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annotate src/video/SDL_blit_copy.c @ 2661:d38309be5178 gsoc2008_audio_resampling

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The windowed sinc filter generation code seems to be working fine. The FIR filtering code is also now working reasonably well. Occasionally the FIR filter will pop, but setting the normalization factor lower seems to help this. I suspect the problem is in the fixed point multiply/add. I also have a hunch the zero stuffing/sample discarding code is not correct, and I'll look at that soon to get it sorted out.
author Aaron Wishnick <schnarf@gmail.com>
date Wed, 02 Jul 2008 08:04:50 +0000
parents c785543d1843
children cc15254e44b6
rev   line source
2247
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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8 version 2.1 of the License, or (at your option) any later version.
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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parents:
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9
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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10 This library is distributed in the hope that it will be useful,
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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14
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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15 You should have received a copy of the GNU Lesser General Public
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_video.h"
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25 #include "SDL_blit.h"
2254
79e00f5561f4 Oops, didn't want to rename those files...
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26 #include "SDL_blit_copy.h"
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27
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28
2253
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29 #ifdef __SSE__
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30 /* This assumes 16-byte aligned src and dst */
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31 static __inline__ void
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32 SDL_memcpySSE(Uint8 * dst, const Uint8 * src, int len)
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33 {
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34 int i;
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35
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36 __m128 values[4];
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37 for (i = len / 64; i--;) {
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38 _mm_prefetch(src, _MM_HINT_NTA);
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39 values[0] = *(__m128 *) (src + 0);
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40 values[1] = *(__m128 *) (src + 16);
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41 values[2] = *(__m128 *) (src + 32);
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42 values[3] = *(__m128 *) (src + 48);
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43 _mm_stream_ps((float *) (dst + 0), values[0]);
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44 _mm_stream_ps((float *) (dst + 16), values[1]);
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45 _mm_stream_ps((float *) (dst + 32), values[2]);
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46 _mm_stream_ps((float *) (dst + 48), values[3]);
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47 src += 64;
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48 dst += 64;
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49 }
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50
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51 if (len & 63)
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52 SDL_memcpy(dst, src, len & 63);
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53 }
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54 #endif /* __SSE__ */
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55
2247
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56 #ifdef __MMX__
2253
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57 /* This assumes 8-byte aligned src and dst */
2247
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58 static __inline__ void
2248
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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59 SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len)
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60 {
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61 int i;
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62
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63 __m64 values[8];
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64 for (i = len / 64; i--;) {
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5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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65 _mm_prefetch(src, _MM_HINT_NTA);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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66 values[0] = *(__m64 *) (src + 0);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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67 values[1] = *(__m64 *) (src + 8);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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68 values[2] = *(__m64 *) (src + 16);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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69 values[3] = *(__m64 *) (src + 24);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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70 values[4] = *(__m64 *) (src + 32);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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71 values[5] = *(__m64 *) (src + 40);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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72 values[6] = *(__m64 *) (src + 48);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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73 values[7] = *(__m64 *) (src + 56);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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74 _mm_stream_pi((__m64 *) (dst + 0), values[0]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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75 _mm_stream_pi((__m64 *) (dst + 8), values[1]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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76 _mm_stream_pi((__m64 *) (dst + 16), values[2]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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77 _mm_stream_pi((__m64 *) (dst + 24), values[3]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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78 _mm_stream_pi((__m64 *) (dst + 32), values[4]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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79 _mm_stream_pi((__m64 *) (dst + 40), values[5]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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80 _mm_stream_pi((__m64 *) (dst + 48), values[6]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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parents: 2247
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81 _mm_stream_pi((__m64 *) (dst + 56), values[7]);
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82 src += 64;
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83 dst += 64;
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84 }
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85
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86 if (len & 63)
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87 SDL_memcpy(dst, src, len & 63);
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88 }
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89 #endif /* __MMX__ */
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90
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91 void
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92 SDL_BlitCopy(SDL_BlitInfo * info)
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93 {
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94 Uint8 *src, *dst;
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95 int w, h;
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96 int srcskip, dstskip;
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97
2267
c785543d1843 Okay, still some bugs, but everything builds again...
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98 w = info->dst_w * info->dst_fmt->BytesPerPixel;
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99 h = info->dst_h;
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100 src = info->src;
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101 dst = info->dst;
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c785543d1843 Okay, still some bugs, but everything builds again...
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102 srcskip = info->src_pitch;
c785543d1843 Okay, still some bugs, but everything builds again...
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103 dstskip = info->dst_pitch;
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104
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105 #ifdef __SSE__
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106 if (SDL_HasSSE() && !((uintptr_t) src & 15) && !((uintptr_t) dst & 15)) {
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107 while (h--) {
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108 SDL_memcpySSE(dst, src, w);
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109 src += srcskip;
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110 dst += dstskip;
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111 }
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112 return;
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113 }
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114 #endif
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115
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116 #ifdef __MMX__
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5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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117 if (SDL_HasMMX() && !((uintptr_t) src & 7) && !((uintptr_t) dst & 7)) {
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118 while (h--) {
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119 SDL_memcpyMMX(dst, src, w);
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120 src += srcskip;
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121 dst += dstskip;
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122 }
2248
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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123 _mm_empty();
2247
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124 return;
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125 }
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126 #endif
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127
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128 while (h--) {
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129 SDL_memcpy(dst, src, w);
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130 src += srcskip;
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131 dst += dstskip;
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132 }
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133 }
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134
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135 void
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136 SDL_BlitCopyOverlap(SDL_BlitInfo * info)
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137 {
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138 Uint8 *src, *dst;
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139 int w, h;
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140 int skip;
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141
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142 w = info->dst_w * info->dst_fmt->BytesPerPixel;
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143 h = info->dst_h;
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144 src = info->src;
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145 dst = info->dst;
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146 skip = info->src_pitch;
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147 if ((dst < src) || (dst >= (src + h * skip))) {
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148 SDL_BlitCopy(info);
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149 } else {
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150 src += ((h - 1) * skip);
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151 dst += ((h - 1) * skip);
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152 while (h--) {
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153 SDL_revcpy(dst, src, w);
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154 src -= skip;
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155 dst -= skip;
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156 }
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157 }
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158 }
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159
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160 /* vi: set ts=4 sw=4 expandtab: */