aboutsummaryrefslogtreecommitdiff
path: root/backends/platform/ds/arm9/source/blitters.cpp
blob: 44de0ed0f6a6d30d2b2133d921f708a887636ade (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "blitters.h"
#define CHARSET_MASK_TRANSPARENCY 253

//#define PERFECT_5_TO_4_RESCALING

namespace DS {

void asmDrawStripToScreen(int height, int width, byte const *text, byte const *src, byte *dst,
	int vsPitch, int vmScreenWidth, int textSurfacePitch) {

	if (height <= 0)
		height = 1;
	if (width < 4)
		return;

	width &= ~4;
//	src = (const byte *) (((int) (src)) & (~4));
//	dst = (byte *) (((int) (dst)) & (~4));
//	text = (const byte *) (((int) (text)) & (~4));

	asm (	"mov r5, %0\n"				// Height
			"yLoop:\n"
			"mov r3, #0\n"				// X pos

			"xLoop:\n"

			"ldr r4, [%2, r3]\n"		// Load text layer word
			"cmp r4, %5\n"
			"bne singleByteCompare\n"
			"ldr r4, [%3, r3]\n"
			"str r4, [%4, r3]\n"
			"add r3, r3, #4\n"
			"cmp r3, %1\n"				// x == width?
			"blt xLoop\n"

			"add %2, %2, %8\n"			// src += vs->pitch
			"add %3, %3, %6\n"			// dst += _vm->_screenWidth
			"add %4, %4, %7\n"			// text += _textSurface.pitch
			"sub r5, r5, #1\n"			// y -= 1
			"cmp r5, #0\n"				// y == 0?
			"bne yLoop\n"
			"b end\n"


			"singleByteCompare:\n"
			"ldrb r4, [%2, r3]\n"		// Load text byte
			"cmps r4, %5, lsr #24\n"	// Compare with mask
			"strneb r4, [%4, r3]\n"		// Store if not equal
			"ldreqb r4, [%3, r3]\n"		// Otherwise Load src byte
			"streqb r4, [%4, r3]\n"		// Store it
			"add r3, r3, #1\n"

			"ldrb r4, [%2, r3]\n"		// Load text byte
			"cmps r4, %5, lsr #24\n"	// Compare with mask
			"strneb r4, [%4, r3]\n"		// Store if not equal
			"ldreqb r4, [%3, r3]\n"		// Otherwise Load src byte
			"streqb r4, [%4, r3]\n"		// Store it
			"add r3, r3, #1\n"

			"ldrb r4, [%2, r3]\n"		// Load text byte
			"cmps r4, %5, lsr #24\n"	// Compare with mask
			"strneb r4, [%4, r3]\n"		// Store if not equal
			"ldreqb r4, [%3, r3]\n"		// Otherwise Load src byte
			"streqb r4, [%4, r3]\n"		// Store it
			"add r3, r3, #1\n"

			"ldrb r4, [%2, r3]\n"		// Load text byte
			"cmps r4, %5, lsr #24\n"	// Compare with mask
			"strneb r4, [%4, r3]\n"		// Store if not equal
			"ldreqb r4, [%3, r3]\n"		// Otherwise Load src byte
			"streqb r4, [%4, r3]\n"		// Store it
			"add r3, r3, #1\n"

			"cmps r3, %1\n"				// x == width?
			"blt xLoop\n"				// Repeat
			"add %2, %2, %8\n"			// src += vs->pitch
			"add %3, %3, %6\n"			// dst += _vm->_screenWidth
			"add %4, %4, %7\n"			// text += _textSurface.pitch
			"sub r5, r5, #1\n"			// y -= 1
			"cmp r5, #0\n"				// y == 0?
			"bne yLoop\n"

			"end:\n"
		: /* no output registers */
		: "r" (height), "r" (width), "r" (text), "r" (src), "r" (dst), "r" (CHARSET_MASK_TRANSPARENCY | (CHARSET_MASK_TRANSPARENCY << 8) | (CHARSET_MASK_TRANSPARENCY << 16) | (CHARSET_MASK_TRANSPARENCY << 24)),
			"r" (vsPitch), "r" (vmScreenWidth), "r" (textSurfacePitch)
		: "r5", "r3", "r4", "%2", "%3", "%4", "memory");
}



void asmCopy8Col(byte *dst, int dstPitch, const byte *src, int height) {
	asm("ands r0, %3, #1\n"
		 "addne %3, %3, #1\n"
		 "bne roll2\n"

		 "yLoop2:\n"
		 "ldr r0, [%2, #0]\n"
		 "str r0, [%0, #0]\n"
		 "ldr r0, [%2, #4]\n"
		 "str r0, [%0, #4]\n"
		 "add %0, %0, %1\n"
		 "add %2, %2, %1\n"
		 "roll2:\n"
		 "ldr r0, [%2, #0]\n"
		 "str r0, [%0, #0]\n"
		 "ldr r0, [%2, #4]\n"
		 "str r0, [%0, #4]\n"
		 "add %0, %0, %1\n"
		 "add %2, %2, %1\n"
		 "subs %3, %3, #2\n"
		 "bne yLoop2\n"

		: /* no output registers */
		: "r" (dst), "r" (dstPitch), "r" (src), "r" (height)
		: "r0", "%0", "%2", "%3");
}

static bool isDivBy5Ready = false;
static u32  DIV_BY_5[160];

void ComputeDivBy5TableIFN() {
    if (isDivBy5Ready)
        return;
    isDivBy5Ready = true;

    for (int i = 0; i < 160; ++i) {
        DIV_BY_5[i] = (2*i+5)/10;
    }
}

#ifdef PERFECT_5_TO_4_RESCALING
static inline void RescaleBlock_5x1555_To_4x1555( u16 s0, u16 s1, u16 s2, u16 s3, u16 s4,
                                                    u16 *dest) {
    u32 bs0 = s0 & 0x1F;
    u32 bs1 = s1 & 0x1F;
    u32 bs2 = s2 & 0x1F;
    u32 bs3 = s3 & 0x1F;
    u32 bs4 = s4 & 0x1F;

#if 0
    u32 gs0 = (s0 >> 5) & 0x1F;
    u32 gs1 = (s1 >> 5) & 0x1F;
    u32 gs2 = (s2 >> 5) & 0x1F;
    u32 gs3 = (s3 >> 5) & 0x1F;
    u32 gs4 = (s4 >> 5) & 0x1F;

    u32 rs0 = (s0 >> 10) & 0x1F;
    u32 rs1 = (s1 >> 10) & 0x1F;
    u32 rs2 = (s2 >> 10) & 0x1F;
    u32 rs3 = (s3 >> 10) & 0x1F;
    u32 rs4 = (s4 >> 10) & 0x1F;
#else
    // The compiler absolutely wants to use 0x1F as an immediate, which makes it unable to fold the shift during the and
    u32 mask = 0x1F;
    u32 gs0, gs1, gs2, gs3, gs4;
    asm("and %0, %2, %1, lsr #5" : "=r"(gs0) : "r"(s0), "r"(mask) : );
    asm("and %0, %2, %1, lsr #5" : "=r"(gs1) : "r"(s1), "r"(mask) : );
    asm("and %0, %2, %1, lsr #5" : "=r"(gs2) : "r"(s2), "r"(mask) : );
    asm("and %0, %2, %1, lsr #5" : "=r"(gs3) : "r"(s3), "r"(mask) : );
    asm("and %0, %2, %1, lsr #5" : "=r"(gs4) : "r"(s4), "r"(mask) : );
    u32 rs0, rs1, rs2, rs3, rs4;
    asm("and %0, %2, %1, lsr #10" : "=r"(rs0) : "r"(s0), "r"(mask) : );
    asm("and %0, %2, %1, lsr #10" : "=r"(rs1) : "r"(s1), "r"(mask) : );
    asm("and %0, %2, %1, lsr #10" : "=r"(rs2) : "r"(s2), "r"(mask) : );
    asm("and %0, %2, %1, lsr #10" : "=r"(rs3) : "r"(s3), "r"(mask) : );
    asm("and %0, %2, %1, lsr #10" : "=r"(rs4) : "r"(s4), "r"(mask) : );
#endif

    u32 rd0 = 4*rs0 +   rs1;
    u32 rd1 = 2*rs1 + rs1 + 2*rs2;
    u32 rd2 = 2*rs2 + 2*rs3 + rs3;
    u32 rd3 =   rs3 + 4*rs4;

    u32 gd0 = 4*gs0 +   gs1;
    u32 gd1 = 2*gs1 + gs1 + 2*gs2;
    u32 gd2 = 2*gs2 + 2*gs3 + gs3;
    u32 gd3 =   gs3 + 4*gs4;

    u32 bd0 = 4*bs0 +   bs1;
    u32 bd1 = 2*bs1 + bs1 + 2*bs2;
    u32 bd2 = 2*bs2 + 2*bs3 + bs3;
    u32 bd3 =   bs3 + 4*bs4;

#if 0
    // Offsetting for correct rounding
    rd0 = rd0*2+5; rd1 = rd1*2+5; rd2 = rd2*2+5; rd3 = rd3*2+5;
    gd0 = gd0*2+5; gd1 = gd1*2+5; gd2 = gd2*2+5; gd3 = gd3*2+5;
    bd0 = bd0*2+5; bd1 = bd1*2+5; bd2 = bd2*2+5; bd3 = bd3*2+5;

	rd0 = (rd0 * 51) >> 9; rd1 = (rd1 * 51) >> 9; rd2 = (rd2 * 51) >> 9; rd3 = (rd3 * 51) >> 9;
	gd0 = (gd0 * 51) >> 9; gd1 = (gd1 * 51) >> 9; gd2 = (gd2 * 51) >> 9; gd3 = (gd3 * 51) >> 9;
	bd0 = (bd0 * 51) >> 9; bd1 = (bd1 * 51) >> 9; bd2 = (bd2 * 51) >> 9; bd3 = (bd3 * 51) >> 9;
#else
	rd0 = DIV_BY_5[rd0]; rd1 = DIV_BY_5[rd1]; rd2 = DIV_BY_5[rd2]; rd3 = DIV_BY_5[rd3];
	gd0 = DIV_BY_5[gd0]; gd1 = DIV_BY_5[gd1]; gd2 = DIV_BY_5[gd2]; gd3 = DIV_BY_5[gd3];
	bd0 = DIV_BY_5[bd0]; bd1 = DIV_BY_5[bd1]; bd2 = DIV_BY_5[bd2]; bd3 = DIV_BY_5[bd3];
#endif

    u32 d10 = 0x80008000 | (rd1 << 26) | (gd1 << 21) | (bd1 << 16) | (rd0 << 10) | (gd0 << 5) | bd0;
    u32 d32 = 0x80008000 | (rd3 << 26) | (gd3 << 21) | (bd3 << 16) | (rd2 << 10) | (gd2 << 5) | bd2;

    ((u32 *)dest)[0] = d10;
    ((u32 *)dest)[1] = d32;
}
#else
static inline void RescaleBlock_5x1555_To_4x1555( u16 s0, u16 s1, u16 s2, u16 s3, u16 s4,
                                                    u16 *dest) {
    static const u32 MASK = 0x03E07C1F;

    u32 argbargbs0 = u32(s0) | (u32(s0) << 16);
    u32 argbargbs1 = u32(s1) | (u32(s1) << 16);
    u32 argbargbs2 = u32(s2) | (u32(s2) << 16);
    u32 argbargbs3 = u32(s3) | (u32(s3) << 16);
    u32 argbargbs4 = u32(s4) | (u32(s4) << 16);

    u32 grbs0 = argbargbs0 & MASK;
    u32 grbs1 = argbargbs1 & MASK;
    u32 grbs2 = argbargbs2 & MASK;
    u32 grbs3 = argbargbs3 & MASK;
    u32 grbs4 = argbargbs4 & MASK;

    u32 grbd0 = (3*grbs0 +   grbs1) >> 2;
    u32 grbd1 = (  grbs1 +   grbs2) >> 1;
    u32 grbd2 = (  grbs2 +   grbs3) >> 1;
    u32 grbd3 = (  grbs3 + 3*grbs4) >> 2;

    grbd0 &= MASK;
    grbd1 &= MASK;
    grbd2 &= MASK;
    grbd3 &= MASK;

    u32 d0 = grbd0 | (grbd0 >> 16);
    u32 d1 = grbd1 | (grbd1 >> 16);
    u32 d2 = grbd2 | (grbd2 >> 16);
    u32 d3 = grbd3 | (grbd3 >> 16);

    d0 &= 0xFFFF;
    d1 &= 0xFFFF;
    d2 &= 0xFFFF;
    d3 &= 0xFFFF;

    d0 |= 0x8000;
    d1 |= 0x8000;
    d2 |= 0x8000;
    d3 |= 0x8000;

    dest[0] = d0;
    dest[1] = d1;
    dest[2] = d2;
    dest[3] = d3;
}
#endif

static inline void RescaleBlock_5x8888_To_4x1555( u32 s0, u32 s1, u32 s2, u32 s3, u32 s4,
                                                    u16 *dest) {
    u32 d0 = 4*s0 +   s1;
    u32 d1 = 2*s1 +   s1 + 2*s2;

    u32 bd0 = (d0 << 24) >> 24;
    u32 bd1 = (d1 << 24) >> 24;
    u32 gd0 = (d0 << 16) >> 24;
    u32 gd1 = (d1 << 16) >> 24;
    u32 rd0 = (d0 >> 16);
    u32 rd1 = (d1 >> 16);

	rd0 = DIV_BY_5[rd0]; rd1 = DIV_BY_5[rd1];
	gd0 = DIV_BY_5[gd0]; gd1 = DIV_BY_5[gd1];
	bd0 = DIV_BY_5[bd0]; bd1 = DIV_BY_5[bd1];
    u32 d10 = 0x80008000 | (rd1 << 26) | (gd1 << 21) | (bd1 << 16) | (rd0 << 10) | (gd0 << 5) | bd0;
    ((u32 *)dest)[0] = d10;

    u32 d2 = 2*s2 + 2*s3 +   s3;
    u32 d3 =   s3 + 4*s4;

    u32 bd2 = (d2 << 24) >> 24;
    u32 bd3 = (d3 << 24) >> 24;
    u32 gd2 = (d2 << 16) >> 24;
    u32 gd3 = (d3 << 16) >> 24;
    u32 rd2 = (d2 >> 16);
    u32 rd3 = (d3 >> 16);

    rd2 = DIV_BY_5[rd2]; rd3 = DIV_BY_5[rd3];
    gd2 = DIV_BY_5[gd2]; gd3 = DIV_BY_5[gd3];
    bd2 = DIV_BY_5[bd2]; bd3 = DIV_BY_5[bd3];
    u32 d32 = 0x80008000 | (rd3 << 26) | (gd3 << 21) | (bd3 << 16) | (rd2 << 10) | (gd2 << 5) | bd2;

    ((u32 *)dest)[1] = d32;
}

// Can't work in place
#ifdef PERFECT_5_TO_4_RESCALING
static inline void Rescale_320xPAL8Scanline_To_256x1555Scanline(u16 *dest, const u8 *src, const u32 *palette) {
    ComputeDivBy5TableIFN();

    for (size_t i = 0; i < 64; ++i) {
        u32 s0 = palette[src[5*i+0]];
        u32 s1 = palette[src[5*i+1]];
        u32 s2 = palette[src[5*i+2]];
        u32 s3 = palette[src[5*i+3]];
        u32 s4 = palette[src[5*i+4]];

        RescaleBlock_5x8888_To_4x1555(s0, s1, s2, s3, s4, dest+4*i);
    }
}
#else
static inline void Rescale_320xPAL8Scanline_To_256x1555Scanline(u16 *dest, const u8 *src, const u16 *palette) {
    for (size_t i = 0; i < 64; ++i) {
        u16 s0 = palette[src[5*i+0]];
        u16 s1 = palette[src[5*i+1]];
        u16 s2 = palette[src[5*i+2]];
        u16 s3 = palette[src[5*i+3]];
        u16 s4 = palette[src[5*i+4]];

        RescaleBlock_5x1555_To_4x1555(s0, s1, s2, s3, s4, dest+4*i);
    }
}
#endif


// Can work in place, because it's a contraction
static inline void Rescale_320x1555Scanline_To_256x1555Scanline(u16 *dest, const u16 *src) {
    ComputeDivBy5TableIFN();

    for (size_t i = 0; i < 64; ++i) {
        u16 s0 = src[5*i+0];
        u16 s1 = src[5*i+1];
        u16 s2 = src[5*i+2];
        u16 s3 = src[5*i+3];
        u16 s4 = src[5*i+4];

        RescaleBlock_5x1555_To_4x1555(s0, s1, s2, s3, s4, dest+4*i);
    }
}

#ifdef PERFECT_5_TO_4_RESCALING
void Rescale_320x256xPAL8_To_256x256x1555(u16 *dest, const u8 *src, int destStride, int srcStride, const u16 *palette) {
	u32 fastRam[768];

    // Palette lookup -> 0_888
    for (size_t i = 0; i < 256; ++i) {
        u32 col = palette[i];
        u32 result = col & 0x0000001F;
        result |= (col << 3) & 0x00001F00;
        result |= (col << 6) & 0x001F0000;

        fastRam[i] = result;
    }

	for (size_t i = 0; i < 200; ++i) {
		Rescale_320xPAL8Scanline_To_256x1555Scanline(dest + i*destStride, src + i *srcStride, fastRam);
	}
}
#else
void Rescale_320x256xPAL8_To_256x256x1555(u16 *dest, const u8 *src, int destStride, int srcStride, const u16 *palette) {
	u16 fastRam[256];
    for (size_t i = 0; i < 128; ++i)
        ((u32 *)fastRam)[i] = ((const u32*)palette)[i];

	for (size_t i = 0; i < 200; ++i) {
		Rescale_320xPAL8Scanline_To_256x1555Scanline(dest + i*destStride, src + i *srcStride, fastRam);
	}
}
#endif

void Rescale_320x256x1555_To_256x256x1555(u16 *dest, const u16 *src, int destStride, int srcStride) {
	for (size_t i = 0; i < 200; ++i) {
		Rescale_320x1555Scanline_To_256x1555Scanline(dest + i*destStride, src + i *srcStride);
	}
}

} // End of namespace DS