Hi,
In the implementation of a Drawable subclass, I am trying to use regular GL
functions to render primitives through vertex buffer objects. Like so:
Init:
Code:
Drawable::Extensions* ext = getExtensions(state.getContextID(), true);
GLfloat v[] = {
0.0f, 0.0f, 0.0f, 1.0f,
2.0f, 0.0f, 0.0f, 1.0f,
2.0f, 2.0f, 0.0f, 1.0f
};
ext->glGenBuffers(1, & b);
ext->glBindBuffer(GL_ARRAY_BUFFER_ARB, b);
ext->glBufferData(GL_ARRAY_BUFFER_ARB, sizeof(v), v, GL_STATIC_DRAW);
drawImplementation(..)
Code:
osg::State& state = *renderInfo.getState();
Drawable::Extensions* ext = getExtensions(state.getContextID(), true);
ext->glBindBuffer(GL_ARRAY_BUFFER_ARB, b);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(4, GL_FLOAT, 0, 0);
glDrawArrays(GL_POINTS, 0, 3);
glDisableClientState(GL_VERTEX_ARRAY);
ext->glBindBuffer(GL_ARRAY_BUFFER_ARB, 0);
But, nothing shows up on the screen. There are no GL errors reported. Changing
the code to use regular vertex arrays (without binding the vbo and changing the
glVertexPointer call to take an array), things shows up fine. Ofcourse, this is
not what I want.
I even created a stand-alone skeleton GL application with this kind of
implementation, and as expected, it works fine.
So, it must be the case that OSG does some trickery of its own. The question
is, what could that be? :?
Thank you!
Cheers,
Mattias
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=23125#23125
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