williamjcm/small3dlib
1
0
Fork 0
mirror of https://git.coom.tech/drummyfish/small3dlib.git synced 2024-11-20 20:29:58 +01:00
Code Activity

Rename constant

Browse source
This commit is contained in:
Miloslav Číž 2019-05-17 18:31:13 +02:00
parent f3817882b0
commit c0e5c383a8
2 changed files with 23 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

39
s3l.h
View file

@ -158,14 +158,15 @@ typedef int32_t S3L_Unit; /**< Units of measurement in 3D space. There is
plane. */
#endif
#ifndef S3L_LERP_QUALITY
#define S3L_LERP_QUALITY 8 /**< Quality (scaling) of SOME linear
interpolations. 0 will most likely be faster,
but artifacts can occur for bigger tris,
while higher values can fix this -- in theory
all higher values will have the same speed
(it is a shift value), but it mustn't be too
high to prevent overflow. */
#ifndef S3L_FAST_LERP_QUALITY
#define S3L_FAST_LERP_QUALITY 8 /**< Quality (scaling) of SOME linear
interpolations. 0 will most likely be
faster, but artifacts can occur for
bigger tris, while higher values can fix
this -- in theory all higher values will
have the same speed (it is a shift
value), but it mustn't be too high to
prevent overflow. */
#endif
/** Predefined vertices of a cube to simply insert in an array. These come with
@ -382,6 +383,7 @@ void S3L_vec3Xmat4(S3L_Vec4 *v, S3L_Mat4 *m)
{
S3L_Vec4 vBackup;
#undef dotCol
#define dotCol(col)\
(vBackup.x * (*m)[col][0]) / S3L_FRACTIONS_PER_UNIT +\
(vBackup.y * (*m)[col][1]) / S3L_FRACTIONS_PER_UNIT +\
@ -1002,7 +1004,7 @@ void _S3L_drawFilledTriangle(
lSideStep, rSideStep, lSideUnitPosScaled, rSideUnitPosScaled;
/* ^ These are helper vars for faster linear iterpolation (we scale the
S3L_FRACTIONS_PER_UNIT up by shifting to the right by
S3L_LERP_QUALITY and simply increment by steps. */
S3L_FAST_LERP_QUALITY and simply increment by steps. */
/* init side for the algorithm, params:
s - which side (l or r)
@ -1013,12 +1015,12 @@ void _S3L_drawFilledTriangle(
s##X = p1##PointSx;\
s##Dx = p2##PointSx - p1##PointSx;\
s##Dy = p2##PointSy - p1##PointSy;\
s##SideStep = (S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY)\
s##SideStep = (S3L_FRACTIONS_PER_UNIT << S3L_FAST_LERP_QUALITY)\
/ (s##Dy != 0 ? s##Dy : 1);\
s##SideUnitPosScaled = 0;\
if (!down)\
{\
s##SideUnitPosScaled = S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY;\
s##SideUnitPosScaled = S3L_FRACTIONS_PER_UNIT << S3L_FAST_LERP_QUALITY;\
s##SideStep *= -1;\
}\
s##Inc = s##Dx >= 0 ? 1 : -1;\
@ -1077,8 +1079,8 @@ void _S3L_drawFilledTriangle(
S3L_Unit *tmp = barycentric##b0;\
barycentric##b0 = barycentric##b1;\
barycentric##b1 = tmp;\
s##SideUnitPosScaled =\
(S3L_FRACTIONS_PER_UNIT << S3L_LERP_QUALITY) - s##SideUnitPosScaled;\
s##SideUnitPosScaled = (S3L_FRACTIONS_PER_UNIT\
<< S3L_FAST_LERP_QUALITY) - s##SideUnitPosScaled;\
s##SideStep *= -1;
if (splitOnLeft)
@ -1120,8 +1122,11 @@ void _S3L_drawFilledTriangle(
lDepth, rDepth,
lT, rT; // perspective-corrected position along either side
lT = S3L_correctPerspective(lSideUnitPosScaled >> S3L_LERP_QUALITY,&lPC);
rT = S3L_correctPerspective(rSideUnitPosScaled >> S3L_LERP_QUALITY,&rPC);
lT = S3L_correctPerspective(lSideUnitPosScaled >> S3L_FAST_LERP_QUALITY,
&lPC);
rT = S3L_correctPerspective(rSideUnitPosScaled >> S3L_FAST_LERP_QUALITY,
&rPC);
lDepth = S3L_interpolateByUnit(lPC.a[2],lPC.b[2],lT);
rDepth = S3L_interpolateByUnit(rPC.a[2],rPC.b[2],rT);
@ -1172,8 +1177,8 @@ void _S3L_drawFilledTriangle(
*barycentric0 = S3L_interpolateByUnitFrom0(rT,rowT);
*barycentric1 = S3L_interpolateByUnit(lT,0,rowT);
#else
*barycentric0 = b0 >> S3L_LERP_QUALITY;
*barycentric1 = b1 >> S3L_LERP_QUALITY;
*barycentric0 = b0 >> S3L_FAST_LERP_QUALITY;
*barycentric1 = b1 >> S3L_FAST_LERP_QUALITY;
b0 += b0Step;
b1 -= b1Step;

2
testSDL.c
View file

@ -12,7 +12,7 @@
#define S3L_RESOLUTION_X 640
#define S3L_RESOLUTION_Y 480
#define S3L_PERSPECTIVE_CORRECTION 1
#define S3L_PERSPECTIVE_CORRECTION 0
#include "s3l.h"