williamjcm/small3dlib
1
0
Fork 0
mirror of https://git.coom.tech/drummyfish/small3dlib.git synced 2024-11-21 20:39:57 +01:00
Code Activity

Remove discontinity conditions

Browse source
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
Show stats Download patch file Download diff file Expand all files Collapse all files

16
s3l.h
View file

@ -813,10 +813,6 @@ void S3L_drawTriangle(
initSide(r,t,r,1) initSide(r,t,r,1)
initSide(l,t,l,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 while (currentY <= endY) // draw the triangle from top to bottom
{ {
if (currentY == splitY) // reached a vertical split of the triangle? if (currentY == splitY) // reached a vertical split of the triangle?
@ -849,18 +845,13 @@ void S3L_drawTriangle(
// draw the horizontal line // draw the horizontal line
S3L_Unit xFrom = lX < (xTo_prev + 1) ? lX : (xTo_prev + 1); S3L_Unit tMax = rX - lX;
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;
tMax = S3L_NONZERO(tMax); // prevent division by zero tMax = S3L_NONZERO(tMax); // prevent division by zero
S3L_Unit t1 = 0; S3L_Unit t1 = 0;
S3L_Unit t2 = tMax; 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); *barycentric0 = S3L_interpolateFrom0(rSideUnitPos,t1,tMax);
*barycentric1 = S3L_interpolateFrom0(lSideUnitPos,t2,tMax); *barycentric1 = S3L_interpolateFrom0(lSideUnitPos,t2,tMax);
@ -879,9 +870,6 @@ void S3L_drawTriangle(
lSideUnitPos += lSideUnitStep; lSideUnitPos += lSideUnitStep;
rSideUnitPos += rSideUnitStep; rSideUnitPos += rSideUnitStep;
xFrom_prev = xFrom;
xTo_prev = xTo;
++currentY; ++currentY;
} }