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Remove discontinity conditions

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This commit is contained in:
Miloslav Číž 2019-05-04 00:24:05 +02:00
parent e0aa1e6661
commit b77fbb38b2
1 changed files with 2 additions and 14 deletions
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16
s3l.h
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@ -813,10 +813,6 @@ void S3L_drawTriangle(
initSide(r,t,r,1)
initSide(l,t,l,1)
S3L_Unit xFrom_prev = tPointX; // helper vars, hold previous values of xFrom
S3L_Unit xTo_prev = tPointX; // and xTo (declared later) to prevent
// discontinuities
while (currentY <= endY) // draw the triangle from top to bottom
{
if (currentY == splitY) // reached a vertical split of the triangle?
@ -849,18 +845,13 @@ void S3L_drawTriangle(
// draw the horizontal line
S3L_Unit xFrom = lX < (xTo_prev + 1) ? lX : (xTo_prev + 1);
S3L_Unit xTo = rX > (xFrom_prev - 1) ? rX : (xFrom_prev - 1);
/* ^ these conditions prevent discontinuities when drawing
"long" triangles (thinner than 1 px) */
S3L_Unit tMax = xTo - xFrom;
S3L_Unit tMax = rX - lX;
tMax = S3L_NONZERO(tMax); // prevent division by zero
S3L_Unit t1 = 0;
S3L_Unit t2 = tMax;
for (S3L_ScreenCoord x = xFrom; x <= xTo; ++x)
for (S3L_ScreenCoord x = lX; x <= rX; ++x)
{
*barycentric0 = S3L_interpolateFrom0(rSideUnitPos,t1,tMax);
*barycentric1 = S3L_interpolateFrom0(lSideUnitPos,t2,tMax);
@ -879,9 +870,6 @@ void S3L_drawTriangle(
lSideUnitPos += lSideUnitStep;
rSideUnitPos += rSideUnitStep;
xFrom_prev = xFrom;
xTo_prev = xTo;
++currentY;
}