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86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <string>
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#include "common/common_types.h"
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namespace VideoCore {
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/// Structure for the TGA texture format (for dumping)
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struct TGAHeader {
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char idlength;
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char colormaptype;
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char datatypecode;
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short int colormaporigin;
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short int colormaplength;
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short int x_origin;
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short int y_origin;
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short width;
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short height;
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char bitsperpixel;
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char imagedescriptor;
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};
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/**
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* Dumps a texture to TGA
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* @param filename String filename to dump texture to
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* @param width Width of texture in pixels
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* @param height Height of texture in pixels
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* @param raw_data Raw RGBA8 texture data to dump
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* @todo This should be moved to some general purpose/common code
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*/
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void DumpTGA(std::string filename, short width, short height, u8* raw_data);
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/**
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* Interleave the lower 3 bits of each coordinate to get the intra-block offsets, which are
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* arranged in a Z-order curve. More details on the bit manipulation at:
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* https://fgiesen.wordpress.com/2009/12/13/decoding-morton-codes/
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*/
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static inline u32 MortonInterleave(u32 x, u32 y) {
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u32 i = (x & 7) | ((y & 7) << 8); // ---- -210
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i = (i ^ (i << 2)) & 0x1313; // ---2 --10
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i = (i ^ (i << 1)) & 0x1515; // ---2 -1-0
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i = (i | (i >> 7)) & 0x3F;
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return i;
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}
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/**
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* Calculates the offset of the position of the pixel in Morton order
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*/
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static inline u32 GetMortonOffset(u32 x, u32 y, u32 bytes_per_pixel) {
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// Images are split into 8x8 tiles. Each tile is composed of four 4x4 subtiles each
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// of which is composed of four 2x2 subtiles each of which is composed of four texels.
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// Each structure is embedded into the next-bigger one in a diagonal pattern, e.g.
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// texels are laid out in a 2x2 subtile like this:
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// 2 3
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// 0 1
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//
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// The full 8x8 tile has the texels arranged like this:
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//
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// 42 43 46 47 58 59 62 63
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// 40 41 44 45 56 57 60 61
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// 34 35 38 39 50 51 54 55
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// 32 33 36 37 48 49 52 53
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// 10 11 14 15 26 27 30 31
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// 08 09 12 13 24 25 28 29
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// 02 03 06 07 18 19 22 23
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// 00 01 04 05 16 17 20 21
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//
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// This pattern is what's called Z-order curve, or Morton order.
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const unsigned int block_height = 8;
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const unsigned int coarse_x = x & ~7;
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u32 i = VideoCore::MortonInterleave(x, y);
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const unsigned int offset = coarse_x * block_height;
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return (i + offset) * bytes_per_pixel;
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}
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} // namespace
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