/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file 32bpp_sse4_anim.cpp Implementation of the SSE4 32 bpp blitter with animation support. */

#ifdef WITH_SSE

#include "../stdafx.h"
#include "../video/video_driver.hpp"
#include "../table/sprites.h"
#include "32bpp_anim_sse4.hpp"

/** Instantiation of the SSE4 32bpp blitter factory. */
static FBlitter_32bppSSE4_Anim iFBlitter_32bppSSE4_Anim;

/**
 * Draws a sprite to a (screen) buffer. It is templated to allow faster operation.
 *
 * @tparam mode blitter mode
 * @param bp further blitting parameters
 * @param zoom zoom level at which we are drawing
 */
IGNORE_UNINITIALIZED_WARNING_START
template <BlitterMode mode, Blitter_32bppSSE2::ReadMode read_mode, Blitter_32bppSSE2::BlockType bt_last>
inline void Blitter_32bppSSE4_Anim::Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom)
{
	const byte * const remap = bp->remap;
	Colour *dst_line = (Colour *) bp->dst + bp->top * bp->pitch + bp->left;
	uint16 *anim_line = this->anim_buf + ((uint32 *)bp->dst - (uint32 *)_screen.dst_ptr) + bp->top * this->anim_buf_width + bp->left;
	int effective_width = bp->width;

	/* Find where to start reading in the source sprite. */
	const Blitter_32bppSSE_Base::SpriteData * const sd = (const Blitter_32bppSSE_Base::SpriteData *) bp->sprite;
	const SpriteInfo * const si = &sd->infos[zoom];
	const MapValue *src_mv_line = (const MapValue *) &sd->data[si->mv_offset] + bp->skip_top * si->sprite_width;
	const Colour *src_rgba_line = (const Colour *) ((const byte *) &sd->data[si->sprite_offset] + bp->skip_top * si->sprite_line_size);

	if (read_mode != RM_WITH_MARGIN) {
		src_rgba_line += bp->skip_left;
		src_mv_line += bp->skip_left;
	}
	const MapValue *src_mv = src_mv_line;

	/* Load these variables into register before loop. */
	const __m128i a_cm        = ALPHA_CONTROL_MASK;
	const __m128i pack_low_cm = PACK_LOW_CONTROL_MASK;
	const __m128i tr_nom_base = TRANSPARENT_NOM_BASE;

	for (int y = bp->height; y != 0; y--) {
		Colour *dst = dst_line;
		const Colour *src = src_rgba_line + META_LENGTH;
		if (mode != BM_TRANSPARENT) src_mv = src_mv_line;
		uint16 *anim = anim_line;

		if (read_mode == RM_WITH_MARGIN) {
			assert(bt_last == BT_NONE); // or you must ensure block type is preserved
			anim += src_rgba_line[0].data;
			src += src_rgba_line[0].data;
			dst += src_rgba_line[0].data;
			if (mode != BM_TRANSPARENT) src_mv += src_rgba_line[0].data;
			const int width_diff = si->sprite_width - bp->width;
			effective_width = bp->width - (int) src_rgba_line[0].data;
			const int delta_diff = (int) src_rgba_line[1].data - width_diff;
			const int new_width = effective_width - delta_diff;
			effective_width = delta_diff > 0 ? new_width : effective_width;
			if (effective_width <= 0) goto next_line;
		}

		switch (mode) {
			default:
				for (uint x = (uint) effective_width/2; x != 0; x--) {
					uint32 mvX2 = *((uint32 *) const_cast<MapValue *>(src_mv));
					__m128i srcABCD = _mm_loadl_epi64((const __m128i*) src);
					__m128i dstABCD = _mm_loadl_epi64((__m128i*) dst);

					/* Remap colours. */
					const byte m0 = mvX2;
					if (m0 >= PALETTE_ANIM_START) {
						const Colour c0 = (this->LookupColourInPalette(m0).data & 0x00FFFFFF) | (src[0].data & 0xFF000000);
						INSR32(AdjustBrightness(c0, (byte) (mvX2 >> 8)).data, srcABCD, 0);
					}
					const byte m1 = mvX2 >> 16;
					if (m1 >= PALETTE_ANIM_START) {
						const Colour c1 = (this->LookupColourInPalette(m1).data & 0x00FFFFFF) | (src[1].data & 0xFF000000);
						INSR32(AdjustBrightness(c1, (byte) (mvX2 >> 24)).data, srcABCD, 1);
					}

					/* Update anim buffer. */
					const byte a0 = src[0].a;
					const byte a1 = src[1].a;
					uint32 anim01 = 0;
					if (a0 == 255) {
						if (a1 == 255) {
							*(uint32*) anim = mvX2;
							goto bmno_full_opacity;
						}
						anim01 = (uint16) mvX2;
					} else if (a0 == 0) {
						if (a1 == 0) {
							goto bmno_full_transparency;
						} else {
							if (a1 == 255) anim[1] = (uint16) (mvX2 >> 16);
							goto bmno_alpha_blend;
						}
					}
					if (a1 > 0) {
						if (a1 == 255) anim01 |= mvX2 & 0xFFFF0000;
						*(uint32*) anim = anim01;
					} else {
						anim[0] = (uint16) anim01;
					}

					/* Blend colours. */
bmno_alpha_blend:
					ALPHA_BLEND_2();
bmno_full_opacity:
					_mm_storel_epi64((__m128i *) dst, srcABCD);
bmno_full_transparency:
					src_mv += 2;
					src += 2;
					anim += 2;
					dst += 2;
				}

				if ((bt_last == BT_NONE && effective_width & 1) || bt_last == BT_ODD) {
					if (src->a == 0) {
					} else if (src->a == 255) {
						*anim = *(const uint16*) src_mv;
						*dst = (src_mv->m >= PALETTE_ANIM_START) ? AdjustBrightness(LookupColourInPalette(src_mv->m), src_mv->v) : *src;
					} else {
						*anim = 0;
						__m128i srcABCD;
						__m128i dstABCD = _mm_cvtsi32_si128(dst->data);
						if (src_mv->m >= PALETTE_ANIM_START) {
							Colour colour = AdjustBrightness(LookupColourInPalette(src_mv->m), src_mv->v);
							colour.a = src->a;
							srcABCD = _mm_cvtsi32_si128(colour.data);
						} else {
							srcABCD = _mm_cvtsi32_si128(src->data);
						}
						ALPHA_BLEND_2();
						dst->data = _mm_cvtsi128_si32(srcABCD);
					}
				}
				break;

			case BM_COLOUR_REMAP:
				for (uint x = (uint) effective_width / 2; x != 0; x--) {
					uint32 mvX2 = *((uint32 *) const_cast<MapValue *>(src_mv));
					__m128i srcABCD = _mm_loadl_epi64((const __m128i*) src);
					__m128i dstABCD = _mm_loadl_epi64((__m128i*) dst);

					/* Remap colours. */
					const uint m0 = (byte) mvX2;
					const uint r0 = remap[m0];
					const uint m1 = (byte) (mvX2 >> 16);
					const uint r1 = remap[m1];
					if (mvX2 & 0x00FF00FF) {
						/* Written so the compiler uses CMOV. */
						const Colour src0 = src[0];
						const Colour c0map = (this->LookupColourInPalette(r0).data & 0x00FFFFFF) | (src0.data & 0xFF000000);
						Colour c0 = dst[0];
						c0 = r0 == 0 ? c0 : c0map;
						c0 = m0 != 0 ? c0 : src0;
						srcABCD = _mm_cvtsi32_si128(c0.data);

						const Colour src1 = src[1];
						const Colour c1map = (this->LookupColourInPalette(r1).data & 0x00FFFFFF) | (src1.data & 0xFF000000);
						Colour c1 = dst[1];
						c1 = r1 == 0 ? c1 : c1map;
						c1 = m1 != 0 ? c1 : src1;
						INSR32(c1.data, srcABCD, 1);

						if ((mvX2 & 0xFF00FF00) != 0x80008000) {
							ADJUST_BRIGHTNESS_2(srcABCD, mvX2);
						}
					}

					/* Update anim buffer. */
					const byte a0 = src[0].a;
					const byte a1 = src[1].a;
					uint32 anim01 = mvX2 & 0xFF00FF00;
					if (a0 == 255) {
						anim01 |= r0;
						if (a1 == 255) {
							*(uint32*) anim = anim01 | (r1 << 16);
							goto bmcr_full_opacity;
						}
					} else if (a0 == 0) {
						if (a1 == 0) {
							goto bmcr_full_transparency;
						} else {
							if (a1 == 255) {
								anim[1] = r1 | (anim01 >> 16);
							}
							goto bmcr_alpha_blend;
						}
					}
					if (a1 > 0) {
						if (a1 == 255) anim01 |= r1 << 16;
						*(uint32*) anim = anim01;
					} else {
						anim[0] = (uint16) anim01;
					}

					/* Blend colours. */
bmcr_alpha_blend:
					ALPHA_BLEND_2();
bmcr_full_opacity:
					_mm_storel_epi64((__m128i *) dst, srcABCD);
bmcr_full_transparency:
					src_mv += 2;
					dst += 2;
					src += 2;
					anim += 2;
				}

				if ((bt_last == BT_NONE && effective_width & 1) || bt_last == BT_ODD) {
					/* In case the m-channel is zero, do not remap this pixel in any way. */
					__m128i srcABCD;
					if (src->a == 0) break;
					if (src_mv->m) {
						const uint r = remap[src_mv->m];
						*anim = (src->a == 255) ? r | ((uint16) src_mv->v << 8 ) : 0;
						if (r != 0) {
							Colour remapped_colour = AdjustBrightness(this->LookupColourInPalette(r), src_mv->v);
							if (src->a == 255) {
								*dst = remapped_colour;
							} else {
								remapped_colour.a = src->a;
								srcABCD = _mm_cvtsi32_si128(remapped_colour.data);
								goto bmcr_alpha_blend_single;
							}
						}
					} else {
						*anim = 0;
						srcABCD = _mm_cvtsi32_si128(src->data);
						if (src->a < 255) {
bmcr_alpha_blend_single:
							__m128i dstABCD = _mm_cvtsi32_si128(dst->data);
							ALPHA_BLEND_2();
						}
						dst->data = _mm_cvtsi128_si32(srcABCD);
					}
				}
				break;

			case BM_TRANSPARENT:
				/* Make the current colour a bit more black, so it looks like this image is transparent. */
				for (uint x = (uint) bp->width / 2; x > 0; x--) {
					__m128i srcABCD = _mm_loadl_epi64((const __m128i*) src);
					__m128i dstABCD = _mm_loadl_epi64((__m128i*) dst);
					DARKEN_2();
					_mm_storel_epi64((__m128i *) dst, dstAB);
					src += 2;
					dst += 2;
					anim += 2;
					if (src[-2].a) anim[-2] = 0;
					if (src[-1].a) anim[-1] = 0;
				}

				if ((bt_last == BT_NONE && bp->width & 1) || bt_last == BT_ODD) {
					__m128i srcABCD = _mm_cvtsi32_si128(src->data);
					__m128i dstABCD = _mm_cvtsi32_si128(dst->data);
					DARKEN_2();
					dst->data = _mm_cvtsi128_si32(dstAB);
					if (src[0].a) anim[0] = 0;
				}
				break;
		}

next_line:
		if (mode != BM_TRANSPARENT) src_mv_line += si->sprite_width;
		src_rgba_line = (const Colour*) ((const byte*) src_rgba_line + si->sprite_line_size);
		dst_line += bp->pitch;
		anim_line += this->anim_buf_width;
	}
}
IGNORE_UNINITIALIZED_WARNING_STOP

/**
 * Draws a sprite to a (screen) buffer. Calls adequate templated function.
 *
 * @param bp further blitting parameters
 * @param mode blitter mode
 * @param zoom zoom level at which we are drawing
 */
void Blitter_32bppSSE4_Anim::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
{
	switch (mode) {
		case BM_NORMAL: {
			if (bp->skip_left != 0 || bp->width <= MARGIN_NORMAL_THRESHOLD) {
				const BlockType bt_last = (BlockType) (bp->width & 1);
				switch (bt_last) {
					case BT_EVEN: Draw<BM_NORMAL, RM_WITH_SKIP, BT_EVEN>(bp, zoom); return;
					case BT_ODD:  Draw<BM_NORMAL, RM_WITH_SKIP, BT_ODD>(bp, zoom); return;
					default: NOT_REACHED();
				}
			} else {
				Draw<BM_NORMAL, RM_WITH_MARGIN, BT_NONE>(bp, zoom); return;
			}
			break;
		}
		case BM_COLOUR_REMAP:
			if (bp->skip_left != 0 || bp->width <= MARGIN_REMAP_THRESHOLD) {
				Draw<BM_COLOUR_REMAP, RM_WITH_SKIP, BT_NONE>(bp, zoom); return;
			} else {
				Draw<BM_COLOUR_REMAP, RM_WITH_MARGIN, BT_NONE>(bp, zoom); return;
			}
		case BM_TRANSPARENT:  Draw<BM_TRANSPARENT, RM_NONE, BT_NONE>(bp, zoom); return;
		default: NOT_REACHED();
	}
}

/** Same code as seen in 32bpp_sse2.cpp but some macros are not the same. */
inline Colour Blitter_32bppSSE4_Anim::AdjustBrightness(Colour colour, uint8 brightness)
{
	/* Shortcut for normal brightness. */
	if (brightness == DEFAULT_BRIGHTNESS) return colour;

	return Blitter_32bppSSE4::ReallyAdjustBrightness(colour, brightness);
}

#endif /* WITH_SSE */