1 files changed, 95 insertions, 0 deletions
diff --git a/video/out/gpu/context.h b/video/out/gpu/context.h
new file mode 100644
index 0000000000..42de59b75f
--- /dev/null
+++ b/video/out/gpu/context.h
@@ -0,0 +1,95 @@
+#pragma once
+
+#include "video/out/vo.h"
+
+#include "config.h"
+#include "ra.h"
+
+struct ra_ctx_opts {
+    int allow_sw;        // allow software renderers
+    int want_alpha;      // create an alpha framebuffer if possible
+    int debug;           // enable debugging layers/callbacks etc.
+    bool probing;        // the backend was auto-probed
+    int swapchain_depth; // max number of images to render ahead
+};
+
+struct ra_ctx {
+    struct vo *vo;
+    struct ra *ra;
+    struct mpv_global *global;
+    struct mp_log *log;
+
+    struct ra_ctx_opts opts;
+    const struct ra_ctx_fns *fns;
+    struct ra_swapchain *swapchain;
+
+    void *priv;
+};
+
+// The functions that make up a ra_ctx.
+struct ra_ctx_fns {
+    const char *type; // API type (for --gpu-api)
+    const char *name; // name (for --gpu-context)
+
+    // Resize the window, or create a new window if there isn't one yet.
+    // Currently, there is an unfortunate interaction with ctx->vo, and
+    // display size etc. are determined by it.
+    bool (*reconfig)(struct ra_ctx *ctx);
+
+    // This behaves exactly like vo_driver.control().
+    int (*control)(struct ra_ctx *ctx, int *events, int request, void *arg);
+
+    // These behave exactly like vo_driver.wakeup/wait_events. They are
+    // optional.
+    void (*wakeup)(struct ra_ctx *ctx);
+    void (*wait_events)(struct ra_ctx *ctx, int64_t until_time_us);
+
+    // Initialize/destroy the 'struct ra' and possibly the underlying VO backend.
+    // Not normally called by the user of the ra_ctx.
+    bool (*init)(struct ra_ctx *ctx);
+    void (*uninit)(struct ra_ctx *ctx);
+};
+
+// Extra struct for the swapchain-related functions so they can be easily
+// inherited from helpers.
+struct ra_swapchain {
+    struct ra_ctx *ctx;
+    struct priv *priv;
+    const struct ra_swapchain_fns *fns;
+
+    bool flip_v; // flip the rendered image vertically (set by the swapchain)
+};
+
+struct ra_swapchain_fns {
+    // Gets the current framebuffer depth in bits (0 if unknown). Optional.
+    int (*color_depth)(struct ra_swapchain *sw);
+
+    // Retrieves a screenshot of the framebuffer. These are always the right
+    // side up, regardless of ra_swapchain->flip_v. Optional.
+    struct mp_image *(*screenshot)(struct ra_swapchain *sw);
+
+    // Called when rendering starts. Returns NULL on failure. This must be
+    // followed by submit_frame, to submit the rendered frame.
+    struct ra_tex *(*start_frame)(struct ra_swapchain *sw);
+
+    // Present the frame. Issued in lockstep with start_frame, with rendering
+    // commands in between. The `frame` is just there for timing data, for
+    // swapchains smart enough to do something with it.
+    bool (*submit_frame)(struct ra_swapchain *sw, const struct vo_frame *frame);
+
+    // Performs a buffer swap. This blocks for as long as necessary to meet
+    // params.swapchain_depth, or until the next vblank (for vsynced contexts)
+    void (*swap_buffers)(struct ra_swapchain *sw);
+};
+
+// Create and destroy a ra_ctx. This also takes care of creating and destroying
+// the underlying `struct ra`, and perhaps the underlying VO backend.
+struct ra_ctx *ra_ctx_create(struct vo *vo, const char *context_type,
+                             const char *context_name, struct ra_ctx_opts opts);
+void ra_ctx_destroy(struct ra_ctx **ctx);
+
+struct m_option;
+int ra_ctx_validate_api(struct mp_log *log, const struct m_option *opt,
+                        struct bstr name, struct bstr param);
+int ra_ctx_validate_context(struct mp_log *log, const struct m_option *opt,
+                            struct bstr name, struct bstr param);