Eero Pajarre wrote:
>
> Some time ago I reported problems with using CVA and flat triangles.
> Now I have a problem which might be related, at least this happens when
> I (again) used flat shaded triangles (by accident (again)).
>
> This time I think I have been able to locate the problem pretty well...
>
> Here is the "stack dump", sorry for the wrapping lines:
> gl_clip_interp_color_tex(vertex_buffer * 0x0a94c9b8, unsigned int 3000,
> float 0.515227, unsigned int 184, unsigned int 186) line 132
> viewclip_polygon_4(vertex_buffer * 0x0a94c9b8, unsigned int 3, unsigned
> int * 0x01623718, unsigned char 31) line 129 + 761 bytes
> gl_render_clipped_triangle(gl_context * 0x06200070, unsigned int 3,
> unsigned int * 0x01623718, unsigned int 186) line 233 + 37 bytes
> cva_render_tris_indirect(vertex_buffer * 0x0a94c9b8, vertex_buffer *
> 0x0a94c9b8, const gl_prim_state * 0x1013c598, unsigned int 0, unsigned
> int 618) line 157 + 140 bytes
> fxDDRenderCVAElements(vertex_buffer * 0x0a94c9b8, int 4, unsigned int *
> 0x0a8f7ea0, unsigned int 618) line 454 + 21 bytes
> gl_DrawElements(gl_context * 0x06200070, int 4, int 618, int 5125, void
> * 0x0a8f7ea0) line 1007 + 31 bytes
> glDrawElements(int 4, int 618, int 5125, void * 0x0a8f7ea0) line 797 +
> 28 bytes
>
> This is my reasoning what happens:
>
> When the clip routine at the top is called the dst parameter is set to
> 3000,
> because the VB->FirstFree was 3000. But the vertex buffer which is in
> use is
> actually a CVA buffer which only has space for 3000 elements in it.
The buffer will actually have 3024 elements, leaving enough room for the
clipped vertices. I think the problem is because VB->ColorPtr is zero
or pointing to invalid memory. I've fixed a problem in this area in the
experimental branch. Is it inconvenient to check if it solves your
problem? I should backport this anyway, I guess...
Keith
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