1 files changed, 349 insertions, 0 deletions

diff --git a/video/out/opengl/context_w32.c b/video/out/opengl/context_w32.c
new file mode 100644
index 0000000000..5157cd97a5
--- /dev/null
+++ b/video/out/opengl/context_w32.c
@@ -0,0 +1,349 @@
+/*
+ * 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 <dwmapi.h>
+#include "video/out/w32_common.h"
+#include "video/out/win32/exclusive_hack.h"
+#include "context.h"
+
+struct w32_context {
+    int opt_swapinterval;
+    int current_swapinterval;
+
+    int (GLAPIENTRY *real_wglSwapInterval)(int);
+
+    HGLRC context;
+    HDC hdc;
+    int flags;
+};
+
+static void w32_uninit(MPGLContext *ctx);
+
+static __thread struct w32_context *current_w32_context;
+
+static int GLAPIENTRY w32_swap_interval(int interval)
+{
+    if (current_w32_context)
+        current_w32_context->opt_swapinterval = interval;
+    return 0;
+}
+
+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);
+
+    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);
+
+    int pfmt = GetPixelFormat(w32_ctx->hdc);
+    PIXELFORMATDESCRIPTOR pfd;
+    if (DescribePixelFormat(w32_ctx->hdc, pfmt, sizeof(pfd), &pfd)) {
+        ctx->gl->fb_r = pfd.cRedBits;
+        ctx->gl->fb_g = pfd.cGreenBits;
+        ctx->gl->fb_b = pfd.cBlueBits;
+    }
+
+    wglMakeCurrent(w32_ctx->hdc, NULL);
+}
+
+static int w32_init(struct MPGLContext *ctx, int flags)
+{
+    if (!vo_w32_init(ctx->vo))
+        goto fail;
+
+    struct w32_context *w32_ctx = ctx->priv;
+
+    w32_ctx->flags = flags;
+    vo_w32_run_on_thread(ctx->vo, create_ctx, ctx);
+
+    if (!w32_ctx->context)
+        goto fail;
+
+    if (!ctx->gl->SwapInterval)
+        MP_VERBOSE(ctx->vo, "WGL_EXT_swap_control missing.\n");
+    w32_ctx->real_wglSwapInterval = ctx->gl->SwapInterval;
+    ctx->gl->SwapInterval = w32_swap_interval;
+    w32_ctx->current_swapinterval = -1;
+
+    current_w32_context = w32_ctx;
+    wglMakeCurrent(w32_ctx->hdc, w32_ctx->context);
+    DwmEnableMMCSS(TRUE);
+    return 0;
+
+fail:
+    w32_uninit(ctx);
+    return -1;
+}
+
+static int w32_reconfig(struct MPGLContext *ctx)
+{
+    vo_w32_config(ctx->vo);
+    return 0;
+}
+
+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;
+    current_w32_context = NULL;
+}
+
+static void w32_uninit(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);
+
+    DwmEnableMMCSS(FALSE);
+    vo_w32_uninit(ctx->vo);
+}
+
+static bool compositor_active(MPGLContext *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;
+
+    // Test if a program is running in exclusive fullscreen mode. If so, it's
+    // probably this one, so it's not getting redirected by the compositor.
+    if (mp_w32_is_in_exclusive_mode())
+        return false;
+
+    return true;
+}
+
+static void w32_swap_buffers(MPGLContext *ctx)
+{
+    struct w32_context *w32_ctx = ctx->priv;
+    SwapBuffers(w32_ctx->hdc);
+
+    // default if we don't DwmFLush
+    int new_swapinterval = w32_ctx->opt_swapinterval;
+
+    if (ctx->dwm_flush_opt >= 0) {
+        if ((ctx->dwm_flush_opt == 1 && !ctx->vo->opts->fullscreen) ||
+            (ctx->dwm_flush_opt == 2) ||
+            (ctx->dwm_flush_opt == 0 && compositor_active(ctx)))
+        {
+            if (DwmFlush() == S_OK)
+                new_swapinterval = 0;
+        }
+    }
+
+    if (new_swapinterval != w32_ctx->current_swapinterval &&
+        w32_ctx->real_wglSwapInterval)
+    {
+        w32_ctx->real_wglSwapInterval(new_swapinterval);
+        MP_VERBOSE(ctx->vo, "set SwapInterval(%d)\n", new_swapinterval);
+    }
+    w32_ctx->current_swapinterval = new_swapinterval;
+}
+
+static int w32_control(MPGLContext *ctx, int *events, int request, void *arg)
+{
+    return vo_w32_control(ctx->vo, events, request, arg);
+}
+
+const struct mpgl_driver mpgl_driver_w32 = {
+    .name           = "win",
+    .priv_size      = sizeof(struct w32_context),
+    .init           = w32_init,
+    .reconfig       = w32_reconfig,
+    .swap_buffers   = w32_swap_buffers,
+    .control        = w32_control,
+    .uninit         = w32_uninit,
+};