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I added a QGLContextResource class which can be used internally in Qt
for sharing resources between contexts. The QGLContextResource is a
hash map where the context is used as 'key', and the resource is the
'value'. All the sharing contexts point to the same resource, and the
resource is automatically deleted when it is not referenced any more.
Now, the shader manager uses the QGLContextResource class.
I also added a pointer to a struct in the QGLContextPrivate class. The
struct is shared between all the sharing contexts and is deleted
automatically. Currently, the struct only contains the resolved OpenGL
function pointers.
The shared context register code has been simplified.
Reviewed-by: Tom
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Reviewed-by: Trust Me
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Now there's only a copy of the texture glyph cache in graphics memory,
avoiding the system memory copy that we used earlier. In addition the
texture will use the GL_ALPHA texture format when possible, making it
consume less graphics memory as well.
Reviewed-by: Tom
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We now use FBOs to implement render-to-pixmap for the GL pixmap backend.
A multisample FBO is used for rendering, and is then blitted onto a
non-multisample FBO dynamically bound to the relevant texture.
Reviewed-by: Tom
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