/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * RemoteFX Codec Library - SSE2 Optimizations

 *

 * Copyright 2011 Stephen Erisman

 * Copyright 2011 Norbert Federa <norbert.federa@thincast.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <winpr/sysinfo.h>

#include <xmmintrin.h>

#include <emmintrin.h>

#include "rfx_types.h"

#include "rfx_sse2.h"

#ifdef _MSC_VER

#define __attribute__(...)

#endif

#define CACHE_LINE_BYTES 64

#ifndef __clang__

#define ATTRIBUTES __gnu_inline__, __always_inline__, __artificial__

#else

#define ATTRIBUTES __gnu_inline__, __always_inline__

#endif

#define _mm_between_epi16(_val, _min, _max)                    \

	do                                                         \

	{                                                          \

		_val = _mm_min_epi16(_max, _mm_max_epi16(_val, _min)); \

	} while (0)

static __inline void __attribute__((ATTRIBUTES)) _mm_prefetch_buffer(char* buffer, int num_bytes)

{

	__m128i* buf = (__m128i*)buffer;

	unsigned int i;

	for (i = 0; i < (num_bytes / sizeof(__m128i)); i += (CACHE_LINE_BYTES / sizeof(__m128i)))

	{

		_mm_prefetch((char*)(&buf[i]), _MM_HINT_NTA);

	}

}

/* rfx_decode_ycbcr_to_rgb_sse2 code now resides in the primitives library. */

/* rfx_encode_rgb_to_ycbcr_sse2 code now resides in the primitives library. */

static __inline void __attribute__((ATTRIBUTES))

rfx_quantization_decode_block_sse2(INT16* buffer, const int buffer_size, const UINT32 factor)

{

	__m128i a;

	__m128i* ptr = (__m128i*)buffer;

	__m128i* buf_end = (__m128i*)(buffer + buffer_size);

	if (factor == 0)

		return;

	do

	{

		a = _mm_load_si128(ptr);

		a = _mm_slli_epi16(a, factor);

		_mm_store_si128(ptr, a);

		ptr++;

	} while (ptr < buf_end);

}

static void rfx_quantization_decode_sse2(INT16* buffer, const UINT32* quantVals)

{

	_mm_prefetch_buffer((char*)buffer, 4096 * sizeof(INT16));

	rfx_quantization_decode_block_sse2(&buffer[0], 1024, quantVals[8] - 1);    /* HL1 */

	rfx_quantization_decode_block_sse2(&buffer[1024], 1024, quantVals[7] - 1); /* LH1 */

	rfx_quantization_decode_block_sse2(&buffer[2048], 1024, quantVals[9] - 1); /* HH1 */

	rfx_quantization_decode_block_sse2(&buffer[3072], 256, quantVals[5] - 1);  /* HL2 */

	rfx_quantization_decode_block_sse2(&buffer[3328], 256, quantVals[4] - 1);  /* LH2 */

	rfx_quantization_decode_block_sse2(&buffer[3584], 256, quantVals[6] - 1);  /* HH2 */

	rfx_quantization_decode_block_sse2(&buffer[3840], 64, quantVals[2] - 1);   /* HL3 */

	rfx_quantization_decode_block_sse2(&buffer[3904], 64, quantVals[1] - 1);   /* LH3 */

	rfx_quantization_decode_block_sse2(&buffer[3968], 64, quantVals[3] - 1);   /* HH3 */

	rfx_quantization_decode_block_sse2(&buffer[4032], 64, quantVals[0] - 1);   /* LL3 */

}

static __inline void __attribute__((ATTRIBUTES))

rfx_quantization_encode_block_sse2(INT16* buffer, const int buffer_size, const UINT32 factor)

{

	__m128i a;

	__m128i* ptr = (__m128i*)buffer;

	__m128i* buf_end = (__m128i*)(buffer + buffer_size);

	__m128i half;

	if (factor == 0)

		return;

	half = _mm_set1_epi16(1 << (factor - 1));

	do

	{

		a = _mm_load_si128(ptr);

		a = _mm_add_epi16(a, half);

		a = _mm_srai_epi16(a, factor);

		_mm_store_si128(ptr, a);

		ptr++;

	} while (ptr < buf_end);

}

static void rfx_quantization_encode_sse2(INT16* buffer, const UINT32* quantization_values)

{

	_mm_prefetch_buffer((char*)buffer, 4096 * sizeof(INT16));

	rfx_quantization_encode_block_sse2(buffer, 1024, quantization_values[8] - 6);        /* HL1 */

	rfx_quantization_encode_block_sse2(buffer + 1024, 1024, quantization_values[7] - 6); /* LH1 */

	rfx_quantization_encode_block_sse2(buffer + 2048, 1024, quantization_values[9] - 6); /* HH1 */

	rfx_quantization_encode_block_sse2(buffer + 3072, 256, quantization_values[5] - 6);  /* HL2 */

	rfx_quantization_encode_block_sse2(buffer + 3328, 256, quantization_values[4] - 6);  /* LH2 */

	rfx_quantization_encode_block_sse2(buffer + 3584, 256, quantization_values[6] - 6);  /* HH2 */

	rfx_quantization_encode_block_sse2(buffer + 3840, 64, quantization_values[2] - 6);   /* HL3 */

	rfx_quantization_encode_block_sse2(buffer + 3904, 64, quantization_values[1] - 6);   /* LH3 */

	rfx_quantization_encode_block_sse2(buffer + 3968, 64, quantization_values[3] - 6);   /* HH3 */

	rfx_quantization_encode_block_sse2(buffer + 4032, 64, quantization_values[0] - 6);   /* LL3 */

	rfx_quantization_encode_block_sse2(buffer, 4096, 5);

}

static __inline void __attribute__((ATTRIBUTES))

rfx_dwt_2d_decode_block_horiz_sse2(INT16* l, INT16* h, INT16* dst, int subband_width)

{

	int y, n;

	INT16* l_ptr = l;

	INT16* h_ptr = h;

	INT16* dst_ptr = dst;

	int first;

	int last;

	__m128i l_n;

	__m128i h_n;

	__m128i h_n_m;

	__m128i tmp_n;

	__m128i dst_n;

	__m128i dst_n_p;

	__m128i dst1;

	__m128i dst2;

	for (y = 0; y < subband_width; y++)

	{

		/* Even coefficients */

		for (n = 0; n < subband_width; n += 8)

		{

			/* dst[2n] = l[n] - ((h[n-1] + h[n] + 1) >> 1); */

			l_n = _mm_load_si128((__m128i*)l_ptr);

			h_n = _mm_load_si128((__m128i*)h_ptr);

			h_n_m = _mm_loadu_si128((__m128i*)(h_ptr - 1));

			if (n == 0)

			{

				first = _mm_extract_epi16(h_n_m, 1);

				h_n_m = _mm_insert_epi16(h_n_m, first, 0);

			}

			tmp_n = _mm_add_epi16(h_n, h_n_m);

			tmp_n = _mm_add_epi16(tmp_n, _mm_set1_epi16(1));

			tmp_n = _mm_srai_epi16(tmp_n, 1);

			dst_n = _mm_sub_epi16(l_n, tmp_n);

			_mm_store_si128((__m128i*)l_ptr, dst_n);

			l_ptr += 8;

			h_ptr += 8;

		}

		l_ptr -= subband_width;

		h_ptr -= subband_width;

		/* Odd coefficients */

		for (n = 0; n < subband_width; n += 8)

		{

			/* dst[2n + 1] = (h[n] << 1) + ((dst[2n] + dst[2n + 2]) >> 1); */

			h_n = _mm_load_si128((__m128i*)h_ptr);

			h_n = _mm_slli_epi16(h_n, 1);

			dst_n = _mm_load_si128((__m128i*)(l_ptr));

			dst_n_p = _mm_loadu_si128((__m128i*)(l_ptr + 1));

			if (n == subband_width - 8)

			{

				last = _mm_extract_epi16(dst_n_p, 6);

				dst_n_p = _mm_insert_epi16(dst_n_p, last, 7);

			}

			tmp_n = _mm_add_epi16(dst_n_p, dst_n);

			tmp_n = _mm_srai_epi16(tmp_n, 1);

			tmp_n = _mm_add_epi16(tmp_n, h_n);

			dst1 = _mm_unpacklo_epi16(dst_n, tmp_n);

			dst2 = _mm_unpackhi_epi16(dst_n, tmp_n);

			_mm_store_si128((__m128i*)dst_ptr, dst1);

			_mm_store_si128((__m128i*)(dst_ptr + 8), dst2);

			l_ptr += 8;

			h_ptr += 8;

			dst_ptr += 16;

		}

	}

}

static __inline void __attribute__((ATTRIBUTES))

rfx_dwt_2d_decode_block_vert_sse2(INT16* l, INT16* h, INT16* dst, int subband_width)

{

	int x, n;

	INT16* l_ptr = l;

	INT16* h_ptr = h;

	INT16* dst_ptr = dst;

	__m128i l_n;

	__m128i h_n;

	__m128i tmp_n;

	__m128i h_n_m;

	__m128i dst_n;

	__m128i dst_n_m;

	__m128i dst_n_p;

	int total_width = subband_width + subband_width;

	/* Even coefficients */

	for (n = 0; n < subband_width; n++)

	{

		for (x = 0; x < total_width; x += 8)

		{

			/* dst[2n] = l[n] - ((h[n-1] + h[n] + 1) >> 1); */

			l_n = _mm_load_si128((__m128i*)l_ptr);

			h_n = _mm_load_si128((__m128i*)h_ptr);

			tmp_n = _mm_add_epi16(h_n, _mm_set1_epi16(1));

			if (n == 0)

				tmp_n = _mm_add_epi16(tmp_n, h_n);

			else

			{

				h_n_m = _mm_loadu_si128((__m128i*)(h_ptr - total_width));

				tmp_n = _mm_add_epi16(tmp_n, h_n_m);

			}

			tmp_n = _mm_srai_epi16(tmp_n, 1);

			dst_n = _mm_sub_epi16(l_n, tmp_n);

			_mm_store_si128((__m128i*)dst_ptr, dst_n);

			l_ptr += 8;

			h_ptr += 8;

			dst_ptr += 8;

		}

		dst_ptr += total_width;

	}

	h_ptr = h;

	dst_ptr = dst + total_width;

	/* Odd coefficients */

	for (n = 0; n < subband_width; n++)

	{

		for (x = 0; x < total_width; x += 8)

		{

			/* dst[2n + 1] = (h[n] << 1) + ((dst[2n] + dst[2n + 2]) >> 1); */

			h_n = _mm_load_si128((__m128i*)h_ptr);

			dst_n_m = _mm_load_si128((__m128i*)(dst_ptr - total_width));

			h_n = _mm_slli_epi16(h_n, 1);

			tmp_n = dst_n_m;

			if (n == subband_width - 1)

				tmp_n = _mm_add_epi16(tmp_n, dst_n_m);

			else

			{

				dst_n_p = _mm_loadu_si128((__m128i*)(dst_ptr + total_width));

				tmp_n = _mm_add_epi16(tmp_n, dst_n_p);

			}

			tmp_n = _mm_srai_epi16(tmp_n, 1);

			dst_n = _mm_add_epi16(tmp_n, h_n);

			_mm_store_si128((__m128i*)dst_ptr, dst_n);

			h_ptr += 8;

			dst_ptr += 8;

		}

		dst_ptr += total_width;

	}

}

static __inline void __attribute__((ATTRIBUTES))

rfx_dwt_2d_decode_block_sse2(INT16* buffer, INT16* idwt, int subband_width)

{

	INT16 *hl, *lh, *hh, *ll;

	INT16 *l_dst, *h_dst;

	_mm_prefetch_buffer((char*)idwt, subband_width * 4 * sizeof(INT16));

	/* Inverse DWT in horizontal direction, results in 2 sub-bands in L, H order in tmp buffer idwt.

	 */

	/* The 4 sub-bands are stored in HL(0), LH(1), HH(2), LL(3) order. */

	/* The lower part L uses LL(3) and HL(0). */

	/* The higher part H uses LH(1) and HH(2). */

	ll = buffer + subband_width * subband_width * 3;

	hl = buffer;

	l_dst = idwt;

	rfx_dwt_2d_decode_block_horiz_sse2(ll, hl, l_dst, subband_width);

	lh = buffer + subband_width * subband_width;

	hh = buffer + subband_width * subband_width * 2;

	h_dst = idwt + subband_width * subband_width * 2;

	rfx_dwt_2d_decode_block_horiz_sse2(lh, hh, h_dst, subband_width);

	/* Inverse DWT in vertical direction, results are stored in original buffer. */

	rfx_dwt_2d_decode_block_vert_sse2(l_dst, h_dst, buffer, subband_width);

}

static void rfx_dwt_2d_decode_sse2(INT16* buffer, INT16* dwt_buffer)

{

	_mm_prefetch_buffer((char*)buffer, 4096 * sizeof(INT16));

	rfx_dwt_2d_decode_block_sse2(&buffer[3840], dwt_buffer, 8);

	rfx_dwt_2d_decode_block_sse2(&buffer[3072], dwt_buffer, 16);

	rfx_dwt_2d_decode_block_sse2(&buffer[0], dwt_buffer, 32);

}

static __inline void __attribute__((ATTRIBUTES))

rfx_dwt_2d_encode_block_vert_sse2(INT16* src, INT16* l, INT16* h, int subband_width)

{

	int total_width;

	int x;

	int n;

	__m128i src_2n;

	__m128i src_2n_1;

	__m128i src_2n_2;

	__m128i h_n;

	__m128i h_n_m;

	__m128i l_n;

	total_width = subband_width << 1;

	for (n = 0; n < subband_width; n++)

	{

		for (x = 0; x < total_width; x += 8)

		{

			src_2n = _mm_load_si128((__m128i*)src);

			src_2n_1 = _mm_load_si128((__m128i*)(src + total_width));

			if (n < subband_width - 1)

				src_2n_2 = _mm_load_si128((__m128i*)(src + 2 * total_width));

			else

				src_2n_2 = src_2n;

			/* h[n] = (src[2n + 1] - ((src[2n] + src[2n + 2]) >> 1)) >> 1 */

			h_n = _mm_add_epi16(src_2n, src_2n_2);

			h_n = _mm_srai_epi16(h_n, 1);

			h_n = _mm_sub_epi16(src_2n_1, h_n);

			h_n = _mm_srai_epi16(h_n, 1);

			_mm_store_si128((__m128i*)h, h_n);

			if (n == 0)

				h_n_m = h_n;

			else

				h_n_m = _mm_load_si128((__m128i*)(h - total_width));

			/* l[n] = src[2n] + ((h[n - 1] + h[n]) >> 1) */

			l_n = _mm_add_epi16(h_n_m, h_n);

			l_n = _mm_srai_epi16(l_n, 1);

			l_n = _mm_add_epi16(l_n, src_2n);

			_mm_store_si128((__m128i*)l, l_n);

			src += 8;

			l += 8;

			h += 8;

		}

		src += total_width;

	}

}

static __inline void __attribute__((ATTRIBUTES))

rfx_dwt_2d_encode_block_horiz_sse2(INT16* src, INT16* l, INT16* h, int subband_width)

{

	int y;

	int n;

	int first;

	__m128i src_2n;

	__m128i src_2n_1;

	__m128i src_2n_2;

	__m128i h_n;

	__m128i h_n_m;

	__m128i l_n;

	for (y = 0; y < subband_width; y++)

	{

		for (n = 0; n < subband_width; n += 8)

		{

			/* The following 3 Set operations consumes more than half of the total DWT processing

			 * time! */

			src_2n =

			    _mm_set_epi16(src[14], src[12], src[10], src[8], src[6], src[4], src[2], src[0]);

			src_2n_1 =

			    _mm_set_epi16(src[15], src[13], src[11], src[9], src[7], src[5], src[3], src[1]);

			src_2n_2 = _mm_set_epi16(n == subband_width - 8 ? src[14] : src[16], src[14], src[12],

			                         src[10], src[8], src[6], src[4], src[2]);

			/* h[n] = (src[2n + 1] - ((src[2n] + src[2n + 2]) >> 1)) >> 1 */

			h_n = _mm_add_epi16(src_2n, src_2n_2);

			h_n = _mm_srai_epi16(h_n, 1);

			h_n = _mm_sub_epi16(src_2n_1, h_n);

			h_n = _mm_srai_epi16(h_n, 1);

			_mm_store_si128((__m128i*)h, h_n);

			h_n_m = _mm_loadu_si128((__m128i*)(h - 1));

			if (n == 0)

			{

				first = _mm_extract_epi16(h_n_m, 1);

				h_n_m = _mm_insert_epi16(h_n_m, first, 0);

			}

			/* l[n] = src[2n] + ((h[n - 1] + h[n]) >> 1) */

			l_n = _mm_add_epi16(h_n_m, h_n);

			l_n = _mm_srai_epi16(l_n, 1);

			l_n = _mm_add_epi16(l_n, src_2n);

			_mm_store_si128((__m128i*)l, l_n);

			src += 16;

			l += 8;

			h += 8;

		}

	}

}

static __inline void __attribute__((ATTRIBUTES))

rfx_dwt_2d_encode_block_sse2(INT16* buffer, INT16* dwt, int subband_width)

{

	INT16 *hl, *lh, *hh, *ll;

	INT16 *l_src, *h_src;

	_mm_prefetch_buffer((char*)dwt, subband_width * 4 * sizeof(INT16));

	/* DWT in vertical direction, results in 2 sub-bands in L, H order in tmp buffer dwt. */

	l_src = dwt;

	h_src = dwt + subband_width * subband_width * 2;

	rfx_dwt_2d_encode_block_vert_sse2(buffer, l_src, h_src, subband_width);

	/* DWT in horizontal direction, results in 4 sub-bands in HL(0), LH(1), HH(2), LL(3) order,

	 * stored in original buffer. */

	/* The lower part L generates LL(3) and HL(0). */

	/* The higher part H generates LH(1) and HH(2). */

	ll = buffer + subband_width * subband_width * 3;

	hl = buffer;

	lh = buffer + subband_width * subband_width;

	hh = buffer + subband_width * subband_width * 2;

	rfx_dwt_2d_encode_block_horiz_sse2(l_src, ll, hl, subband_width);

	rfx_dwt_2d_encode_block_horiz_sse2(h_src, lh, hh, subband_width);

}

static void rfx_dwt_2d_encode_sse2(INT16* buffer, INT16* dwt_buffer)

{

	_mm_prefetch_buffer((char*)buffer, 4096 * sizeof(INT16));

	rfx_dwt_2d_encode_block_sse2(buffer, dwt_buffer, 32);

	rfx_dwt_2d_encode_block_sse2(buffer + 3072, dwt_buffer, 16);

	rfx_dwt_2d_encode_block_sse2(buffer + 3840, dwt_buffer, 8);

}

void rfx_init_sse2(RFX_CONTEXT* context)

{

	if (!IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))

		return;

	PROFILER_RENAME(context->priv->prof_rfx_quantization_decode, "rfx_quantization_decode_sse2");

	PROFILER_RENAME(context->priv->prof_rfx_quantization_encode, "rfx_quantization_encode_sse2");

	PROFILER_RENAME(context->priv->prof_rfx_dwt_2d_decode, "rfx_dwt_2d_decode_sse2");

	PROFILER_RENAME(context->priv->prof_rfx_dwt_2d_encode, "rfx_dwt_2d_encode_sse2");

	context->quantization_decode = rfx_quantization_decode_sse2;

	context->quantization_encode = rfx_quantization_encode_sse2;

	context->dwt_2d_decode = rfx_dwt_2d_decode_sse2;

	context->dwt_2d_encode = rfx_dwt_2d_encode_sse2;

}