339 lines
9.9 KiB
C++
339 lines
9.9 KiB
C++
namespace gli{
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namespace detail
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{
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inline void flip(image ImageDst, image ImageSrc, size_t BlockSize)
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{
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size_t const LineSize = BlockSize * ImageDst.extent().x;
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for(int y = 0; y < ImageDst.extent().y; ++y)
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{
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size_t OffsetDst = LineSize * y;
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size_t OffsetSrc = ImageSrc.size() - (LineSize * (y + 1));
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memcpy(
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ImageDst.data<glm::byte>() + OffsetDst,
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ImageSrc.data<glm::byte>() + OffsetSrc,
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LineSize);
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}
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}
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struct dxt1_block
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{
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uint16_t Color0;
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uint16_t Color1;
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uint8_t Row0;
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uint8_t Row1;
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uint8_t Row2;
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uint8_t Row3;
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};
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struct dxt3_block
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{
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uint16_t AlphaRow0;
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uint16_t AlphaRow1;
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uint16_t AlphaRow2;
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uint16_t AlphaRow3;
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uint16_t Color0;
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uint16_t Color1;
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uint8_t Row0;
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uint8_t Row1;
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uint8_t Row2;
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uint8_t Row3;
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};
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struct dxt5_block
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{
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uint8_t Alpha0;
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uint8_t Alpha1;
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uint8_t AlphaR0;
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uint8_t AlphaR1;
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uint8_t AlphaR2;
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uint8_t AlphaR3;
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uint8_t AlphaR4;
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uint8_t AlphaR5;
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uint16_t Color0;
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uint16_t Color1;
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uint8_t Row0;
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uint8_t Row1;
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uint8_t Row2;
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uint8_t Row3;
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};
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inline void flip_block_s3tc(uint8_t* BlockDst, uint8_t* BlockSrc, format Format, bool HeightTwo)
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{
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// There is no distinction between RGB and RGBA in DXT-compressed textures,
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// it is used only to tell OpenGL how to interpret the data.
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// Moreover, in DXT1 (which does not contain an alpha channel), transparency can be emulated
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// using Color0 and Color1 on a per-compression-block basis.
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// There is no difference in how textures with and without transparency are laid out in the file,
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// so they can be flipped using the same method.
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if(Format == FORMAT_RGB_DXT1_UNORM_BLOCK8 || Format == FORMAT_RGB_DXT1_SRGB_BLOCK8
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|| Format == FORMAT_RGBA_DXT1_UNORM_BLOCK8 || Format == FORMAT_RGBA_DXT1_SRGB_BLOCK8)
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{
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dxt1_block* Src = reinterpret_cast<dxt1_block*>(BlockSrc);
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dxt1_block* Dst = reinterpret_cast<dxt1_block*>(BlockDst);
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if(HeightTwo)
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{
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Dst->Color0 = Src->Color0;
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Dst->Color1 = Src->Color1;
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Dst->Row0 = Src->Row1;
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Dst->Row1 = Src->Row0;
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Dst->Row2 = Src->Row2;
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Dst->Row3 = Src->Row3;
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return;
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}
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Dst->Color0 = Src->Color0;
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Dst->Color1 = Src->Color1;
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Dst->Row0 = Src->Row3;
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Dst->Row1 = Src->Row2;
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Dst->Row2 = Src->Row1;
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Dst->Row3 = Src->Row0;
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return;
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}
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// DXT3
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if(Format == FORMAT_RGBA_DXT3_UNORM_BLOCK16 || Format == FORMAT_RGBA_DXT3_SRGB_BLOCK16)
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{
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dxt3_block* Src = reinterpret_cast<dxt3_block*>(BlockSrc);
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dxt3_block* Dst = reinterpret_cast<dxt3_block*>(BlockDst);
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if(HeightTwo)
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{
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Dst->AlphaRow0 = Src->AlphaRow1;
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Dst->AlphaRow1 = Src->AlphaRow0;
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Dst->AlphaRow2 = Src->AlphaRow2;
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Dst->AlphaRow3 = Src->AlphaRow3;
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Dst->Color0 = Src->Color0;
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Dst->Color1 = Src->Color1;
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Dst->Row0 = Src->Row1;
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Dst->Row1 = Src->Row0;
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Dst->Row2 = Src->Row2;
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Dst->Row3 = Src->Row3;
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return;
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}
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Dst->AlphaRow0 = Src->AlphaRow3;
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Dst->AlphaRow1 = Src->AlphaRow2;
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Dst->AlphaRow2 = Src->AlphaRow1;
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Dst->AlphaRow3 = Src->AlphaRow0;
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Dst->Color0 = Src->Color0;
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Dst->Color1 = Src->Color1;
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Dst->Row0 = Src->Row3;
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Dst->Row1 = Src->Row2;
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Dst->Row2 = Src->Row1;
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Dst->Row3 = Src->Row0;
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return;
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}
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// DXT5
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if(Format == FORMAT_RGBA_DXT5_UNORM_BLOCK16 || Format == FORMAT_RGBA_DXT5_SRGB_BLOCK16)
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{
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dxt5_block* Src = reinterpret_cast<dxt5_block*>(BlockSrc);
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dxt5_block* Dst = reinterpret_cast<dxt5_block*>(BlockDst);
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if(HeightTwo)
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{
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Dst->Alpha0 = Src->Alpha0;
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Dst->Alpha1 = Src->Alpha1;
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// operator+ has precedence over operator>> and operator<<, hence the parentheses. very important!
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// the values below are bitmasks used to retrieve alpha values according to the DXT specification
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// 0xF0 == 0b11110000 and 0xF == 0b1111
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Dst->AlphaR0 = ((Src->AlphaR1 & 0xF0) >> 4) + ((Src->AlphaR2 & 0xF) << 4);
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Dst->AlphaR1 = ((Src->AlphaR2 & 0xF0) >> 4) + ((Src->AlphaR0 & 0xF) << 4);
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Dst->AlphaR2 = ((Src->AlphaR0 & 0xF0) >> 4) + ((Src->AlphaR1 & 0xF) << 4);
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Dst->AlphaR3 = Src->AlphaR3;
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Dst->AlphaR4 = Src->AlphaR4;
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Dst->AlphaR5 = Src->AlphaR5;
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Dst->Color0 = Src->Color0;
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Dst->Color1 = Src->Color1;
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Dst->Row0 = Src->Row1;
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Dst->Row1 = Src->Row0;
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Dst->Row2 = Src->Row2;
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Dst->Row3 = Src->Row3;
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return;
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}
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Dst->Alpha0 = Src->Alpha0;
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Dst->Alpha1 = Src->Alpha1;
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// operator+ has precedence over operator>> and operator<<, hence the parentheses. very important!
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// the values below are bitmasks used to retrieve alpha values according to the DXT specification
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// 0xF0 == 0b11110000 and 0xF == 0b1111
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Dst->AlphaR0 = ((Src->AlphaR4 & 0xF0) >> 4) + ((Src->AlphaR5 & 0xF) << 4);
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Dst->AlphaR1 = ((Src->AlphaR5 & 0xF0) >> 4) + ((Src->AlphaR3 & 0xF) << 4);
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Dst->AlphaR2 = ((Src->AlphaR3 & 0xF0) >> 4) + ((Src->AlphaR4 & 0xF) << 4);
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Dst->AlphaR3 = ((Src->AlphaR1 & 0xF0) >> 4) + ((Src->AlphaR2 & 0xF) << 4);
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Dst->AlphaR4 = ((Src->AlphaR2 & 0xF0) >> 4) + ((Src->AlphaR0 & 0xF) << 4);
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Dst->AlphaR5 = ((Src->AlphaR0 & 0xF0) >> 4) + ((Src->AlphaR1 & 0xF) << 4);
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Dst->Color0 = Src->Color0;
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Dst->Color1 = Src->Color1;
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Dst->Row0 = Src->Row3;
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Dst->Row1 = Src->Row2;
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Dst->Row2 = Src->Row1;
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Dst->Row3 = Src->Row0;
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return;
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}
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// invalid format specified (unknown S3TC format?)
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assert(false);
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}
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inline void flip_s3tc(image ImageDst, image ImageSrc, format Format)
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{
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if(ImageSrc.extent().y == 1)
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{
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memcpy(ImageDst.data(),
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ImageSrc.data(),
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ImageSrc.size());
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return;
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}
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std::size_t const XBlocks = ImageSrc.extent().x <= 4 ? 1 : ImageSrc.extent().x / 4;
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if(ImageSrc.extent().y == 2)
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{
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for(std::size_t i_block = 0; i_block < XBlocks; ++i_block)
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flip_block_s3tc(ImageDst.data<uint8_t>() + i_block * block_size(Format), ImageSrc.data<uint8_t>() + i_block * block_size(Format), Format, true);
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return;
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}
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std::size_t const MaxYBlock = ImageSrc.extent().y / 4 - 1;
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for(std::size_t i_row = 0; i_row <= MaxYBlock; ++i_row)
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for(std::size_t i_block = 0; i_block < XBlocks; ++i_block)
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flip_block_s3tc(ImageDst.data<uint8_t>() + (MaxYBlock - i_row) * block_size(Format) * XBlocks + i_block * block_size(Format), ImageSrc.data<uint8_t>() + i_row * block_size(Format) * XBlocks + i_block * block_size(Format), Format, false);
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}
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}//namespace detail
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/*
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template <>
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inline image flip(image const & Image)
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{
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}
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*/
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template <>
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inline texture2d flip(texture2d const& Texture)
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{
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GLI_ASSERT(!gli::is_compressed(Texture.format()) || gli::is_s3tc_compressed(Texture.format()));
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texture2d Flip(Texture.format(), Texture.extent(), Texture.levels());
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if(!is_compressed(Texture.format()))
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{
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texture2d::size_type const BlockSize = block_size(Texture.format());
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for(texture2d::size_type Level = 0; Level < Flip.levels(); ++Level)
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detail::flip(Flip[Level], Texture[Level], BlockSize);
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}
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else
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for(texture2d::size_type Level = 0; Level < Flip.levels(); ++Level)
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detail::flip_s3tc(Flip[Level], Texture[Level], Texture.format());
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return Flip;
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}
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template <>
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inline texture2d_array flip(texture2d_array const& Texture)
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{
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GLI_ASSERT(!gli::is_compressed(Texture.format()) || gli::is_s3tc_compressed(Texture.format()));
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texture2d_array Flip(Texture.format(), Texture.extent(), Texture.layers(), Texture.levels());
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if(!gli::is_compressed(Texture.format()))
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{
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texture2d_array::size_type const BlockSize = block_size(Texture.format());
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for(texture2d_array::size_type Layer = 0; Layer < Flip.layers(); ++Layer)
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for(texture2d_array::size_type Level = 0; Level < Flip.levels(); ++Level)
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detail::flip(Flip[Layer][Level], Texture[Layer][Level], BlockSize);
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}
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else
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for(texture2d_array::size_type Layer = 0; Layer < Flip.layers(); ++Layer)
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for(texture2d_array::size_type Level = 0; Level < Flip.levels(); ++Level)
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detail::flip_s3tc(Flip[Layer][Level], Texture[Layer][Level], Texture.format());
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return Flip;
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}
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template <>
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inline texture_cube flip(texture_cube const & Texture)
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{
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GLI_ASSERT(!gli::is_compressed(Texture.format()) || gli::is_s3tc_compressed(Texture.format()));
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texture_cube Flip(Texture.format(), Texture.extent(), Texture.levels());
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if(!gli::is_compressed(Texture.format()))
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{
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texture_cube::size_type const BlockSize = block_size(Texture.format());
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for(texture_cube::size_type Face = 0; Face < Flip.faces(); ++Face)
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for(texture_cube::size_type Level = 0; Level < Flip.levels(); ++Level)
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detail::flip(Flip[Face][Level], Texture[Face][Level], BlockSize);
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}
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else
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for(texture_cube::size_type Face = 0; Face < Flip.faces(); ++Face)
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for(texture_cube::size_type Level = 0; Level < Flip.levels(); ++Level)
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detail::flip_s3tc(Flip[Face][Level], Texture[Face][Level], Texture.format());
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return Flip;
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}
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template <>
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inline texture_cube_array flip(texture_cube_array const & Texture)
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{
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assert(!is_compressed(Texture.format()) || is_s3tc_compressed(Texture.format()));
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texture_cube_array Flip(Texture.format(), Texture.extent(), Texture.layers(), Texture.levels());
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if(!is_compressed(Texture.format()))
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{
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gli::size_t const BlockSize = block_size(Texture.format());
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for(std::size_t Layer = 0; Layer < Flip.layers(); ++Layer)
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for(std::size_t Face = 0; Face < Flip.faces(); ++Face)
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for(std::size_t Level = 0; Level < Flip.levels(); ++Level)
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detail::flip(Flip[Layer][Face][Level], Texture[Layer][Face][Level], BlockSize);
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}
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else
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for(std::size_t Layer = 0; Layer < Flip.layers(); ++Layer)
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for(std::size_t Face = 0; Face < Flip.faces(); ++Face)
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for(std::size_t Level = 0; Level < Flip.levels(); ++Level)
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detail::flip_s3tc(Flip[Layer][Face][Level], Texture[Layer][Face][Level], Texture.format());
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return Flip;
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}
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template <>
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inline texture flip(texture const & Texture)
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{
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switch(Texture.target())
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{
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case TARGET_2D:
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return flip(texture2d(Texture));
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case TARGET_2D_ARRAY:
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return flip(texture2d_array(Texture));
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case TARGET_CUBE:
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return flip(texture_cube(Texture));
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case TARGET_CUBE_ARRAY:
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return flip(texture_cube_array(Texture));
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default:
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assert(false && "Texture target does not support flipping.");
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return Texture;
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}
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}
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}//namespace gli
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