69 lines
2.8 KiB
C++
69 lines
2.8 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2018 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#ifndef XENIA_GPU_TEXTURE_UTIL_H_
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#define XENIA_GPU_TEXTURE_UTIL_H_
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#include <algorithm>
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#include "xenia/base/math.h"
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#include "xenia/gpu/texture_info.h"
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namespace xe {
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namespace gpu {
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namespace texture_util {
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// This namespace replaces texture_extent and most of texture_info for
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// simplicity.
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// Calculates width, height and depth of the image backing the guest mipmap (or
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// the base level if mip is 0).
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void GetGuestMipBlocks(Dimension dimension, uint32_t width, uint32_t height,
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uint32_t depth, TextureFormat format, uint32_t mip,
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uint32_t& width_blocks_out, uint32_t& height_blocks_out,
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uint32_t& depth_blocks_out);
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// Calculates the number of bytes required to store a single mip level - width,
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// height and depth must be obtained via GetGuestMipExtent.
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uint32_t GetGuestMipStorageSize(uint32_t width_blocks, uint32_t height_blocks,
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uint32_t depth_blocks, bool is_tiled,
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TextureFormat format, uint32_t* row_pitch_out);
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// Gets the number of the mipmap level where the packed mips are stored.
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inline uint32_t GetPackedMipLevel(uint32_t width, uint32_t height) {
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uint32_t log2_size = xe::log2_ceil(std::min(width, height));
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return log2_size > 4 ? log2_size - 4 : 0;
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}
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// Gets the offset of the mipmap within the tail in blocks, or zeros (and
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// returns false) if the mip level is not packed. Width, height and depth are in
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// texels. For non-3D textures, set depth to 1.
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bool GetPackedMipOffset(uint32_t width, uint32_t height, uint32_t depth,
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TextureFormat format, uint32_t mip, uint32_t& x_blocks,
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uint32_t& y_blocks, uint32_t& z_blocks);
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// Calculates the index of the smallest mip (1x1x1 for unpacked or min(w,h)<=16
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// packed mips) for a texture. For non-3D textures, set the depth to 1.
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inline uint32_t GetSmallestMipLevel(uint32_t width, uint32_t height,
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uint32_t depth, bool packed_mips) {
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uint32_t size = std::max(width, height);
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size = std::max(size, depth);
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uint32_t smallest_mip = xe::log2_ceil(size);
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if (packed_mips) {
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smallest_mip = std::min(smallest_mip, GetPackedMipLevel(width, height));
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}
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return smallest_mip;
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}
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} // namespace texture_util
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} // namespace gpu
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} // namespace xe
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#endif // XENIA_GPU_TEXTURE_UTIL_H_
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