williamjcm/small3dlib
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Continue triangle

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This commit is contained in:
Miloslav Číž 2018-11-17 16:40:44 +01:00
parent 15c28205ac
commit 9cbe9a0823
2 changed files with 30 additions and 8 deletions
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4
s3l.h
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@ -193,7 +193,7 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2
v##Dx = p2##PointX - p1##PointX;\
v##Dy = p2##PointY - p1##PointY;\
v##Inc = v##Dx >= 0 ? 1 : -1;\
v##Err = 2 * v##Dx - v##Dy;\
v##Err = 2 * v##Dx - v##Dy; \
v##ErrAdd = 2 * S3L_abs(v##Dx);\
v##ErrSub = 2 * S3L_abs(v##Dy);
@ -214,6 +214,8 @@ void S3L_drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2
{
p.y = currentY;
// draw the line
for (S3L_COORD x = lX; x <= rX; ++x)
{
p.x = x;

34
testSDL.c
View file

@ -21,30 +21,50 @@ void clearScreen()
static inline void setPixel(int x, int y, uint8_t red, uint8_t green, uint8_t blue)
{
uint32_t r = red & 0x000000FF;
r = r << 16;
r = r << 24;
uint32_t g = green & 0x000000FF;
g = g << 8;
g = g << 16;
uint32_t b = blue & 0x000000FF;
b = b << 8;
pixels[y * SCREEN_WIDTH + x] = r | g | b;
}
void drawPixel(S3L_PixelInfo *p)
{
setPixel(p->x,p->y,255,255,0);
setPixel(p->x,p->y,255,255,255);
}
const int16_t test_coords[] =
{
100,100, 99,101, 101,101, // 0, small triangle
90,50, 100,10, 300,80, // 1, arbitrary
100,30, 20,50, 40,80 // 2, arbitrary
};
void draw()
{
clearScreen();
setPixel(90,50,255,0,0);
setPixel(100,10,255,0,0);
setPixel(300,80,255,0,0);
int c = 0;
S3L_drawTriangle(90,50,100,10,300,80);
int
x0 = test_coords[6 * c],
y0 = test_coords[6 * c + 1],
x1 = test_coords[6 * c + 2],
y1 = test_coords[6 * c + 3],
x2 = test_coords[6 * c + 4],
y2 = test_coords[6 * c + 5];
S3L_drawTriangle(x0,y0,x1,y1,x2,y2);
/*
setPixel(x0,y0,255,0,0);
setPixel(x1,y1,255,0,0);
setPixel(x2,y2,255,0,0);
*/
}
int main()