KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

indices: add comments, assertions in u_indices.c file 

Reviewed-by: José Fonseca <jfonseca@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Brian Paul 2013-11-13 11:24:41 -07:00
parent 2253fed4a0
commit 491d6397fc
1 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
src/gallium/auxiliary/indices/u_indices.c
View File

@ -42,6 +42,27 @@ static void translate_memcpy_uint( const void *in,
}
/**
* Translate indexes when a driver can't support certain types
* of drawing. Example include:
* - Translate 1-byte indexes into 2-byte indexes
* - Translate PIPE_PRIM_QUADS into PIPE_PRIM_TRIANGLES when the hardware
* doesn't support the former.
* - Translate from first provoking vertex to last provoking vertex and
* vice versa.
*
* \param hw_mask mask of (1 << PIPE_PRIM_x) flags indicating which types
* of primitives are supported by the hardware.
* \param prim incoming PIPE_PRIM_x
* \param in_index_size bytes per index value (1, 2 or 4)
* \param nr number of incoming vertices
* \param in_pv incoming provoking vertex convention (PV_FIRST or PV_LAST)
* \param out_pv desired provoking vertex convention (PV_FIRST or PV_LAST)
* \param out_prim returns new PIPE_PRIM_x we'll translate to
* \param out_index_size returns bytes per new index value (2 or 4)
* \param out_nr returns number of new vertices
* \param out_translate returns the translation function to use by the caller
*/
int u_index_translator( unsigned hw_mask,
unsigned prim,
unsigned in_index_size,
@ -57,6 +78,10 @@ int u_index_translator( unsigned hw_mask,
unsigned out_idx;
int ret = U_TRANSLATE_NORMAL;
assert(in_index_size == 1 ||
in_index_size == 2 ||
in_index_size == 4);
u_index_init();
in_idx = in_size_idx(in_index_size);
@ -67,6 +92,7 @@ int u_index_translator( unsigned hw_mask,
in_index_size == *out_index_size &&
in_pv == out_pv)
{
/* Index translation not really needed */
if (in_index_size == 4)
*out_translate = translate_memcpy_uint;
else