On Mon, 10 Mar 2003 22:23:07 +0000
José Fonseca <[EMAIL PROTECTED]> wrote:
[snip]
> As I said above this can be done in C++, and without damage to
> efficiency.
>
> Imagine you have a TnL abstract class:
>
> class TNL {
> // A OpenGL function
> virtual void Coord3f(GLfloat x, GLfloat y, GLfloat z) = 0;
>
> // Activate
> virtual void activate() = 0;
>
> protected:
> struct dispatch_table *my_dispatch_table;
> } ;
>
> and then you have two inherited classes for software and hardware
> rendering:
>
> class SoftwareTNL : public TNL {
> // The software version. Note the _inline_
> inline void Coord3f(x, y, z) {
> _mesa_swrast_deal_with_this_vertex(x, y, z);
> }
> };
>
> class HardwareTNL : public TNL {
> // The hardware version. Note the _inline_
> inline void Coord3f(x, y, z) {
> _add_vertex_to_DMA_buffer(x, y, z);
> }
> };
>
> and then the C-callable versions for the glapi disptach table:
>
> void softwareCoord3f(GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z) {
> Driver::Context *context = ctx;
> Driver::SoftwareTNL &tnl = ctx->tnl;
>
> // There will be no call as the function will be expanded inline
> tnl.Coord3F(x, y, z);
> }
Here you're converting a GLcontext * to a Driver::Context *. Can you do
that because Mesa::Context has GLcontext as first member? Anyway, if
that didn't work you could always do some fancy pointer arithmetics with
the offset of the GLcontext in Driver::Context.
But then, if the GLcontext is a member (not a pointer) in Mesa::Context,
then it would have to be created by the constructor of Mesa::Context.
Just checked in radeonCreateContext, the GLcontext is really created
there by calling _mesa_create_context. But _mesa_create_context returns
a pointer to the GLcontext. You would need a _mesa_create_context which
takes a GLcontext pointer as a parameter.
Maybe I'm getting lost in details, but IME it's better to stumble sooner
than later. Disclaimer: I support the idea of a C++ framework for DRI
driver development. ;-)
[snip]
> José Fonseca
Regards,
Felix
------------ __\|/__ ___ ___ -------------------------
Felix ___\_e -_/___/ __\___/ __\_____ You can do anything,
Kühling (_____\Ä/____/ /_____/ /________) just not everything
[EMAIL PROTECTED] \___/ \___/ U at the same time.
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