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Unify comments for ImageDraw shuffle

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doyle 2020-07-07 22:48:48 +10:00
parent eace25611c
commit e952fa0b3b
1 changed files with 52 additions and 34 deletions
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86
RaylibSIMD.h
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@ -354,27 +354,47 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
// of all color components to avoid branches in the blitting // of all color components to avoid branches in the blitting
// hot path. // hot path.
// NOTE: R8G8B8 24bit Pixel
// Bits | 23 22 21 20 19 18 17 16 | 15 14 13 12 11 10 9 8 | 7654 3210
// Color Bits | R R R R R R R R | G G G G G G G G | BBBB BBBB
//
// A 128bit SIMD register with 4x32bit lanes can store
// 1 pixel per register and the red channel of the next
// pixel.
//
// Pixel | 1 2 3 4 5 6
// Register | {[RGBR] [GBRG] [BRGB] [RGBR]}
//
// Desired layout 1 pixel per 32 bit lane
//
// Pixel | 1 2 3 4
// Register | {[RGB.] [RGB.] [RGB.] [RGB.]]}
// Bits | [0:23] [24:47] [48:71] [72:95]
// Bytes (Shuffle) | [0:2] [3:5] [6:8] [9:11]
src_alpha_min = 255.f; src_alpha_min = 255.f;
src_pixels_shuffle = _mm_setr_epi8(0, 1, 2, 3, 3, 4, 5, 6, 6, 7, 8, 9, 9, 10, 11, 12); src_pixels_shuffle = _mm_setr_epi8(0, 1, 2, 0, // Lane 1
3, 4, 5, 0,
6, 7, 8, 0,
9, 10, 11, 0);
} }
else if (srcPtr->format == UNCOMPRESSED_R5G6B5) else if (srcPtr->format == UNCOMPRESSED_R5G6B5)
{ {
// NOTE: For a 128bit SIMD register with 4 lanes of 32 bits, // NOTE: RGB565 16bit Pixel
// we can store 2 pixels per register. // Bits | 15 14 13 12 11 | 10 98765 | 43210
// Color Bits | R R R R R | G GGGGG | BBBBB
// //
// RGB565 Pixel // A 128bit SIMD register with 4x32bit lanes can store
// Bits | 01234 | 56789 10 | 11 12 13 14 15 // 2 pixels per register.
// Color Bits | RRRRR | GGGGG G | B B B B B
// //
// Register | {[P1, P2] [P3, P4] [P5, P6] [P7, P8]} // Register | {[P1, P2] [P3, P4] [P5, P6] [P7, P8]}
// //
// See UNCOMPRESSED_R8G8B8 for reason for shuffle. Our // See UNCOMPRESSED_R8G8B8 for reason for shuffle.
// desired pattern is 1 pixel per lane for color blending in // Desired layout 1 pixel per 32 bit lane
// [0, 1] normalized 32bit float space.
// //
// Register | {[P1] [P2] [P3] [P4]} // Register | {[P1] [P2] [P3] [P4]}
// Bits | [0:15] [16:31] [32:46] [46:61] // Bits | [0:15] [16:31] [32:46] [46:61]
// Bytes | [0:1] [2:3] [4:5] [6:7] // Bytes (Shuffle) | [0:1] [2:3] [4:5] [6:7]
r_bit_shift = 11; r_bit_shift = 11;
g_bit_shift = 5; g_bit_shift = 5;
@ -396,22 +416,21 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
} }
else if (srcPtr->format == UNCOMPRESSED_R5G5B5A1) else if (srcPtr->format == UNCOMPRESSED_R5G5B5A1)
{ {
// NOTE: For a 128bit SIMD register with 4 lanes of 32 bits, // NOTE: RGBA5551 16bit Pixel
// we can store 2 pixels per register. // Bits | 15 14 13 12 11 | 10 9876 | 54321 | 0
// Color Bits | R R R R R | G GGGG | BBBBB | A
// //
// RGBA5551 Pixel // A 128bit SIMD register with 4x32bit lanes can store
// Bits | 01234 | 56789 | 10 11 12 13 14 | 15 // 2 pixels per register.
// Color Bits | RRRRR | GGGGG | B B B B B | A
// //
// Register | {[P1, P2] [P3, P4] [P5, P6] [P7, P8]} // Register | {[P1, P2] [P3, P4] [P5, P6] [P7, P8]}
// //
// See UNCOMPRESSED_R8G8B8 for reason for shuffle. Our // See UNCOMPRESSED_R8G8B8 for reason for shuffle.
// desired pattern is 1 pixel per lane for color blending in // Desired layout 1 pixel per 32 bit lane
// [0, 1] normalized 32bit float space.
// //
// Register | {[P1] [P2] [P3] [P4]} // Register | {[P1] [P2] [P3] [P4]}
// Bits | [0:15] [16:31] [32:46] [46:61] // Bits | [0:15] [16:31] [32:46] [46:61]
// Bytes | [0:1] [2:3] [4:5] [6:7] // Bytes (Shuffle) | [0:1] [2:3] [4:5] [6:7]
r_bit_shift = 11; r_bit_shift = 11;
g_bit_shift = 6; g_bit_shift = 6;
@ -435,22 +454,21 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
} }
else if (srcPtr->format == UNCOMPRESSED_R4G4B4A4) else if (srcPtr->format == UNCOMPRESSED_R4G4B4A4)
{ {
// NOTE: For a 128bit SIMD register with 4 lanes of 32 bits, // NOTE: RGBA4444 16bit Pixel
// we can store 2 16bit pixels per register. // Bits | 15 14 13 12 | 11 10 98 | 7654 | 3210
// Color Bits | R R R R | G G GG | BBBB | AAAA
// //
// RGBA5551 Pixel // A 128bit SIMD register with 4x32bit lanes can store
// Bits | 0123 | 4567 | 89 10 11 | 12 13 14 15 // 2 pixels per register.
// Color Bits | RRRR | GGGG | BB B B | A A A A
// //
// Register | {[P1, P2] [P3, P4] [P5, P6] [P7, P8]} // Register | {[P1, P2] [P3, P4] [P5, P6] [P7, P8]}
// //
// See UNCOMPRESSED_R8G8B8 for reason for shuffle. Our // See UNCOMPRESSED_R8G8B8 for reason for shuffle.
// desired pattern is 1 pixel per lane for color blending in // Desired layout 1 pixel per 32 bit lane
// [0, 1] normalized 32bit float space.
// //
// Register | {[P1] [P2] [P3] [P4]} // Register | {[P1] [P2] [P3] [P4]}
// Bits | [0:15] [16:31] [32:46] [46:61] // Bits | [0:15] [16:31] [32:46] [46:61]
// Bytes | [0:1] [2:3] [4:5] [6:7] // Bytes (Shuffle) | [0:1] [2:3] [4:5] [6:7]
r_bit_shift = 12; r_bit_shift = 12;
g_bit_shift = 8; g_bit_shift = 8;