204 lines
7.6 KiB
C
204 lines
7.6 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#ifdef SDL_VIDEO_DRIVER_KMSDRM
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#include "SDL_kmsdrmvideo.h"
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#include "SDL_kmsdrmopengles.h"
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#include "SDL_kmsdrmdyn.h"
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#include <errno.h>
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#ifndef EGL_PLATFORM_GBM_MESA
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#define EGL_PLATFORM_GBM_MESA 0x31D7
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#endif
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// EGL implementation of SDL OpenGL support
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void KMSDRM_GLES_DefaultProfileConfig(SDL_VideoDevice *_this, int *mask, int *major, int *minor)
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{
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/* if SDL was _also_ built with the Raspberry Pi driver (so we're
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definitely a Pi device) or with the ROCKCHIP video driver
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(it's a ROCKCHIP device), default to GLES2. */
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#if defined(SDL_VIDEO_DRIVER_RPI) || defined(SDL_VIDEO_DRIVER_ROCKCHIP)
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*mask = SDL_GL_CONTEXT_PROFILE_ES;
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*major = 2;
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*minor = 0;
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#endif
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}
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bool KMSDRM_GLES_LoadLibrary(SDL_VideoDevice *_this, const char *path)
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{
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/* Just pretend you do this here, but don't do it until KMSDRM_CreateWindow(),
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where we do the same library load we would normally do here.
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because this gets called by SDL_CreateWindow() before KMSDR_CreateWindow(),
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so gbm dev isn't yet created when this is called, AND we can't alter the
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call order in SDL_CreateWindow(). */
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#if 0
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NativeDisplayType display = (NativeDisplayType)_this->internal->gbm_dev;
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return SDL_EGL_LoadLibrary(_this, path, display, EGL_PLATFORM_GBM_MESA);
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#endif
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return true;
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}
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void KMSDRM_GLES_UnloadLibrary(SDL_VideoDevice *_this)
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{
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/* As with KMSDRM_GLES_LoadLibrary(), we define our own "dummy" unloading function
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so we manually unload the library whenever we want. */
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}
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SDL_EGL_CreateContext_impl(KMSDRM)
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bool KMSDRM_GLES_SetSwapInterval(SDL_VideoDevice *_this, int interval)
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{
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if (!_this->egl_data) {
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return SDL_SetError("EGL not initialized");
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}
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if (interval == 0 || interval == 1) {
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_this->egl_data->egl_swapinterval = interval;
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} else {
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return SDL_SetError("Only swap intervals of 0 or 1 are supported");
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}
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return true;
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}
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bool KMSDRM_GLES_SwapWindow(SDL_VideoDevice *_this, SDL_Window *window)
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{
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SDL_WindowData *windata = window->internal;
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SDL_DisplayData *dispdata = SDL_GetDisplayDriverDataForWindow(window);
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SDL_VideoData *viddata = _this->internal;
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KMSDRM_FBInfo *fb_info;
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int ret = 0;
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/* Always wait for the previous issued flip before issuing a new one,
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even if you do async flips. */
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uint32_t flip_flags = DRM_MODE_PAGE_FLIP_EVENT;
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// Skip the swap if we've switched away to another VT
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if (windata->egl_surface == EGL_NO_SURFACE) {
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// Wait a bit, throttling to ~100 FPS
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SDL_Delay(10);
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return true;
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}
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// Recreate the GBM / EGL surfaces if the display mode has changed
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if (windata->egl_surface_dirty) {
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KMSDRM_CreateSurfaces(_this, window);
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}
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/* Wait for confirmation that the next front buffer has been flipped, at which
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point the previous front buffer can be released */
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if (!KMSDRM_WaitPageflip(_this, windata)) {
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return SDL_SetError("Wait for previous pageflip failed");
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}
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// Release the previous front buffer
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if (windata->bo) {
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KMSDRM_gbm_surface_release_buffer(windata->gs, windata->bo);
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windata->bo = NULL;
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}
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windata->bo = windata->next_bo;
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/* Mark a buffer to become the next front buffer.
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This won't happen until pagelip completes. */
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if (!(_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display,
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windata->egl_surface))) {
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return SDL_SetError("eglSwapBuffers failed");
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}
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/* From the GBM surface, get the next BO to become the next front buffer,
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and lock it so it can't be allocated as a back buffer (to prevent EGL
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from drawing into it!) */
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windata->next_bo = KMSDRM_gbm_surface_lock_front_buffer(windata->gs);
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if (!windata->next_bo) {
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return SDL_SetError("Could not lock front buffer on GBM surface");
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}
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// Get an actual usable fb for the next front buffer.
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fb_info = KMSDRM_FBFromBO(_this, windata->next_bo);
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if (!fb_info) {
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return SDL_SetError("Could not get a framebuffer");
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}
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if (!windata->bo) {
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/* On the first swap, immediately present the new front buffer. Before
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drmModePageFlip can be used the CRTC has to be configured to use
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the current connector and mode with drmModeSetCrtc */
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ret = KMSDRM_drmModeSetCrtc(viddata->drm_fd,
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dispdata->crtc->crtc_id, fb_info->fb_id, 0, 0,
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&dispdata->connector->connector_id, 1, &dispdata->mode);
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if (ret) {
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return SDL_SetError("Could not set videomode on CRTC.");
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}
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} else {
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/* On subsequent swaps, queue the new front buffer to be flipped during
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the next vertical blank
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Remember: drmModePageFlip() never blocks, it just issues the flip,
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which will be done during the next vblank, or immediately if
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we pass the DRM_MODE_PAGE_FLIP_ASYNC flag.
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Since calling drmModePageFlip() will return EBUSY if we call it
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without having completed the last issued flip, we must pass the
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DRM_MODE_PAGE_FLIP_ASYNC if we don't block on EGL (egl_swapinterval = 0).
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That makes it flip immediately, without waiting for the next vblank
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to do so, so even if we don't block on EGL, the flip will have completed
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when we get here again. */
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if (_this->egl_data->egl_swapinterval == 0 && viddata->async_pageflip_support) {
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flip_flags |= DRM_MODE_PAGE_FLIP_ASYNC;
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}
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ret = KMSDRM_drmModePageFlip(viddata->drm_fd, dispdata->crtc->crtc_id,
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fb_info->fb_id, flip_flags, &windata->waiting_for_flip);
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if (ret == 0) {
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windata->waiting_for_flip = true;
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} else {
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SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Could not queue pageflip: %d", ret);
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}
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/* Wait immediately for vsync (as if we only had two buffers).
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Even if we are already doing a WaitPageflip at the beginning of this
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function, this is NOT redundant because here we wait immediately
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after submitting the image to the screen, reducing lag, and if
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we have waited here, there won't be a pending pageflip so the
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WaitPageflip at the beginning of this function will be a no-op.
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Just leave it here and don't worry.
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Run your SDL program with "SDL_VIDEO_DOUBLE_BUFFER=1 <program_name>"
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to enable this. */
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if (windata->double_buffer) {
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if (!KMSDRM_WaitPageflip(_this, windata)) {
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return SDL_SetError("Immediate wait for previous pageflip failed");
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}
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}
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}
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return true;
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}
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SDL_EGL_MakeCurrent_impl(KMSDRM)
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#endif // SDL_VIDEO_DRIVER_KMSDRM
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