Windows CE support

[Vincent R.]

Hi everyone,

I am a windows mobile developper and recently I wanted to play with openGL
ES and I found  a glut|es project based on freeglut.
Unfortunately it doesn't work with my device using opengl es
implementation from Qualcomm,
so I wanted to restart from latest trunk and apply some patch.
I was surprised to see some preliminary work and a project targetting
embedded Visual Studio (eVC)
but when I imported it inside VS2005 there was a lot of errors so I have
started to make some changes.

To sum up what was necessary:

1) on mobile device we used opengl ES and not openGL and includes are
slighly different because we include
generally <GLES/gl> and <GLES/glues.h> so I have added a GLES folder
inside include folder with a glutes header.
Another option would be to add a folder GLES with inside a header that
would redirect to freeglut_std.h as you already do for desktop platform.

2) On wince there is no errno so you should protect include by #if
HAVE_ERRNO ...

3) Normally opengl es doesn't define the following definitions and code
using it should be protected


#define GL_ACCUM_RED_BITS                 0x0D58
#define GL_ACCUM_GREEN_BITS               0x0D59
#define GL_ACCUM_BLUE_BITS                0x0D5A
#define GL_ACCUM_ALPHA_BITS               0x0D5B


#define GL_RGBA_MODE                      0x0C31
#define GL_DOUBLEBUFFER                   0x0C32
#define GL_STEREO                         0x0C33


However I have defined them in my local opengl es include but maybe it
would be safer to protect
them by a #ifndef _WIN32_WCE.

Finally and this is my biggest issue, in freeglut_display.c you are using
SwapBuffers on windows platforms
but it doesn't exist on windows ce so I wanted to use the same code as
glutes but this is not possible anymore.
Indeed it was using the following lines :

if(fgStructure.Window->Window.SurfaceType == EGL_WINDOW_BIT)
        {
                eglSwapBuffers(fgDisplay.eglDisplay,
fgStructure.Window->Window.Surface);
        }
        else if(fgStructure.Window->Window.SurfaceType == EGL_PIXMAP_BIT)
        {
                InvalidateRect(fgStructure.Window->Window.Handle, NULL, FALSE);
        }

but fgStructure had changed and doesn't have a eglDisplay anymore or at
least I don't know how to get it.

Any idea on how to fix it ?

One last thing you should create a build folder with inside the following
folder :


+ build
  msvc
  msvc-ce
  ...


It would be cleaner that having some folder for each configuration
Visual2008Static, Visual2008, ...
I am ready to help you with this.

Would it be possible to create a branch for me to add support for OpenGL
ES ?
Or maybe I could post regularly some patch to be integrated because ?
What is the best option ?



Regards

Vincent Richomme

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