Mercurial > sdl-ios-xcode
view README.DC @ 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 | c17d82103614 |
children |
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SDL for Dreamcast (beta2) BERO berobero@users.sourceforge.net http://www.geocities.co.jp/Playtown/2004/ this work with kos-newlib http://sourceforge.net/projects/dcquake/ compile - source environ.sh (from the KOS distribution) - make -f Makefile.dc compile with gl support - install latest libgl from http://sourceforge.net/projects/dcquake/ - uncomment GL=1 in Makefile.dc - make -f Makefile.dc clean - make -f Makefile.dc install - copy include/*.h and libSDL.a or libSDL_gl.a for your enviroment changelog: beta2 - OpenGL support - Hardware page flip support beta - thread, timer don't tested so much. - not support OpenGL