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#ifndef __NOUVEAU_UTIL_H__
#define __NOUVEAU_UTIL_H__
/* Determine how many vertices can be pushed into the command stream.
* Where the remaining space isn't large enough to represent all verices,
* split the buffer at primitive boundaries.
*
* Returns a count of vertices that can be rendered, and an index to
* restart drawing at after a flush.
*/
static INLINE unsigned
nouveau_vbuf_split(unsigned remaining, unsigned overhead, unsigned vpp,
unsigned mode, unsigned start, unsigned count,
unsigned *restart)
{
int max, adj = 0;
max = remaining - overhead;
if (max < 0)
return 0;
max *= vpp;
if (max >= count)
return count;
switch (mode) {
case PIPE_PRIM_POINTS:
break;
case PIPE_PRIM_LINES:
max = max & 1;
break;
case PIPE_PRIM_TRIANGLES:
max = max - (max % 3);
break;
case PIPE_PRIM_QUADS:
max = max & ~3;
break;
case PIPE_PRIM_LINE_LOOP:
case PIPE_PRIM_LINE_STRIP:
if (max < 2)
max = 0;
adj = 1;
break;
case PIPE_PRIM_POLYGON:
case PIPE_PRIM_TRIANGLE_STRIP:
case PIPE_PRIM_TRIANGLE_FAN:
if (max < 3)
max = 0;
adj = 2;
break;
case PIPE_PRIM_QUAD_STRIP:
if (max < 4)
max = 0;
adj = 3;
break;
default:
assert(0);
}
*restart = start + max - adj;
return max;
}
/* Integer base-2 logarithm, rounded towards zero. */
static INLINE unsigned log2i(unsigned i)
{
unsigned r = 0;
if (i & 0xffff0000) {
i >>= 16;
r += 16;
}
if (i & 0x0000ff00) {
i >>= 8;
r += 8;
}
if (i & 0x000000f0) {
i >>= 4;
r += 4;
}
if (i & 0x0000000c) {
i >>= 2;
r += 2;
}
if (i & 0x00000002) {
r += 1;
}
return r;
}
#endif
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