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Silence uninitialised variable warnings in SSE blitters
[openttd/fttd.git] / src / blitter / 32bpp_sse4.cpp
blob316bda2fc6ccafe6a773de9075c4421191a7ad3f
1 /* $Id$ */
2
3 /*
4 * This file is part of OpenTTD.
5 * 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.
6 * 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.
7 * 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/>.
8 */
9
10 /** @file 32bpp_sse4.cpp Implementation of the SSE4 32 bpp blitter. */
11
12 #ifdef WITH_SSE
13
14 #include "../stdafx.h"
15 #include "../zoom_func.h"
16 #include "../settings_type.h"
17 #include "32bpp_sse4.hpp"
18
19 /** Instantiation of the SSE4 32bpp blitter factory. */
20 static FBlitter_32bppSSE4 iFBlitter_32bppSSE4;
21
22 /**
23 * Draws a sprite to a (screen) buffer. It is templated to allow faster operation.
24 *
25 * @tparam mode blitter mode
26 * @param bp further blitting parameters
27 * @param zoom zoom level at which we are drawing
28 */
29 IGNORE_UNINITIALIZED_WARNING_START
30 template <BlitterMode mode, Blitter_32bppSSE2::ReadMode read_mode, Blitter_32bppSSE2::BlockType bt_last>
31 inline void Blitter_32bppSSE4::Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom)
32 {
33 const byte * const remap = bp->remap;
34 Colour *dst_line = (Colour *) bp->dst + bp->top * bp->pitch + bp->left;
35 int effective_width = bp->width;
36
37 /* Find where to start reading in the source sprite. */
38 const SpriteData * const sd = (const SpriteData *) bp->sprite;
39 const SpriteInfo * const si = &sd->infos[zoom];
40 const MapValue *src_mv_line = (const MapValue *) &sd->data[si->mv_offset] + bp->skip_top * si->sprite_width;
41 const Colour *src_rgba_line = (const Colour *) ((const byte *) &sd->data[si->sprite_offset] + bp->skip_top * si->sprite_line_size);
42
43 if (read_mode != RM_WITH_MARGIN) {
44 src_rgba_line += bp->skip_left;
45 src_mv_line += bp->skip_left;
46 }
47
48 /* Load these variables into register before loop. */
49 const __m128i a_cm = ALPHA_CONTROL_MASK;
50 const __m128i pack_low_cm = PACK_LOW_CONTROL_MASK;
51 const __m128i briAB_cm = BRIGHTNESS_LOW_CONTROL_MASK;
52 const __m128i div_cleaner = BRIGHTNESS_DIV_CLEANER;
53 const __m128i ob_check = OVERBRIGHT_PRESENCE_MASK;
54 const __m128i ob_mask = OVERBRIGHT_VALUE_MASK;
55 const __m128i ob_cm = OVERBRIGHT_CONTROL_MASK;
56 const __m128i tr_nom_base = TRANSPARENT_NOM_BASE;
57
58 for (int y = bp->height; y != 0; y--) {
59 const Colour *src = src_rgba_line + META_LENGTH;
60 Colour *dst = dst_line;
61 const MapValue *src_mv = src_mv_line;
62
63 switch (mode) {
64 default: {
65 switch (read_mode) {
66 case RM_WITH_MARGIN: {
67 src += src_rgba_line[0].data;
68 dst += src_rgba_line[0].data;
69 const int width_diff = si->sprite_width - bp->width;
70 effective_width = bp->width - (int) src_rgba_line[0].data;
71 const int delta_diff = (int) src_rgba_line[1].data - width_diff;
72 const int new_width = effective_width - (delta_diff & ~1);
73 effective_width = delta_diff > 0 ? new_width : effective_width;
74 if (effective_width <= 0) break;
75 /* FALLTHROUGH */
76 }
77
78 case RM_WITH_SKIP: {
79 for (uint x = (uint) effective_width / 2; x > 0; x--) {
80 __m128i srcABCD = _mm_loadl_epi64((const __m128i*) src);
81 __m128i dstABCD = _mm_loadl_epi64((__m128i*) dst);
82 ALPHA_BLEND_2(pack_low_cm);
83 _mm_storel_epi64((__m128i*) dst, srcABCD);
84 src += 2;
85 dst += 2;
86 }
87 if (bt_last == BT_ODD) {
88 __m128i srcABCD = _mm_cvtsi32_si128(src->data);
89 __m128i dstABCD = _mm_cvtsi32_si128(dst->data);
90 ALPHA_BLEND_2(pack_low_cm);
91 dst->data = _mm_cvtsi128_si32(srcABCD);
92 }
93 break;
94 }
95
96 default: NOT_REACHED();
97 }
98 break;
99 }
100
101 case BM_COLOUR_REMAP: {
102 switch (read_mode) {
103 case RM_WITH_MARGIN: {
104 src += src_rgba_line[0].data;
105 src_mv += src_rgba_line[0].data;
106 dst += src_rgba_line[0].data;
107 const int width_diff = si->sprite_width - bp->width;
108 effective_width = bp->width - (int) src_rgba_line[0].data;
109 const int delta_diff = (int) src_rgba_line[1].data - width_diff;
110 const int new_width = effective_width - delta_diff;
111 effective_width = delta_diff > 0 ? new_width : effective_width;
112 if (effective_width <= 0) break;
113 /* FALLTHROUGH */
114 }
115
116 case RM_WITH_SKIP: {
117 for (uint x = (uint) effective_width / 2; x > 0; x--) {
118 __m128i srcABCD = _mm_loadl_epi64((const __m128i*) src);
119 __m128i dstABCD = _mm_loadl_epi64((__m128i*) dst);
120 uint32 mvX2 = *((uint32 *) const_cast<MapValue *>(src_mv));
121
122 /* Remap colours. */
123 if (mvX2 & 0x00FF00FF) {
124 /* Written so the compiler uses CMOV. */
125 const Colour src0 = src[0];
126 const uint m0 = (byte) mvX2;
127 const uint r0 = remap[m0];
128 const Colour c0map = (this->LookupColourInPalette(r0).data & 0x00FFFFFF) | (src0.data & 0xFF000000);
129 Colour c0 = 0; // Use alpha of 0 to keep dst as is.
130 c0 = r0 == 0 ? c0 : c0map;
131 c0 = m0 != 0 ? c0 : src0;
132 INSR32(c0.data, srcABCD, 0);
133
134 const Colour src1 = src[1];
135 const uint m1 = (byte) (mvX2 >> 16);
136 const uint r1 = remap[m1];
137 const Colour c1map = (this->LookupColourInPalette(r1).data & 0x00FFFFFF) | (src1.data & 0xFF000000);
138 Colour c1 = 0;
139 c1 = r1 == 0 ? c1 : c1map;
140 c1 = m1 != 0 ? c1 : src1;
141 INSR32(c1.data, srcABCD, 1);
142
143 if ((mvX2 & 0xFF00FF00) != 0x80008000) {
144 ADJUST_BRIGHTNESS_2(srcABCD, mvX2);
145 }
146 }
147
148 /* Blend colours. */
149 ALPHA_BLEND_2(pack_low_cm);
150 _mm_storel_epi64((__m128i *) dst, srcABCD);
151 dst += 2;
152 src += 2;
153 src_mv += 2;
154 }
155
156 if (effective_width & 1) {
157 /* In case the m-channel is zero, do not remap this pixel in any way. */
158 __m128i srcABCD;
159 if (src_mv->m) {
160 const uint r = remap[src_mv->m];
161 if (r != 0) {
162 Colour remapped_colour = AdjustBrightness(this->LookupColourInPalette(r), src_mv->v);
163 if (src->a == 255) {
164 *dst = remapped_colour;
165 } else {
166 remapped_colour.a = src->a;
167 srcABCD = _mm_cvtsi32_si128(remapped_colour.data);
168 goto bmcr_alpha_blend_single;
169 }
170 }
171 } else {
172 srcABCD = _mm_cvtsi32_si128(src->data);
173 if (src->a < 255) {
174 bmcr_alpha_blend_single:
175 __m128i dstABCD = _mm_cvtsi32_si128(dst->data);
176 ALPHA_BLEND_2(pack_low_cm);
177 }
178 dst->data = _mm_cvtsi128_si32(srcABCD);
179 }
180 }
181 break;
182 }
183
184 default: NOT_REACHED();
185 }
186 src_mv_line += si->sprite_width;
187 break;
188 }
189
190 case BM_TRANSPARENT: {
191 /* Make the current colour a bit more black, so it looks like this image is transparent.
192 * rgb = rgb * ((256/4) * 4 - (alpha/4)) / ((256/4) * 4)
193 */
194 for (uint x = (uint) bp->width / 2; x > 0; x--) {
195 __m128i srcABCD = _mm_loadl_epi64((const __m128i*) src);
196 __m128i dstABCD = _mm_loadl_epi64((__m128i*) dst);
197 __m128i srcAB = _mm_unpacklo_epi8(srcABCD, _mm_setzero_si128());
198 __m128i dstAB = _mm_unpacklo_epi8(dstABCD, _mm_setzero_si128());
199 __m128i alphaAB = _mm_shuffle_epi8(srcAB, a_cm);
200 alphaAB = _mm_srli_epi16(alphaAB, 2); // Reduce to 64 levels of shades so the max value fits in 16 bits.
201 __m128i nom = _mm_sub_epi16(tr_nom_base, alphaAB);
202 dstAB = _mm_mullo_epi16(dstAB, nom);
203 dstAB = _mm_srli_epi16(dstAB, 8);
204 dstAB = _mm_packus_epi16(dstAB, dstAB);
205 _mm_storel_epi64((__m128i *) dst, dstAB);
206 src += 2;
207 dst += 2;
208 }
209 if (bp->width & 1) {
210 __m128i srcABCD = _mm_cvtsi32_si128(src->data);
211 __m128i dstABCD = _mm_cvtsi32_si128(dst->data);
212 __m128i srcAB = _mm_unpacklo_epi8(srcABCD, _mm_setzero_si128());
213 __m128i dstAB = _mm_unpacklo_epi8(dstABCD, _mm_setzero_si128());
214 __m128i alphaAB = _mm_shuffle_epi8(srcAB, a_cm);
215 alphaAB = _mm_srli_epi16(alphaAB, 2);
216 __m128i nom = _mm_sub_epi16(tr_nom_base, alphaAB);
217 dstAB = _mm_mullo_epi16(dstAB, nom);
218 dstAB = _mm_srli_epi16(dstAB, 8);
219 dstAB = _mm_packus_epi16(dstAB, dstAB);
220 dst->data = _mm_cvtsi128_si32(dstAB);
221 }
222
223 break;
224 }
225 }
226
227 src_rgba_line = (const Colour*) ((const byte*) src_rgba_line + si->sprite_line_size);
228 dst_line += bp->pitch;
229 }
230 }
231 IGNORE_UNINITIALIZED_WARNING_STOP
232
233 /**
234 * Draws a sprite to a (screen) buffer. Calls adequate templated function.
235 *
236 * @param bp further blitting parameters
237 * @param mode blitter mode
238 * @param zoom zoom level at which we are drawing
239 */
240 void Blitter_32bppSSE4::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
241 {
242 const BlockType bt_last = (BlockType) (bp->width & 1);
243 switch (mode) {
244 case BM_NORMAL: {
245 if (bp->skip_left != 0 || bp->width <= MARGIN_NORMAL_THRESHOLD) {
246 switch (bt_last) {
247 case BT_EVEN: Draw<BM_NORMAL, RM_WITH_SKIP, BT_EVEN>(bp, zoom); return;
248 case BT_ODD: Draw<BM_NORMAL, RM_WITH_SKIP, BT_ODD>(bp, zoom); return;
249 default: NOT_REACHED();
250 }
251 } else {
252 switch (bt_last) {
253 case BT_EVEN: Draw<BM_NORMAL, RM_WITH_MARGIN, BT_EVEN>(bp, zoom); return;
254 case BT_ODD: Draw<BM_NORMAL, RM_WITH_MARGIN, BT_ODD>(bp, zoom); return;
255 default: NOT_REACHED();
256 }
257 }
258 break;
259 }
260 case BM_COLOUR_REMAP:
261 if (bp->skip_left != 0 || bp->width <= MARGIN_REMAP_THRESHOLD) {
262 Draw<BM_COLOUR_REMAP, RM_WITH_SKIP, BT_NONE>(bp, zoom); return;
263 } else {
264 Draw<BM_COLOUR_REMAP, RM_WITH_MARGIN, BT_NONE>(bp, zoom); return;
265 }
266 case BM_TRANSPARENT: Draw<BM_TRANSPARENT, RM_NONE, BT_NONE>(bp, zoom); return;
267 default: NOT_REACHED();
268 }
269 }
270
271 /** Same code as seen in 32bpp_sse2.cpp but some macros are not the same. */
272 inline Colour Blitter_32bppSSE4::AdjustBrightness(Colour colour, uint8 brightness)
273 {
274 /* Shortcut for normal brightness. */
275 if (brightness == DEFAULT_BRIGHTNESS) return colour;
276
277 return Blitter_32bppSSE4::ReallyAdjustBrightness(colour, brightness);
278 }
279
280 IGNORE_UNINITIALIZED_WARNING_START
281 /* static */ Colour Blitter_32bppSSE4::ReallyAdjustBrightness(Colour colour, uint8 brightness)
282 {
283 uint64 c16 = colour.b | (uint64) colour.g << 16 | (uint64) colour.r << 32;
284 c16 *= brightness;
285 uint64 c16_ob = c16; // Helps out of order execution.
286 c16 /= DEFAULT_BRIGHTNESS;
287 c16 &= 0x01FF01FF01FFULL;
288
289 /* Sum overbright (maximum for each rgb is 508, 9 bits, -255 is changed in -256 so we just have to take the 8 lower bits into account). */
290 c16_ob = (((c16_ob >> (8 + 7)) & 0x0100010001ULL) * 0xFF) & c16;
291 uint64 ob = (uint16) c16_ob + (uint16) (c16_ob >> 16) + (uint16) (c16_ob >> 32);
292
293 const uint32 alpha32 = colour.data & 0xFF000000;
294 __m128i ret;
295 INSR64(c16, ret, 0);
296 if (ob != 0) {
297 /* Reduce overbright strength. */
298 ob /= 2;
299 __m128i ob128;
300 INSR64(ob | ob << 16 | ob << 32, ob128, 0);
301 __m128i white = OVERBRIGHT_VALUE_MASK;
302 __m128i c128 = ret;
303 ret = _mm_subs_epu16(white, c128); /* PSUBUSW, (255 - rgb) */
304 ret = _mm_mullo_epi16(ret, ob128); /* PMULLW, ob*(255 - rgb) */
305 ret = _mm_srli_epi16(ret, 8); /* PSRLW, ob*(255 - rgb)/256 */
306 ret = _mm_add_epi16(ret, c128); /* PADDW, ob*(255 - rgb)/256 + rgb */
307 }
308
309 ret = _mm_packus_epi16(ret, ret); /* PACKUSWB, saturate and pack. */
310 return alpha32 | _mm_cvtsi128_si32(ret);
311 }
312 IGNORE_UNINITIALIZED_WARNING_STOP
313
314 #endif /* WITH_SSE */