// SPDX-License-Identifier: GPL-2.0-only OR Apache-2.0

#include "rockchip_av1_filmgrain.h"

static const s32 gaussian_sequence[2048] = {
	56, 568, -180, 172, 124, -84, 172, -64, -900, 24, 820,
	224, 1248, 996, 272, -8, -916, -388, -732, -104, -188, 800,
	112, -652, -320, -376, 140, -252, 492, -168, 44, -788, 588,
	-584, 500, -228, 12, 680, 272, -476, 972, -100, 652, 368,
	432, -196, -720, -192, 1000, -332, 652, -136, -552, -604, -4,
	192, -220, -136, 1000, -52, 372, -96, -624, 124, -24, 396,
	540, -12, -104, 640, 464, 244, -208, -84, 368, -528, -740,
	248, -968, -848, 608, 376, -60, -292, -40, -156, 252, -292,
	248, 224, -280, 400, -244, 244, -60, 76, -80, 212, 532,
	340, 128, -36, 824, -352, -60, -264, -96, -612, 416, -704,
	220, -204, 640, -160, 1220, -408, 900, 336, 20, -336, -96,
	-792, 304, 48, -28, -1232, -1172, -448, 104, -292, -520, 244,
	60, -948, 0, -708, 268, 108, 356, -548, 488, -344, -136,
	488, -196, -224, 656, -236, -1128, 60, 4, 140, 276, -676,
	-376, 168, -108, 464, 8, 564, 64, 240, 308, -300, -400,
	-456, -136, 56, 120, -408, -116, 436, 504, -232, 328, 844,
	-164, -84, 784, -168, 232, -224, 348, -376, 128, 568, 96,
	-1244, -288, 276, 848, 832, -360, 656, 464, -384, -332, -356,
	728, -388, 160, -192, 468, 296, 224, 140, -776, -100, 280,
	4, 196, 44, -36, -648, 932, 16, 1428, 28, 528, 808,
	772, 20, 268, 88, -332, -284, 124, -384, -448, 208, -228,
	-1044, -328, 660, 380, -148, -300, 588, 240, 540, 28, 136,
	-88, -436, 256, 296, -1000, 1400, 0, -48, 1056, -136, 264,
	-528, -1108, 632, -484, -592, -344, 796, 124, -668, -768, 388,
	1296, -232, -188, -200, -288, -4, 308, 100, -168, 256, -500,
	204, -508, 648, -136, 372, -272, -120, -1004, -552, -548, -384,
	548, -296, 428, -108, -8, -912, -324, -224, -88, -112, -220,
	-100, 996, -796, 548, 360, -216, 180, 428, -200, -212, 148,
	96, 148, 284, 216, -412, -320, 120, -300, -384, -604, -572,
	-332, -8, -180, -176, 696, 116, -88, 628, 76, 44, -516,
	240, -208, -40, 100, -592, 344, -308, -452, -228, 20, 916,
	-1752, -136, -340, -804, 140, 40, 512, 340, 248, 184, -492,
	896, -156, 932, -628, 328, -688, -448, -616, -752, -100, 560,
	-1020, 180, -800, -64, 76, 576, 1068, 396, 660, 552, -108,
	-28, 320, -628, 312, -92, -92, -472, 268, 16, 560, 516,
	-672, -52, 492, -100, 260, 384, 284, 292, 304, -148, 88,
	-152, 1012, 1064, -228, 164, -376, -684, 592, -392, 156, 196,
	-524, -64, -884, 160, -176, 636, 648, 404, -396, -436, 864,
	424, -728, 988, -604, 904, -592, 296, -224, 536, -176, -920,
	436, -48, 1176, -884, 416, -776, -824, -884, 524, -548, -564,
	-68, -164, -96, 692, 364, -692, -1012, -68, 260, -480, 876,
	-1116, 452, -332, -352, 892, -1088, 1220, -676, 12, -292, 244,
	496, 372, -32, 280, 200, 112, -440, -96, 24, -644, -184,
	56, -432, 224, -980, 272, -260, 144, -436, 420, 356, 364,
	-528, 76, 172, -744, -368, 404, -752, -416, 684, -688, 72,
	540, 416, 92, 444, 480, -72, -1416, 164, -1172, -68, 24,
	424, 264, 1040, 128, -912, -524, -356, 64, 876, -12, 4,
	-88, 532, 272, -524, 320, 276, -508, 940, 24, -400, -120,
	756, 60, 236, -412, 100, 376, -484, 400, -100, -740, -108,
	-260, 328, -268, 224, -200, -416, 184, -604, -564, -20, 296,
	60, 892, -888, 60, 164, 68, -760, 216, -296, 904, -336,
	-28, 404, -356, -568, -208, -1480, -512, 296, 328, -360, -164,
	-1560, -776, 1156, -428, 164, -504, -112, 120, -216, -148, -264,
	308, 32, 64, -72, 72, 116, 176, -64, -272, 460, -536,
	-784, -280, 348, 108, -752, -132, 524, -540, -776, 116, -296,
	-1196, -288, -560, 1040, -472, 116, -848, -1116, 116, 636, 696,
	284, -176, 1016, 204, -864, -648, -248, 356, 972, -584, -204,
	264, 880, 528, -24, -184, 116, 448, -144, 828, 524, 212,
	-212, 52, 12, 200, 268, -488, -404, -880, 824, -672, -40,
	908, -248, 500, 716, -576, 492, -576, 16, 720, -108, 384,
	124, 344, 280, 576, -500, 252, 104, -308, 196, -188, -8,
	1268, 296, 1032, -1196, 436, 316, 372, -432, -200, -660, 704,
	-224, 596, -132, 268, 32, -452, 884, 104, -1008, 424, -1348,
	-280, 4, -1168, 368, 476, 696, 300, -8, 24, 180, -592,
	-196, 388, 304, 500, 724, -160, 244, -84, 272, -256, -420,
	320, 208, -144, -156, 156, 364, 452, 28, 540, 316, 220,
	-644, -248, 464, 72, 360, 32, -388, 496, -680, -48, 208,
	-116, -408, 60, -604, -392, 548, -840, 784, -460, 656, -544,
	-388, -264, 908, -800, -628, -612, -568, 572, -220, 164, 288,
	-16, -308, 308, -112, -636, -760, 280, -668, 432, 364, 240,
	-196, 604, 340, 384, 196, 592, -44, -500, 432, -580, -132,
	636, -76, 392, 4, -412, 540, 508, 328, -356, -36, 16,
	-220, -64, -248, -60, 24, -192, 368, 1040, 92, -24, -1044,
	-32, 40, 104, 148, 192, -136, -520, 56, -816, -224, 732,
	392, 356, 212, -80, -424, -1008, -324, 588, -1496, 576, 460,
	-816, -848, 56, -580, -92, -1372, -112, -496, 200, 364, 52,
	-140, 48, -48, -60, 84, 72, 40, 132, -356, -268, -104,
	-284, -404, 732, -520, 164, -304, -540, 120, 328, -76, -460,
	756, 388, 588, 236, -436, -72, -176, -404, -316, -148, 716,
	-604, 404, -72, -88, -888, -68, 944, 88, -220, -344, 960,
	472, 460, -232, 704, 120, 832, -228, 692, -508, 132, -476,
	844, -748, -364, -44, 1116, -1104, -1056, 76, 428, 552, -692,
	60, 356, 96, -384, -188, -612, -576, 736, 508, 892, 352,
	-1132, 504, -24, -352, 324, 332, -600, -312, 292, 508, -144,
	-8, 484, 48, 284, -260, -240, 256, -100, -292, -204, -44,
	472, -204, 908, -188, -1000, -256, 92, 1164, -392, 564, 356,
	652, -28, -884, 256, 484, -192, 760, -176, 376, -524, -452,
	-436, 860, -736, 212, 124, 504, -476, 468, 76, -472, 552,
	-692, -944, -620, 740, -240, 400, 132, 20, 192, -196, 264,
	-668, -1012, -60, 296, -316, -828, 76, -156, 284, -768, -448,
	-832, 148, 248, 652, 616, 1236, 288, -328, -400, -124, 588,
	220, 520, -696, 1032, 768, -740, -92, -272, 296, 448, -464,
	412, -200, 392, 440, -200, 264, -152, -260, 320, 1032, 216,
	320, -8, -64, 156, -1016, 1084, 1172, 536, 484, -432, 132,
	372, -52, -256, 84, 116, -352, 48, 116, 304, -384, 412,
	924, -300, 528, 628, 180, 648, 44, -980, -220, 1320, 48,
	332, 748, 524, -268, -720, 540, -276, 564, -344, -208, -196,
	436, 896, 88, -392, 132, 80, -964, -288, 568, 56, -48,
	-456, 888, 8, 552, -156, -292, 948, 288, 128, -716, -292,
	1192, -152, 876, 352, -600, -260, -812, -468, -28, -120, -32,
	-44, 1284, 496, 192, 464, 312, -76, -516, -380, -456, -1012,
	-48, 308, -156, 36, 492, -156, -808, 188, 1652, 68, -120,
	-116, 316, 160, -140, 352, 808, -416, 592, 316, -480, 56,
	528, -204, -568, 372, -232, 752, -344, 744, -4, 324, -416,
	-600, 768, 268, -248, -88, -132, -420, -432, 80, -288, 404,
	-316, -1216, -588, 520, -108, 92, -320, 368, -480, -216, -92,
	1688, -300, 180, 1020, -176, 820, -68, -228, -260, 436, -904,
	20, 40, -508, 440, -736, 312, 332, 204, 760, -372, 728,
	96, -20, -632, -520, -560, 336, 1076, -64, -532, 776, 584,
	192, 396, -728, -520, 276, -188, 80, -52, -612, -252, -48,
	648, 212, -688, 228, -52, -260, 428, -412, -272, -404, 180,
	816, -796, 48, 152, 484, -88, -216, 988, 696, 188, -528,
	648, -116, -180, 316, 476, 12, -564, 96, 476, -252, -364,
	-376, -392, 556, -256, -576, 260, -352, 120, -16, -136, -260,
	-492, 72, 556, 660, 580, 616, 772, 436, 424, -32, -324,
	-1268, 416, -324, -80, 920, 160, 228, 724, 32, -516, 64,
	384, 68, -128, 136, 240, 248, -204, -68, 252, -932, -120,
	-480, -628, -84, 192, 852, -404, -288, -132, 204, 100, 168,
	-68, -196, -868, 460, 1080, 380, -80, 244, 0, 484, -888,
	64, 184, 352, 600, 460, 164, 604, -196, 320, -64, 588,
	-184, 228, 12, 372, 48, -848, -344, 224, 208, -200, 484,
	128, -20, 272, -468, -840, 384, 256, -720, -520, -464, -580,
	112, -120, 644, -356, -208, -608, -528, 704, 560, -424, 392,
	828, 40, 84, 200, -152, 0, -144, 584, 280, -120, 80,
	-556, -972, -196, -472, 724, 80, 168, -32, 88, 160, -688,
	0, 160, 356, 372, -776, 740, -128, 676, -248, -480, 4,
	-364, 96, 544, 232, -1032, 956, 236, 356, 20, -40, 300,
	24, -676, -596, 132, 1120, -104, 532, -1096, 568, 648, 444,
	508, 380, 188, -376, -604, 1488, 424, 24, 756, -220, -192,
	716, 120, 920, 688, 168, 44, -460, 568, 284, 1144, 1160,
	600, 424, 888, 656, -356, -320, 220, 316, -176, -724, -188,
	-816, -628, -348, -228, -380, 1012, -452, -660, 736, 928, 404,
	-696, -72, -268, -892, 128, 184, -344, -780, 360, 336, 400,
	344, 428, 548, -112, 136, -228, -216, -820, -516, 340, 92,
	-136, 116, -300, 376, -244, 100, -316, -520, -284, -12, 824,
	164, -548, -180, -128, 116, -924, -828, 268, -368, -580, 620,
	192, 160, 0, -1676, 1068, 424, -56, -360, 468, -156, 720,
	288, -528, 556, -364, 548, -148, 504, 316, 152, -648, -620,
	-684, -24, -376, -384, -108, -920, -1032, 768, 180, -264, -508,
	-1268, -260, -60, 300, -240, 988, 724, -376, -576, -212, -736,
	556, 192, 1092, -620, -880, 376, -56, -4, -216, -32, 836,
	268, 396, 1332, 864, -600, 100, 56, -412, -92, 356, 180,
	884, -468, -436, 292, -388, -804, -704, -840, 368, -348, 140,
	-724, 1536, 940, 372, 112, -372, 436, -480, 1136, 296, -32,
	-228, 132, -48, -220, 868, -1016, -60, -1044, -464, 328, 916,
	244, 12, -736, -296, 360, 468, -376, -108, -92, 788, 368,
	-56, 544, 400, -672, -420, 728, 16, 320, 44, -284, -380,
	-796, 488, 132, 204, -596, -372, 88, -152, -908, -636, -572,
	-624, -116, -692, -200, -56, 276, -88, 484, -324, 948, 864,
	1000, -456, -184, -276, 292, -296, 156, 676, 320, 160, 908,
	-84, -1236, -288, -116, 260, -372, -644, 732, -756, -96, 84,
	344, -520, 348, -688, 240, -84, 216, -1044, -136, -676, -396,
	-1500, 960, -40, 176, 168, 1516, 420, -504, -344, -364, -360,
	1216, -940, -380, -212, 252, -660, -708, 484, -444, -152, 928,
	-120, 1112, 476, -260, 560, -148, -344, 108, -196, 228, -288,
	504, 560, -328, -88, 288, -1008, 460, -228, 468, -836, -196,
	76, 388, 232, 412, -1168, -716, -644, 756, -172, -356, -504,
	116, 432, 528, 48, 476, -168, -608, 448, 160, -532, -272,
	28, -676, -12, 828, 980, 456, 520, 104, -104, 256, -344,
	-4, -28, -368, -52, -524, -572, -556, -200, 768, 1124, -208,
	-512, 176, 232, 248, -148, -888, 604, -600, -304, 804, -156,
	-212, 488, -192, -804, -256, 368, -360, -916, -328, 228, -240,
	-448, -472, 856, -556, -364, 572, -12, -156, -368, -340, 432,
	252, -752, -152, 288, 268, -580, -848, -592, 108, -76, 244,
	312, -716, 592, -80, 436, 360, 4, -248, 160, 516, 584,
	732, 44, -468, -280, -292, -156, -588, 28, 308, 912, 24,
	124, 156, 180, -252, 944, -924, -772, -520, -428, -624, 300,
	-212, -1144, 32, -724, 800, -1128, -212, -1288, -848, 180, -416,
	440, 192, -576, -792, -76, -1080, 80, -532, -352, -132, 380,
	-820, 148, 1112, 128, 164, 456, 700, -924, 144, -668, -384,
	648, -832, 508, 552, -52, -100, -656, 208, -568, 748, -88,
	680, 232, 300, 192, -408, -1012, -152, -252, -268, 272, -876,
	-664, -648, -332, -136, 16, 12, 1152, -28, 332, -536, 320,
	-672, -460, -316, 532, -260, 228, -40, 1052, -816, 180, 88,
	-496, -556, -672, -368, 428, 92, 356, 404, -408, 252, 196,
	-176, -556, 792, 268, 32, 372, 40, 96, -332, 328, 120,
	372, -900, -40, 472, -264, -592, 952, 128, 656, 112, 664,
	-232, 420, 4, -344, -464, 556, 244, -416, -32, 252, 0,
	-412, 188, -696, 508, -476, 324, -1096, 656, -312, 560, 264,
	-136, 304, 160, -64, -580, 248, 336, -720, 560, -348, -288,
	-276, -196, -500, 852, -544, -236, -1128, -992, -776, 116, 56,
	52, 860, 884, 212, -12, 168, 1020, 512, -552, 924, -148,
	716, 188, 164, -340, -520, -184, 880, -152, -680, -208, -1156,
	-300, -528, -472, 364, 100, -744, -1056, -32, 540, 280, 144,
	-676, -32, -232, -280, -224, 96, 568, -76, 172, 148, 148,
	104, 32, -296, -32, 788, -80, 32, -16, 280, 288, 944,
	428, -484
};

static inline s32 clamp(s32 value, s32 low, s32 high)
{
	return value < low ? low : (value > high ? high : value);
}

static inline s32 round_power_of_two(const s32 val, s32 n)
{
	const s32 a = (s32)1 << (n - 1);

	return (val + a) >> n;
}

static void rockchip_av1_init_random_generator(u8 luma_num, u16 seed,
					       u16 *random_register)
{
	u16 random_reg = seed;

	random_reg ^= ((luma_num * 37 + 178) & 255) << 8;
	random_reg ^= ((luma_num * 173 + 105) & 255);
	*random_register = random_reg;
}

static inline void rockchip_av1_update_random_register(u16 *random_register)
{
	u16 bit;
	u16 random_reg = *random_register;

	bit = ((random_reg >> 0) ^ (random_reg >> 1) ^ (random_reg >> 3) ^
	       (random_reg >> 12)) & 1;
	*random_register = (random_reg >> 1) | (bit << 15);
}

static inline s32 rockchip_av1_get_random_number(u16 random_register)
{
	return (random_register >> 5) & ((1 << 11) - 1);
}

void rockchip_av1_generate_luma_grain_block(s32 (*luma_grain_block)[73][82],
					    s32 bitdepth,
					    u8 num_y_points,
					    s32 grain_scale_shift,
					    s32 ar_coeff_lag,
					    s32 (*ar_coeffs_y)[24],
					    s32 ar_coeff_shift,
					    s32 grain_min,
					    s32 grain_max,
					    u16 random_seed)
{
	s32 gauss_sec_shift = 12 - bitdepth + grain_scale_shift;
	u16 grain_random_register = random_seed;
	s32 i, j;

	for (i = 0; i < 73; i++) {
		for (j = 0; j < 82; j++) {
			if (num_y_points > 0) {
				rockchip_av1_update_random_register
				    (&grain_random_register);
				(*luma_grain_block)[i][j] =
				    round_power_of_two(gaussian_sequence
					     [rockchip_av1_get_random_number
					      (grain_random_register)],
					     gauss_sec_shift);
			} else {
				(*luma_grain_block)[i][j] = 0;
			}
		}
	}

	for (i = 3; i < 73; i++)
		for (j = 3; j < 82 - 3; j++) {
			s32 pos = 0;
			s32 wsum = 0;
			s32 deltarow, deltacol;

			for (deltarow = -ar_coeff_lag; deltarow <= 0;
			     deltarow++) {
				for (deltacol = -ar_coeff_lag;
				     deltacol <= ar_coeff_lag; deltacol++) {
					if (deltarow == 0 && deltacol == 0)
						break;
					wsum = wsum + (*ar_coeffs_y)[pos] *
					    (*luma_grain_block)[i + deltarow][j + deltacol];
					++pos;
				}
			}
			(*luma_grain_block)[i][j] =
				clamp((*luma_grain_block)[i][j] +
				      round_power_of_two(wsum, ar_coeff_shift),
				      grain_min, grain_max);
		}
}

// Calculate chroma grain noise once per frame
void rockchip_av1_generate_chroma_grain_block(s32 (*luma_grain_block)[73][82],
					      s32 (*cb_grain_block)[38][44],
					      s32 (*cr_grain_block)[38][44],
					      s32 bitdepth,
					      u8 num_y_points,
					      u8 num_cb_points,
					      u8 num_cr_points,
					      s32 grain_scale_shift,
					      s32 ar_coeff_lag,
					      s32 (*ar_coeffs_cb)[25],
					      s32 (*ar_coeffs_cr)[25],
					      s32 ar_coeff_shift,
					      s32 grain_min,
					      s32 grain_max,
					      u8 chroma_scaling_from_luma,
					      u16 random_seed)
{
	s32 gauss_sec_shift = 12 - bitdepth + grain_scale_shift;
	u16 grain_random_register = 0;
	s32 i, j;

	rockchip_av1_init_random_generator(7, random_seed,
					   &grain_random_register);
	for (i = 0; i < 38; i++) {
		for (j = 0; j < 44; j++) {
			if (num_cb_points || chroma_scaling_from_luma) {
				rockchip_av1_update_random_register
				    (&grain_random_register);
				(*cb_grain_block)[i][j] =
				    round_power_of_two(gaussian_sequence
					     [rockchip_av1_get_random_number
					      (grain_random_register)],
					     gauss_sec_shift);
			} else {
				(*cb_grain_block)[i][j] = 0;
			}
		}
	}

	rockchip_av1_init_random_generator(11, random_seed,
					   &grain_random_register);
	for (i = 0; i < 38; i++) {
		for (j = 0; j < 44; j++) {
			if (num_cr_points || chroma_scaling_from_luma) {
				rockchip_av1_update_random_register
				    (&grain_random_register);
				(*cr_grain_block)[i][j] =
				    round_power_of_two(gaussian_sequence
					     [rockchip_av1_get_random_number
					      (grain_random_register)],
					     gauss_sec_shift);
			} else {
				(*cr_grain_block)[i][j] = 0;
			}
		}
	}

	for (i = 3; i < 38; i++) {
		for (j = 3; j < 44 - 3; j++) {
			s32 wsum_cb = 0;
			s32 wsum_cr = 0;
			s32 pos = 0;
			s32 deltarow, deltacol;

			for (deltarow = -ar_coeff_lag; deltarow <= 0;
			     deltarow++) {
				for (deltacol = -ar_coeff_lag;
				     deltacol <= ar_coeff_lag; deltacol++) {
					if (deltarow == 0 && deltacol == 0)
						break;
					wsum_cb = wsum_cb + (*ar_coeffs_cb)[pos] *
					    (*cb_grain_block)[i + deltarow][j + deltacol];
					wsum_cr =
					    wsum_cr +
					    (*ar_coeffs_cr)[pos] *
					    (*cr_grain_block)[i + deltarow][j + deltacol];
					++pos;
				}
			}

			if (num_y_points > 0) {
				s32 av_luma = 0;
				s32 luma_coord_y = (i << 1) - 3;
				s32 luma_coord_x = (j << 1) - 3;

				av_luma +=
				    (*luma_grain_block)[luma_coord_y][luma_coord_x];
				av_luma +=
				    (*luma_grain_block)[luma_coord_y][luma_coord_x + 1];
				av_luma +=
				    (*luma_grain_block)[luma_coord_y + 1][luma_coord_x];
				av_luma +=
				    (*luma_grain_block)[(luma_coord_y + 1)][luma_coord_x + 1];
				av_luma = round_power_of_two(av_luma, 2);

				wsum_cb = wsum_cb + (*ar_coeffs_cb)[pos] * av_luma;
				wsum_cr = wsum_cr + (*ar_coeffs_cr)[pos] * av_luma;
			}

			if (num_cb_points || chroma_scaling_from_luma) {
				(*cb_grain_block)[i][j] =
				    clamp((*cb_grain_block)[i][j] +
					  round_power_of_two(wsum_cb, ar_coeff_shift),
					  grain_min, grain_max);
			}
			if (num_cr_points || chroma_scaling_from_luma) {
				(*cr_grain_block)[i][j] =
				    clamp((*cr_grain_block)[i][j] +
					  round_power_of_two(wsum_cr, ar_coeff_shift),
					  grain_min, grain_max);
			}
		}
	}
}