mirror of https://github.com/encounter/SDL.git
kmsdrm: update SwapWindow fn, moving it to triple-buffer.
This commit is contained in:
Manuel Alfayate Corchete
parent
ea171c0564
commit
8996ee1786
|
|
@ -73,8 +73,21 @@ static EGLSyncKHR create_fence(int fd, _THIS)
|
|||
return fence;
|
||||
}
|
||||
|
||||
/*
|
||||
-We have to stop the GPU from executing the cmdstream again because the front butter
|
||||
has been marked as back buffer so it can be selected by EGL to draw on it BUT
|
||||
the pageflip has not completed, so it's still on screen, so letting GPU render on it
|
||||
would cause tearing. (kms_fence)
|
||||
-We have to stop the DISPLAY from doing the changes we requested in the atomic ioctl,
|
||||
like the pageflip, until the GPU has completed the cmdstream execution,
|
||||
because we don't want the pageflip to be done in the middle of a frame rendering.
|
||||
(gpu_fence).
|
||||
-We have to stop the program from doing a new atomic ioctl until the previous one
|
||||
has been finished. (kms_fence)
|
||||
*/
|
||||
|
||||
int
|
||||
KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window) {
|
||||
KMSDRM_GLES_SwapWindowDOUBLE(_THIS, SDL_Window * window) {
|
||||
|
||||
SDL_WindowData *windata = ((SDL_WindowData *) window->driverdata);
|
||||
SDL_DisplayData *dispdata = (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata;
|
||||
|
|
@ -85,13 +98,13 @@ KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window) {
|
|||
|
||||
uint32_t flags = DRM_MODE_ATOMIC_NONBLOCK;
|
||||
|
||||
EGLSyncKHR display_in_fence = NULL;
|
||||
EGLSyncKHR display_out_fence = NULL;
|
||||
EGLSyncKHR kms_in_fence = NULL;
|
||||
EGLSyncKHR kms_out_fence = NULL;
|
||||
|
||||
/* Create the display in-fence, and export it as a fence fd to pass into the kernel. */
|
||||
display_in_fence = create_fence(EGL_NO_NATIVE_FENCE_FD_ANDROID, _this);
|
||||
assert(display_in_fence);
|
||||
dispdata->kms_in_fence_fd = _this->egl_data->eglDupNativeFenceFDANDROID(_this->egl_data->egl_display, display_in_fence);
|
||||
kms_in_fence = create_fence(EGL_NO_NATIVE_FENCE_FD_ANDROID, _this);
|
||||
assert(kms_in_fence);
|
||||
dispdata->kms_in_fence_fd = _this->egl_data->eglDupNativeFenceFDANDROID(_this->egl_data->egl_display, kms_in_fence);
|
||||
|
||||
/* Mark the back buffer as the next front buffer, and the current front buffer as elegible
|
||||
by EGL as back buffer to draw into.
|
||||
|
|
@ -124,18 +137,18 @@ KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window) {
|
|||
}
|
||||
|
||||
/* Get the display out fence, returned by the atomic ioctl. */
|
||||
display_out_fence = create_fence(dispdata->kms_out_fence_fd, _this);
|
||||
assert(display_out_fence);
|
||||
kms_out_fence = create_fence(dispdata->kms_out_fence_fd, _this);
|
||||
assert(kms_out_fence);
|
||||
|
||||
/* Wait on the CPU side for the _previous_ commit to complete before we post the flip through KMS,
|
||||
* because atomic will reject the commit if we post a new one while the previous one is still pending. */
|
||||
do {
|
||||
status = _this->egl_data->eglClientWaitSyncKHR(_this->egl_data->egl_display, display_out_fence, 0, EGL_FOREVER_KHR);
|
||||
status = _this->egl_data->eglClientWaitSyncKHR(_this->egl_data->egl_display, kms_out_fence, 0, EGL_FOREVER_KHR);
|
||||
} while (status != EGL_CONDITION_SATISFIED_KHR);
|
||||
|
||||
/* Destroy both in and out display fences. */
|
||||
_this->egl_data->eglDestroySyncKHR(_this->egl_data->egl_display, display_out_fence);
|
||||
_this->egl_data->eglDestroySyncKHR(_this->egl_data->egl_display, display_in_fence);
|
||||
_this->egl_data->eglDestroySyncKHR(_this->egl_data->egl_display, kms_out_fence);
|
||||
_this->egl_data->eglDestroySyncKHR(_this->egl_data->egl_display, kms_in_fence);
|
||||
|
||||
/* Now that the pageflip is complete, release last front buffer so EGL can chose it
|
||||
* as back buffer and render on it again: */
|
||||
|
|
@ -150,6 +163,178 @@ KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window) {
|
|||
return ret;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window) {
|
||||
|
||||
SDL_WindowData *windata = ((SDL_WindowData *) window->driverdata);
|
||||
SDL_DisplayData *dispdata = (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata;
|
||||
KMSDRM_FBInfo *fb;
|
||||
int ret;
|
||||
|
||||
uint32_t flags = DRM_MODE_ATOMIC_NONBLOCK;
|
||||
|
||||
/* Create the fence that will be inserted in the cmdstream exactly at the end
|
||||
of the gl commands that form a frame. KMS will have to wait on it before doing a pageflip. */
|
||||
dispdata->gpu_fence = create_fence(EGL_NO_NATIVE_FENCE_FD_ANDROID, _this);
|
||||
assert(dispdata->gpu_fence);
|
||||
|
||||
_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, windata->egl_surface);
|
||||
|
||||
/* It's safe to get the gpu_fence FD now, because eglSwapBuffers flushes it
|
||||
down the cmdstream, so it's now in place in the cmdstream.
|
||||
Atomic ioctl will pass the in-fence fd into the kernel. */
|
||||
dispdata->kms_in_fence_fd = _this->egl_data->eglDupNativeFenceFDANDROID(_this->egl_data->egl_display, dispdata->gpu_fence);
|
||||
_this->egl_data->eglDestroySyncKHR(_this->egl_data->egl_display, dispdata->gpu_fence);
|
||||
assert(dispdata->kms_in_fence_fd != -1);
|
||||
|
||||
/* Lock the buffer that is marked by eglSwapBuffers() to become the next front buffer (so it can not
|
||||
be chosen by EGL as back buffer to draw on), and get a handle to it to request the pageflip on it. */
|
||||
windata->next_bo = KMSDRM_gbm_surface_lock_front_buffer(windata->gs);
|
||||
if (!windata->next_bo) {
|
||||
printf("Failed to lock frontbuffer\n");
|
||||
return -1;
|
||||
}
|
||||
fb = KMSDRM_FBFromBO(_this, windata->next_bo);
|
||||
if (!fb) {
|
||||
printf("Failed to get a new framebuffer BO\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
/* Don't issue another atomic ioctl until previous one has completed. */
|
||||
if (dispdata->kms_fence) {
|
||||
EGLint status;
|
||||
|
||||
do {
|
||||
status = _this->egl_data->eglClientWaitSyncKHR(_this->egl_data->egl_display, dispdata->kms_fence, 0, EGL_FOREVER_KHR);
|
||||
} while (status != EGL_CONDITION_SATISFIED_KHR);
|
||||
|
||||
_this->egl_data->eglDestroySyncKHR(_this->egl_data->egl_display, dispdata->kms_fence);
|
||||
}
|
||||
|
||||
|
||||
/* Issue atomic commit. */
|
||||
ret = drm_atomic_commit(_this, fb->fb_id, flags);
|
||||
if (ret) {
|
||||
printf("failed to do atomic commit\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
|
||||
/* release last front buffer so EGL can chose it as back buffer and render on it again: */
|
||||
if (windata->curr_bo) {
|
||||
KMSDRM_gbm_surface_release_buffer(windata->gs, windata->curr_bo);
|
||||
windata->curr_bo = NULL;
|
||||
}
|
||||
|
||||
/* Take note of the current front buffer, so it can be freed next time this function is called. */
|
||||
windata->curr_bo = windata->next_bo;
|
||||
|
||||
/* Import out fence from the out fence fd and tell the GPU to wait on it
|
||||
until the requested pageflip has completed. */
|
||||
dispdata->kms_fence = create_fence(dispdata->kms_out_fence_fd, _this);
|
||||
assert(dispdata->kms_fence);
|
||||
|
||||
dispdata->kms_out_fence_fd = -1;
|
||||
|
||||
_this->egl_data->eglWaitSyncKHR(_this->egl_data->egl_display, dispdata->kms_fence, 0);
|
||||
|
||||
return ret;
|
||||
|
||||
}
|
||||
|
||||
int
|
||||
KMSDRM_GLES_SwapWindowOLD(_THIS, SDL_Window * window) {
|
||||
|
||||
SDL_WindowData *windata = ((SDL_WindowData *) window->driverdata);
|
||||
SDL_DisplayData *dispdata = (SDL_DisplayData *) SDL_GetDisplayForWindow(window)->driverdata;
|
||||
KMSDRM_FBInfo *fb;
|
||||
int ret;
|
||||
|
||||
uint32_t flags = DRM_MODE_ATOMIC_NONBLOCK;
|
||||
|
||||
dispdata->kms_fence = NULL; /* in-fence to gpu, out-fence from kms */
|
||||
dispdata->gpu_fence = NULL; /* in-fence to kms, out-fence from gpu, */
|
||||
|
||||
/* Allow modeset (which is done inside atomic_commit). */
|
||||
flags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
|
||||
|
||||
|
||||
/* Import out fence from the out fence fd and tell the GPU to wait on it
|
||||
until the requested pageflip has completed. */
|
||||
dispdata->kms_fence = create_fence(dispdata->kms_out_fence_fd, _this);
|
||||
assert(dispdata->kms_fence);
|
||||
|
||||
dispdata->kms_out_fence_fd = -1;
|
||||
|
||||
|
||||
_this->egl_data->eglWaitSyncKHR(_this->egl_data->egl_display, dispdata->kms_fence, 0);
|
||||
|
||||
|
||||
/* GL DRAW */
|
||||
|
||||
/* Create the gpu fence here so it's inserted in the cmdstream exactly
|
||||
at the end of the gl commands that form a frame. */
|
||||
dispdata->gpu_fence = create_fence(EGL_NO_NATIVE_FENCE_FD_ANDROID, _this);
|
||||
assert(dispdata->gpu_fence);
|
||||
|
||||
_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, windata->egl_surface);
|
||||
|
||||
/* It's safe to get the gpu_fence fd now, because eglSwapBuffers() flushes the fd. */
|
||||
dispdata->kms_in_fence_fd = _this->egl_data->eglDupNativeFenceFDANDROID(_this->egl_data->egl_display, dispdata->gpu_fence);
|
||||
|
||||
_this->egl_data->eglDestroySyncKHR(_this->egl_data->egl_display, dispdata->gpu_fence);
|
||||
assert(dispdata->kms_in_fence_fd != -1);
|
||||
|
||||
windata->next_bo = KMSDRM_gbm_surface_lock_front_buffer(windata->gs);
|
||||
if (!windata->next_bo) {
|
||||
printf("Failed to lock frontbuffer\n");
|
||||
return -1;
|
||||
}
|
||||
fb = KMSDRM_FBFromBO(_this, windata->next_bo);
|
||||
if (!fb) {
|
||||
printf("Failed to get a new framebuffer BO\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (dispdata->kms_fence) {
|
||||
EGLint status;
|
||||
|
||||
do {
|
||||
status = _this->egl_data->eglClientWaitSyncKHR(_this->egl_data->egl_display, dispdata->kms_fence, 0, EGL_FOREVER_KHR);
|
||||
} while (status != EGL_CONDITION_SATISFIED_KHR);
|
||||
|
||||
_this->egl_data->eglDestroySyncKHR(_this->egl_data->egl_display, dispdata->kms_fence);
|
||||
}
|
||||
|
||||
|
||||
/* Issue atomic commit. */
|
||||
ret = drm_atomic_commit(_this, fb->fb_id, flags);
|
||||
if (ret) {
|
||||
printf("failed to do atomic commit\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
|
||||
/* release last front buffer so EGL can chose it as back buffer and render on it again: */
|
||||
if (windata->curr_bo) {
|
||||
KMSDRM_gbm_surface_release_buffer(windata->gs, windata->curr_bo);
|
||||
windata->curr_bo = NULL;
|
||||
}
|
||||
|
||||
/* Take note of the current front buffer, so it can be freed next time this function is called. */
|
||||
windata->curr_bo = windata->next_bo;
|
||||
|
||||
/* Allow a modeset change for the first commit only. */
|
||||
flags &= ~(DRM_MODE_ATOMIC_ALLOW_MODESET);
|
||||
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/***************************************/
|
||||
/* End of Atomic functions block */
|
||||
/***************************************/
|
||||
|
|
|
|||
|
|
@ -874,8 +874,11 @@ KMSDRM_VideoInit(_THIS)
|
|||
}
|
||||
}
|
||||
|
||||
/* Initialize the fence fd: */
|
||||
/* Initialize the fences and their fds: */
|
||||
dispdata->kms_fence = NULL;
|
||||
dispdata->gpu_fence = NULL;
|
||||
dispdata->kms_out_fence_fd = -1,
|
||||
dispdata->kms_in_fence_fd = -1,
|
||||
|
||||
/*********************/
|
||||
/* Atomic block ends */
|
||||
|
|
|
|||
|
|
@ -34,6 +34,7 @@
|
|||
#include <assert.h>
|
||||
#if SDL_VIDEO_OPENGL_EGL
|
||||
#include <EGL/egl.h>
|
||||
#include <EGL/eglext.h>
|
||||
#endif
|
||||
|
||||
typedef struct SDL_VideoData
|
||||
|
|
@ -75,9 +76,13 @@ typedef struct SDL_DisplayData
|
|||
drmModePropertyRes **connector_props_info;
|
||||
|
||||
int crtc_index;
|
||||
|
||||
int kms_in_fence_fd;
|
||||
int kms_out_fence_fd;
|
||||
|
||||
EGLSyncKHR kms_fence; /* Signaled when kms completes changes requested in atomic iotcl (pageflip, etc). */
|
||||
EGLSyncKHR gpu_fence; /* Signaled when GPU rendering is done. */
|
||||
|
||||
} SDL_DisplayData;
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue