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mpv/video/out/opengl/context_drm_egl.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <string.h>
#include <poll.h>
#include <time.h>
#include <unistd.h>
#include <gbm.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include "libmpv/opengl_cb.h"
#include "video/out/drm_common.h"
#include "common/common.h"
#include "egl_helpers.h"
#include "common.h"
#include "context.h"
#define USE_MASTER 0
struct framebuffer
{
int fd;
uint32_t width, height;
uint32_t id;
};
struct gbm
{
struct gbm_surface *surface;
struct gbm_device *device;
struct gbm_bo *bo;
struct gbm_bo *next_bo;
};
struct egl
{
EGLDisplay display;
EGLContext context;
EGLSurface surface;
};
struct priv {
GL gl;
struct kms *kms;
drmEventContext ev;
drmModeCrtc *old_crtc;
struct egl egl;
struct gbm gbm;
struct framebuffer *fb;
bool active;
bool waiting_for_flip;
bool vt_switcher_active;
struct vt_switcher vt_switcher;
struct mpv_opengl_cb_drm_params drm_params;
};
static bool init_egl(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
MP_VERBOSE(ctx, "Initializing EGL\n");
p->egl.display = eglGetDisplay(p->gbm.device);
if (p->egl.display == EGL_NO_DISPLAY) {
MP_ERR(ctx, "Failed to get EGL display.\n");
return false;
}
if (!eglInitialize(p->egl.display, NULL, NULL)) {
MP_ERR(ctx, "Failed to initialize EGL.\n");
return false;
}
EGLConfig config;
if (!mpegl_create_context(ctx, p->egl.display, &p->egl.context, &config))
return false;
MP_VERBOSE(ctx, "Initializing EGL surface\n");
p->egl.surface
= eglCreateWindowSurface(p->egl.display, config, p->gbm.surface, NULL);
if (p->egl.surface == EGL_NO_SURFACE) {
MP_ERR(ctx, "Failed to create EGL surface.\n");
return false;
}
return true;
}
static bool init_gbm(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
MP_VERBOSE(ctx->vo, "Creating GBM device\n");
p->gbm.device = gbm_create_device(p->kms->fd);
if (!p->gbm.device) {
MP_ERR(ctx->vo, "Failed to create GBM device.\n");
return false;
}
MP_VERBOSE(ctx->vo, "Initializing GBM surface (%d x %d)\n",
p->kms->mode.hdisplay, p->kms->mode.vdisplay);
p->gbm.surface = gbm_surface_create(
p->gbm.device,
p->kms->mode.hdisplay,
p->kms->mode.vdisplay,
GBM_FORMAT_XRGB8888,
GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
if (!p->gbm.surface) {
MP_ERR(ctx->vo, "Failed to create GBM surface.\n");
return false;
}
return true;
}
static void framebuffer_destroy_callback(struct gbm_bo *bo, void *data)
{
struct framebuffer *fb = data;
if (fb) {
drmModeRmFB(fb->fd, fb->id);
}
}
static void update_framebuffer_from_bo(struct ra_ctx *ctx, struct gbm_bo *bo)
{
struct priv *p = ctx->priv;
struct framebuffer *fb = gbm_bo_get_user_data(bo);
if (fb) {
p->fb = fb;
return;
}
fb = talloc_zero(ctx, struct framebuffer);
fb->fd = p->kms->fd;
fb->width = gbm_bo_get_width(bo);
fb->height = gbm_bo_get_height(bo);
uint32_t stride = gbm_bo_get_stride(bo);
uint32_t handle = gbm_bo_get_handle(bo).u32;
int ret = drmModeAddFB(fb->fd, fb->width, fb->height,
32, 32, stride, handle, &fb->id);
if (ret) {
MP_ERR(ctx->vo, "Failed to create framebuffer: %s\n", mp_strerror(errno));
}
gbm_bo_set_user_data(bo, fb, framebuffer_destroy_callback);
p->fb = fb;
}
static bool crtc_setup(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
if (p->active)
return true;
p->old_crtc = drmModeGetCrtc(p->kms->fd, p->kms->crtc_id);
int ret = drmModeSetCrtc(p->kms->fd, p->kms->crtc_id, p->fb->id,
0, 0, &p->kms->connector->connector_id, 1,
&p->kms->mode);
p->active = true;
return ret == 0;
}
static void crtc_release(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
if (!p->active)
return;
p->active = false;
// wait for current page flip
while (p->waiting_for_flip) {
int ret = drmHandleEvent(p->kms->fd, &p->ev);
if (ret) {
MP_ERR(ctx->vo, "drmHandleEvent failed: %i\n", ret);
break;
}
}
if (p->old_crtc) {
drmModeSetCrtc(p->kms->fd,
p->old_crtc->crtc_id, p->old_crtc->buffer_id,
p->old_crtc->x, p->old_crtc->y,
&p->kms->connector->connector_id, 1,
&p->old_crtc->mode);
drmModeFreeCrtc(p->old_crtc);
p->old_crtc = NULL;
}
}
static void release_vt(void *data)
{
struct ra_ctx *ctx = data;
MP_VERBOSE(ctx->vo, "Releasing VT");
crtc_release(ctx);
if (USE_MASTER) {
//this function enables support for switching to x, weston etc.
//however, for whatever reason, it can be called only by root users.
//until things change, this is commented.
struct priv *p = ctx->priv;
if (drmDropMaster(p->kms->fd)) {
MP_WARN(ctx->vo, "Failed to drop DRM master: %s\n",
mp_strerror(errno));
}
}
}
static void acquire_vt(void *data)
{
struct ra_ctx *ctx = data;
MP_VERBOSE(ctx->vo, "Acquiring VT");
if (USE_MASTER) {
struct priv *p = ctx->priv;
if (drmSetMaster(p->kms->fd)) {
MP_WARN(ctx->vo, "Failed to acquire DRM master: %s\n",
mp_strerror(errno));
}
}
crtc_setup(ctx);
}
static bool drm_atomic_egl_start_frame(struct ra_swapchain *sw, struct ra_fbo *out_fbo)
{
struct priv *p = sw->ctx->priv;
if (p->kms->atomic_context) {
p->kms->atomic_context->request = drmModeAtomicAlloc();
p->drm_params.atomic_request = p->kms->atomic_context->request;
return ra_gl_ctx_start_frame(sw, out_fbo);
}
return false;
}
static const struct ra_swapchain_fns drm_atomic_swapchain = {
.start_frame = drm_atomic_egl_start_frame,
};
static void drm_egl_swap_buffers(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
struct drm_atomic_context *atomic_ctx = p->kms->atomic_context;
int ret;
eglSwapBuffers(p->egl.display, p->egl.surface);
p->gbm.next_bo = gbm_surface_lock_front_buffer(p->gbm.surface);
p->waiting_for_flip = true;
update_framebuffer_from_bo(ctx, p->gbm.next_bo);
if (atomic_ctx) {
drm_object_set_property(atomic_ctx->request, atomic_ctx->primary_plane, "FB_ID", p->fb->id);
drm_object_set_property(atomic_ctx->request, atomic_ctx->primary_plane, "CRTC_ID", atomic_ctx->crtc->id);
drm_object_set_property(atomic_ctx->request, atomic_ctx->primary_plane, "ZPOS", 1);
ret = drmModeAtomicCommit(p->kms->fd, atomic_ctx->request,
DRM_MODE_ATOMIC_NONBLOCK | DRM_MODE_PAGE_FLIP_EVENT, NULL);
if (ret)
MP_WARN(ctx->vo, "Failed to commit atomic request (%d)\n", ret);
} else {
ret = drmModePageFlip(p->kms->fd, p->kms->crtc_id, p->fb->id,
DRM_MODE_PAGE_FLIP_EVENT, p);
if (ret) {
MP_WARN(ctx->vo, "Failed to queue page flip: %s\n", mp_strerror(errno));
}
}
// poll page flip finish event
const int timeout_ms = 3000;
struct pollfd fds[1] = { { .events = POLLIN, .fd = p->kms->fd } };
poll(fds, 1, timeout_ms);
if (fds[0].revents & POLLIN) {
ret = drmHandleEvent(p->kms->fd, &p->ev);
if (ret != 0) {
MP_ERR(ctx->vo, "drmHandleEvent failed: %i\n", ret);
p->waiting_for_flip = false;
return;
}
}
p->waiting_for_flip = false;
if (atomic_ctx) {
drmModeAtomicFree(atomic_ctx->request);
p->drm_params.atomic_request = atomic_ctx->request = NULL;
}
gbm_surface_release_buffer(p->gbm.surface, p->gbm.bo);
p->gbm.bo = p->gbm.next_bo;
}
static void drm_egl_uninit(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
ra_gl_ctx_uninit(ctx);
crtc_release(ctx);
if (p->vt_switcher_active)
vt_switcher_destroy(&p->vt_switcher);
eglMakeCurrent(p->egl.display, EGL_NO_SURFACE, EGL_NO_SURFACE,
EGL_NO_CONTEXT);
eglDestroyContext(p->egl.display, p->egl.context);
eglDestroySurface(p->egl.display, p->egl.surface);
gbm_surface_destroy(p->gbm.surface);
eglTerminate(p->egl.display);
gbm_device_destroy(p->gbm.device);
p->egl.context = EGL_NO_CONTEXT;
eglDestroyContext(p->egl.display, p->egl.context);
if (p->kms) {
kms_destroy(p->kms);
p->kms = 0;
}
}
static bool drm_egl_init(struct ra_ctx *ctx)
{
if (ctx->opts.probing) {
MP_VERBOSE(ctx, "DRM EGL backend can be activated only manually.\n");
return false;
}
struct priv *p = ctx->priv = talloc_zero(ctx, struct priv);
p->ev.version = DRM_EVENT_CONTEXT_VERSION;
p->vt_switcher_active = vt_switcher_init(&p->vt_switcher, ctx->vo->log);
if (p->vt_switcher_active) {
vt_switcher_acquire(&p->vt_switcher, acquire_vt, ctx);
vt_switcher_release(&p->vt_switcher, release_vt, ctx);
} else {
MP_WARN(ctx, "Failed to set up VT switcher. Terminal switching will be unavailable.\n");
}
MP_VERBOSE(ctx, "Initializing KMS\n");
p->kms = kms_create(ctx->log, ctx->vo->opts->drm_opts->drm_connector_spec,
ctx->vo->opts->drm_opts->drm_mode_id,
ctx->vo->opts->drm_opts->drm_overlay_id);
if (!p->kms) {
MP_ERR(ctx, "Failed to create KMS.\n");
return false;
}
if (!init_gbm(ctx)) {
MP_ERR(ctx->vo, "Failed to setup GBM.\n");
return false;
}
if (!init_egl(ctx)) {
MP_ERR(ctx->vo, "Failed to setup EGL.\n");
return false;
}
if (!eglMakeCurrent(p->egl.display, p->egl.surface, p->egl.surface,
p->egl.context)) {
MP_ERR(ctx->vo, "Failed to make context current.\n");
return false;
}
mpegl_load_functions(&p->gl, ctx->vo->log);
// required by gbm_surface_lock_front_buffer
eglSwapBuffers(p->egl.display, p->egl.surface);
MP_VERBOSE(ctx, "Preparing framebuffer\n");
p->gbm.bo = gbm_surface_lock_front_buffer(p->gbm.surface);
if (!p->gbm.bo) {
MP_ERR(ctx, "Failed to lock GBM surface.\n");
return false;
}
update_framebuffer_from_bo(ctx, p->gbm.bo);
if (!p->fb || !p->fb->id) {
MP_ERR(ctx, "Failed to create framebuffer.\n");
return false;
}
if (!crtc_setup(ctx)) {
MP_ERR(ctx, "Failed to set CRTC for connector %u: %s\n",
p->kms->connector->connector_id, mp_strerror(errno));
return false;
}
p->drm_params.fd = p->kms->fd;
p->drm_params.crtc_id = p->kms->crtc_id;
p->drm_params.atomic_request = p->kms->atomic_context->request;
struct ra_gl_ctx_params params = {
.swap_buffers = drm_egl_swap_buffers,
.native_display_type = "opengl-cb-drm-params",
.native_display = &p->drm_params,
.external_swapchain = p->kms->atomic_context ? &drm_atomic_swapchain :
NULL,
};
if (!ra_gl_ctx_init(ctx, &p->gl, params))
return false;
return true;
}
static bool drm_egl_reconfig(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
ctx->vo->dwidth = p->fb->width;
ctx->vo->dheight = p->fb->height;
ra_gl_ctx_resize(ctx->swapchain, p->fb->width, p->fb->height, 0);
return true;
}
static int drm_egl_control(struct ra_ctx *ctx, int *events, int request,
void *arg)
{
struct priv *p = ctx->priv;
switch (request) {
case VOCTRL_GET_DISPLAY_FPS: {
double fps = kms_get_display_fps(p->kms);
if (fps <= 0)
break;
*(double*)arg = fps;
return VO_TRUE;
}
}
return VO_NOTIMPL;
}
const struct ra_ctx_fns ra_ctx_drm_egl = {
.type = "opengl",
.name = "drm",
.reconfig = drm_egl_reconfig,
.control = drm_egl_control,
.init = drm_egl_init,
.uninit = drm_egl_uninit,
};
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