Andre Werthmann wrote:
>
> Hello,
>
> Can you help me please with the following questions ?
>
> my first question is:
>
> Is the memory where the parameters (f, m, obj) are pointing to 16 byte aligned ?
> It is somewhat important for using some of the new P3-SIMD instructions.
>
> for example in
> static void transform_v16(GLfloat *f, const GLfloat *m, const GLfloat *obj, GLuint
>obj_stride, GLuint count )
>
> the second question:
>
> How are the vertices organized ? Are they organized x0,y0,z0, x1, y1, z1, ... (as an
>array of structures)
> or x0, x1, x2, x3, .., xn, y0, y1, y2, y3, ..., yn, z0, z1, z2, z3, .., zn where n
>is count (as a structure of arrays) ?
These arrays typically originate from the client via glVertexPointer. It should
be possible to add a test for alignment and force a copy (perhaps in
gl_prepare_arrays_cva()?) if they are found to be misaligned.
The values are arranged x0,y0,z0,x1,y1,z1 ... There are 'C' implementations of
each of these functions in vertices.c and x86 and 3dnow implementations in
X86/vertex.S and X86/vertex_3dnow.S.
Keith
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