(void) swrast;
- INIT_SPAN(span, GL_POLYGON, 0, 0, 0);
+ INIT_SPAN(span, GL_POLYGON);
span.y = 0; /* silence warnings */
#ifdef INTERP_Z
/* 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)
- return;
if (IS_INF_OR_NAN(area) || area == 0.0F)
return;
- oneOverArea = 1.0F / area;
- }
+ if (area * bf * swrast->_BackfaceCullSign < 0.0)
+ return;
+ oneOverArea = 1.0F / area;
- span.facing = ctx->_Facing; /* for 2-sided stencil test */
+ /* 0 = front, 1 = back */
+ span.facing = oneOverArea * bf > 0.0F;
+ }
/* Edge setup. For a triangle strip these could be reused... */
{
span.greenStep = 0;
span.blueStep = 0;
# ifdef INTERP_ALPHA
- span.attrStepX[FRAG_ATTRIB_COL0][3] = span.attrStepX[FRAG_ATTRIB_COL0][3] = 0.0F;
+ span.attrStepX[FRAG_ATTRIB_COL0][3] = span.attrStepY[FRAG_ATTRIB_COL0][3] = 0.0F;
span.alphaStep = 0;
# endif
}