */ 114 115 wdata->current_bo = wdata->next_bo; 116 wdata->next_bo = NULL; 117 } 118 119 if (!(_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, wdata->egl_surface))) { 120 SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "eglSwapBuffers failed."); 121 return 0; 122 } 123 124 if (wdata->current_bo == NULL) { 125 wdata->current_bo = KMSDRM_gbm_surface_lock_front_buffer(wdata->gs); 126 if (wdata->current_bo == NULL) { 127 return 0; 128 } 129 } 130 131 wdata->next_bo = KMSDRM_gbm_surface_lock_front_buffer(wdata->gs); 132 if (wdata->next_bo == NULL) { 133 SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not lock GBM surface front buffer"); 134 return 0; 135 /* } else { 136 SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "Locked GBM surface %p", (void *)wdata->next_bo); */ 137 } 138 139 fb_info = KMSDRM_FBFromBO(_this, wdata->next_bo); 140 if (fb_info == NULL) { 141 return 0; 142 } 143 if (_this->egl_data->egl_swapinterval == 0) { 144 /* Swap buffers instantly, possible tearing */ 145 /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "drmModeSetCrtc(%d, %u, %u, 0, 0, &%u, 1, &%ux%u@%u)", 146 vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id, vdata->saved_conn_id, 147 displaydata->cur_mode.hdisplay, displaydata->cur_mode.vdisplay, displaydata->cur_mode.vrefresh); */ 148 ret = KMSDRM_drmModeSetCrtc(vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id, 149 0, 0, &vdata->saved_conn_id, 1, &displaydata->cur_mode); 150 if(ret != 0) { 151 SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not pageflip with drmModeSetCrtc: %d", ret); 152 } 153 } else { 154 /* Queue page flip at vsync */ 155 156 /* Have we already setup the CRTC to one of the GBM buffers? Do so if we have not, 157 or FlipPage won't work in some cases. */ 158 if (!wdata->crtc_ready) { 159 if(!KMSDRM_GLES_SetupCrtc(_this, window)) { 160 SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not set up CRTC for doing vsync-ed pageflips"); 161 return 0; 162 } 163 } 164 165 /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "drmModePageFlip(%d, %u, %u, DRM_MODE_PAGE_FLIP_EVENT, &wdata->waiting_for_flip)", 166 vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id); */ 167 ret = KMSDRM_drmModePageFlip(vdata->drm_fd, displaydata->crtc_id, fb_info->fb_id, 168 DRM_MODE_PAGE_FLIP_EVENT, &wdata->waiting_for_flip); 169 if (ret == 0) { 170 wdata->waiting_for_flip = SDL_TRUE; 171 } else { 172 SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not queue pageflip: %d", ret); 173 } 174 175 /* Wait immediately for vsync (as if we only had two buffers), for low input-lag scenarios. 176 Run your SDL2 program with "SDL_KMSDRM_DOUBLE_BUFFER=1 <program_name>" to enable this. */ 177 if (wdata->double_buffer) { 178 KMSDRM_WaitPageFlip(_this, wdata, -1); 179 } 180 } 181 182 return 0; 183} 184 185SDL_EGL_MakeCurrent_impl(KMSDRM) 186 187#endif /* SDL_VIDEO_DRIVER_KMSDRM && SDL_VIDEO_OPENGL_EGL */ 188 189/* vi: set ts=4 sw=4 expandtab: */ 190[FILE END](C) 2025 0x4248 (C) 2025 4248 Media and 4248 Systems, All part of 0x4248 See LICENCE files for more information. 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