mirror of https://github.com/mpv-player/mpv
38 lines
1.9 KiB
C
38 lines
1.9 KiB
C
#pragma once
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// This is a helper for implementing thread-safety for DR callbacks. These need
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// to allocate GPU buffers on the GPU thread (e.g. OpenGL with its forced TLS),
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// and the buffers also need to be freed on the GPU thread.
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// This is not a helpful "Dr.", rather it represents Satan in form of C code.
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struct dr_helper;
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struct mp_image;
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struct mp_dispatch_queue;
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// dr_helper_get_image() calls will use the dispatch queue to run get_image on
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// a target thread, which processes the dispatch queue.
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// Note: the dispatch queue must process outstanding async. work before the
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// dr_helper instance can be destroyed.
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struct dr_helper *dr_helper_create(struct mp_dispatch_queue *dispatch,
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struct mp_image *(*get_image)(void *ctx, int imgfmt, int w, int h,
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int stride_align, int flags),
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void *get_image_ctx);
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// Make DR release calls (freeing images) reentrant if they are called on this
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// (mp_thread_self()) thread. That means any free call will directly release the
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// image as allocated with get_image().
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// Only 1 thread can use this at a time. Note that it would make no sense to
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// call this on more than 1 thread, as get_image is assumed not thread-safe.
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void dr_helper_acquire_thread(struct dr_helper *dr);
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// This _must_ be called on the same thread as dr_helper_acquire_thread() was
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// called. Every release call must be paired with an acquire call.
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void dr_helper_release_thread(struct dr_helper *dr);
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// Allocate an image by running the get_image callback on the target thread.
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// Always blocks on dispatch queue processing. This implies there is no way to
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// allocate a DR'ed image on the render thread (at least not in a way which
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// actually works if you want foreign threads to be able to free them).
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struct mp_image *dr_helper_get_image(struct dr_helper *dr, int imgfmt,
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int w, int h, int stride_align, int flags);
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