Adding upstream version 0.37.0.upstream/0.37.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 653 insertions, 0 deletions

diff --git a/video/out/opengl/context_angle.c b/video/out/opengl/context_angle.c
new file mode 100644
index 0000000..553718a
--- /dev/null
+++ b/video/out/opengl/context_angle.c
@@ -0,0 +1,653 @@
+/*
+ * 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 <windows.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <EGL/eglext_angle.h>
+#include <d3d11.h>
+#include <dxgi1_2.h>
+#include <dwmapi.h>
+
+#include "angle_dynamic.h"
+#include "egl_helpers.h"
+#include "video/out/gpu/d3d11_helpers.h"
+
+#include "common/common.h"
+#include "options/m_config.h"
+#include "video/out/w32_common.h"
+#include "osdep/windows_utils.h"
+#include "context.h"
+#include "utils.h"
+
+#ifndef EGL_D3D_TEXTURE_ANGLE
+#define EGL_D3D_TEXTURE_ANGLE 0x33A3
+#endif
+#ifndef EGL_OPTIMAL_SURFACE_ORIENTATION_ANGLE
+#define EGL_OPTIMAL_SURFACE_ORIENTATION_ANGLE 0x33A7
+#define EGL_SURFACE_ORIENTATION_ANGLE 0x33A8
+#define EGL_SURFACE_ORIENTATION_INVERT_Y_ANGLE 0x0002
+#endif
+
+enum {
+    RENDERER_AUTO,
+    RENDERER_D3D9,
+    RENDERER_D3D11,
+};
+
+struct angle_opts {
+    int renderer;
+    int d3d11_warp;
+    int d3d11_feature_level;
+    int egl_windowing;
+    bool flip;
+};
+
+#define OPT_BASE_STRUCT struct angle_opts
+const struct m_sub_options angle_conf = {
+    .opts = (const struct m_option[]) {
+        {"angle-renderer", OPT_CHOICE(renderer,
+            {"auto", RENDERER_AUTO},
+            {"d3d9", RENDERER_D3D9},
+            {"d3d11", RENDERER_D3D11})},
+        {"angle-d3d11-warp", OPT_CHOICE(d3d11_warp,
+            {"auto", -1},
+            {"no", 0},
+            {"yes", 1})},
+        {"angle-d3d11-feature-level", OPT_CHOICE(d3d11_feature_level,
+            {"11_0", D3D_FEATURE_LEVEL_11_0},
+            {"10_1", D3D_FEATURE_LEVEL_10_1},
+            {"10_0", D3D_FEATURE_LEVEL_10_0},
+            {"9_3", D3D_FEATURE_LEVEL_9_3})},
+        {"angle-egl-windowing", OPT_CHOICE(egl_windowing,
+            {"auto", -1},
+            {"no", 0},
+            {"yes", 1})},
+        {"angle-flip", OPT_BOOL(flip)},
+        {0}
+    },
+    .defaults = &(const struct angle_opts) {
+        .renderer = RENDERER_AUTO,
+        .d3d11_warp = -1,
+        .d3d11_feature_level = D3D_FEATURE_LEVEL_11_0,
+        .egl_windowing = -1,
+        .flip = true,
+    },
+    .size = sizeof(struct angle_opts),
+};
+
+struct priv {
+    GL gl;
+
+    IDXGISwapChain *dxgi_swapchain;
+
+    ID3D11Device *d3d11_device;
+    ID3D11DeviceContext *d3d11_context;
+    ID3D11Texture2D *d3d11_backbuffer;
+
+    EGLConfig egl_config;
+    EGLDisplay egl_display;
+    EGLDeviceEXT egl_device;
+    EGLContext egl_context;
+    EGLSurface egl_window; // For the EGL windowing surface only
+    EGLSurface egl_backbuffer; // For the DXGI swap chain based surface
+
+    int sc_width, sc_height; // Swap chain width and height
+    int swapinterval;
+    bool flipped;
+
+    struct angle_opts *opts;
+};
+
+static __thread struct ra_ctx *current_ctx;
+
+static void update_sizes(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    p->sc_width = ctx->vo->dwidth ? ctx->vo->dwidth : 1;
+    p->sc_height = ctx->vo->dheight ? ctx->vo->dheight : 1;
+}
+
+static void d3d11_backbuffer_release(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+
+    if (p->egl_backbuffer) {
+        eglMakeCurrent(p->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+                       EGL_NO_CONTEXT);
+        eglDestroySurface(p->egl_display, p->egl_backbuffer);
+    }
+    p->egl_backbuffer = EGL_NO_SURFACE;
+
+    SAFE_RELEASE(p->d3d11_backbuffer);
+}
+
+static bool d3d11_backbuffer_get(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    struct vo *vo = ctx->vo;
+    HRESULT hr;
+
+    hr = IDXGISwapChain_GetBuffer(p->dxgi_swapchain, 0, &IID_ID3D11Texture2D,
+        (void**)&p->d3d11_backbuffer);
+    if (FAILED(hr)) {
+        MP_FATAL(vo, "Couldn't get swap chain back buffer\n");
+        return false;
+    }
+
+    EGLint pbuffer_attributes[] = {
+        EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGBA,
+        EGL_TEXTURE_TARGET, EGL_TEXTURE_2D,
+        EGL_NONE,
+    };
+    p->egl_backbuffer = eglCreatePbufferFromClientBuffer(p->egl_display,
+        EGL_D3D_TEXTURE_ANGLE, p->d3d11_backbuffer, p->egl_config,
+        pbuffer_attributes);
+    if (!p->egl_backbuffer) {
+        MP_FATAL(vo, "Couldn't create EGL pbuffer\n");
+        return false;
+    }
+
+    eglMakeCurrent(p->egl_display, p->egl_backbuffer, p->egl_backbuffer,
+                   p->egl_context);
+    return true;
+}
+
+static void d3d11_backbuffer_resize(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    struct vo *vo = ctx->vo;
+    HRESULT hr;
+
+    int old_sc_width = p->sc_width;
+    int old_sc_height = p->sc_height;
+
+    update_sizes(ctx);
+    // Avoid unnecessary resizing
+    if (old_sc_width == p->sc_width && old_sc_height == p->sc_height)
+        return;
+
+    // All references to backbuffers must be released before ResizeBuffers
+    // (including references held by ANGLE)
+    d3d11_backbuffer_release(ctx);
+
+    // The DirectX runtime may report errors related to the device like
+    // DXGI_ERROR_DEVICE_REMOVED at this point
+    hr = IDXGISwapChain_ResizeBuffers(p->dxgi_swapchain, 0, p->sc_width,
+        p->sc_height, DXGI_FORMAT_UNKNOWN, 0);
+    if (FAILED(hr))
+        MP_FATAL(vo, "Couldn't resize swapchain: %s\n", mp_HRESULT_to_str(hr));
+
+    if (!d3d11_backbuffer_get(ctx))
+        MP_FATAL(vo, "Couldn't get back buffer after resize\n");
+}
+
+static void d3d11_device_destroy(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+
+    PFNEGLRELEASEDEVICEANGLEPROC eglReleaseDeviceANGLE =
+        (PFNEGLRELEASEDEVICEANGLEPROC)eglGetProcAddress("eglReleaseDeviceANGLE");
+
+    if (p->egl_display)
+        eglTerminate(p->egl_display);
+    p->egl_display = EGL_NO_DISPLAY;
+
+    if (p->egl_device && eglReleaseDeviceANGLE)
+        eglReleaseDeviceANGLE(p->egl_device);
+    p->egl_device = 0;
+
+    SAFE_RELEASE(p->d3d11_device);
+}
+
+static bool d3d11_device_create(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    struct vo *vo = ctx->vo;
+    struct angle_opts *o = p->opts;
+
+    struct d3d11_device_opts device_opts = {
+        .allow_warp = o->d3d11_warp != 0,
+        .force_warp = o->d3d11_warp == 1,
+        .max_feature_level = o->d3d11_feature_level,
+        .min_feature_level = D3D_FEATURE_LEVEL_9_3,
+        .max_frame_latency = ctx->vo->opts->swapchain_depth,
+    };
+    if (!mp_d3d11_create_present_device(vo->log, &device_opts, &p->d3d11_device))
+        return false;
+    ID3D11Device_GetImmediateContext(p->d3d11_device, &p->d3d11_context);
+
+    PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT =
+        (PFNEGLGETPLATFORMDISPLAYEXTPROC)eglGetProcAddress("eglGetPlatformDisplayEXT");
+    if (!eglGetPlatformDisplayEXT) {
+        MP_FATAL(vo, "Missing EGL_EXT_platform_base\n");
+        return false;
+    }
+    PFNEGLCREATEDEVICEANGLEPROC eglCreateDeviceANGLE =
+        (PFNEGLCREATEDEVICEANGLEPROC)eglGetProcAddress("eglCreateDeviceANGLE");
+    if (!eglCreateDeviceANGLE) {
+        MP_FATAL(vo, "Missing EGL_EXT_platform_device\n");
+        return false;
+    }
+
+    p->egl_device = eglCreateDeviceANGLE(EGL_D3D11_DEVICE_ANGLE,
+        p->d3d11_device, NULL);
+    if (!p->egl_device) {
+        MP_FATAL(vo, "Couldn't create EGL device\n");
+        return false;
+    }
+
+    p->egl_display = eglGetPlatformDisplayEXT(EGL_PLATFORM_DEVICE_EXT,
+        p->egl_device, NULL);
+    if (!p->egl_display) {
+        MP_FATAL(vo, "Couldn't get EGL display\n");
+        return false;
+    }
+
+    return true;
+}
+
+static void d3d11_swapchain_surface_destroy(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+
+    bool had_swapchain = p->dxgi_swapchain;
+    SAFE_RELEASE(p->dxgi_swapchain);
+    d3d11_backbuffer_release(ctx);
+
+    // Ensure the swapchain is destroyed by flushing the D3D11 immediate
+    // context. This is needed because the HWND may be reused. See:
+    // https://msdn.microsoft.com/en-us/library/windows/desktop/ff476425.aspx
+    if (had_swapchain && p->d3d11_context)
+        ID3D11DeviceContext_Flush(p->d3d11_context);
+}
+
+static bool d3d11_swapchain_surface_create(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    struct vo *vo = ctx->vo;
+    struct angle_opts *o = p->opts;
+
+    if (!p->d3d11_device)
+        goto fail;
+
+    update_sizes(ctx);
+    struct d3d11_swapchain_opts swapchain_opts = {
+        .window = vo_w32_hwnd(vo),
+        .width = p->sc_width,
+        .height = p->sc_height,
+        .flip = o->flip,
+        // Add one frame for the backbuffer and one frame of "slack" to reduce
+        // contention with the window manager when acquiring the backbuffer
+        .length = ctx->vo->opts->swapchain_depth + 2,
+        .usage = DXGI_USAGE_RENDER_TARGET_OUTPUT | DXGI_USAGE_SHADER_INPUT,
+    };
+    if (!mp_d3d11_create_swapchain(p->d3d11_device, vo->log, &swapchain_opts,
+                                   &p->dxgi_swapchain))
+        goto fail;
+    if (!d3d11_backbuffer_get(ctx))
+        goto fail;
+
+    p->flipped = true;
+    return true;
+
+fail:
+    d3d11_swapchain_surface_destroy(ctx);
+    return false;
+}
+
+static void d3d9_device_destroy(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+
+    if (p->egl_display)
+        eglTerminate(p->egl_display);
+    p->egl_display = EGL_NO_DISPLAY;
+}
+
+static bool d3d9_device_create(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    struct vo *vo = ctx->vo;
+
+    PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT =
+        (PFNEGLGETPLATFORMDISPLAYEXTPROC)eglGetProcAddress("eglGetPlatformDisplayEXT");
+    if (!eglGetPlatformDisplayEXT) {
+        MP_FATAL(vo, "Missing EGL_EXT_platform_base\n");
+        return false;
+    }
+
+    EGLint display_attributes[] = {
+        EGL_PLATFORM_ANGLE_TYPE_ANGLE,
+            EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE,
+        EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE,
+            EGL_PLATFORM_ANGLE_DEVICE_TYPE_HARDWARE_ANGLE,
+        EGL_NONE,
+    };
+    p->egl_display = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE,
+        EGL_DEFAULT_DISPLAY, display_attributes);
+    if (p->egl_display == EGL_NO_DISPLAY) {
+        MP_FATAL(vo, "Couldn't get display\n");
+        return false;
+    }
+
+    return true;
+}
+
+static void egl_window_surface_destroy(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    if (p->egl_window) {
+        eglMakeCurrent(p->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+                       EGL_NO_CONTEXT);
+    }
+}
+
+static bool egl_window_surface_create(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    struct vo *vo = ctx->vo;
+
+    int window_attribs_len = 0;
+    EGLint *window_attribs = NULL;
+
+    EGLint flip_val;
+    if (eglGetConfigAttrib(p->egl_display, p->egl_config,
+                           EGL_OPTIMAL_SURFACE_ORIENTATION_ANGLE, &flip_val))
+    {
+        if (flip_val == EGL_SURFACE_ORIENTATION_INVERT_Y_ANGLE) {
+            MP_TARRAY_APPEND(NULL, window_attribs, window_attribs_len,
+                EGL_SURFACE_ORIENTATION_ANGLE);
+            MP_TARRAY_APPEND(NULL, window_attribs, window_attribs_len,
+                EGL_SURFACE_ORIENTATION_INVERT_Y_ANGLE);
+            p->flipped = true;
+            MP_VERBOSE(vo, "Rendering flipped.\n");
+        }
+    }
+
+    MP_TARRAY_APPEND(NULL, window_attribs, window_attribs_len, EGL_NONE);
+    p->egl_window = eglCreateWindowSurface(p->egl_display, p->egl_config,
+                                           vo_w32_hwnd(vo), window_attribs);
+    talloc_free(window_attribs);
+    if (!p->egl_window) {
+        MP_FATAL(vo, "Could not create EGL surface!\n");
+        goto fail;
+    }
+
+    eglMakeCurrent(p->egl_display, p->egl_window, p->egl_window,
+                   p->egl_context);
+    return true;
+fail:
+    egl_window_surface_destroy(ctx);
+    return false;
+}
+
+static void context_destroy(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    if (p->egl_context) {
+        eglMakeCurrent(p->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+                       EGL_NO_CONTEXT);
+        eglDestroyContext(p->egl_display, p->egl_context);
+    }
+    p->egl_context = EGL_NO_CONTEXT;
+}
+
+static bool context_init(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    struct vo *vo = ctx->vo;
+
+    if (!eglInitialize(p->egl_display, NULL, NULL)) {
+        MP_FATAL(vo, "Couldn't initialize EGL\n");
+        goto fail;
+    }
+
+    const char *exts = eglQueryString(p->egl_display, EGL_EXTENSIONS);
+    if (exts)
+        MP_DBG(vo, "EGL extensions: %s\n", exts);
+
+    if (!mpegl_create_context(ctx, p->egl_display, &p->egl_context,
+                              &p->egl_config))
+    {
+        MP_FATAL(vo, "Could not create EGL context!\n");
+        goto fail;
+    }
+
+    return true;
+fail:
+    context_destroy(ctx);
+    return false;
+}
+
+static void angle_uninit(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+
+    ra_gl_ctx_uninit(ctx);
+
+    DwmEnableMMCSS(FALSE);
+
+    // Uninit the EGL surface implementation that is being used. Note: This may
+    // result in the *_destroy function being called twice since it is also
+    // called when the surface create function fails. This is fine because the
+    // *_destroy functions are idempotent.
+    if (p->dxgi_swapchain)
+        d3d11_swapchain_surface_destroy(ctx);
+    else
+        egl_window_surface_destroy(ctx);
+
+    context_destroy(ctx);
+
+    // Uninit the EGL device implementation that is being used
+    if (p->d3d11_device)
+        d3d11_device_destroy(ctx);
+    else
+        d3d9_device_destroy(ctx);
+
+    vo_w32_uninit(ctx->vo);
+}
+
+static int GLAPIENTRY angle_swap_interval(int interval)
+{
+    if (!current_ctx)
+        return 0;
+    struct priv *p = current_ctx->priv;
+
+    if (p->dxgi_swapchain) {
+        p->swapinterval = MPCLAMP(interval, 0, 4);
+        return 1;
+    } else {
+        return eglSwapInterval(p->egl_display, interval);
+    }
+}
+
+static void d3d11_swap_buffers(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+
+    // Calling Present() on a flip-sequential swap chain will silently change
+    // the underlying storage of the back buffer to point to the next buffer in
+    // the chain. This results in the RTVs for the back buffer becoming
+    // unbound. Since ANGLE doesn't know we called Present(), it will continue
+    // using the unbound RTVs, so we must save and restore them ourselves.
+    ID3D11RenderTargetView *rtvs[D3D11_SIMULTANEOUS_RENDER_TARGET_COUNT] = {0};
+    ID3D11DepthStencilView *dsv = NULL;
+    ID3D11DeviceContext_OMGetRenderTargets(p->d3d11_context,
+        MP_ARRAY_SIZE(rtvs), rtvs, &dsv);
+
+    HRESULT hr = IDXGISwapChain_Present(p->dxgi_swapchain, p->swapinterval, 0);
+    if (FAILED(hr))
+        MP_FATAL(ctx->vo, "Couldn't present: %s\n", mp_HRESULT_to_str(hr));
+
+    // Restore the RTVs and release the objects
+    ID3D11DeviceContext_OMSetRenderTargets(p->d3d11_context,
+        MP_ARRAY_SIZE(rtvs), rtvs, dsv);
+    for (int i = 0; i < MP_ARRAY_SIZE(rtvs); i++)
+        SAFE_RELEASE(rtvs[i]);
+    SAFE_RELEASE(dsv);
+}
+
+static void egl_swap_buffers(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    eglSwapBuffers(p->egl_display, p->egl_window);
+}
+
+static void angle_swap_buffers(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    if (p->dxgi_swapchain)
+        d3d11_swap_buffers(ctx);
+    else
+        egl_swap_buffers(ctx);
+}
+
+
+static int angle_color_depth(struct ra_swapchain *sw)
+{
+    // Only 8-bit output is supported at the moment
+    return 8;
+}
+
+static bool angle_submit_frame(struct ra_swapchain *sw,
+                               const struct vo_frame *frame)
+{
+    struct priv *p = sw->ctx->priv;
+    bool ret = ra_gl_ctx_submit_frame(sw, frame);
+    if (p->d3d11_context) {
+        // DXGI Present doesn't flush the immediate context, which can make
+        // timers inaccurate, since the end queries might not be sent until the
+        // next frame. Fix this by flushing the context now.
+        ID3D11DeviceContext_Flush(p->d3d11_context);
+    }
+    return ret;
+}
+
+static bool angle_init(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv = talloc_zero(ctx, struct priv);
+    struct vo *vo = ctx->vo;
+    GL *gl = &p->gl;
+
+    p->opts = mp_get_config_group(ctx, ctx->global, &angle_conf);
+    struct angle_opts *o = p->opts;
+
+    if (!angle_load()) {
+        MP_VERBOSE(vo, "Failed to load LIBEGL.DLL\n");
+        goto fail;
+    }
+
+    // Create the underlying EGL device implementation
+    bool context_ok = false;
+    if ((!context_ok && !o->renderer) || o->renderer == RENDERER_D3D11) {
+        context_ok = d3d11_device_create(ctx);
+        if (context_ok) {
+            context_ok = context_init(ctx);
+            if (!context_ok)
+                d3d11_device_destroy(ctx);
+        }
+    }
+    if ((!context_ok && !o->renderer) || o->renderer == RENDERER_D3D9) {
+        context_ok = d3d9_device_create(ctx);
+        if (context_ok) {
+            MP_VERBOSE(vo, "Using Direct3D 9\n");
+
+            context_ok = context_init(ctx);
+            if (!context_ok)
+                d3d9_device_destroy(ctx);
+        }
+    }
+    if (!context_ok)
+        goto fail;
+
+    if (!vo_w32_init(vo))
+        goto fail;
+
+    // Create the underlying EGL surface implementation
+    bool surface_ok = false;
+    if ((!surface_ok && o->egl_windowing == -1) || o->egl_windowing == 0) {
+        surface_ok = d3d11_swapchain_surface_create(ctx);
+    }
+    if ((!surface_ok && o->egl_windowing == -1) || o->egl_windowing == 1) {
+        surface_ok = egl_window_surface_create(ctx);
+        if (surface_ok)
+            MP_VERBOSE(vo, "Using EGL windowing\n");
+    }
+    if (!surface_ok)
+        goto fail;
+
+    mpegl_load_functions(gl, vo->log);
+
+    current_ctx = ctx;
+    gl->SwapInterval = angle_swap_interval;
+
+    // Custom swapchain impl for the D3D11 swapchain-based surface
+    static const struct ra_swapchain_fns dxgi_swapchain_fns = {
+        .color_depth = angle_color_depth,
+        .submit_frame = angle_submit_frame,
+    };
+    struct ra_gl_ctx_params params = {
+        .swap_buffers = angle_swap_buffers,
+        .external_swapchain = p->dxgi_swapchain ? &dxgi_swapchain_fns : NULL,
+    };
+
+    gl->flipped = p->flipped;
+    if (!ra_gl_ctx_init(ctx, gl, params))
+        goto fail;
+
+    DwmEnableMMCSS(TRUE); // DWM MMCSS cargo-cult. The dxgl backend also does this.
+
+    return true;
+fail:
+    angle_uninit(ctx);
+    return false;
+}
+
+static void resize(struct ra_ctx *ctx)
+{
+    struct priv *p = ctx->priv;
+    if (p->dxgi_swapchain)
+        d3d11_backbuffer_resize(ctx);
+    else
+        eglWaitClient(); // Should get ANGLE to resize its swapchain
+    ra_gl_ctx_resize(ctx->swapchain, ctx->vo->dwidth, ctx->vo->dheight, 0);
+}
+
+static bool angle_reconfig(struct ra_ctx *ctx)
+{
+    vo_w32_config(ctx->vo);
+    resize(ctx);
+    return true;
+}
+
+static int angle_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;
+}
+
+const struct ra_ctx_fns ra_ctx_angle = {
+    .type           = "opengl",
+    .name           = "angle",
+    .init           = angle_init,
+    .reconfig       = angle_reconfig,
+    .control        = angle_control,
+    .uninit         = angle_uninit,
+};