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Fix broken depth offset.

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The edge vectors were totally wrong.
Need to multiply bias units by the min resolvable depth delta.
This commit is contained in:
Brian 2007-07-11 13:02:03 -06:00
parent bc4dd63f12
commit aac2129663
1 changed files with 6 additions and 5 deletions
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11
src/mesa/pipe/draw/draw_offset.c
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@ -54,8 +54,9 @@ static INLINE struct offset_stage *offset_stage( struct prim_stage *stage )
static void offset_begin( struct prim_stage *stage )
{
struct offset_stage *offset = offset_stage(stage);
GLfloat mrd = 1.0 / 65535.0; /* XXX this depends on depthbuffer bits! */
offset->units = stage->draw->setup.offset_units;
offset->units = stage->draw->setup.offset_units * mrd;
offset->scale = stage->draw->setup.offset_scale;
stage->next->begin( stage->next );
@ -79,11 +80,11 @@ static void do_offset_tri( struct prim_stage *stage,
GLfloat *v2 = header->v[2]->data[0];
/* edge vectors e = v0 - v2, f = v1 - v2 */
GLfloat ex = v0[0] - v2[2];
GLfloat ey = v0[1] - v2[2];
GLfloat ex = v0[0] - v2[0];
GLfloat ey = v0[1] - v2[1];
GLfloat ez = v0[2] - v2[2];
GLfloat fx = v1[0] - v2[2];
GLfloat fy = v1[1] - v2[2];
GLfloat fx = v1[0] - v2[0];
GLfloat fy = v1[1] - v2[1];
GLfloat fz = v1[2] - v2[2];
/* (a,b) = cross(e,f).xy */