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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 <sys/poll.h>
#include <time.h>
#include <unistd.h>
#include <gbm.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GL/gl.h>
#include "context.h"
#include "common/common.h"
#include "video/out/drm_common.h"
#define USE_MASTER 0
struct framebuffer
{
struct gbm_bo *bo;
int width, height;
int fd;
int 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 {
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;
};
static EGLConfig select_fb_config_egl(struct MPGLContext *ctx, bool es)
{
struct priv *p = ctx->priv;
const EGLint attributes[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 0,
EGL_DEPTH_SIZE, 1,
EGL_RENDERABLE_TYPE, es ? EGL_OPENGL_ES2_BIT : EGL_OPENGL_BIT,
EGL_NONE
};
EGLint config_count;
EGLConfig config;
if (!eglChooseConfig(p->egl.display, attributes, &config, 1, &config_count)) {
MP_FATAL(ctx->vo, "Failed to configure EGL.\n");
return NULL;
}
if (!config_count) {
MP_FATAL(ctx->vo, "Could not find EGL configuration!\n");
return NULL;
}
return config;
}
static bool init_egl(struct MPGLContext *ctx, bool es)
{
struct priv *p = ctx->priv;
MP_VERBOSE(ctx->vo, "Initializing EGL\n");
p->egl.display = eglGetDisplay(p->gbm.device);
if (p->egl.display == EGL_NO_DISPLAY) {
MP_ERR(ctx->vo, "Failed to get EGL display.\n");
return false;
}
if (!eglInitialize(p->egl.display, NULL, NULL)) {
MP_ERR(ctx->vo, "Failed to initialize EGL.\n");
return false;
}
if (!eglBindAPI(es ? EGL_OPENGL_ES_API : EGL_OPENGL_API)) {
MP_ERR(ctx->vo, "Failed to set EGL API version.\n");
return false;
}
EGLConfig config = select_fb_config_egl(ctx, es);
if (!config) {
MP_ERR(ctx->vo, "Failed to configure EGL.\n");
return false;
}
p->egl.context = eglCreateContext(p->egl.display, config, EGL_NO_CONTEXT, NULL);
if (!p->egl.context) {
MP_ERR(ctx->vo, "Failed to create EGL context.\n");
return false;
}
MP_VERBOSE(ctx->vo, "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->vo, "Failed to create EGL surface.\n");
return false;
}
return true;
}
static bool init_gbm(struct MPGLContext *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_BO_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(
const struct MPGLContext *ctx, struct gbm_bo *bo)
{
struct priv *p = ctx->priv;
p->fb.bo = bo;
p->fb.fd = p->kms->fd;
p->fb.width = gbm_bo_get_width(bo);
p->fb.height = gbm_bo_get_height(bo);
int stride = gbm_bo_get_stride(bo);
int handle = gbm_bo_get_handle(bo).u32;
int ret = drmModeAddFB(p->kms->fd, p->fb.width, p->fb.height,
24, 32, stride, handle, &p->fb.id);
if (ret) {
MP_ERR(ctx->vo, "Failed to create framebuffer: %s\n", mp_strerror(errno));
}
gbm_bo_set_user_data(bo, &p->fb, framebuffer_destroy_callback);
}
static void page_flipped(int fd, unsigned int frame, unsigned int sec,
unsigned int usec, void *data)
{
struct priv *p = data;
p->waiting_for_flip = false;
}
static bool crtc_setup(struct MPGLContext *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 MPGLContext *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 MPGLContext *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 MPGLContext *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 void drm_egl_uninit(MPGLContext *ctx)
{
struct priv *p = ctx->priv;
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 int drm_egl_init(struct MPGLContext *ctx, int flags)
{
if (ctx->vo->probing) {
MP_VERBOSE(ctx->vo, "DRM EGL backend can be activated only manually.\n");
return -1;
}
struct priv *p = ctx->priv;
p->kms = NULL;
p->old_crtc = NULL;
p->gbm.surface = NULL;
p->gbm.device = NULL;
p->active = false;
p->waiting_for_flip = false;
p->ev.version = DRM_EVENT_CONTEXT_VERSION;
p->ev.page_flip_handler = page_flipped;
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->vo, "Failed to set up VT switcher. Terminal switching will be unavailable.\n");
}
MP_VERBOSE(ctx->vo, "Initializing KMS\n");
p->kms = kms_create(ctx->vo->log);
if (!p->kms) {
MP_ERR(ctx->vo, "Failed to create KMS.\n");
return -1;
}
// TODO: arguments should be configurable
if (!kms_setup(p->kms, "/dev/dri/card0", -1, 0)) {
MP_ERR(ctx->vo, "Failed to configure KMS.\n");
return -1;
}
if (!init_gbm(ctx)) {
MP_ERR(ctx->vo, "Failed to setup GBM.\n");
return -1;
}
if (!init_egl(ctx, flags & VOFLAG_GLES)) {
MP_ERR(ctx->vo, "Failed to setup EGL.\n");
return -1;
}
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 -1;
}
const char *egl_exts = eglQueryString(p->egl.display, EGL_EXTENSIONS);
void *(*gpa)(const GLubyte*) = (void *(*)(const GLubyte*))eglGetProcAddress;
mpgl_load_functions(ctx->gl, gpa, egl_exts, ctx->vo->log);
ctx->native_display_type = "drm";
ctx->native_display = (void *)(intptr_t)p->kms->fd;
// required by gbm_surface_lock_front_buffer
eglSwapBuffers(p->egl.display, p->egl.surface);
MP_VERBOSE(ctx->vo, "Preparing framebuffer\n");
p->gbm.bo = gbm_surface_lock_front_buffer(p->gbm.surface);
if (!p->gbm.bo) {
MP_ERR(ctx->vo, "Failed to lock GBM surface.\n");
return -1;
}
update_framebuffer_from_bo(ctx, p->gbm.bo);
if (!p->fb.id) {
MP_ERR(ctx->vo, "Failed to create framebuffer.\n");
return -1;
}
if (!crtc_setup(ctx)) {
MP_ERR(
ctx->vo,
"Failed to set CRTC for connector %u: %s\n",
p->kms->connector->connector_id,
mp_strerror(errno));
return -1;
}
return 0;
}
static int drm_egl_reconfig(struct MPGLContext *ctx)
{
struct priv *p = ctx->priv;
ctx->vo->dwidth = p->fb.width;
ctx->vo->dheight = p->fb.height;
return 0;
}
static int drm_egl_control(struct MPGLContext *ctx, int *events, int request,
void *arg)
{
return VO_NOTIMPL;
}
static void drm_egl_swap_buffers(MPGLContext *ctx)
{
struct priv *p = ctx->priv;
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);
int 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);
return;
}
}
gbm_surface_release_buffer(p->gbm.surface, p->gbm.bo);
p->gbm.bo = p->gbm.next_bo;
}
const struct mpgl_driver mpgl_driver_drm_egl = {
.name = "drm-egl",
.priv_size = sizeof(struct priv),
.init = drm_egl_init,
.reconfig = drm_egl_reconfig,
.swap_buffers = drm_egl_swap_buffers,
.control = drm_egl_control,
.uninit = drm_egl_uninit,
};
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