williamjcm/small3dlib
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This commit is contained in:
Miloslav Číž 2019-05-10 21:00:48 +02:00
parent 1f0aa51429
commit 438c4d7db3
2 changed files with 51 additions and 35 deletions
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78
s3l.h
View file

@ -116,7 +116,7 @@
#endif
#ifndef S3L_PERSPECTIVE_CORRECTION
#define S3L_PERSPECTIVE_CORRECTION 0
#define S3L_PERSPECTIVE_CORRECTION 1
#endif
#define S3L_HALF_RESOLUTION_X (S3L_RESOLUTION_X >> 1)
@ -847,6 +847,8 @@ void _S3L_drawFilledTriangle(
S3L_Unit *barycentric1; // bar. coord that gets higher from R to L
S3L_Unit *barycentric2; // bar. coord that gets higher from bottom up
printf("-------\n");
// Sort the points.
#define assignPoints(t,a,b)\
@ -948,8 +950,8 @@ void _S3L_drawFilledTriangle(
lErrSub, rErrSub; // error value to substract when moving in x direction
S3L_Unit
lSideUnitStep, rSideUnitStep,
lSideUnitPos, rSideUnitPos;
lSideStep, rSideStep,
lSideUnitPosScaled, rSideUnitPosScaled;
/* init side for the algorithm, params:
s - which side (l or r)
@ -961,13 +963,13 @@ void _S3L_drawFilledTriangle(
s##X = p1##PointSx;\
s##Dx = p2##PointSx - p1##PointSx;\
s##Dy = p2##PointSy - p1##PointSy;\
s##SideUnitStep = (S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY)\
s##SideStep = (S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY)\
/ (s##Dy != 0 ? s##Dy : 1);\
s##SideUnitPos = 0;\
s##SideUnitPosScaled = 0;\
if (!down)\
{\
s##SideUnitPos = S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY;\
s##SideUnitStep *= -1;\
s##SideUnitPosScaled = S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY;\
s##SideStep *= -1;\
}\
s##Inc = s##Dx >= 0 ? 1 : -1;\
if (s##Dx < 0)\
@ -1002,6 +1004,8 @@ void _S3L_drawFilledTriangle(
#if S3L_PERSPECTIVE_CORRECTION == 1
S3L_PerspectiveCorrectionState lPC, rPC, rowPC;
int8_t topPart = 1; // whether drawing top or bottom part of the triangle
initPC(t,l,l)
initPC(t,r,r)
#endif
@ -1017,17 +1021,21 @@ void _S3L_drawFilledTriangle(
S3L_Unit *tmp = barycentric##b0;\
barycentric##b0 = barycentric##b1;\
barycentric##b1 = tmp;\
s##SideUnitPos =\
(S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY) - s##SideUnitPos;\
s##SideUnitStep *= -1;
s##SideUnitPosScaled =\
(S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY) - s##SideUnitPosScaled;\
s##SideStep *= -1;
if (splitOnLeft)
{
initSide(l,l,r,0);
manageSplit(0,2,r)
printf("split L\n");
#if S3L_PERSPECTIVE_CORRECTION == 1
initPC(l,r,l)
initPC(r,t,r)
topPart = 0;
#endif
}
else
@ -1035,8 +1043,12 @@ void _S3L_drawFilledTriangle(
initSide(r,r,l,0);
manageSplit(1,2,l)
printf("split R\n");
#if S3L_PERSPECTIVE_CORRECTION == 1
initPC(r,l,r)
initPC(l,t,l)
topPart = 0;
#endif
}
}
@ -1050,22 +1062,17 @@ void _S3L_drawFilledTriangle(
S3L_Unit rowLength = S3L_nonZero(rX - lX - 1); // prevent zero div
S3L_Unit b0 = 0;
S3L_Unit b1 = lSideUnitPos;
S3L_Unit b0Step = rSideUnitPos / rowLength;
S3L_Unit b1Step = lSideUnitPos / rowLength;
#if S3L_PERSPECTIVE_CORRECTION == 1
S3L_Unit lDepth, rDepth, lT, rT;
lT = lSideUnitPos >> S3L_LERP_QUALITY; // CHANGEEEE
rT = rSideUnitPos >> S3L_LERP_QUALITY; // CHANGEEEE
lT = S3L_correctPerspective(lSideUnitPosScaled >> S3L_LERP_QUALITY,&lPC);
rT = S3L_correctPerspective(rSideUnitPosScaled >> S3L_LERP_QUALITY,&rPC);
rT = S3L_correctPerspective(rT,&rPC);
lDepth = S3L_interpolateByUnit(lPC.a[2],lPC.b[2],lT);
rDepth = S3L_interpolateByUnit(rPC.a[2],rPC.b[2],rT);
lDepth = S3L_interpolateByUnit(lPC.p0[2],lPC.p1[2],lT);
rDepth = S3L_interpolateByUnit(rPC.p0[2],rPC.p1[2],rT);
printf("l: %d %d\n",lSideUnitPosScaled >> S3L_LERP_QUALITY,lT);
printf("r: %d %d\n",rSideUnitPosScaled >> S3L_LERP_QUALITY,rT);
S3L_initPerspectiveCorrectionState(
S3L_interpolateByUnit(lPC.a[0],lPC.b[0],lT),
@ -1077,31 +1084,40 @@ void _S3L_drawFilledTriangle(
camera->focalLength,
&rowPC
);
#else
S3L_Unit b0 = 0;
S3L_Unit b1 = lSideUnitPosScaled;
S3L_Unit b0Step = rSideUnitPosScaled / rowLength;
S3L_Unit b1Step = lSideUnitPosScaled / rowLength;
#endif
for (S3L_ScreenCoord x = lX; x < rX; ++x)
{
#if S3L_PERSPECTIVE_CORRECTION == 1
S3L_Unit rowT =
S3L_correctPerspective(S3L_interpolateFrom0(S3L_FRACTIONS_PER_UNIT,
x - lX,rowLength),&rowPC);
*barycentric0 = S3L_interpolateByUnitFrom0(lT,rowT);
*barycentric1 = S3L_FRACTIONS_PER_UNIT -
S3L_interpolateByUnitFrom0(S3L_FRACTIONS_PER_UNIT - rT,S3L_FRACTIONS_PER_UNIT - rowT);
#else
*barycentric0 = b0 >> S3L_LERP_QUALITY;
*barycentric1 = b1 >> S3L_LERP_QUALITY;
#if S3L_PERSPECTIVE_CORRECTION == 1
S3L_Unit rowT = S3L_interpolateFrom0(S3L_FRACTIONS_PER_UNIT,x - lX,rX - lX);
*barycentric0 = S3L_interpolateByUnitFrom0(lT,rowT);
*barycentric1 = S3L_interpolateByUnitFrom0(rT,S3L_FRACTIONS_PER_UNIT - rowT);
b0 += b0Step;
b1 -= b1Step;
#endif
*barycentric2 = S3L_FRACTIONS_PER_UNIT - *barycentric0 - *barycentric1;
p->x = x;
S3L_PIXEL_FUNCTION(p);
b0 += b0Step;
b1 -= b1Step;
}
lSideUnitPos += lSideUnitStep;
rSideUnitPos += rSideUnitStep;
lSideUnitPosScaled += lSideStep;
rSideUnitPosScaled += rSideStep;
++currentY;
}

8
testSDL.c
View file

@ -119,11 +119,11 @@ void draw()
//frame = 853;
modelTransform.rotation.z = frame * 0.1;
modelTransform.rotation.x = frame * 0.3;
modelTransform.rotation.z = 30;//frame * 0.1;
modelTransform.rotation.x = 90;//frame * 0.3;
S3L_drawModelIndexed(ver,tri,12,modelTransform,&camera,&conf);
// S3L_drawModelIndexed(ver,tri + 3,1,modelTransform,&camera,&conf);
// S3L_drawModelIndexed(ver,tri,12,modelTransform,&camera,&conf);
S3L_drawModelIndexed(ver,tri + 3,1,modelTransform,&camera,&conf);
/*
conf.backfaceCulling = S3L_BACKFACE_CULLING_NONE;