Route WGL context code through gdi32.dll

[Roderick Colenbrander]

Hi,

This is the first patch in a series of patches which will change the routing of wgl OpenGL calls.

Before my opengl32 rewrite all the wgl functions were inside opengl32.dll. I have moved (allmost) all wgl code over to winex11.drv. The old wgl code used ExtEscape hacks to access X datatypes. Because I just moved the code over to winex11.drv the current code still uses these hacks.

These hacks shouldn't be needed inside x11drv but getting rid of those takes some work. The X information which is needed by the wgl calls in stored in a 'PhysDev' structure which is basicly the driver equivalent of a 'hDC'. Right now the wgl functions receive a hDC but converting it to a PhysDev is done inside gdi32.dll. In order for wgl functions to get access to a physdev the functions need to be routed through gdi32 to winex11.drv

This patch routes wglCreateContext/wglMakeCurrent through gdi32.dll. For this I have added a new file opengl.c which does the routing. I have added the right prototypes to the code which loads functions from the display driver and I have changed the routing in opengl32's spec file.

Note that right now the following happens a few times for two of the WGL extension functions: opengl32 -> x11drv.foobar{ gdi32->foobar -> x11drv.foobar } So some code inside winex11.drv calls a GDI32 function to call another function inside winex11.drv. This is not nice but will be removed in a later step. Rewriting this function takes some more work and increases the size of the patch a lot. I plan to do this after most code has been moved.

Regards,
Roderick Colenbrander

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