williamjcm/small3dlib
1
0
Fork 0
mirror of https://git.coom.tech/drummyfish/small3dlib.git synced 2024-12-23 01:26:19 +01:00
Code Activity

Rename

Browse source
This commit is contained in:
Miloslav Číž 2018-11-18 18:00:02 +01:00
parent 2eff3913f4
commit 02b4e5e079
1 changed files with 15 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
s3l.h
View file

@ -12,12 +12,19 @@
typedef int16_t S3L_Unit;
#define S3L_FRACTIONS_PER_UNIT 1024
typedef int16_t S3L_COORD;
typedef int16_t S3L_ScreenCoord;
typedef struct
{
S3L_COORD x; ///< Screen X coordinate.
S3L_COORD y; ///< Screen Y coordinate.
S3L_Unit x;
S3L_Unit y;
S3L_Unit z;
} S3L_Vec3;
typedef struct
{
S3L_ScreenCoord x; ///< Screen X coordinate.
S3L_ScreenCoord y; ///< Screen Y coordinate.
S3L_Unit barycentric0; /**< Barycentric coord A (corresponds to 1st vertex).
Together with B and C coords these serve to
@ -191,7 +198,7 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
return;
}
S3L_COORD
S3L_ScreenCoord
tPointX, tPointY, // top triangle point coords
lPointX, lPointY, // left triangle point coords
rPointX, rPointY; // right triangle point coords
@ -268,8 +275,8 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
#undef handleLR
S3L_COORD splitY; // Y at which one side (L or R) changes
S3L_COORD endY; // bottom Y of the whole triangle
S3L_ScreenCoord splitY; // Y at which one side (L or R) changes
S3L_ScreenCoord endY; // bottom Y of the whole triangle
int splitOnLeft; // whether split happens on L or R
if (rPointY <= lPointY)
@ -285,7 +292,7 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
endY = rPointY;
}
S3L_COORD currentY = tPointY;
S3L_ScreenCoord currentY = tPointY;
/* We'll be using a slight modification of Bresenham line algorithm (a one
that draws a _non-continous_ line). */
@ -375,7 +382,7 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
S3L_Unit t1 = 0;
S3L_Unit t2 = tMax;
for (S3L_COORD x = lX; x <= rX; ++x)
for (S3L_ScreenCoord x = lX; x <= rX; ++x)
{
*barycentric0 = S3L_interpolateFrom0(rSideUnitPos,t1,tMax);
*barycentric1 = S3L_interpolateFrom0(lSideUnitPos,t2,tMax);