115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/* Originally written by Ben Skeggs for the nv50 driver*/
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#ifndef U_SPLIT_PRIM_H
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#define U_SPLIT_PRIM_H
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#include "pipe/p_defines.h"
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#include "pipe/p_compiler.h"
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#include "util/u_debug.h"
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struct util_split_prim {
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void *priv;
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void (*emit)(void *priv, unsigned start, unsigned count);
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void (*edge)(void *priv, boolean enabled);
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unsigned mode;
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unsigned start;
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unsigned p_start;
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unsigned p_end;
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uint repeat_first:1;
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uint close_first:1;
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uint edgeflag_off:1;
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};
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static INLINE void
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util_split_prim_init(struct util_split_prim *s,
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unsigned mode, unsigned start, unsigned count)
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{
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if (mode == PIPE_PRIM_LINE_LOOP) {
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s->mode = PIPE_PRIM_LINE_STRIP;
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s->close_first = 1;
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} else {
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s->mode = mode;
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s->close_first = 0;
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}
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s->start = start;
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s->p_start = start;
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s->p_end = start + count;
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s->edgeflag_off = 0;
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s->repeat_first = 0;
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}
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static INLINE boolean
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util_split_prim_next(struct util_split_prim *s, unsigned max_verts)
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{
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int repeat = 0;
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if (s->repeat_first) {
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s->emit(s->priv, s->start, 1);
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max_verts--;
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if (s->edgeflag_off) {
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s->edge(s->priv, TRUE);
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s->edgeflag_off = FALSE;
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}
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}
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if ((s->p_end - s->p_start) + s->close_first <= max_verts) {
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s->emit(s->priv, s->p_start, s->p_end - s->p_start);
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if (s->close_first)
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s->emit(s->priv, s->start, 1);
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return TRUE;
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}
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switch (s->mode) {
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case PIPE_PRIM_LINES:
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max_verts &= ~1;
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break;
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case PIPE_PRIM_LINE_STRIP:
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repeat = 1;
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break;
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case PIPE_PRIM_POLYGON:
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max_verts--;
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s->emit(s->priv, s->p_start, max_verts);
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s->edge(s->priv, FALSE);
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s->emit(s->priv, s->p_start + max_verts, 1);
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s->p_start += max_verts;
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s->repeat_first = TRUE;
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s->edgeflag_off = TRUE;
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return FALSE;
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case PIPE_PRIM_TRIANGLES:
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max_verts = max_verts - (max_verts % 3);
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break;
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case PIPE_PRIM_TRIANGLE_STRIP:
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/* to ensure winding stays correct, always split
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* on an even number of generated triangles
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*/
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max_verts = max_verts & ~1;
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repeat = 2;
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break;
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case PIPE_PRIM_TRIANGLE_FAN:
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s->repeat_first = TRUE;
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repeat = 1;
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break;
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case PIPE_PRIM_QUADS:
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max_verts &= ~3;
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break;
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case PIPE_PRIM_QUAD_STRIP:
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max_verts &= ~1;
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repeat = 2;
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break;
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case PIPE_PRIM_POINTS:
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break;
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default:
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/* TODO: implement adjacency primitives */
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assert(0);
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}
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s->emit (s->priv, s->p_start, max_verts);
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s->p_start += (max_verts - repeat);
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return FALSE;
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}
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#endif /* U_SPLIT_PRIM_H */
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