Mercurial > sdl-ios-xcode
view src/video/os2fslib/SDL_vkeys.h @ 1542:a8bf1aa21020
Fixed bug #15
SDL_blit_A.mmx-speed.patch.txt --
Speed improvements and a bugfix for the current GCC inline mmx
asm code:
- Changed some ops and removed some resulting useless ones.
- Added some instruction parallelism (some gain)
The resulting speed on my Xeon improved upto 35% depending on
the function (measured in fps).
- Fixed a bug where BlitRGBtoRGBSurfaceAlphaMMX() was
setting the alpha component on the destination surfaces (to
opaque-alpha) even when the surface had none.
SDL_blit_A.mmx-msvc.patch.txt --
MSVC mmx intrinsics version of the same GCC asm code.
MSVC compiler tries to parallelize the code and to avoid
register stalls, but does not always do a very good job.
Per-surface blending MSVC functions run quite a bit faster
than their pure-asm counterparts (upto 55% faster for 16bit
ones), but the per-pixel blending runs somewhat slower than asm.
- BlitRGBtoRGBSurfaceAlphaMMX and BlitRGBtoRGBPixelAlphaMMX (and all
variants) can now also handle formats other than (A)RGB8888. Formats
like RGBA8888 and some quite exotic ones are allowed -- like
RAGB8888, or actually anything having channels aligned on 8bit
boundary and full 8bit alpha (for per-pixel alpha blending).
The performance cost of this change is virtually 0 for per-surface
alpha blending (no extra ops inside the loop) and a single non-MMX
op inside the loop for per-pixel blending. In testing, the per-pixel
alpha blending takes a ~2% performance hit, but it still runs much
faster than the current code in CVS. If necessary, a separate function
with this functionality can be made.
This code requires Processor Pack for VC6.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 15 Mar 2006 15:39:29 +0000 |
parents | c9b51268668f |
children | 782fd950bd46 a1b03ba2fcd0 |
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/* 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 */ #ifndef VK_0 #define VK_0 '0' #define VK_1 '1' #define VK_2 '2' #define VK_3 '3' #define VK_4 '4' #define VK_5 '5' #define VK_6 '6' #define VK_7 '7' #define VK_8 '8' #define VK_9 '9' #define VK_A 'A' #define VK_B 'B' #define VK_C 'C' #define VK_D 'D' #define VK_E 'E' #define VK_F 'F' #define VK_G 'G' #define VK_H 'H' #define VK_I 'I' #define VK_J 'J' #define VK_K 'K' #define VK_L 'L' #define VK_M 'M' #define VK_N 'N' #define VK_O 'O' #define VK_P 'P' #define VK_Q 'Q' #define VK_R 'R' #define VK_S 'S' #define VK_T 'T' #define VK_U 'U' #define VK_V 'V' #define VK_W 'W' #define VK_X 'X' #define VK_Y 'Y' #define VK_Z 'Z' #endif /* VK_0 */ /* These keys haven't been defined, but were experimentally determined */ #define VK_SEMICOLON 0xBA #define VK_EQUALS 0xBB #define VK_COMMA 0xBC #define VK_MINUS 0xBD #define VK_PERIOD 0xBE #define VK_SLASH 0xBF #define VK_GRAVE 0xC0 #define VK_LBRACKET 0xDB #define VK_BACKSLASH 0xDC #define VK_RBRACKET 0xDD #define VK_APOSTROPHE 0xDE #define VK_BACKTICK 0xDF