Mercurial > sdl-ios-xcode
view test/testiconv.c @ 5053:b5b42be9333c
Fixed bug #1026
Vittorio Giovara 2010-07-16 19:09:28 PDT
i was reading SDL_renderer_gles and i noticed that every time we there
is some gl call the gl state is modified with a couple of
glEnableClientState()/glDisableClientState.
While this is completely fine for desktops systems, this is a major
performace kill on mobile devices, right where opengles is
implemented.
Normal practice in this case is to update the glstate once, keep it
always the same and disable/enable other states only in very special
occasions.
On the web there's plenty of documentation (on the top of my head
http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html#//apple_ref/doc/uid/TP40008793-CH105-SW5
) and i personally tried this.
I modified my code and got a 10 fps boost, then modified SDL_render_gles and
shifted from 40 fps to 50 fps alone -- considering that i started from ~30fps i
got an 80% performance increase with this technique.
I have attached a dif of my changes, hope that it will be included in
mainstream.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 19 Jan 2011 23:56:16 -0800 |
parents | e906da4414a3 |
children |
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#include <stdio.h> #include "SDL.h" static size_t widelen(char *data) { size_t len = 0; Uint32 *p = (Uint32 *) data; while (*p++) { ++len; } return len; } int main(int argc, char *argv[]) { const char *formats[] = { "UTF8", "UTF-8", "UTF16BE", "UTF-16BE", "UTF16LE", "UTF-16LE", "UTF32BE", "UTF-32BE", "UTF32LE", "UTF-32LE", "UCS4", "UCS-4", }; char buffer[BUFSIZ]; char *ucs4; char *test[2]; int i, index = 0; FILE *file; int errors = 0; if (!argv[1]) { argv[1] = "utf8.txt"; } file = fopen(argv[1], "rb"); if (!file) { fprintf(stderr, "Unable to open %s\n", argv[1]); return (1); } while (fgets(buffer, sizeof(buffer), file)) { /* Convert to UCS-4 */ size_t len; ucs4 = SDL_iconv_string("UCS-4", "UTF-8", buffer, SDL_strlen(buffer) + 1); len = (widelen(ucs4) + 1) * 4; for (i = 0; i < SDL_arraysize(formats); ++i) { test[0] = SDL_iconv_string(formats[i], "UCS-4", ucs4, len); test[1] = SDL_iconv_string("UCS-4", formats[i], test[0], len); if (!test[1] || SDL_memcmp(test[1], ucs4, len) != 0) { fprintf(stderr, "FAIL: %s\n", formats[i]); ++errors; } if (test[0]) { SDL_free(test[0]); } if (test[1]) { SDL_free(test[1]); } } test[0] = SDL_iconv_string("UTF-8", "UCS-4", ucs4, len); SDL_free(ucs4); fputs(test[0], stdout); SDL_free(test[0]); } return (errors ? errors + 1 : 0); }