Mercurial > sdl-ios-xcode
view src/video/photon/SDL_photon_render.h @ 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 | f7b03b6838cb |
children |
line wrap: on
line source
/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2010 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 QNX Photon GUI SDL driver Copyright (C) 2009 Mike Gorchak (mike@malva.ua, lestat@i.com.ua) */ #ifndef __SDL_PHOTON_RENDER_H__ #define __SDL_PHOTON_RENDER_H__ #include "../SDL_sysvideo.h" #include <Ph.h> #include <photon/PhRender.h> #define SDL_PHOTON_MAX_SURFACES 3 #define SDL_PHOTON_SURFTYPE_UNKNOWN 0x00000000 #define SDL_PHOTON_SURFTYPE_OFFSCREEN 0x00000001 #define SDL_PHOTON_SURFTYPE_PHIMAGE 0x00000002 #define SDL_PHOTON_UNKNOWN_BLEND 0x00000000 #define SDL_PHOTON_DRAW_BLEND 0x00000001 #define SDL_PHOTON_TEXTURE_BLEND 0x00000002 typedef struct SDL_RenderData { SDL_bool enable_vsync; /* VSYNC flip synchronization enable */ uint32_t surface_visible_idx; /* Index of visible surface */ uint32_t surface_render_idx; /* Index of render surface */ uint32_t surfaces_count; /* Amount of allocated surfaces */ uint32_t surfaces_type; /* Type of allocated surfaces */ uint32_t window_width; /* Last active window width */ uint32_t window_height; /* Last active window height */ PhGC_t* gc; /* Graphics context */ SDL_bool direct_mode; /* Direct Mode state */ PdOffscreenContext_t* osurfaces[SDL_PHOTON_MAX_SURFACES]; PhImage_t* psurfaces[SDL_PHOTON_MAX_SURFACES]; PmMemoryContext_t* pcontexts[SDL_PHOTON_MAX_SURFACES]; } SDL_RenderData; typedef struct SDL_TextureData { uint32_t surface_type; PdOffscreenContext_t* osurface; PhImage_t* psurface; PmMemoryContext_t* pcontext; } SDL_TextureData; extern void photon_addrenderdriver(_THIS); /* Helper function, which redraws the backbuffer */ int _photon_update_rectangles(SDL_Renderer* renderer, PhRect_t* rect); #endif /* __SDL_PHOTON_RENDER_H__ */ /* vi: set ts=4 sw=4 expandtab: */