vo_opengl: split backend code from common.c to context.c

Now common.c only contains the code for the function loader, while
context.c contains the backend loader/dispatcher.

Not calling it "backend.c", because the central struct is called
MPGLContext.

1 files changed, 228 insertions, 0 deletions

diff --git a/video/out/opengl/context.c b/video/out/opengl/context.c
new file mode 100644
index 0000000000..c863334306
--- /dev/null
+++ b/video/out/opengl/context.c
@@ -0,0 +1,228 @@
+/*
+ * common OpenGL routines
+ *
+ * copyleft (C) 2005-2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ * Special thanks go to the xine team and Matthias Hopf, whose video_out_opengl.c
+ * gave me lots of good ideas.
+ *
+ * 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 <stddef.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+#include <math.h>
+#include <assert.h>
+
+#include "context.h"
+#include "common/common.h"
+#include "options/options.h"
+#include "options/m_option.h"
+
+extern const struct mpgl_driver mpgl_driver_x11;
+extern const struct mpgl_driver mpgl_driver_x11egl;
+extern const struct mpgl_driver mpgl_driver_x11_probe;
+extern const struct mpgl_driver mpgl_driver_drm_egl;
+extern const struct mpgl_driver mpgl_driver_cocoa;
+extern const struct mpgl_driver mpgl_driver_wayland;
+extern const struct mpgl_driver mpgl_driver_w32;
+extern const struct mpgl_driver mpgl_driver_angle;
+extern const struct mpgl_driver mpgl_driver_dxinterop;
+extern const struct mpgl_driver mpgl_driver_rpi;
+
+static const struct mpgl_driver *const backends[] = {
+#if HAVE_RPI
+    &mpgl_driver_rpi,
+#endif
+#if HAVE_GL_COCOA
+    &mpgl_driver_cocoa,
+#endif
+#if HAVE_EGL_ANGLE
+    &mpgl_driver_angle,
+#endif
+#if HAVE_GL_WIN32
+    &mpgl_driver_w32,
+#endif
+#if HAVE_GL_DXINTEROP
+    &mpgl_driver_dxinterop,
+#endif
+#if HAVE_GL_WAYLAND
+    &mpgl_driver_wayland,
+#endif
+#if HAVE_GL_X11
+    &mpgl_driver_x11_probe,
+#endif
+#if HAVE_EGL_X11
+    &mpgl_driver_x11egl,
+#endif
+#if HAVE_GL_X11
+    &mpgl_driver_x11,
+#endif
+#if HAVE_EGL_DRM
+    &mpgl_driver_drm_egl,
+#endif
+};
+
+int mpgl_find_backend(const char *name)
+{
+    if (name == NULL || strcmp(name, "auto") == 0)
+        return -1;
+    for (int n = 0; n < MP_ARRAY_SIZE(backends); n++) {
+        if (strcmp(backends[n]->name, name) == 0)
+            return n;
+    }
+    return -2;
+}
+
+int mpgl_validate_backend_opt(struct mp_log *log, const struct m_option *opt,
+                              struct bstr name, struct bstr param)
+{
+    if (bstr_equals0(param, "help")) {
+        mp_info(log, "OpenGL windowing backends:\n");
+        mp_info(log, "    auto (autodetect)\n");
+        for (int n = 0; n < MP_ARRAY_SIZE(backends); n++)
+            mp_info(log, "    %s\n", backends[n]->name);
+        return M_OPT_EXIT - 1;
+    }
+    char s[20];
+    snprintf(s, sizeof(s), "%.*s", BSTR_P(param));
+    return mpgl_find_backend(s) >= -1 ? 1 : M_OPT_INVALID;
+}
+
+#if HAVE_C11_TLS
+static _Thread_local MPGLContext *current_context;
+
+static void * GLAPIENTRY get_native_display(const char *name)
+{
+    if (current_context && current_context->native_display_type &&
+        name && strcmp(current_context->native_display_type, name) == 0)
+        return current_context->native_display;
+    return NULL;
+}
+
+static void set_current_context(MPGLContext *context)
+{
+    current_context = context;
+    if (context && !context->gl->MPGetNativeDisplay)
+        context->gl->MPGetNativeDisplay = get_native_display;
+}
+#else
+static void set_current_context(MPGLContext *context)
+{
+}
+#endif
+
+static MPGLContext *init_backend(struct vo *vo, const struct mpgl_driver *driver,
+                                 bool probing, int vo_flags)
+{
+    MPGLContext *ctx = talloc_ptrtype(NULL, ctx);
+    *ctx = (MPGLContext) {
+        .gl = talloc_zero(ctx, GL),
+        .vo = vo,
+        .driver = driver,
+    };
+    bool old_probing = vo->probing;
+    vo->probing = probing; // hack; kill it once backends are separate
+    MP_VERBOSE(vo, "Initializing OpenGL backend '%s'\n", ctx->driver->name);
+    ctx->priv = talloc_zero_size(ctx, ctx->driver->priv_size);
+    if (ctx->driver->init(ctx, vo_flags) < 0) {
+        vo->probing = old_probing;
+        talloc_free(ctx);
+        return NULL;
+    }
+    vo->probing = old_probing;
+
+    if (!ctx->gl->version && !ctx->gl->es)
+        goto cleanup;
+
+    if (probing && ctx->gl->es && (vo_flags & VOFLAG_NO_GLES)) {
+        MP_VERBOSE(ctx->vo, "Skipping GLES backend.\n");
+        goto cleanup;
+    }
+
+    if (ctx->gl->mpgl_caps & MPGL_CAP_SW) {
+        MP_WARN(ctx->vo, "Suspected software renderer or indirect context.\n");
+        if (vo->probing && !(vo_flags & VOFLAG_SW))
+            goto cleanup;
+    }
+
+    ctx->gl->debug_context = !!(vo_flags & VOFLAG_GL_DEBUG);
+
+    set_current_context(ctx);
+
+    return ctx;
+
+cleanup:
+    mpgl_uninit(ctx);
+    return NULL;
+}
+
+// Create a VO window and create a GL context on it.
+//  vo_flags: passed to the backend's create window function
+MPGLContext *mpgl_init(struct vo *vo, const char *backend_name, int vo_flags)
+{
+    MPGLContext *ctx = NULL;
+    int index = mpgl_find_backend(backend_name);
+    if (index == -1) {
+        for (int n = 0; n < MP_ARRAY_SIZE(backends); n++) {
+            ctx = init_backend(vo, backends[n], true, vo_flags);
+            if (ctx)
+                break;
+        }
+        // VO forced, but no backend is ok => force the first that works at all
+        if (!ctx && !vo->probing) {
+            for (int n = 0; n < MP_ARRAY_SIZE(backends); n++) {
+                ctx = init_backend(vo, backends[n], false, vo_flags);
+                if (ctx)
+                    break;
+            }
+        }
+    } else if (index >= 0) {
+        ctx = init_backend(vo, backends[index], false, vo_flags);
+    }
+    return ctx;
+}
+
+int mpgl_reconfig_window(struct MPGLContext *ctx)
+{
+    return ctx->driver->reconfig(ctx);
+}
+
+int mpgl_control(struct MPGLContext *ctx, int *events, int request, void *arg)
+{
+    return ctx->driver->control(ctx, events, request, arg);
+}
+
+void mpgl_swap_buffers(struct MPGLContext *ctx)
+{
+    ctx->driver->swap_buffers(ctx);
+}
+
+void mpgl_uninit(MPGLContext *ctx)
+{
+    set_current_context(NULL);
+    if (ctx)
+        ctx->driver->uninit(ctx);
+    talloc_free(ctx);
+}