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Fix crash in book/stencil.

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Allow drivers to perform the perspective divide themselves.  Assembly
to do cliptesting without perspective divide for size-4 vectors.
This commit is contained in:
Keith Whitwell
2001-01-13 05:48:25 +00:00
parent a087c7421b
commit 321f67c472
13 changed files with 334 additions and 82 deletions
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60
src/mesa/math/m_clip_tmp.h
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@@ -1,4 +1,4 @@
/* $Id: m_clip_tmp.h,v 1.2 2000/12/26 05:09:31 keithw Exp $ */
/* $Id: m_clip_tmp.h,v 1.3 2001/01/13 05:48:25 keithw Exp $ */
/*
* Mesa 3-D graphics library
@@ -100,6 +100,59 @@ static GLvector4f * _XFORMAPI TAG(cliptest_points4)( GLvector4f *clip_vec,
return proj_vec;
}
static GLvector4f * _XFORMAPI TAG(cliptest_np_points4)( GLvector4f *clip_vec,
GLvector4f *proj_vec,
GLubyte clipMask[],
GLubyte *orMask,
GLubyte *andMask )
{
const GLuint stride = clip_vec->stride;
const GLfloat *from = (GLfloat *)clip_vec->start;
const GLuint count = clip_vec->count;
GLuint c = 0;
GLubyte tmpAndMask = *andMask;
GLubyte tmpOrMask = *orMask;
GLuint i;
STRIDE_LOOP {
const GLfloat cx = from[0];
const GLfloat cy = from[1];
const GLfloat cz = from[2];
const GLfloat cw = from[3];
#if defined(macintosh)
/* on powerpc cliptest is 17% faster in this way. */
GLuint mask;
mask = (((cw < cx) << CLIP_RIGHT_SHIFT));
mask |= (((cw < -cx) << CLIP_LEFT_SHIFT));
mask |= (((cw < cy) << CLIP_TOP_SHIFT));
mask |= (((cw < -cy) << CLIP_BOTTOM_SHIFT));
mask |= (((cw < cz) << CLIP_FAR_SHIFT));
mask |= (((cw < -cz) << CLIP_NEAR_SHIFT));
#else /* !defined(macintosh)) */
GLubyte mask = 0;
if (-cx + cw < 0) mask |= CLIP_RIGHT_BIT;
if ( cx + cw < 0) mask |= CLIP_LEFT_BIT;
if (-cy + cw < 0) mask |= CLIP_TOP_BIT;
if ( cy + cw < 0) mask |= CLIP_BOTTOM_BIT;
if (-cz + cw < 0) mask |= CLIP_FAR_BIT;
if ( cz + cw < 0) mask |= CLIP_NEAR_BIT;
#endif /* defined(macintosh) */
clipMask[i] = mask;
if (mask) {
c++;
tmpAndMask &= mask;
tmpOrMask |= mask;
}
}
*orMask = tmpOrMask;
*andMask = (GLubyte) (c < count ? 0 : tmpAndMask);
return clip_vec;
}
static GLvector4f * _XFORMAPI TAG(cliptest_points3)( GLvector4f *clip_vec,
GLvector4f *proj_vec,
GLubyte clipMask[],
@@ -132,6 +185,7 @@ static GLvector4f * _XFORMAPI TAG(cliptest_points3)( GLvector4f *clip_vec,
return clip_vec;
}
static GLvector4f * _XFORMAPI TAG(cliptest_points2)( GLvector4f *clip_vec,
GLvector4f *proj_vec,
GLubyte clipMask[],
@@ -168,4 +222,8 @@ static void TAG(init_c_cliptest)( void )
gl_clip_tab[4] = TAG(cliptest_points4);
gl_clip_tab[3] = TAG(cliptest_points3);
gl_clip_tab[2] = TAG(cliptest_points2);
gl_clip_np_tab[4] = TAG(cliptest_np_points4);
gl_clip_np_tab[3] = TAG(cliptest_points3);
gl_clip_np_tab[2] = TAG(cliptest_points2);
}