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Move triangle code to the top

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This commit is contained in:
Miloslav Číž 2019-05-04 21:05:42 +02:00
parent cf7b6494f8
commit 55ebaef41c
1 changed files with 235 additions and 244 deletions
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93
s3l.h
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@ -634,58 +634,8 @@ void S3L_drawTriangle(
S3L_initPixelInfo(&p); S3L_initPixelInfo(&p);
p.triangleID = triangleID; p.triangleID = triangleID;
// point mode if (config.mode == S3L_MODE_TRIANGLES) // triangle mode
if (config.mode == S3L_MODE_POINTS)
{ {
p.x = x0; p.y = y0; p.barycentric0 = S3L_FRACTIONS_PER_UNIT;
p.barycentric1 = 0; p.barycentric2 = 0;
S3L_PIXEL_FUNCTION(&p);
p.x = x1; p.y = y1; p.barycentric0 = 0;
p.barycentric1 = S3L_FRACTIONS_PER_UNIT; p.barycentric2 = 0;
S3L_PIXEL_FUNCTION(&p);
p.x = x2; p.y = y2; p.barycentric0 = 0;
p.barycentric1 = 0; p.barycentric2 = S3L_FRACTIONS_PER_UNIT;
S3L_PIXEL_FUNCTION(&p);
return;
}
// line mode
if (config.mode == S3L_MODE_LINES)
{
S3L_BresenhamState line;
S3L_Unit lineLen;
#define drawLine(p1,p2)\
S3L_bresenhamInit(&line,x##p1,y##p1,x##p2,y##p2);\
p.barycentric0 = 0;\
p.barycentric1 = 0;\
p.barycentric2 = 0;\
lineLen = S3L_nonZero(line.steps);\
do\
{\
p.x = line.x; p.y = line.y;\
p.barycentric##p1 = S3L_interpolateFrom0(\
S3L_FRACTIONS_PER_UNIT,line.steps,lineLen); \
p.barycentric##p2 = S3L_FRACTIONS_PER_UNIT - p.barycentric##p1;\
S3L_PIXEL_FUNCTION(&p);\
} while (S3L_bresenhamStep(&line));
drawLine(0,1)
drawLine(2,0)
drawLine(1,2)
#undef drawLine
return;
}
// triangle mode -- TODO: maybe move to the top as this is most common?
S3L_ScreenCoord S3L_ScreenCoord
tPointX, tPointY, // top triangle point coords tPointX, tPointY, // top triangle point coords
lPointX, lPointY, // left triangle point coords lPointX, lPointY, // left triangle point coords
@ -909,6 +859,47 @@ void S3L_drawTriangle(
#undef initSide #undef initSide
#undef stepSide #undef stepSide
}
else if (config.mode == S3L_MODE_LINES) // line mode
{
S3L_BresenhamState line;
S3L_Unit lineLen;
#define drawLine(p1,p2)\
S3L_bresenhamInit(&line,x##p1,y##p1,x##p2,y##p2);\
p.barycentric0 = 0;\
p.barycentric1 = 0;\
p.barycentric2 = 0;\
lineLen = S3L_nonZero(line.steps);\
do\
{\
p.x = line.x; p.y = line.y;\
p.barycentric##p1 = S3L_interpolateFrom0(\
S3L_FRACTIONS_PER_UNIT,line.steps,lineLen); \
p.barycentric##p2 = S3L_FRACTIONS_PER_UNIT - p.barycentric##p1;\
S3L_PIXEL_FUNCTION(&p);\
} while (S3L_bresenhamStep(&line));
drawLine(0,1)
drawLine(2,0)
drawLine(1,2)
#undef drawLine
}
else // point mode
{
p.x = x0; p.y = y0; p.barycentric0 = S3L_FRACTIONS_PER_UNIT;
p.barycentric1 = 0; p.barycentric2 = 0;
S3L_PIXEL_FUNCTION(&p);
p.x = x1; p.y = y1; p.barycentric0 = 0;
p.barycentric1 = S3L_FRACTIONS_PER_UNIT; p.barycentric2 = 0;
S3L_PIXEL_FUNCTION(&p);
p.x = x2; p.y = y2; p.barycentric0 = 0;
p.barycentric1 = 0; p.barycentric2 = S3L_FRACTIONS_PER_UNIT;
S3L_PIXEL_FUNCTION(&p);
}
} }
static inline void S3L_rotate2DPoint(S3L_Unit *x, S3L_Unit *y, S3L_Unit angle) static inline void S3L_rotate2DPoint(S3L_Unit *x, S3L_Unit *y, S3L_Unit angle)