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https://github.com/MaSzyna-EU07/maszyna.git
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Reorganize source files into logical subdirectories
Co-authored-by: Hirek193 <23196899+Hirek193@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot]
207
rendering/flip-s3tc.h
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207
rendering/flip-s3tc.h
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// https://github.com/inequation/flip-s3tc
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// Leszek Godlewski places this file in the public domain.
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#pragma once
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#include <stdint.h>
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#ifdef __cplusplus
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namespace flip_s3tc
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{
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#endif
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#pragma pack(push, 1)
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struct dxt1_block
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{
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uint16_t c0, c1;
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uint8_t dcba,
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hgfe,
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lkji,
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ponm;
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};
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struct dxt23_block
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{
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uint16_t adacabaa,
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ahagafae,
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alakajai,
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apaoanam;
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uint16_t c0, c1;
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uint8_t dcba,
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hgfe,
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lkji,
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ponm;
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};
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struct dxt45_block
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{
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uint8_t a0, a1;
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struct
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{
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uint8_t alpha[3];
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} ahagafaeadacabaa,
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apaoanamalakajai;
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uint16_t c0, c1;
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uint8_t dcba,
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hgfe,
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lkji,
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ponm;
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};
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#pragma pack(pop)
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/** Performs an Y-flip of the given DXT1 block in place. */
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void flip_dxt1_block(struct dxt1_block *block)
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{
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uint8_t temp;
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temp = block->dcba;
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block->dcba = block->ponm;
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block->ponm = temp;
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temp = block->hgfe;
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block->hgfe = block->lkji;
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block->lkji = temp;
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}
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/** Performs an Y-flip of the given DXT2/DXT3 block in place. */
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void flip_dxt23_block(struct dxt23_block *block)
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{
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uint8_t temp8;
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uint16_t temp16;
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temp16 = block->adacabaa;
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block->adacabaa = block->apaoanam;
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block->apaoanam = temp16;
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temp16 = block->ahagafae;
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block->ahagafae = block->alakajai;
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block->alakajai = temp16;
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temp8 = block->dcba;
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block->dcba = block->ponm;
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block->ponm = temp8;
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temp8 = block->hgfe;
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block->hgfe = block->lkji;
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block->lkji = temp8;
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}
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/** Performs an Y-flip of the given DXT4/DXT5 block in place. */
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void flip_dxt45_block(struct dxt45_block *block)
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{
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uint8_t temp8;
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uint32_t temp32;
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uint32_t *as_int[2];
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as_int[0] = (uint32_t *)block->ahagafaeadacabaa.alpha;
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as_int[1] = (uint32_t *)block->apaoanamalakajai.alpha;
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// swap adacabaa with apaoanam
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temp32 = *as_int[0] & ((1 << 12) - 1);
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*as_int[0] &= ~((1 << 12) - 1);
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*as_int[0] |= (*as_int[1] & (((1 << 12) - 1) << 12)) >> 12;
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*as_int[1] &= ~(((1 << 12) - 1) << 12);
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*as_int[1] |= temp32 << 12;
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// swap ahagafae with alakajai
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temp32 = *as_int[0] & (((1 << 12) - 1) << 12);
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*as_int[0] &= ~(((1 << 12) - 1) << 12);
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*as_int[0] |= (*as_int[1] & ((1 << 12) - 1)) << 12;
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*as_int[1] &= ~((1 << 12) - 1);
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*as_int[1] |= temp32 >> 12;
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temp8 = block->dcba;
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block->dcba = block->ponm;
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block->ponm = temp8;
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temp8 = block->hgfe;
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block->hgfe = block->lkji;
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block->lkji = temp8;
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}
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/**
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* Performs an Y-flip on the given DXT1 image in place.
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* @param data buffer with image data (S3TC blocks)
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* @param width image width in pixels
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* @param height image height in pixels
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*/
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void flip_dxt1_image(void *data, int width, int height)
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{
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int x, y;
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struct dxt1_block temp1, temp2;
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struct dxt1_block *blocks = (struct dxt1_block *)data;
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width = (width + 3) / 4;
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height = (height + 3) / 4;
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for (y = 0; y < height / 2; ++y)
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{
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for (x = 0; x < width; ++x)
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{
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temp1 = blocks[y * width + x];
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temp2 = blocks[(height - y - 1) * width + x];
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flip_dxt1_block(&temp1);
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flip_dxt1_block(&temp2);
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blocks[(height - y - 1) * width + x] = temp1;
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blocks[y * width + x] = temp2;
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}
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}
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}
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/**
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* Performs an Y-flip on the given DXT2/DXT3 image in place.
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* @param data buffer with image data (S3TC blocks)
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* @param width image width in pixels
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* @param height image height in pixels
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*/
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void flip_dxt23_image(void *data, int width, int height)
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{
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int x, y;
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struct dxt23_block temp1, temp2;
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struct dxt23_block *blocks = (struct dxt23_block *)data;
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width = (width + 3) / 4;
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height = (height + 3) / 4;
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for (y = 0; y < height / 2; ++y)
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{
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for (x = 0; x < width; ++x)
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{
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temp1 = blocks[y * width + x];
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temp2 = blocks[(height - y - 1) * width + x];
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flip_dxt23_block(&temp1);
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flip_dxt23_block(&temp2);
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blocks[(height - y - 1) * width + x] = temp1;
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blocks[y * width + x] = temp2;
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}
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}
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}
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/**
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* Performs an Y-flip on the given DXT1 image in place.
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* @param data buffer with image data (S3TC blocks)
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* @param width image width in pixels
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* @param height image height in pixels
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*/
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void flip_dxt45_image(void *data, int width, int height)
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{
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int x, y;
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struct dxt45_block temp1, temp2;
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struct dxt45_block *blocks = (struct dxt45_block *)data;
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width = (width + 3) / 4;
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height = (height + 3) / 4;
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for (y = 0; y < height / 2; ++y)
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{
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for (x = 0; x < width; ++x)
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{
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temp1 = blocks[y * width + x];
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temp2 = blocks[(height - y - 1) * width + x];
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flip_dxt45_block(&temp1);
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flip_dxt45_block(&temp2);
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blocks[(height - y - 1) * width + x] = temp1;
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blocks[y * width + x] = temp2;
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}
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}
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}
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#if __cplusplus
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} // namespace flip_s3tc
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#endif
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