Hi Paul,
I've come up with a macro solution to help out with enabling/disable
certain features so lifting from your example (an illustration of one
of the poorer parts of my current approach for GLES support):
gl3corefeature = isGLExtensionSupported("extension that doesn't exist in GL3");
#ifdef GL3
gl3corefeature = true;
#endif
Changes to:
gl3corefeature = OSG_GL3_FEATURES ||
isGLExtensionSupported("extension that doesn't exist in GL3");
Which avoids the need for any #ifdef's for setting the flags. The way
I have achieved this is to add a OSG_GL1_FEATURES, GL2_FEATURES,
GL3_FEATURES etc. to include/osg/GL thus:
#ifdef OSG_GL1_AVAILABLE
#define OSG_GL1_FEATURES 1
#else
#define OSG_GL1_FEATURES 0
#endif
#ifdef OSG_GL2_AVAILABLE
#define OSG_GL2_FEATURES 1
#else
#define OSG_GL2_FEATURES 0
#endif
#ifdef OSG_GL3_AVAILABLE
#define OSG_GL3_FEATURES 1
#else
#define OSG_GL3_FEATURES 0
#endif
#ifdef OSG_GLES1_AVAILABLE
#define OSG_GLES1_FEATURES 1
#else
#define OSG_GLES1_FEATURES 0
#endif
#ifdef OSG_GLES2_AVAILABLE
#define OSG_GLES2_FEATURES 1
#else
#define OSG_GLES2_FEATURES 0
#endif
Which means the you can use the OSG_*_FEATURES macro as a bool.
I'm just doing a series of build and runtime tests against GL2 and
GLES2 targets, once it's working I'll check the changes in and you'll
hopefully get a better feel for how things are evolving and the
direction to take in the remaining GL3 support.
Robert.
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