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Fix z-test bug

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This commit is contained in:
Miloslav Číž 2019-06-01 18:49:43 +02:00
parent 2371750e24
commit d3e3112fdd
2 changed files with 10 additions and 4 deletions
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12
small3dlib.h
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@ -167,6 +167,10 @@
triangles. */
#endif
#if S3L_PERSPECTIVE_CORRECTION
#define S3L_COMPUTE_DEPTH 1 // PC inevitably computes depth, so enable it
#endif
typedef int32_t S3L_Unit; /**< Units of measurement in 3D space. There is
S3L_FRACTIONS_PER_UNIT in one spatial unit.
By dividing the unit into fractions we
@ -1522,7 +1526,10 @@ void S3L_drawTriangle(
p.x = x;
#if S3L_COMPUTE_DEPTH
#if S3L_PERSPECTIVE_CORRECTION != 1
#if S3L_PERSPECTIVE_CORRECTION == 1
p.depth = (S3L_FRACTIONS_PER_UNIT * S3L_FRACTIONS_PER_UNIT) /
S3L_nonZero(S3L_interpolate(lRecipZ,rRecipZ,x - lX,rX - lX));
#else
p.depth = S3L_getFastLerpValue(depthFLS);
S3L_stepFastLerp(depthFLS);
#endif
@ -1539,9 +1546,6 @@ void S3L_drawTriangle(
#endif
#if S3L_PERSPECTIVE_CORRECTION == 1
p.depth = (S3L_FRACTIONS_PER_UNIT * S3L_FRACTIONS_PER_UNIT) /
S3L_nonZero(S3L_interpolate(lRecipZ,rRecipZ,x - lX,rX - lX));
*barycentric0 =
(
S3L_interpolateFrom0(rOverZ,i,rowLength)

2
testSDL.c
View file

@ -152,6 +152,8 @@ else
setPixel(p->x,p->y,col * 120,dep,(2 - col) * 120);
// setPixel(p->x,p->y, (p->triangleID * 60) % 255, (p->triangleID * 170) % 255, (p->triangleID * 10) % 255 );
//setPixel(p->x,p->y,sss, (p->triangleID * 37) % 255 ,128);
//setPixel(p->x,p->y,p->modelID * 64,p->modelID * 128,255);