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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;
}
struct u_split_prim {
void *priv;
void (*emit)(void *priv, unsigned start, unsigned count);
void (*edge)(void *priv, boolean enabled);
unsigned mode;
unsigned start;
unsigned p_start;
unsigned p_end;
uint repeat_first:1;
uint close_first:1;
uint edgeflag_off:1;
};
static inline void
u_split_prim_init(struct u_split_prim *s,
unsigned mode, unsigned start, unsigned count)
{
if (mode == PIPE_PRIM_LINE_LOOP) {
s->mode = PIPE_PRIM_LINE_STRIP;
s->close_first = 1;
} else {
s->mode = mode;
s->close_first = 0;
}
s->start = start;
s->p_start = start;
s->p_end = start + count;
s->edgeflag_off = 0;
s->repeat_first = 0;
}
static INLINE boolean
u_split_prim_next(struct u_split_prim *s, unsigned max_verts)
{
int repeat = 0;
if (s->repeat_first) {
s->emit(s->priv, s->start, 1);
max_verts--;
if (s->edgeflag_off) {
s->edge(s->priv, TRUE);
s->edgeflag_off = FALSE;
}
}
if (s->p_start + s->close_first + max_verts >= s->p_end) {
s->emit(s->priv, s->p_start, s->p_end - s->p_start);
if (s->close_first)
s->emit(s->priv, s->start, 1);
return TRUE;
}
switch (s->mode) {
case PIPE_PRIM_LINES:
max_verts &= ~1;
break;
case PIPE_PRIM_LINE_STRIP:
repeat = 1;
break;
case PIPE_PRIM_POLYGON:
max_verts--;
s->emit(s->priv, s->p_start, max_verts);
s->edge(s->priv, FALSE);
s->emit(s->priv, s->p_start + max_verts, 1);
s->p_start += max_verts;
s->repeat_first = TRUE;
s->edgeflag_off = TRUE;
return FALSE;
case PIPE_PRIM_TRIANGLES:
max_verts = max_verts - (max_verts % 3);
break;
case PIPE_PRIM_TRIANGLE_STRIP:
/* to ensure winding stays correct, always split
* on an even number of generated triangles
*/
max_verts = max_verts & ~1;
repeat = 2;
break;
case PIPE_PRIM_TRIANGLE_FAN:
s->repeat_first = TRUE;
repeat = 1;
break;
case PIPE_PRIM_QUADS:
max_verts &= ~3;
break;
case PIPE_PRIM_QUAD_STRIP:
max_verts &= ~1;
repeat = 2;
break;
default:
break;
}
s->emit (s->priv, s->p_start, max_verts);
s->p_start += (max_verts - repeat);
return FALSE;
}
#endif
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