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mpv/video/out/gl_w32.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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*
* You can alternatively redistribute this file 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.
*/
#include <assert.h>
#include <windows.h>
#include "w32_common.h"
#include "gl_common.h"
typedef HRESULT (WINAPI *DwmFlush_t)(void);
struct w32_context {
HGLRC context;
HDC hdc;
int flags;
HINSTANCE dwmapi_dll;
DwmFlush_t dwmflush;
};
static bool create_dc(struct MPGLContext *ctx, int flags)
{
struct w32_context *w32_ctx = ctx->priv;
HWND win = vo_w32_hwnd(ctx->vo);
if (w32_ctx->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.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);
int pfmt = GetPixelFormat(hdc);
if (DescribePixelFormat(hdc, pfmt, sizeof(PIXELFORMATDESCRIPTOR), &pfd)) {
ctx->depth_r = pfd.cRedBits;
ctx->depth_g = pfd.cGreenBits;
ctx->depth_b = pfd.cBlueBits;
}
w32_ctx->hdc = hdc;
return true;
}
static void *w32gpa(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_w32_old(struct MPGLContext *ctx)
{
struct w32_context *w32_ctx = ctx->priv;
HDC windc = w32_ctx->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;
}
w32_ctx->context = context;
mpgl_load_functions(ctx->gl, w32gpa, NULL, ctx->vo->log);
return true;
}
static bool create_context_w32_gl3(struct MPGLContext *ctx)
{
struct w32_context *w32_ctx = ctx->priv;
HDC windc = w32_ctx->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)
= w32gpa((const GLubyte*)"wglGetExtensionsStringARB");
if (!wglGetExtensionsStringARB)
goto unsupported;
const char *wgl_exts = wglGetExtensionsStringARB(windc);
if (!strstr(wgl_exts, "WGL_ARB_create_context"))
goto unsupported;
HGLRC (GLAPIENTRY *wglCreateContextAttribsARB)(HDC hDC, HGLRC hShareContext,
const int *attribList)
= w32gpa((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;
}
w32_ctx->context = context;
/* update function pointers */
mpgl_load_functions(ctx->gl, w32gpa, NULL, ctx->vo->log);
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 MPGLContext *ctx = ptr;
struct w32_context *w32_ctx = ctx->priv;
if (!create_dc(ctx, w32_ctx->flags))
return;
create_context_w32_gl3(ctx);
if (!w32_ctx->context)
create_context_w32_old(ctx);
w32_ctx->dwmapi_dll = LoadLibrary(L"Dwmapi.dll");
if (w32_ctx->dwmapi_dll)
w32_ctx->dwmflush = (DwmFlush_t)GetProcAddress(w32_ctx->dwmapi_dll, "DwmFlush");
wglMakeCurrent(w32_ctx->hdc, NULL);
}
static bool config_window_w32(struct MPGLContext *ctx, int flags)
{
struct w32_context *w32_ctx = ctx->priv;
if (!vo_w32_config(ctx->vo, flags))
return false;
if (w32_ctx->context) // reuse existing context
return true;
w32_ctx->flags = flags;
vo_w32_run_on_thread(ctx->vo, create_ctx, ctx);
if (w32_ctx->context)
wglMakeCurrent(w32_ctx->hdc, w32_ctx->context);
return !!w32_ctx->context;
}
static void destroy_gl(void *ptr)
{
struct MPGLContext *ctx = ptr;
struct w32_context *w32_ctx = ctx->priv;
if (w32_ctx->context)
wglDeleteContext(w32_ctx->context);
w32_ctx->context = 0;
if (w32_ctx->hdc)
ReleaseDC(vo_w32_hwnd(ctx->vo), w32_ctx->hdc);
w32_ctx->hdc = NULL;
}
static void releaseGlContext_w32(MPGLContext *ctx)
{
struct w32_context *w32_ctx = ctx->priv;
if (w32_ctx->context)
wglMakeCurrent(w32_ctx->hdc, 0);
vo_w32_run_on_thread(ctx->vo, destroy_gl, ctx);
w32_ctx->dwmflush = NULL;
if (w32_ctx->dwmapi_dll)
FreeLibrary(w32_ctx->dwmapi_dll);
w32_ctx->dwmapi_dll = NULL;
}
static void swapGlBuffers_w32(MPGLContext *ctx)
{
struct w32_context *w32_ctx = ctx->priv;
SwapBuffers(w32_ctx->hdc);
}
// opt_dwmflush: 0 - never DwmFlush, 1 - only in windowed mode, 2 - always
// return: the current (applied if modified) SwapInterval value.
// DwmFlush waits on DWM vsync similar to SwapBuffers but a bit more noisy.
// SwapBuffers still needs to be called, but we SwapInterval(0) when DwmFLush is
// used (will get applied for the following SwapBuffers calls)
static int DwmFlush_w32(MPGLContext *ctx, int opt_dwmflush,
int opt_swapinterval, int current_swapinterval)
{
struct w32_context *w32_ctx = ctx->priv;
int new_swapinterval = opt_swapinterval; // default if we don't DwmFLush
if (w32_ctx->dwmflush &&
(opt_dwmflush == 2 || (opt_dwmflush == 1 && !ctx->vo->opts->fullscreen)) &&
S_OK == w32_ctx->dwmflush())
{
new_swapinterval = 0;
}
if ((new_swapinterval != current_swapinterval) && ctx->gl->SwapInterval) {
ctx->gl->SwapInterval(new_swapinterval);
MP_VERBOSE(ctx->vo, "DwmFlush: set SwapInterval(%d)\n", new_swapinterval);
}
return new_swapinterval;
}
void mpgl_set_backend_w32(MPGLContext *ctx)
{
ctx->priv = talloc_zero(ctx, struct w32_context);
ctx->config_window = config_window_w32;
ctx->releaseGlContext = releaseGlContext_w32;
ctx->swapGlBuffers = swapGlBuffers_w32;
ctx->vo_init = vo_w32_init;
ctx->vo_uninit = vo_w32_uninit;
ctx->vo_control = vo_w32_control;
ctx->DwmFlush = DwmFlush_w32;
}
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