Tell me please ...

[iulik]

Tell me please, how can I invoke a function like glVertex3f that requires floating point arguments,
and how to do it using a minimal  CPU time ?

[hutch--]

iulik,

To use invoke, you must have a prototype for the function you want to call but you can write prototypes that use FP data types. Post in a little more info on the OpenGL function you are trying to use and perhaps someone can help you.

[raymond]

The glVertex3f function requires "floats" as arguments. In Windows system, a "float" is a single precision 32-bit floating point value. It can thus be pushed on the stack just like any other 32-bit value.

Raymond

[MichaelW]

In Franck Charlet's OPENGL.ASM (\masm32\examples\EXAMPLE8\OPENGL) there are examples of passing floats and doubles with invoke.

[raymond]

If your 3 parameters are in consecutive memory locations, you can also use the glVertex3fv instruction which needs only a single parameter, i.e. a pointer to the array where the x/y/z parameters are located.

Raymond