* INTERP_Z - if defined, interpolate integer Z values
* INTERP_RGB - if defined, interpolate integer RGB values
* INTERP_ALPHA - if defined, interpolate integer Alpha values
- * INTERP_INDEX - if defined, interpolate color index values
* INTERP_INT_TEX - if defined, interpolate integer ST texcoords
* (fast, simple 2-D texture mapping, without
* perspective correction)
EdgeT eMaj, eTop, eBot;
GLfloat oneOverArea;
const SWvertex *vMin, *vMid, *vMax; /* Y(vMin)<=Y(vMid)<=Y(vMax) */
- GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceCullSign;
+ GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceSign;
const GLint snapMask = ~((FIXED_ONE / (1 << SUB_PIXEL_BITS)) - 1); /* for x/y coord snapping */
GLfixed vMin_fx, vMin_fy, vMid_fx, vMid_fy, vMax_fx, vMax_fy;
/* compute area, oneOverArea and perform backface culling */
{
const GLfloat area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
- /* Do backface culling */
- if (area * bf < 0.0)
+ if (IS_INF_OR_NAN(area) || area == 0.0F)
return;
- if (IS_INF_OR_NAN(area) || area == 0.0F)
+ if (area * bf * swrast->_BackfaceCullSign < 0.0)
return;
oneOverArea = 1.0F / area;
/* 0 = front, 1 = back */
- span.facing = oneOverArea * swrast->_BackfaceSign > 0.0F;
+ span.facing = oneOverArea * bf > 0.0F;
}
/* Edge setup. For a triangle strip these could be reused... */
{
GLint scan_from_left_to_right; /* true if scanning left-to-right */
-#ifdef INTERP_INDEX
- GLfloat didx, didy;
-#endif
/*
* Execute user-supplied setup code
# endif
}
#endif /* INTERP_RGB */
-#ifdef INTERP_INDEX
- span.interpMask |= SPAN_INDEX;
- if (ctx->Light.ShadeModel == GL_SMOOTH) {
- GLfloat eMaj_di = vMax->attrib[FRAG_ATTRIB_CI][0] - vMin->attrib[FRAG_ATTRIB_CI][0];
- GLfloat eBot_di = vMid->attrib[FRAG_ATTRIB_CI][0] - vMin->attrib[FRAG_ATTRIB_CI][0];
- didx = oneOverArea * (eMaj_di * eBot.dy - eMaj.dy * eBot_di);
- didy = oneOverArea * (eMaj.dx * eBot_di - eMaj_di * eBot.dx);
- span.indexStep = SignedFloatToFixed(didx);
- }
- else {
- span.interpMask |= SPAN_FLAT;
- didx = didy = 0.0F;
- span.indexStep = 0;
- }
-#endif
#ifdef INTERP_INT_TEX
{
GLfloat eMaj_ds = (vMax->attrib[FRAG_ATTRIB_TEX0][0] - vMin->attrib[FRAG_ATTRIB_TEX0][0]) * S_SCALE;
#ifdef INTERP_ALPHA
GLint aLeft = 0, fdaOuter = 0, fdaInner;
#endif
-#ifdef INTERP_INDEX
- GLfixed iLeft=0, diOuter=0, diInner;
-#endif
#ifdef INTERP_INT_TEX
GLfixed sLeft=0, dsOuter=0, dsInner;
GLfixed tLeft=0, dtOuter=0, dtInner;
#endif /* INTERP_RGB */
-#ifdef INTERP_INDEX
- if (ctx->Light.ShadeModel == GL_SMOOTH) {
- iLeft = (GLfixed)(vLower->attrib[FRAG_ATTRIB_CI][0] * FIXED_SCALE
- + didx * adjx + didy * adjy) + FIXED_HALF;
- diOuter = SignedFloatToFixed(didy + dxOuter * didx);
- }
- else {
- ASSERT(ctx->Light.ShadeModel == GL_FLAT);
- iLeft = FloatToFixed(v2->attrib[FRAG_ATTRIB_CI][0]);
- diOuter = 0;
- }
-#endif
#ifdef INTERP_INT_TEX
{
GLfloat s0, t0;
#ifdef INTERP_ALPHA
fdaInner = fdaOuter + span.alphaStep;
#endif
-#ifdef INTERP_INDEX
- diInner = diOuter + span.indexStep;
-#endif
#ifdef INTERP_INT_TEX
dsInner = dsOuter + span.intTexStep[0];
dtInner = dtOuter + span.intTexStep[1];
#ifdef INTERP_ALPHA
span.alpha = aLeft;
#endif
-#ifdef INTERP_INDEX
- span.index = iLeft;
-#endif
#ifdef INTERP_INT_TEX
span.intTex[0] = sLeft;
span.intTex[1] = tLeft;
#endif
#ifdef INTERP_ALPHA
CLAMP_INTERPOLANT(alpha, alphaStep, len);
-#endif
-#ifdef INTERP_INDEX
- CLAMP_INTERPOLANT(index, indexStep, len);
#endif
{
RENDER_SPAN( span );
#ifdef INTERP_ALPHA
aLeft += fdaOuter;
#endif
-#ifdef INTERP_INDEX
- iLeft += diOuter;
-#endif
#ifdef INTERP_INT_TEX
sLeft += dsOuter;
tLeft += dtOuter;
#ifdef INTERP_ALPHA
aLeft += fdaInner;
#endif
-#ifdef INTERP_INDEX
- iLeft += diInner;
-#endif
#ifdef INTERP_INT_TEX
sLeft += dsInner;
tLeft += dtInner;
#undef INTERP_Z
#undef INTERP_RGB
#undef INTERP_ALPHA
-#undef INTERP_INDEX
#undef INTERP_INT_TEX
#undef INTERP_ATTRIBS