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upload.h

/*
 * This file is part of libplacebo.
 *
 * libplacebo 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.
 *
 * libplacebo 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 libplacebo.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef LIBPLACEBO_UPLOAD_H_
#define LIBPLACEBO_UPLOAD_H_

#include <stdint.h>

#include <libplacebo/gpu.h>
#include <libplacebo/renderer.h>

PL_API_BEGIN

// This file contains a utility function to assist in uploading data from host
// memory to a texture. In particular, the texture will be suitable for use as
// a `pl_plane`.

// Description of the host representation of an image plane
struct pl_plane_data {
    enum pl_fmt_type type;  // meaning of the data (must not be UINT or SINT)
    int width, height;      // dimensions of the plane
    int component_size[4];  // size in bits of each coordinate
    int component_pad[4];   // ignored bits preceding each component
    int component_map[4];   // semantic meaning of each component (pixel order)
    size_t pixel_stride;    // offset in bytes between pixels (required)
    size_t row_stride;      // offset in bytes between rows (optional)
    bool swapped;           // pixel data is endian-swapped (non-native)

// Similar to `pl_tex_transfer_params`, you can either upload from a raw
    // pointer address, or a buffer + offset. Again, the use of these two
    // mechanisms is mutually exclusive.
    //
    // 1. Uploading from host memory
    const void *pixels;     // the actual data underlying this plane

// 2. Uploading from a buffer (requires `pl_gpu_limits.buf_transfer`)
    pl_buf buf;             // the buffer to use
    size_t buf_offset;      // offset of data within buffer, must be a
                            // multiple of `pixel_stride` as well as of 4

// Similar to `pl_tex_transfer_params.callback`, this allows turning the
    // upload of a plane into an asynchronous upload. The same notes apply.
    void (*callback)(void *priv);
    void *priv;

// Note: When using this together with `pl_frame`, there is some amount of
    // overlap between `component_pad` and `pl_color_repr.bits`. Some key
    // differences between the two:
    //
    // - the bits from `component_pad` are ignored; whereas the superfluous bits
    //   in a `pl_color_repr` must be 0.
    // - the `component_pad` exists to align the component size and placement
    //   with the capabilities of GPUs; the `pl_color_repr` exists to control
    //   the semantics of the color samples on a finer granularity.
    // - the `pl_color_repr` applies to the color sample as a whole, and
    //   therefore applies to all planes; the `component_pad` can be different
    //   for each plane.
    // - `component_pad` interacts with float textures by moving the actual
    //   float in memory. `pl_color_repr` interacts with float data as if
    //   the float was converted from an integer under full range semantics.
    //
    // To help establish the motivating difference, a typical example of a use
    // case would be yuv420p10. Since 10-bit GPU texture support is limited,
    // and working with non-byte-aligned pixels is awkward in general, the
    // convention is to represent yuv420p10 as 16-bit samples with either the
    // high or low bits set to 0. In this scenario, the `component_size` of the
    // `pl_plane_data` and `pl_bit_encoding.sample_depth` would be 16, while
    // the `pl_bit_encoding.color_depth` would be 10 (and additionally, the
    // `pl_bit_encoding.bit_shift` would be either 0 or  6, depending on
    // whether the low or the high bits are used).
    //
    // On the contrary, something like a packed, 8-bit XBGR format (where the
    // X bits are ignored and may contain garbage) would set `component_pad[0]`
    // to 8, and the component_size[0:2] (respectively) to 8 as well.
    //
    // As a general rule of thumb, for maximum compatibility, you should try
    // and align component_size/component_pad to multiples of 8 and explicitly
    // clear any remaining superfluous bits (+ use `pl_color_repr.bits` to
    // ensure they're decoded correctly). You should also try to align the
    // `pixel_stride` to a power of two.
};

// Fills in the `component_size`, `component_pad` and `component_map` fields
// based on the supplied mask for each component (in semantic order, i.e.
// RGBA). Each element of `mask` must have a contiguous range of set bits.
PL_API void pl_plane_data_from_mask(struct pl_plane_data *data, uint64_t mask[4]);

// Fills in the `component_size`, `component_pad` and `component_map` fields
// based on the supplied sizes (in bits) and shift of each component (in
// semantic order).
//
// Similar to `pl_plane_data_from_mask` but not limited to 64-bit pixels.
PL_API void pl_plane_data_from_comps(struct pl_plane_data *data, int size[4],
                                     int shift[4]);

// Helper function to take a `pl_plane_data` struct and try and improve its
// alignment to make it more likely to correspond to a real `pl_fmt`. It does
// this by attempting to round each component up to the nearest byte boundary.
// This relies on the assumption (true in practice) that superfluous bits of
// byte-misaligned formats are explicitly set to 0.
//
// The resulting shift must be consistent across all components, in which case
// it's returned in `out_bits`. If no alignment was possible, `out_bits` is set
// to {0}, and this function returns false.
PL_API bool pl_plane_data_align(struct pl_plane_data *data, struct pl_bit_encoding *out_bits);

// Helper function to find a suitable `pl_fmt` based on a pl_plane_data's
// requirements. This is called internally by `pl_upload_plane`, but it's
// exposed to users both as a convenience and so they may pre-emptively check
// if a format would be supported without actually having to attempt the upload.
PL_API pl_fmt pl_plane_find_fmt(pl_gpu gpu, int out_map[4], const struct pl_plane_data *data);

// Upload an image plane to a texture, and output the resulting `pl_plane`
// struct to `out_plane` (optional). `tex` must be a valid pointer to a texture
// (or NULL), which will be destroyed and reinitialized if it does not already
// exist or is incompatible. Returns whether successful.
//
// The resulting texture is guaranteed to be `sampleable`, and it will also try
// and maximize compatibility with the other `pl_renderer` requirements
// (blittable, linear filterable, etc.).
//
// Note: `out_plane->shift_x/y` and `out_plane->flipped` are left
// uninitialized, and should be set explicitly by the user.
PL_API bool pl_upload_plane(pl_gpu gpu, struct pl_plane *out_plane,
                            pl_tex *tex, const struct pl_plane_data *data);

// Like `pl_upload_plane`, but only creates an uninitialized texture object
// rather than actually performing an upload. This can be useful to, for
// example, prepare textures to be used as the target of rendering.
//
// The resulting texture is guaranteed to be `renderable`, and it will also try
// to maximize compatibility with the other `pl_renderer` requirements
// (blittable, storable, etc.).
PL_API bool pl_recreate_plane(pl_gpu gpu, struct pl_plane *out_plane,
                              pl_tex *tex, const struct pl_plane_data *data);

PL_API_END

#endif // LIBPLACEBO_UPLOAD_H_

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