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/*
* Copyright (C) 2025 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if USE(GBM)
#include "IntSize.h"
#include <array>
#include <cstdint>
#include <wtf/Noncopyable.h>
namespace WebCore {
// Abstraction layer to access Vivante super-tiled texture buffers.
// Super-tiles are 64x64 texel blocks, subdivided into 4x4 tiles arranged in z-curve (Morton code) order.
class VivanteSuperTiledTexture {
WTF_MAKE_NONCOPYABLE(VivanteSuperTiledTexture);
public:
VivanteSuperTiledTexture(std::span<uint32_t> texels, unsigned stride);
void writeLine(unsigned x, unsigned y, unsigned width, std::span<const uint32_t> colors);
// Align an IntSize to super-tile boundaries (multiple of 64 in both dimensions).
static IntSize alignToSuperTileIntSize(const IntSize& size)
{
return IntSize(alignToSuperTile(size.width()), alignToSuperTile(size.height()));
}
private:
static constexpr unsigned SuperTileWidth = 64;
static constexpr unsigned TileWidth = 4;
static constexpr unsigned TilesInSuperTileWidth = SuperTileWidth / TileWidth;
static constexpr unsigned SuperTileTexels = SuperTileWidth * SuperTileWidth;
static constexpr unsigned TileTexels = TileWidth * TileWidth;
template<unsigned size>
using ZCurveLUT = std::array<std::array<unsigned, size>, size>;
static const ZCurveLUT<TilesInSuperTileWidth>& zCurveTileLUT();
static const ZCurveLUT<SuperTileWidth>& zCurveTexelLUT();
// Align a dimension to super-tile boundary (multiple of 64).
static constexpr unsigned alignToSuperTile(unsigned value)
{
return (value + SuperTileWidth - 1) & ~(SuperTileWidth - 1);
}
std::span<uint32_t> m_texels;
unsigned m_superTilesInStride { 0 };
};
} // namespace WebCore
#endif // USE(GBM)
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