#include "config.h"

#include "hwdec.h"

#include "libmpv_gpu.h"

#include "mpv/render_gl.h"

#include "video.h"

#include "video/out/libmpv.h"

static const struct libmpv_gpu_context_fns *context_backends[] = {

#if HAVE_GL

    &libmpv_gpu_context_gl,

#endif

    NULL

};

struct priv {

    struct libmpv_gpu_context *context;

    struct gl_video *renderer;

};

struct native_resource_entry {

    const char *name;   // ra_add_native_resource() internal name argument

    size_t size;        // size of struct pointed to (0 for no copy)

};

static const struct native_resource_entry native_resource_map[] = {

    [MPV_RENDER_PARAM_X11_DISPLAY] = {

        .name = "x11",

        .size = 0,

    },

    [MPV_RENDER_PARAM_WL_DISPLAY] = {

        .name = "wl",

        .size = 0,

    },

    [MPV_RENDER_PARAM_DRM_DRAW_SURFACE_SIZE] = {

        .name = "drm_draw_surface_size",

        .size = sizeof (mpv_opengl_drm_draw_surface_size),

    },

    [MPV_RENDER_PARAM_DRM_DISPLAY_V2] = {

        .name = "drm_params_v2",

        .size = sizeof (mpv_opengl_drm_params_v2),

    },

};

static int init(struct render_backend *ctx, mpv_render_param *params)

{

    ctx->priv = talloc_zero(NULL, struct priv);

    struct priv *p = ctx->priv;

    char *api = get_mpv_render_param(params, MPV_RENDER_PARAM_API_TYPE, NULL);

    if (!api)

        return MPV_ERROR_INVALID_PARAMETER;

    for (int n = 0; context_backends[n]; n++) {

        const struct libmpv_gpu_context_fns *backend = context_backends[n];

        if (strcmp(backend->api_name, api) == 0) {

            p->context = talloc_zero(NULL, struct libmpv_gpu_context);

            *p->context = (struct libmpv_gpu_context){

                .global = ctx->global,

                .log = ctx->log,

                .fns = backend,

            };

            break;

        }

    }

    if (!p->context)

        return MPV_ERROR_NOT_IMPLEMENTED;

    int err = p->context->fns->init(p->context, params);

    if (err < 0)

        return err;

    for (int n = 0; params && params[n].type; n++) {

        if (params[n].type > 0 &&

            params[n].type < MP_ARRAY_SIZE(native_resource_map) &&

            native_resource_map[params[n].type].name)

        {

            const struct native_resource_entry *entry =

                &native_resource_map[params[n].type];

            void *data = params[n].data;

            if (entry->size)

                data = talloc_memdup(p, data, entry->size);

            ra_add_native_resource(p->context->ra_ctx->ra, entry->name, data);

        }

    }

    p->renderer = gl_video_init(p->context->ra_ctx->ra, ctx->log, ctx->global);

    ctx->hwdec_devs = hwdec_devices_create();

    gl_video_init_hwdecs(p->renderer, p->context->ra_ctx, ctx->hwdec_devs, true);

    ctx->driver_caps = VO_CAP_ROTATE90 | VO_CAP_VFLIP;

    return 0;

}

static bool check_format(struct render_backend *ctx, int imgfmt)

{

    struct priv *p = ctx->priv;

    return gl_video_check_format(p->renderer, imgfmt);

}

static int set_parameter(struct render_backend *ctx, mpv_render_param param)

{

    struct priv *p = ctx->priv;

    switch (param.type) {

    case MPV_RENDER_PARAM_ICC_PROFILE: {

        mpv_byte_array *data = param.data;

        gl_video_set_icc_profile(p->renderer, bstrdup(NULL, (bstr){data->data, data->size}));

        return 0;

    }

    case MPV_RENDER_PARAM_AMBIENT_LIGHT: {

        MP_WARN(ctx, "MPV_RENDER_PARAM_AMBIENT_LIGHT is deprecated and might be "

                     "removed in the future (replacement: gamma-auto.lua)\n");

        int lux = *(int *)param.data;

        gl_video_set_ambient_lux(p->renderer, (double)lux);

        return 0;

    }

    default:

        return MPV_ERROR_NOT_IMPLEMENTED;

    }

}

static void reconfig(struct render_backend *ctx, struct mp_image_params *params)

{

    struct priv *p = ctx->priv;

    gl_video_config(p->renderer, params);

}

static void reset(struct render_backend *ctx)

{

    struct priv *p = ctx->priv;

    gl_video_reset(p->renderer);

}

static void update_external(struct render_backend *ctx, struct vo *vo)

{

    struct priv *p = ctx->priv;

    gl_video_set_osd_source(p->renderer, vo ? vo->osd : NULL);

    if (vo)

        gl_video_configure_queue(p->renderer, vo);

}

static void resize(struct render_backend *ctx, struct mp_rect *src,

                   struct mp_rect *dst, struct mp_osd_res *osd)

{

    struct priv *p = ctx->priv;

    gl_video_resize(p->renderer, src, dst, osd);

}

static int get_target_size(struct render_backend *ctx, mpv_render_param *params,

                           int *out_w, int *out_h)

{

    struct priv *p = ctx->priv;

    // Mapping the surface is cheap, better than adding new backend entrypoints.

    struct ra_tex *tex;

    int err = p->context->fns->wrap_fbo(p->context, params, &tex);

    if (err < 0)

        return err;

    *out_w = tex->params.w;

    *out_h = tex->params.h;

    return 0;

}

static int render(struct render_backend *ctx, mpv_render_param *params,

                  struct vo_frame *frame)

{

    struct priv *p = ctx->priv;

    // Mapping the surface is cheap, better than adding new backend entrypoints.

    struct ra_tex *tex;

    int err = p->context->fns->wrap_fbo(p->context, params, &tex);

    if (err < 0)

        return err;

    int depth = *(int *)get_mpv_render_param(params, MPV_RENDER_PARAM_DEPTH,

                                             &(int){0});

    gl_video_set_fb_depth(p->renderer, depth);

    bool flip = *(int *)get_mpv_render_param(params, MPV_RENDER_PARAM_FLIP_Y,

                                             &(int){0});

    struct ra_fbo target = {.tex = tex, .flip = flip};

    gl_video_render_frame(p->renderer, frame, &target, RENDER_FRAME_DEF);

    p->context->fns->done_frame(p->context, frame->display_synced);

    return 0;

}

static struct mp_image *get_image(struct render_backend *ctx, int imgfmt,

                                  int w, int h, int stride_align, int flags)

{

    struct priv *p = ctx->priv;

    return gl_video_get_image(p->renderer, imgfmt, w, h, stride_align, flags);

}

static void screenshot(struct render_backend *ctx, struct vo_frame *frame,

                       struct voctrl_screenshot *args)

{

    struct priv *p = ctx->priv;

    gl_video_screenshot(p->renderer, frame, args);

}

static void perfdata(struct render_backend *ctx,

                     struct voctrl_performance_data *out)

{

    struct priv *p = ctx->priv;

    gl_video_perfdata(p->renderer, out);

}

static void destroy(struct render_backend *ctx)

{

    struct priv *p = ctx->priv;

    if (p->renderer)

        gl_video_uninit(p->renderer);

    hwdec_devices_destroy(ctx->hwdec_devs);

    if (p->context) {

        p->context->fns->destroy(p->context);

        talloc_free(p->context->priv);

        talloc_free(p->context);

    }

}

const struct render_backend_fns render_backend_gpu = {

    .init = init,

    .check_format = check_format,

    .set_parameter = set_parameter,

    .reconfig = reconfig,

    .reset = reset,

    .update_external = update_external,

    .resize = resize,

    .get_target_size = get_target_size,

    .render = render,

    .get_image = get_image,

    .screenshot = screenshot,

    .perfdata = perfdata,

    .destroy = destroy,

};