Mercurial > sdl-ios-xcode
view Xcode/TemplatesForProjectBuilder/SDL Cocoa Application/main.c @ 2359:b70b96e615d2 gsoc2008_iphone
These files are the OpenGL ES render driver. You should be able to use them on any platform that supports OpenGL ES -- not just iPhone. The driver is based off the OpenGL render driver.
There are a few differences between OpenGL and OpenGL ES that present difficulties for this driver:
- OpenGL ES does NOT support many pixel formats (for example, no GL_BGR). Also, when using texture functions format and internalFormat must be the same -- this means 32 bit packed formats like SDL_PIXELFORMAT_BGR888 cannot be automatically converted to GL_RGB (which is 24bpp).
- OpenGL ES doesn't have GL_PACK_ROW_LENGTH, which means data must be reformatted before uploading changes to dirty rects. This change has been added.
- OpenGL ES doesn't support paletted textures, though there is an extension. I'm looking into this.
Some other notable differences:
- OpenGL ES has an extension called GL_OES_draw_texture which allows for quicker 2D sprite-type drawing. I use this in GL_RenderCopy when it is available. The iPhone supports the extension, but the iPhone Simulator does not (presently).
- No glBegin() / glEnd() and no GL_QUADS! I'm using glDrawArrays with GL_TRIANGLE_STRIP instead!
author | Holmes Futrell <hfutrell@umail.ucsb.edu> |
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date | Thu, 17 Jul 2008 23:31:42 +0000 |
parents | 4d2d0548f5b2 |
children |
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/* Simple program: Create a blank window, wait for keypress, quit. Please see the SDL documentation for details on using the SDL API: /Developer/Documentation/SDL/docs.html */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> #include "SDL.h" int main(int argc, char *argv[]) { Uint32 initflags = SDL_INIT_VIDEO; /* See documentation for details */ SDL_Surface *screen; Uint8 video_bpp = 0; Uint32 videoflags = SDL_SWSURFACE; int done; SDL_Event event; /* Initialize the SDL library */ if ( SDL_Init(initflags) < 0 ) { fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError()); exit(1); } /* Set 640x480 video mode */ screen=SDL_SetVideoMode(640,480, video_bpp, videoflags); if (screen == NULL) { fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n", video_bpp, SDL_GetError()); SDL_Quit(); exit(2); } done = 0; while ( !done ) { /* Check for events */ while ( SDL_PollEvent(&event) ) { switch (event.type) { case SDL_MOUSEMOTION: break; case SDL_MOUSEBUTTONDOWN: break; case SDL_KEYDOWN: /* Any keypress quits the app... */ case SDL_QUIT: done = 1; break; default: break; } } } /* Clean up the SDL library */ SDL_Quit(); return(0); }