Mercurial > sdl-ios-xcode
view src/video/photon/SDL_photon.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 | be02be2ea897 |
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/* 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_H__ #define __SDL_PHOTON_H__ /* GF headers must be included first for the Photon GF functions */ #if defined(SDL_VIDEO_OPENGL_ES) #include <gf/gf.h> #include <GLES/egl.h> #endif /* SDL_VIDEO_OPENGL_ES */ #include "SDL_config.h" #include "../SDL_sysvideo.h" #include <Ph.h> #include <Pt.h> #include <photon/PkKeyDef.h> /* Maximum display devices, which can handle SDL Photon driver */ #define SDL_VIDEO_PHOTON_MAX_RIDS 16 typedef struct SDL_VideoData { PhRid_t rid[SDL_VIDEO_PHOTON_MAX_RIDS]; uint32_t avail_rids; uint32_t current_device_id; #if defined(SDL_VIDEO_OPENGL_ES) gf_dev_t gfdev; /* GF device handle */ gf_dev_info_t gfdev_info; /* GF device information */ SDL_bool gfinitialized; /* GF device initialization status */ EGLDisplay egldisplay; /* OpenGL ES display connection */ uint32_t egl_refcount; /* OpenGL ES reference count */ uint32_t swapinterval; /* OpenGL ES default swap interval */ EGLContext lgles_context; /* Last used OpenGL ES context */ EGLSurface lgles_surface; /* Last used OpenGL ES target surface */ #endif /* SDL_VIDEO_OPENGL_ES */ } SDL_VideoData; /* This is hardcoded value in photon/Pg.h */ #define SDL_VIDEO_PHOTON_DEVICENAME_MAX 41 #define SDL_VIDEO_PHOTON_MAX_CURSOR_SIZE 128 /* Maximum event message size with data payload */ #define SDL_VIDEO_PHOTON_EVENT_SIZE 8192 /* Current video mode graphics capabilities */ #define SDL_VIDEO_PHOTON_CAP_ALPHA_BLEND 0x00000001 #define SDL_VIDEO_PHOTON_CAP_SCALED_BLIT 0x00000002 typedef struct SDL_DisplayData { uint32_t device_id; uint32_t custom_refresh; /* Custom refresh rate for all modes */ SDL_DisplayMode current_mode; /* Current video mode */ uint8_t description[SDL_VIDEO_PHOTON_DEVICENAME_MAX]; /* Device description */ uint32_t caps; /* Device capabilities */ PhCursorDef_t *cursor; /* Global cursor settings */ SDL_bool cursor_visible; /* SDL_TRUE if cursor visible */ uint32_t cursor_size; /* Cursor size in memory w/ structure */ uint32_t mode_2dcaps; /* Current video mode 2D capabilities */ SDL_bool direct_mode; /* Direct mode state */ #if defined(SDL_VIDEO_OPENGL_ES) gf_display_t display; /* GF display handle */ gf_display_info_t display_info; /* GF display information */ #endif /* SDL_VIDEO_OPENGL_ES */ } SDL_DisplayData; /* Maximum amount of OpenGL ES framebuffer configurations */ #define SDL_VIDEO_GF_OPENGLES_CONFS 32 typedef struct SDL_WindowData { SDL_bool uses_gles; /* if true window must support OpenGL ES */ PtWidget_t *window; /* window handle */ #if defined(SDL_VIDEO_OPENGL_ES) EGLConfig gles_configs[SDL_VIDEO_GF_OPENGLES_CONFS]; /* OpenGL ES framebuffer confs */ EGLint gles_config; /* OpenGL ES configuration index */ EGLContext gles_context; /* OpenGL ES context */ EGLint gles_attributes[256]; /* OpenGL ES attributes for context */ EGLSurface gles_surface; /* OpenGL ES target rendering surface */ gf_surface_t gfsurface; /* OpenGL ES GF's surface */ PdOffscreenContext_t *phsurface; /* OpenGL ES Photon's surface */ #endif /* SDL_VIDEO_OPENGL_ES */ } SDL_WindowData; /****************************************************************************/ /* Low level Photon graphics driver capabilities */ /****************************************************************************/ typedef struct Photon_DeviceCaps { uint8_t *name; uint32_t caps; } Photon_DeviceCaps; #define SDL_PHOTON_UNACCELERATED 0x00000000 #define SDL_PHOTON_ACCELERATED 0x00000001 #define SDL_PHOTON_UNACCELERATED_3D 0x00000000 #define SDL_PHOTON_ACCELERATED_3D 0x00000004 /****************************************************************************/ /* SDL_VideoDevice functions declaration */ /****************************************************************************/ /* Display and window functions */ int photon_videoinit(_THIS); void photon_videoquit(_THIS); void photon_getdisplaymodes(_THIS); int photon_setdisplaymode(_THIS, SDL_DisplayMode * mode); int photon_setdisplaypalette(_THIS, SDL_Palette * palette); int photon_getdisplaypalette(_THIS, SDL_Palette * palette); int photon_setdisplaygammaramp(_THIS, Uint16 * ramp); int photon_getdisplaygammaramp(_THIS, Uint16 * ramp); int photon_createwindow(_THIS, SDL_Window * window); int photon_createwindowfrom(_THIS, SDL_Window * window, const void *data); void photon_setwindowtitle(_THIS, SDL_Window * window); void photon_setwindowicon(_THIS, SDL_Window * window, SDL_Surface * icon); void photon_setwindowposition(_THIS, SDL_Window * window); void photon_setwindowsize(_THIS, SDL_Window * window); void photon_showwindow(_THIS, SDL_Window * window); void photon_hidewindow(_THIS, SDL_Window * window); void photon_raisewindow(_THIS, SDL_Window * window); void photon_maximizewindow(_THIS, SDL_Window * window); void photon_minimizewindow(_THIS, SDL_Window * window); void photon_restorewindow(_THIS, SDL_Window * window); void photon_setwindowgrab(_THIS, SDL_Window * window); void photon_destroywindow(_THIS, SDL_Window * window); /* Window manager function */ SDL_bool photon_getwindowwminfo(_THIS, SDL_Window * window, struct SDL_SysWMinfo *info); /* OpenGL/OpenGL ES functions */ int photon_gl_loadlibrary(_THIS, const char *path); void *photon_gl_getprocaddres(_THIS, const char *proc); void photon_gl_unloadlibrary(_THIS); SDL_GLContext photon_gl_createcontext(_THIS, SDL_Window * window); int photon_gl_makecurrent(_THIS, SDL_Window * window, SDL_GLContext context); int photon_gl_setswapinterval(_THIS, int interval); int photon_gl_getswapinterval(_THIS); void photon_gl_swapwindow(_THIS, SDL_Window * window); void photon_gl_deletecontext(_THIS, SDL_GLContext context); /* Helper function, which re-creates surface, not an API */ int photon_gl_recreatesurface(_THIS, SDL_Window * window, uint32_t width, uint32_t height); /* Event handling function */ void photon_pumpevents(_THIS); /* Screen saver related function */ void photon_suspendscreensaver(_THIS); #endif /* __SDL_PHOTON_H__ */ /* vi: set ts=4 sw=4 expandtab: */