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

Add early clipping

Browse source
This commit is contained in:
Miloslav Číž 2019-05-12 00:11:14 +02:00
parent 509ebce56c
commit f7a8cc8f63
1 changed files with 21 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
s3l.h
View file

@ -150,6 +150,14 @@ typedef int32_t S3L_Unit; /**< Units of measurement in 3D space. There is
it will overflow. Also other things it will overflow. Also other things
may overflow, so rather don't do it. */ may overflow, so rather don't do it. */
#define S3L_PROJECTION_PLANE_HEIGHT\
((S3L_RESOLUTION_Y * S3L_FRACTIONS_PER_UNIT * 2) / S3L_RESOLUTION_X)
#ifndef S3L_NEAR
#define S3L_NEAR (S3L_FRACTIONS_PER_UNIT) /**< Distance of the near clipping
plane. */
#endif
#ifndef S3L_LERP_QUALITY #ifndef S3L_LERP_QUALITY
#define S3L_LERP_QUALITY 8 /**< Quality (scaling) of SOME linear #define S3L_LERP_QUALITY 8 /**< Quality (scaling) of SOME linear
interpolations. 0 will most likely be faster, interpolations. 0 will most likely be faster,
@ -1164,6 +1172,8 @@ void _S3L_drawFilledTriangle(
#undef stepSide #undef stepSide
} }
int a = 0;
/** /**
Draws a triangle according to given config. The vertices are specified in Draws a triangle according to given config. The vertices are specified in
projection-plane space (NOT screen space!) -- they wll be mapped to screen projection-plane space (NOT screen space!) -- they wll be mapped to screen
@ -1175,7 +1185,17 @@ void S3L_drawTriangle(S3L_Vec4 point0, S3L_Vec4 point1, S3L_Vec4 point2,
const S3L_DrawConfig *config, const S3L_Camera *camera, const S3L_DrawConfig *config, const S3L_Camera *camera,
S3L_Index triangleID) S3L_Index triangleID)
{ {
if (point0.z <= 0 && point1.z <= 0 && point2.z <= 0) #define clipTest(c,cmp,v)\
(point0.c cmp (v) && point1.c cmp (v) && point2.c cmp (v))
if ( // early clipping -- test if completely outside frustum
clipTest(z,<=,S3L_NEAR) ||
clipTest(x,<,-1 * S3L_FRACTIONS_PER_UNIT) ||
clipTest(x,>,S3L_FRACTIONS_PER_UNIT) ||
clipTest(y,<,-1 * S3L_PROJECTION_PLANE_HEIGHT / 2) ||
clipTest(y,>,S3L_PROJECTION_PLANE_HEIGHT / 2)
)
return; // completely behind the camera return; // completely behind the camera
if (config->backfaceCulling != S3L_BACKFACE_CULLING_NONE) if (config->backfaceCulling != S3L_BACKFACE_CULLING_NONE)