williamjcm/small3dlib
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Fix a bug

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This commit is contained in:
Miloslav Číž 2018-11-17 17:18:55 +01:00
parent 9cbe9a0823
commit d20eaa1427
2 changed files with 26 additions and 20 deletions
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10
s3l.h
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@ -188,14 +188,18 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2
lErrAdd, rErrAdd, // error value to add in each Bresenham cycle lErrAdd, rErrAdd, // error value to add in each Bresenham cycle
lErrSub, rErrSub; // error value to substract when moving in x direction lErrSub, rErrSub; // error value to substract when moving in x direction
int16_t helperDxAbs, helperDyAbs;
#define initSide(v,p1,p2)\ #define initSide(v,p1,p2)\
v##X = p1##PointX;\ v##X = p1##PointX;\
v##Dx = p2##PointX - p1##PointX;\ v##Dx = p2##PointX - p1##PointX;\
v##Dy = p2##PointY - p1##PointY;\ v##Dy = p2##PointY - p1##PointY;\
helperDxAbs = S3L_abs(v##Dx);\
helperDyAbs = S3L_abs(v##Dy);\
v##Inc = v##Dx >= 0 ? 1 : -1;\ v##Inc = v##Dx >= 0 ? 1 : -1;\
v##Err = 2 * v##Dx - v##Dy; \ v##Err = 2 * helperDxAbs - helperDyAbs;\
v##ErrAdd = 2 * S3L_abs(v##Dx);\ v##ErrAdd = 2 * helperDxAbs;\
v##ErrSub = 2 * S3L_abs(v##Dy); v##ErrSub = 2 * helperDyAbs;
#define stepSide(s)\ #define stepSide(s)\
while (s##Err > 0)\ while (s##Err > 0)\

14
testSDL.c
View file

@ -40,16 +40,19 @@ void drawPixel(S3L_PixelInfo *p)
const int16_t test_coords[] = const int16_t test_coords[] =
{ {
100,100, 99,101, 101,101, // 0, small triangle 100,100, 99,101, 101,101, // 0, small triangle
90,50, 100,10, 300,80, // 1, arbitrary 190,50, 200,10, 400,80, // 1, arbitrary
100,30, 20,50, 40,80 // 2, arbitrary 40,80, 20,50, 100,30, // 2, arbitrary
300,300, 290,400, 310,400, // 3, regular
105,300, 120,300, 201,300, // 4, horizontal line
400,300, 400,320, 400,400 // 5, vertical line
}; };
void draw() void draw()
{ {
clearScreen(); clearScreen();
int c = 0; for (int c = 0; c < 4; ++c)
{
int int
x0 = test_coords[6 * c], x0 = test_coords[6 * c],
y0 = test_coords[6 * c + 1], y0 = test_coords[6 * c + 1],
@ -60,11 +63,10 @@ int c = 0;
S3L_drawTriangle(x0,y0,x1,y1,x2,y2); S3L_drawTriangle(x0,y0,x1,y1,x2,y2);
/*
setPixel(x0,y0,255,0,0); setPixel(x0,y0,255,0,0);
setPixel(x1,y1,255,0,0); setPixel(x1,y1,255,0,0);
setPixel(x2,y2,255,0,0); setPixel(x2,y2,255,0,0);
*/ }
} }
int main() int main()