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mpv/video/out/opengl/context_win.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 <windows.h>
#include <dwmapi.h>
#include "options/m_config.h"
#include "video/out/w32_common.h"
#include "context.h"
#include "utils.h"
#if !defined(WGL_CONTEXT_MAJOR_VERSION_ARB)
/* these are supposed to be defined in wingdi.h but mingw's is too old */
/* only the bits actually used by mplayer are defined */
/* reference: http://www.opengl.org/registry/specs/ARB/wgl_create_context.txt */
#define WGL_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define WGL_CONTEXT_MINOR_VERSION_ARB 0x2092
#define WGL_CONTEXT_FLAGS_ARB 0x2094
#define WGL_CONTEXT_PROFILE_MASK_ARB 0x9126
#define WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB 0x0002
#define WGL_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001
#endif
struct wingl_opts {
int wingl_dwm_flush;
};
#define OPT_BASE_STRUCT struct wingl_opts
const struct m_sub_options wingl_conf = {
.opts = (const struct m_option[]) {
{"opengl-dwmflush", OPT_CHOICE(wingl_dwm_flush,
{"no", -1}, {"auto", 0}, {"windowed", 1}, {"yes", 2})},
{0}
},
.size = sizeof(struct wingl_opts),
};
struct priv {
GL gl;
int opt_swapinterval;
int current_swapinterval;
int (GLAPIENTRY *real_wglSwapInterval)(int);
struct m_config_cache *opts_cache;
struct wingl_opts *opts;
HGLRC context;
HDC hdc;
};
static void wgl_uninit(struct ra_ctx *ctx);
static __thread struct priv *current_wgl_context;
static int GLAPIENTRY wgl_swap_interval(int interval)
{
if (current_wgl_context)
current_wgl_context->opt_swapinterval = interval;
return 0;
}
static bool create_dc(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
HWND win = vo_w32_hwnd(ctx->vo);
if (p->hdc)
return true;
HDC hdc = GetDC(win);
if (!hdc)
return false;
PIXELFORMATDESCRIPTOR pfd;
memset(&pfd, 0, sizeof pfd);
pfd.nSize = sizeof pfd;
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cAlphaBits = 8;
pfd.iLayerType = PFD_MAIN_PLANE;
int pf = ChoosePixelFormat(hdc, &pfd);
if (!pf) {
MP_ERR(ctx->vo, "unable to select a valid pixel format!\n");
ReleaseDC(win, hdc);
return false;
}
SetPixelFormat(hdc, pf, &pfd);
p->hdc = hdc;
return true;
}
static void *wglgpa(const GLubyte *procName)
{
HMODULE oglmod;
void *res = wglGetProcAddress(procName);
if (res)
return res;
oglmod = GetModuleHandle(L"opengl32.dll");
return GetProcAddress(oglmod, procName);
}
static bool create_context_wgl_old(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
HDC windc = p->hdc;
bool res = false;
HGLRC context = wglCreateContext(windc);
if (!context) {
MP_FATAL(ctx->vo, "Could not create GL context!\n");
return res;
}
if (!wglMakeCurrent(windc, context)) {
MP_FATAL(ctx->vo, "Could not set GL context!\n");
wglDeleteContext(context);
return res;
}
p->context = context;
return true;
}
static bool create_context_wgl_gl3(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
HDC windc = p->hdc;
HGLRC context = 0;
// A legacy context is needed to get access to the new functions.
HGLRC legacy_context = wglCreateContext(windc);
if (!legacy_context) {
MP_FATAL(ctx->vo, "Could not create GL context!\n");
return false;
}
// set context
if (!wglMakeCurrent(windc, legacy_context)) {
MP_FATAL(ctx->vo, "Could not set GL context!\n");
goto out;
}
const char *(GLAPIENTRY *wglGetExtensionsStringARB)(HDC hdc)
= wglgpa((const GLubyte*)"wglGetExtensionsStringARB");
if (!wglGetExtensionsStringARB)
goto unsupported;
const char *wgl_exts = wglGetExtensionsStringARB(windc);
if (!gl_check_extension(wgl_exts, "WGL_ARB_create_context"))
goto unsupported;
HGLRC (GLAPIENTRY *wglCreateContextAttribsARB)(HDC hDC, HGLRC hShareContext,
const int *attribList)
= wglgpa((const GLubyte*)"wglCreateContextAttribsARB");
if (!wglCreateContextAttribsARB)
goto unsupported;
int attribs[] = {
WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
WGL_CONTEXT_MINOR_VERSION_ARB, 0,
WGL_CONTEXT_FLAGS_ARB, 0,
WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
0
};
context = wglCreateContextAttribsARB(windc, 0, attribs);
if (!context) {
// NVidia, instead of ignoring WGL_CONTEXT_FLAGS_ARB, will error out if
// it's present on pre-3.2 contexts.
// Remove it from attribs and retry the context creation.
attribs[6] = attribs[7] = 0;
context = wglCreateContextAttribsARB(windc, 0, attribs);
}
if (!context) {
int err = GetLastError();
MP_FATAL(ctx->vo, "Could not create an OpenGL 3.x context: error 0x%x\n", err);
goto out;
}
wglMakeCurrent(windc, NULL);
wglDeleteContext(legacy_context);
if (!wglMakeCurrent(windc, context)) {
MP_FATAL(ctx->vo, "Could not set GL3 context!\n");
wglDeleteContext(context);
return false;
}
p->context = context;
return true;
unsupported:
MP_ERR(ctx->vo, "The OpenGL driver does not support OpenGL 3.x \n");
out:
wglMakeCurrent(windc, NULL);
wglDeleteContext(legacy_context);
return false;
}
static void create_ctx(void *ptr)
{
struct ra_ctx *ctx = ptr;
struct priv *p = ctx->priv;
if (!create_dc(ctx))
return;
create_context_wgl_gl3(ctx);
if (!p->context)
create_context_wgl_old(ctx);
wglMakeCurrent(p->hdc, NULL);
}
static bool compositor_active(struct ra_ctx *ctx)
{
// For Windows 7.
BOOL enabled = 0;
if (FAILED(DwmIsCompositionEnabled(&enabled)) || !enabled)
return false;
// This works at least on Windows 8.1: it returns an error in fullscreen,
// which is also when we get consistent timings without DwmFlush. Might
// be cargo-cult.
DWM_TIMING_INFO info = { .cbSize = sizeof(DWM_TIMING_INFO) };
if (FAILED(DwmGetCompositionTimingInfo(0, &info)))
return false;
return true;
}
static void wgl_swap_buffers(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
SwapBuffers(p->hdc);
// default if we don't DwmFLush
int new_swapinterval = p->opt_swapinterval;
if (p->opts->wingl_dwm_flush >= 0) {
if ((p->opts->wingl_dwm_flush == 1 && !ctx->vo->opts->fullscreen) ||
(p->opts->wingl_dwm_flush == 2) ||
(p->opts->wingl_dwm_flush == 0 && compositor_active(ctx)))
{
if (DwmFlush() == S_OK)
new_swapinterval = 0;
}
}
if (new_swapinterval != p->current_swapinterval &&
p->real_wglSwapInterval)
{
p->real_wglSwapInterval(new_swapinterval);
MP_VERBOSE(ctx->vo, "set SwapInterval(%d)\n", new_swapinterval);
}
p->current_swapinterval = new_swapinterval;
}
static bool wgl_init(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv = talloc_zero(ctx, struct priv);
GL *gl = &p->gl;
p->opts_cache = m_config_cache_alloc(ctx, ctx->global, &wingl_conf);
p->opts = p->opts_cache->opts;
if (!vo_w32_init(ctx->vo))
goto fail;
if (ctx->opts.want_alpha)
vo_w32_set_transparency(ctx->vo, ctx->opts.want_alpha);
vo_w32_run_on_thread(ctx->vo, create_ctx, ctx);
if (!p->context)
goto fail;
current_wgl_context = p;
wglMakeCurrent(p->hdc, p->context);
mpgl_load_functions(gl, wglgpa, NULL, ctx->vo->log);
if (!gl->SwapInterval)
MP_VERBOSE(ctx->vo, "WGL_EXT_swap_control missing.\n");
p->real_wglSwapInterval = gl->SwapInterval;
gl->SwapInterval = wgl_swap_interval;
p->current_swapinterval = -1;
struct ra_gl_ctx_params params = {
.swap_buffers = wgl_swap_buffers,
};
if (!ra_gl_ctx_init(ctx, gl, params))
goto fail;
DwmEnableMMCSS(TRUE);
return true;
fail:
wgl_uninit(ctx);
return false;
}
static void resize(struct ra_ctx *ctx)
{
ra_gl_ctx_resize(ctx->swapchain, ctx->vo->dwidth, ctx->vo->dheight, 0);
}
static bool wgl_reconfig(struct ra_ctx *ctx)
{
vo_w32_config(ctx->vo);
resize(ctx);
return true;
}
static void destroy_gl(void *ptr)
{
struct ra_ctx *ctx = ptr;
struct priv *p = ctx->priv;
if (p->context)
wglDeleteContext(p->context);
p->context = 0;
if (p->hdc)
ReleaseDC(vo_w32_hwnd(ctx->vo), p->hdc);
p->hdc = NULL;
current_wgl_context = NULL;
}
static void wgl_uninit(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
ra_gl_ctx_uninit(ctx);
if (p->context)
wglMakeCurrent(p->hdc, 0);
vo_w32_run_on_thread(ctx->vo, destroy_gl, ctx);
DwmEnableMMCSS(FALSE);
vo_w32_uninit(ctx->vo);
}
static int wgl_control(struct ra_ctx *ctx, int *events, int request, void *arg)
{
int ret = vo_w32_control(ctx->vo, events, request, arg);
if (*events & VO_EVENT_RESIZE)
resize(ctx);
return ret;
}
static void wgl_update_render_opts(struct ra_ctx *ctx)
{
vo_w32_set_transparency(ctx->vo, ctx->opts.want_alpha);
}
const struct ra_ctx_fns ra_ctx_wgl = {
.type = "opengl",
.name = "win",
.description = "Win32/WGL",
.init = wgl_init,
.reconfig = wgl_reconfig,
.control = wgl_control,
.update_render_opts = wgl_update_render_opts,
.uninit = wgl_uninit,
};
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