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gallium/draw: additional comments in the clipping code

This commit is contained in:
Brian Paul 2010-05-07 17:13:16 -06:00
parent 3965bc5d22
commit 74fb08018a
1 changed files with 10 additions and 5 deletions
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15
src/gallium/auxiliary/draw/draw_pipe_clip.c
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@ -157,6 +157,10 @@ static void interp( const struct clip_stage *clip,
}
/**
* Emit a post-clip polygon to the next pipeline stage. The polygon
* will be convex and the provoking vertex will always be vertex[0].
*/
static void emit_poly( struct draw_stage *stage,
struct vertex_header **inlist,
unsigned n,
@ -183,16 +187,16 @@ static void emit_poly( struct draw_stage *stage,
header.pad = 0;
for (i = 2; i < n; i++, header.flags = edge_middle) {
/* keep in provoking vertex for flatshading */
/* order the triangle verts to respect the provoking vertex mode */
if (stage->draw->rasterizer->flatshade_first) {
header.v[0] = inlist[0];
header.v[0] = inlist[0]; /* the provoking vertex */
header.v[1] = inlist[i-1];
header.v[2] = inlist[i];
}
else {
header.v[0] = inlist[i-1];
header.v[1] = inlist[i];
header.v[2] = inlist[0];
header.v[2] = inlist[0]; /* the provoking vertex */
}
if (i == n-1)
@ -201,7 +205,8 @@ static void emit_poly( struct draw_stage *stage,
if (0) {
const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader;
uint j, k;
debug_printf("Clipped tri:\n");
debug_printf("Clipped tri: (flat-shade-first = %d)\n",
stage->draw->rasterizer->flatshade_first);
for (j = 0; j < 3; j++) {
for (k = 0; k < vs->info.num_outputs; k++) {
debug_printf(" Vert %d: Attr %d: %f %f %f %f\n", j, k,
@ -307,7 +312,7 @@ do_clip_tri( struct draw_stage *stage,
}
}
/* If flat-shading, copy color to new provoking vertex.
/* If flat-shading, copy provoking vertex color to polygon vertex[0]
*/
if (clipper->flat) {
if (stage->draw->rasterizer->flatshade_first) {