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mpv/video/out/opengl/context_rpi.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 <stdatomic.h>
#include <stddef.h>
#include <bcm_host.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include "common/common.h"
#include "video/out/win_state.h"
#include "context.h"
#include "egl_helpers.h"
struct priv {
struct GL gl;
DISPMANX_DISPLAY_HANDLE_T display;
DISPMANX_ELEMENT_HANDLE_T window;
DISPMANX_UPDATE_HANDLE_T update;
EGLDisplay egl_display;
EGLConfig egl_config;
EGLContext egl_context;
EGLSurface egl_surface;
// yep, the API keeps a pointer to it
EGL_DISPMANX_WINDOW_T egl_window;
int x, y, w, h;
double display_fps;
atomic_int reload_display;
int win_params[4];
};
static void tv_callback(void *callback_data, uint32_t reason, uint32_t param1,
uint32_t param2)
{
struct ra_ctx *ctx = callback_data;
struct priv *p = ctx->priv;
atomic_store(&p->reload_display, true);
vo_wakeup(ctx->vo);
}
static void destroy_dispmanx(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
if (p->egl_surface) {
eglMakeCurrent(p->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
EGL_NO_CONTEXT);
eglDestroySurface(p->egl_display, p->egl_surface);
p->egl_surface = EGL_NO_SURFACE;
}
if (p->window)
vc_dispmanx_element_remove(p->update, p->window);
p->window = 0;
if (p->display)
vc_dispmanx_display_close(p->display);
p->display = 0;
if (p->update)
vc_dispmanx_update_submit_sync(p->update);
p->update = 0;
}
static void rpi_uninit(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
ra_gl_ctx_uninit(ctx);
vc_tv_unregister_callback_full(tv_callback, ctx);
destroy_dispmanx(ctx);
if (p->egl_context)
eglDestroyContext(p->egl_display, p->egl_context);
p->egl_context = EGL_NO_CONTEXT;
eglReleaseThread();
p->egl_display = EGL_NO_DISPLAY;
}
static bool recreate_dispmanx(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
int display_nr = 0;
int layer = 0;
MP_VERBOSE(ctx, "Recreating DISPMANX state...\n");
destroy_dispmanx(ctx);
p->display = vc_dispmanx_display_open(display_nr);
p->update = vc_dispmanx_update_start(0);
if (!p->display || !p->update) {
MP_FATAL(ctx, "Could not get DISPMANX objects.\n");
goto fail;
}
uint32_t dispw, disph;
if (graphics_get_display_size(0, &dispw, &disph) < 0) {
MP_FATAL(ctx, "Could not get display size.\n");
goto fail;
}
p->w = dispw;
p->h = disph;
if (ctx->vo->opts->fullscreen) {
p->x = p->y = 0;
} else {
struct vo_win_geometry geo;
struct mp_rect screenrc = {0, 0, p->w, p->h};
vo_calc_window_geometry(ctx->vo, &screenrc, &geo);
mp_rect_intersection(&geo.win, &screenrc);
p->x = geo.win.x0;
p->y = geo.win.y0;
p->w = geo.win.x1 - geo.win.x0;
p->h = geo.win.y1 - geo.win.y0;
}
// dispmanx is like a neanderthal version of Wayland - you can add an
// overlay any place on the screen.
VC_RECT_T dst = {.x = p->x, .y = p->y, .width = p->w, .height = p->h};
VC_RECT_T src = {.width = p->w << 16, .height = p->h << 16};
VC_DISPMANX_ALPHA_T alpha = {
.flags = DISPMANX_FLAGS_ALPHA_FIXED_ALL_PIXELS,
.opacity = 0xFF,
};
p->window = vc_dispmanx_element_add(p->update, p->display, layer, &dst, 0,
&src, DISPMANX_PROTECTION_NONE, &alpha,
0, 0);
if (!p->window) {
MP_FATAL(ctx, "Could not add DISPMANX element.\n");
goto fail;
}
vc_dispmanx_update_submit_sync(p->update);
p->update = vc_dispmanx_update_start(0);
p->egl_window = (EGL_DISPMANX_WINDOW_T){
.element = p->window,
.width = p->w,
.height = p->h,
};
p->egl_surface = eglCreateWindowSurface(p->egl_display, p->egl_config,
&p->egl_window, NULL);
if (p->egl_surface == EGL_NO_SURFACE) {
MP_FATAL(ctx, "Could not create EGL surface!\n");
goto fail;
}
if (!eglMakeCurrent(p->egl_display, p->egl_surface, p->egl_surface,
p->egl_context))
{
MP_FATAL(ctx, "Failed to set context!\n");
goto fail;
}
p->display_fps = 0;
TV_GET_STATE_RESP_T tvstate;
TV_DISPLAY_STATE_T tvstate_disp;
if (!vc_tv_get_state(&tvstate) && !vc_tv_get_display_state(&tvstate_disp)) {
if (tvstate_disp.state & (VC_HDMI_HDMI | VC_HDMI_DVI)) {
p->display_fps = tvstate_disp.display.hdmi.frame_rate;
HDMI_PROPERTY_PARAM_T param = {
.property = HDMI_PROPERTY_PIXEL_CLOCK_TYPE,
};
if (!vc_tv_hdmi_get_property(&param) &&
param.param1 == HDMI_PIXEL_CLOCK_TYPE_NTSC)
p->display_fps = p->display_fps / 1.001;
} else {
p->display_fps = tvstate_disp.display.sdtv.frame_rate;
}
}
p->win_params[0] = display_nr;
p->win_params[1] = layer;
p->win_params[2] = p->x;
p->win_params[3] = p->y;
ctx->vo->dwidth = p->w;
ctx->vo->dheight = p->h;
if (ctx->swapchain)
ra_gl_ctx_resize(ctx->swapchain, p->w, p->h, 0);
ctx->vo->want_redraw = true;
vo_event(ctx->vo, VO_EVENT_WIN_STATE);
return true;
fail:
destroy_dispmanx(ctx);
return false;
}
static void rpi_swap_buffers(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
eglSwapBuffers(p->egl_display, p->egl_surface);
}
static bool rpi_init(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv = talloc_zero(ctx, struct priv);
bcm_host_init();
vc_tv_register_callback(tv_callback, ctx);
p->egl_display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
if (!eglInitialize(p->egl_display, NULL, NULL)) {
MP_FATAL(ctx, "EGL failed to initialize.\n");
goto fail;
}
if (!mpegl_create_context(ctx, p->egl_display, &p->egl_context, &p->egl_config))
goto fail;
if (!recreate_dispmanx(ctx))
goto fail;
mpegl_load_functions(&p->gl, ctx->log);
struct ra_gl_ctx_params params = {
.swap_buffers = rpi_swap_buffers,
};
if (!ra_gl_ctx_init(ctx, &p->gl, params))
goto fail;
ra_add_native_resource(ctx->ra, "MPV_RPI_WINDOW", p->win_params);
ra_gl_ctx_resize(ctx->swapchain, ctx->vo->dwidth, ctx->vo->dheight, 0);
return true;
fail:
rpi_uninit(ctx);
return false;
}
static bool rpi_reconfig(struct ra_ctx *ctx)
{
return recreate_dispmanx(ctx);
}
static struct mp_image *take_screenshot(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
if (!p->display)
return NULL;
struct mp_image *img = mp_image_alloc(IMGFMT_BGR0, p->w, p->h);
if (!img)
return NULL;
DISPMANX_RESOURCE_HANDLE_T resource =
vc_dispmanx_resource_create(VC_IMAGE_ARGB8888,
img->w | ((img->w * 4) << 16), img->h,
&(int32_t){0});
if (!resource)
goto fail;
if (vc_dispmanx_snapshot(p->display, resource, 0))
goto fail;
VC_RECT_T rc = {.width = img->w, .height = img->h};
if (vc_dispmanx_resource_read_data(resource, &rc, img->planes[0], img->stride[0]))
goto fail;
vc_dispmanx_resource_delete(resource);
return img;
fail:
vc_dispmanx_resource_delete(resource);
talloc_free(img);
return NULL;
}
static int rpi_control(struct ra_ctx *ctx, int *events, int request, void *arg)
{
struct priv *p = ctx->priv;
switch (request) {
case VOCTRL_SCREENSHOT_WIN:
*(struct mp_image **)arg = take_screenshot(ctx);
return VO_TRUE;
case VOCTRL_CHECK_EVENTS:
if (atomic_fetch_and(&p->reload_display, 0)) {
MP_WARN(ctx, "Recovering from display mode switch...\n");
recreate_dispmanx(ctx);
}
return VO_TRUE;
case VOCTRL_GET_DISPLAY_FPS:
*(double *)arg = p->display_fps;
return VO_TRUE;
}
return VO_NOTIMPL;
}
const struct ra_ctx_fns ra_ctx_rpi = {
.type = "opengl",
.name = "rpi",
.reconfig = rpi_reconfig,
.control = rpi_control,
.init = rpi_init,
.uninit = rpi_uninit,
};
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