This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_blit_copy.c
164 lines (146 loc) · 4.07 KB
/
SDL_blit_copy.c
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
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_video.h"
#include "SDL_blit.h"
/* The MMX/SSE intrinsics don't give access to specific registers for
the most memory parallelism, so we'll use GCC inline assembly here...
*/
#ifndef __GNUC__
#undef __MMX__
#undef __SSE__
#endif
#ifdef __MMX__
static __inline__ void
SDL_memcpyMMX(Uint8 *dst, const Uint8 *src, int len)
{
int i;
for (i = len / 64; i--;) {
__asm__ __volatile__ (
"prefetchnta (%0)\n"
"movq (%0), %%mm0\n"
"movq 8(%0), %%mm1\n"
"movq 16(%0), %%mm2\n"
"movq 24(%0), %%mm3\n"
"movq 32(%0), %%mm4\n"
"movq 40(%0), %%mm5\n"
"movq 48(%0), %%mm6\n"
"movq 56(%0), %%mm7\n"
"movntq %%mm0, (%1)\n"
"movntq %%mm1, 8(%1)\n"
"movntq %%mm2, 16(%1)\n"
"movntq %%mm3, 24(%1)\n"
"movntq %%mm4, 32(%1)\n"
"movntq %%mm5, 40(%1)\n"
"movntq %%mm6, 48(%1)\n"
"movntq %%mm7, 56(%1)\n"
:: "r" (src), "r" (dst) : "memory");
src += 64;
dst += 64;
}
if (len & 63)
SDL_memcpy(dst, src, len & 63);
}
#endif /* __MMX__ */
#ifdef __SSE__
static __inline__ void
SDL_memcpySSE(Uint8 *dst, const Uint8 *src, int len)
{
int i;
for (i = len / 64; i--;) {
__asm__ __volatile__ (
"prefetchnta (%0)\n"
"movaps (%0), %%xmm0\n"
"movaps 16(%0), %%xmm1\n"
"movaps 32(%0), %%xmm2\n"
"movaps 48(%0), %%xmm3\n"
"movntps %%xmm0, (%1)\n"
"movntps %%xmm1, 16(%1)\n"
"movntps %%xmm2, 32(%1)\n"
"movntps %%xmm3, 48(%1)\n"
:: "r" (src), "r" (dst) : "memory");
src += 64;
dst += 64;
}
if (len & 63)
SDL_memcpy(dst, src, len & 63);
}
#endif /* __SSE__ */
void
SDL_BlitCopy(SDL_BlitInfo * info)
{
Uint8 *src, *dst;
int w, h;
int srcskip, dstskip;
w = info->d_width * info->dst->BytesPerPixel;
h = info->d_height;
src = info->s_pixels;
dst = info->d_pixels;
srcskip = w + info->s_skip;
dstskip = w + info->d_skip;
#ifdef __SSE__
if (SDL_HasSSE() && !((uintptr_t)src & 15) && !((uintptr_t)dst & 15)) {
while (h--) {
SDL_memcpySSE(dst, src, w);
src += srcskip;
dst += dstskip;
}
return;
}
#endif
#ifdef __MMX__
if (SDL_HasMMX() && !((uintptr_t)src & 7) && !((uintptr_t)dst & 7)) {
while (h--) {
SDL_memcpyMMX(dst, src, w);
src += srcskip;
dst += dstskip;
}
__asm__ __volatile__(" emms\n"::);
return;
}
#endif
while (h--) {
SDL_memcpy(dst, src, w);
src += srcskip;
dst += dstskip;
}
}
void
SDL_BlitCopyOverlap(SDL_BlitInfo * info)
{
Uint8 *src, *dst;
int w, h;
int skip;
w = info->d_width * info->dst->BytesPerPixel;
h = info->d_height;
src = info->s_pixels;
dst = info->d_pixels;
skip = w + info->s_skip;
if ((dst < src) || (dst >= (src + h*skip))) {
SDL_BlitCopy(info);
} else {
src += ((h - 1) * skip);
dst += ((h - 1) * skip);
while (h--) {
SDL_revcpy(dst, src, w);
src -= skip;
dst -= skip;
}
}
}
/* vi: set ts=4 sw=4 expandtab: */