Gabriele Cosmo
81 lines
2.1 KiB
Plaintext
81 lines
2.1 KiB
Plaintext
// Copyright (C) 2010, Guy Barrand. All rights reserved.
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// See the file tools.license for terms.
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#ifndef tools_platform
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#define tools_platform
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// We do not byteswap on intel (LE) (common platform).
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// We have then a better compression on these machines.
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// NOTE : this is the contrary to what is done in CERN-ROOT (and Rio).
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/* We prefer to handle endianity dynamically, but with cpp macro
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it would looks like (from luaconf.h) :
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#if defined(__i386__) || defined(__i386) || \
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defined(__X86__) || defined (__x86_64)
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#define TOOLS_IS_BE 0
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#define TOOLS_IS_LE 1
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#elif defined(__POWERPC__) || defined(__ppc__)
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#define TOOLS_IS_BE 1
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#define TOOLS_IS_LE 0
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#endif
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*/
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namespace tools {
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inline bool is_little_endian() {
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unsigned int i = 1;
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unsigned char* b = (unsigned char*)&i;
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// BE = Big Endian, LE = Little Endian.
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// The Intels x86 are LE.
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// Mac PPC b[3] is 1 (BE)
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// Mac Intel b[0] is 1 (LE)
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// Linux i386 b[0] is 1 (LE)
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// Linux x86_64 b[0] is 1 (LE)
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return (b[0]==1?true:false);
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}
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}
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#if defined(__APPLE__)
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#include <TargetConditionals.h>
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#endif
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namespace tools {
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namespace device {
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#if defined(ANDROID) || TARGET_OS_IPHONE
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inline bool small_screen() {return true;}
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#elif defined(EMSCRIPTEN)
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inline bool small_screen() {return false;}
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#else
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inline bool small_screen() {return false;}
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#endif
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inline unsigned int tex_mem_limit() {
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// glGet(GL_MAX_TEXTURE_SIZE) :
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// MacBookPro : it returns 8192.
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// SGS : it returns 2048.
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// iPad1 : it returns 2048.
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// iPod : it returns ?
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// Nexus 10 : it returns ?
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// 1024*1024 //*3 = 3 145 728
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// 2048*2048 //*3 = 12 582 912
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// 4096*4096 //*3 = 50 331 648
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// 8192*8192 //*3 = 201 326 592
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// 8192*4096 //*3 = 100 663 296
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if(small_screen()) {
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//iOS : Apple says that max 2D tex size is 1024*1024 with two units
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// texture available. From doc on PowerVR MBX.
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return 2048*2048*3;
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} else {
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//limit = 4096*4096*3; //=8192*2048 //permit to pass ATLAS big image.
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//permit to pass fete_science_2010/power2/image_0.jpg
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return 8192*4096*3; //100663296
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}
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}
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}}
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#endif
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