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annotate src/video/SDL_blit_copy.c @ 5157:fb424691cfc7

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Moved the rendering code out to a separate directory in the hope that it can someday be completely decoupled from the rest of the library and be expanded to an awesome 2D on 3D library.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 02 Feb 2011 14:34:54 -0800
parents f7b03b6838cb
children b530ef003506
rev   line source
2247
93994f65c74c Removed hermes since it's LGPL and not compatible with a commercial license.
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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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
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8 version 2.1 of the License, or (at your option) any later version.
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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,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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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.
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14
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15 You should have received a copy of the GNU Lesser General Public
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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"
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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
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56 #ifdef __MMX__
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57 #ifdef _MSC_VER
cc15254e44b6 Disable spurious warning
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58 #pragma warning(disable:4799)
cc15254e44b6 Disable spurious warning
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59 #endif
2253
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60 /* This assumes 8-byte aligned src and dst */
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61 static __inline__ void
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62 SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len)
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63 {
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64 int i;
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65
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66 __m64 values[8];
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67 for (i = len / 64; i--;) {
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68 #ifdef __SSE__
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5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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69 _mm_prefetch(src, _MM_HINT_NTA);
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70 #endif
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71 values[0] = *(__m64 *) (src + 0);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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72 values[1] = *(__m64 *) (src + 8);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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73 values[2] = *(__m64 *) (src + 16);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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74 values[3] = *(__m64 *) (src + 24);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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75 values[4] = *(__m64 *) (src + 32);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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76 values[5] = *(__m64 *) (src + 40);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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77 values[6] = *(__m64 *) (src + 48);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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78 values[7] = *(__m64 *) (src + 56);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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79 _mm_stream_pi((__m64 *) (dst + 0), values[0]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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80 _mm_stream_pi((__m64 *) (dst + 8), values[1]);
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81 _mm_stream_pi((__m64 *) (dst + 16), values[2]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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82 _mm_stream_pi((__m64 *) (dst + 24), values[3]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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83 _mm_stream_pi((__m64 *) (dst + 32), values[4]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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84 _mm_stream_pi((__m64 *) (dst + 40), values[5]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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85 _mm_stream_pi((__m64 *) (dst + 48), values[6]);
5cd2a2293cf0 Okay, I figured out the intrinsics for SIMD memcpy
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86 _mm_stream_pi((__m64 *) (dst + 56), values[7]);
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87 src += 64;
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88 dst += 64;
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89 }
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90
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91 if (len & 63)
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92 SDL_memcpy(dst, src, len & 63);
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93 }
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94 #endif /* __MMX__ */
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95
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96 void
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97 SDL_BlitCopy(SDL_BlitInfo * info)
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98 {
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99 Uint8 *src, *dst;
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100 int w, h;
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101 int srcskip, dstskip;
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102
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c785543d1843 Okay, still some bugs, but everything builds again...
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103 w = info->dst_w * info->dst_fmt->BytesPerPixel;
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bee005ace1bf Work in progress: merging new texture features into SDL blit system
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104 h = info->dst_h;
bee005ace1bf Work in progress: merging new texture features into SDL blit system
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105 src = info->src;
bee005ace1bf Work in progress: merging new texture features into SDL blit system
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106 dst = info->dst;
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c785543d1843 Okay, still some bugs, but everything builds again...
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107 srcskip = info->src_pitch;
c785543d1843 Okay, still some bugs, but everything builds again...
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108 dstskip = info->dst_pitch;
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109
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110 #ifdef __SSE__
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111 if (SDL_HasSSE() &&
cd4a49d5c1ba Fixed crash on 64-bit systems
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112 !((uintptr_t) src & 15) && !(srcskip & 15) &&
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113 !((uintptr_t) dst & 15) && !(dstskip & 15)) {
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114 while (h--) {
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115 SDL_memcpySSE(dst, src, w);
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116 src += srcskip;
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117 dst += dstskip;
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118 }
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119 return;
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120 }
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121 #endif
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122
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123 #ifdef __MMX__
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124 if (SDL_HasMMX() &&
cd4a49d5c1ba Fixed crash on 64-bit systems
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125 !((uintptr_t) src & 7) && !(srcskip & 7) &&
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126 !((uintptr_t) dst & 7) && !(dstskip & 7)) {
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127 while (h--) {
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128 SDL_memcpyMMX(dst, src, w);
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129 src += srcskip;
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130 dst += dstskip;
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131 }
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132 _mm_empty();
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133 return;
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134 }
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135 #endif
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136
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137 while (h--) {
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138 SDL_memcpy(dst, src, w);
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139 src += srcskip;
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140 dst += dstskip;
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141 }
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142 }
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143
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144 void
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145 SDL_BlitCopyOverlap(SDL_BlitInfo * info)
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146 {
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147 Uint8 *src, *dst;
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148 int w, h;
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149 int skip;
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150
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151 w = info->dst_w * info->dst_fmt->BytesPerPixel;
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152 h = info->dst_h;
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153 src = info->src;
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154 dst = info->dst;
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155 skip = info->src_pitch;
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156 if ((dst < src) || (dst >= (src + h * skip))) {
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157 SDL_BlitCopy(info);
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158 } else {
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159 src += ((h - 1) * skip);
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160 dst += ((h - 1) * skip);
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161 while (h--) {
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162 SDL_revcpy(dst, src, w);
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163 src -= skip;
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164 dst -= skip;
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165 }
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166 }
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167 }
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168
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169 /* vi: set ts=4 sw=4 expandtab: */