You don't need to copy the pixels into the streaming texture's pixel data.  This behavior is defined specifically to optimize the UpdateTexture path.

Prefer the OpenGL ES 2.0 context when it's available, make it possible to create an OpenGL 2.0 context on iPhoneOS

--HG--
rename : src/video/SDL_glfuncs.h => src/render/opengl/SDL_glfuncs.h

This compiles, but it untested.

attached is a working directfb driver diff which works with the current
changes. There are a number of changes around it as well, e.g.
configure.in.

The directfb renderdriver right now still depends on a some "includes"
from src/video/directfb. That's why it is not yet moved to the new
render folder.

--HG--
rename : src/render/direct3d/SDL_d3drender.c => src/render/direct3d/SDL_render_d3d.c
rename : src/render/opengl/SDL_renderer_gl.c => src/render/opengl/SDL_render_gl.c
rename : src/render/opengles/SDL_renderer_gles.c => src/render/opengles/SDL_render_gles.c
rename : src/render/software/SDL_renderer_sw.c => src/render/software/SDL_render_sw.c
rename : src/render/software/SDL_renderer_sw_c.h => src/render/software/SDL_render_sw_c.h

--HG--
extra : rebase_source : 8f8bc7a40ab9772086b227ac608b436af048d18a

Added a hint to determine whether framebuffer texture acceleration should be used, and added default behaviors for the various platforms.