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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.
*/
#include "config.h"
#include "VivanteSuperTiledTexture.h"
#if USE(GBM)
namespace WebCore {
// Interleave x and y coordinates to produce Morton code (z-curve index).
static constexpr unsigned interleave(uint32_t x, uint32_t y)
{
uint64_t z = 0;
for (uint32_t i = 0; i < 32; ++i) {
uint32_t xMasked = x & (1 << i);
uint32_t yMasked = y & (1 << i);
z |= static_cast<uint64_t>(xMasked) << i;
z |= static_cast<uint64_t>(yMasked) << (i + 1);
}
return static_cast<unsigned>(z);
}
const VivanteSuperTiledTexture::ZCurveLUT<VivanteSuperTiledTexture::TilesInSuperTileWidth>& VivanteSuperTiledTexture::zCurveTileLUT()
{
static const auto lut = []() {
ZCurveLUT<TilesInSuperTileWidth> result;
for (unsigned y = 0; y < TilesInSuperTileWidth; ++y) {
for (unsigned x = 0; x < TilesInSuperTileWidth; ++x)
result[y][x] = interleave(x, y);
}
return result;
}();
return lut;
}
const VivanteSuperTiledTexture::ZCurveLUT<VivanteSuperTiledTexture::SuperTileWidth>& VivanteSuperTiledTexture::zCurveTexelLUT()
{
static const auto lut = []() {
ZCurveLUT<SuperTileWidth> result;
const auto& tileLUT = zCurveTileLUT();
for (unsigned y = 0; y < SuperTileWidth; ++y) {
unsigned yTileInSuperTile = y / TileWidth;
unsigned yTexelInTile = y % TileWidth;
for (unsigned x = 0; x < SuperTileWidth; ++x) {
unsigned xTileInSuperTile = x / TileWidth;
unsigned xTexelInTile = x % TileWidth;
unsigned tileIndex = tileLUT[yTileInSuperTile][xTileInSuperTile];
result[y][x] = tileIndex * TileTexels + yTexelInTile * TileWidth + xTexelInTile;
}
}
return result;
}();
return lut;
}
} // namespace WebCore
#endif // USE(GBM)
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