[D3D12] DXT5 decompression shader (not used yet)
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Triang3l
@@ -109,14 +109,13 @@ void XeDXTColorEndpointsTo8In10(uint4 rgb_565, out uint4 rgb_10b_low,
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// Gets the colors of one row of four DXT opaque blocks. Endpoint colors can be
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// obtained using XeDXTColorEndpointsTo8In10 (8 bits with 2 bits of free space
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// between each), weights can be obtained using XeDXTHighColorWeights. Alpha is
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// set to 0 in the result. weights_shift is 0 for the first row, 8 for the
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// second, 16 for the third, and 24 for the fourth.
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void XeDXTFourBlocksRowToRGB8(uint4 rgb_10b_low, uint4 rgb_10b_high,
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uint4 weights_high, uint weights_shift,
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out uint4 row_0, out uint4 row_1,
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out uint4 row_2, out uint4 row_3) {
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// set to 0 in the result. Weights must be shifted right by 8 * row index before
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// calling.
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void XeDXTFourBlocksRowToRGB8(
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uint4 rgb_10b_low, uint4 rgb_10b_high, uint4 weights_high, out uint4 row_0,
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out uint4 row_1, out uint4 row_2, out uint4 row_3) {
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uint4 weights_low = ~weights_high;
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uint4 weights_shifts = weights_shift + uint4(0u, 2u, 4u, 6u);
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const uint4 weights_shifts = uint4(0u, 2u, 4u, 6u);
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uint4 block_row_10b_3x =
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((weights_low.xxxx >> weights_shifts) & 3u) * rgb_10b_low.x +
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((weights_high.xxxx >> weights_shifts) & 3u) * rgb_10b_high.x;
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@@ -145,7 +144,7 @@ void XeDXTFourBlocksRowToRGB8(uint4 rgb_10b_low, uint4 rgb_10b_high,
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// & 0x249249 = bits 0 of 24 bits of DXT5 alpha codes.
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// & 0x492492 = bits 1 of 24 bits of DXT5 alpha codes.
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// & 0x6DB6DB = bits 2 of 24 bits of DXT5 alpha codes.
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// & 0x924924 = bits 2 of 24 bits of DXT5 alpha codes.
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// Sorts half (24 bits) of the codes of four DXT5 alpha blocks so they can be
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// used as weights for the second endpoint, from 0 to 7, in alpha0 > alpha1
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@@ -155,12 +154,11 @@ uint4 XeDXT5High8StepAlphaWeights(uint4 codes_24b) {
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// weights from 6:1 to 1:6. Need to make 001 111, and subtract 1 from 010 and
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// above.
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// Whether the bits are 000 (the first endpoint only).
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uint4 is_first = ((codes_24b & 0x249249u) & ((codes_24b & 0x492492u) >> 1u) &
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((codes_24b & 0x6DB6DBu) >> 2u)) ^ 0x249249u;
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uint4 is_first = ((codes_24b & 0x249249u) | ((codes_24b & 0x492492u) >> 1u) |
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((codes_24b & 0x924924u) >> 2u)) ^ 0x249249u;
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// Whether the bits are 001 (the second endpoint only).
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uint4 is_second =
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(codes_24b & 0x249249u) & (0x249249u ^
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(((codes_24b & 0x492492u) >> 1u) & ((codes_24b & 0x6DB6DBu) >> 2u)));
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uint4 is_second = (codes_24b & 0x249249u) & ~((codes_24b & 0x492492u) >> 1u) &
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~((codes_24b & 0x924924u) >> 2u);
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// Change 000 to 001 so subtracting 1 will result in 0 (and there will never
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// be overflow), subtract 1, and if the code was originally 001 (the second
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// endpoint only), make it 111.
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@@ -183,20 +181,19 @@ uint4 XeDXT5High6StepAlphaWeights(uint4 codes_24b) {
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// 111 - constant 1.
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// Create 3-bit masks (111 or 000) of whether the codes represent 0 or 1
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// constants to keep them 110 and 111 later.
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uint4 is_constant = (codes_24b & 0x492492u) & ((codes_24b & 0x6DB6DBu) >> 1u);
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uint4 is_constant = codes_24b & 0x492492u & ((codes_24b & 0x924924u) >> 1u);
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is_constant |= (is_constant << 1u) | (is_constant >> 1u);
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// Store the codes for the constants (110 or 111), or 0 if not a constant.
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uint4 constant_values =
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((codes_24b & 0x249249u) | (0x492492u | 0x6DB6DBu)) & is_constant;
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((codes_24b & 0x249249u) | (0x492492u | 0x924924u)) & is_constant;
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// Need to make 001 101, and subtract 1 from 010 and above (constants will be
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// handled separately later).
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// Whether the bits are 000 (the first endpoint only).
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uint4 is_first = ((codes_24b & 0x249249u) & ((codes_24b & 0x492492u) >> 1u) &
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((codes_24b & 0x6DB6DBu) >> 2u)) ^ 0x249249u;
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uint4 is_first = ((codes_24b & 0x249249u) | ((codes_24b & 0x492492u) >> 1u) |
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((codes_24b & 0x924924u) >> 2u)) ^ 0x249249u;
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// Whether the bits are 001 (the second endpoint only).
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uint4 is_second =
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(codes_24b & 0x249249u) & (0x249249u ^
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(((codes_24b & 0x492492u) >> 1u) & ((codes_24b & 0x6DB6DBu) >> 2u)));
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uint4 is_second = (codes_24b & 0x249249u) & ~((codes_24b & 0x492492u) >> 1u) &
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~((codes_24b & 0x924924u) >> 2u);
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// Change 000 to 001 so subtracting 1 will result in 0 (and there will never
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// be overflow), subtract 1, and if the code was originally 001 (the second
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// endpoint only), make it 101.
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@@ -206,4 +203,41 @@ uint4 XeDXT5High6StepAlphaWeights(uint4 codes_24b) {
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return (codes_24b & ~is_constant) | constant_values;
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}
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uint4 XeDXT5Four8StepBlocksRowToA8(uint4 end_low, uint4 end_high,
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uint4 weights_8step, uint4 weights_6step) {
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// Choose the mode.
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bool4 is_6step = end_low <= end_high;
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uint4 weights_high = is_6step ? weights_6step : weights_8step;
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uint4 weight_max = is_6step ? (5u.xxxx) : (7u.xxxx);
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// In the 6-step mode, make a mask for whether the weights are constants.
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uint4 is_constant = is_6step ? (weights_6step & 0x492u &
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((weights_6step & 0x924u) >> 1u))
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: (0u).xxxx;
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is_constant |= (is_constant << 1u) | (is_constant >> 1u);
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// Get the weights for the first endpoint and remove constant from the
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// interpolation (set weights of the endpoints to 0 for them). First need to
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// zero the weights of the second endpoint so 6 or 7 won't be subtracted from
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// 5 while getting the weights of the first endpoint.
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weights_high &= ~is_constant;
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uint4 weights_low = ((weight_max * 0x249u) - weights_high) & ~is_constant;
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// Interpolate.
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uint4 row =
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((end_low * (weights_low & 7u) +
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end_high * (weights_high & 7u)) / weight_max) |
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(((end_low * ((weights_low >> 3u) & 7u) +
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end_high * ((weights_high >> 3u) & 7u)) / weight_max) << 8u) |
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(((end_low * ((weights_low >> 6u) & 7u) +
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end_high * ((weights_high >> 6u) & 7u)) / weight_max) << 16u) |
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(((end_low * ((weights_low >> 9u) & 7u) +
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end_high * ((weights_high >> 9u) & 7u)) / weight_max) << 24u);
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// Get the constant values as 1 bit per pixel separated by 7 bits.
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uint4 constant_values = weights_6step & is_constant;
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constant_values = (constant_values & 1u) |
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((constant_values & (1u << 3u)) << (8u - 3u)) |
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((constant_values & (1u << 6u)) << (16u - 6u)) |
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((constant_values & (1u << 9u)) << (24u - 9u));
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// Add constant 1 where needed.
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return row + constant_values * 0xFFu;
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}
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#endif // XENIA_GPU_D3D12_SHADERS_PIXEL_FORMATS_HLSLI_
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