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Triangle rendering functions.

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Joshua Sigona 3 years ago
parent f4c07e505c
commit 15ca32fac1
2 changed files with 222 additions and 4 deletions
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  1. 2
      src/sig/Panel.java
  2. 224
      src/sig/RenderKernel.java

2
src/sig/Panel.java
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@ -39,7 +39,7 @@ public class Panel extends JPanel implements Runnable {
}
public void init(){
triPoints = new float[12*1000000];
triPoints = new float[12*5000];
cm = getCompatibleColorModel();
width = getWidth();
height = getHeight();

224
src/sig/RenderKernel.java
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@ -25,9 +25,227 @@ public class RenderKernel extends Kernel{
int y2=(int)tris[id*12+5];
int x3=(int)tris[id*12+8];
int y3=(int)tris[id*12+9];
if (x1>=0&&x1<width&&y1>=0&&y1<height) {pixels[y1*width+x1]=0xFF;}
if (x2>=0&&x2<width&&y2>=0&&y2<height) {pixels[y2*width+x2]=0xFF00;}
if (x3>=0&&x3<width&&y3>=0&&y3<height) {pixels[y3*width+x3]=0xFF0000;}
FillTriangle(x1,y1,x2,y2,x3,y3,0xFF0000);
}
void DrawHorizontalLine(int sx,int ex,int ny,int col) {
for (int i=sx;i<=ex;i++) {
Draw(i,ny,col);
}
}
void FillTriangle(int x1, int y1, int x2, int y2, int x3, int y3, int col)
{
int t1x=0, t2x=0, y=0, minx=0, maxx=0, t1xp=0, t2xp=0;
boolean changed1 = false;
boolean changed2 = false;
int signx1=0, signx2=0, dx1=0, dy1=0, dx2=0, dy2=0;
int e1=0, e2=0;
// Sort vertices
if (y1>y2) {int t=y1;y1=y2;y2=t;t=x1;x1=x2;x2=t;}
if (y1>y3) {int t=y1;y1=y3;y3=t;t=x1;x1=x3;x3=t;}
if (y2>y3) {int t=y2;y2=y3;y3=t;t=x2;x2=x3;x3=t;}
t1x = t2x = x1; y = y1; // Starting points
dx1 = (int)(x2 - x1); if (dx1<0) { dx1 = -dx1; signx1 = -1; }
else signx1 = 1;
dy1 = (int)(y2 - y1);
dx2 = (int)(x3 - x1); if (dx2<0) { dx2 = -dx2; signx2 = -1; }
else signx2 = 1;
dy2 = (int)(y3 - y1);
if (dy1 > dx1) { // swap values
int t=dx1;dx1=dy1;dy1=t;
changed1 = true;
}
if (dy2 > dx2) { // swap values
int t=dy2;dy2=dx2;dx2=t;
changed2 = true;
}
e2 = (int)(dx2 >> 1);
// Flat top, just process the second half
boolean goNext=false;
if (y1 == y2) goNext=true;
if (!goNext) {
e1 = (int)(dx1 >> 1);
boolean lloopDone=false;
for (int i = 0; i < dx1&&!lloopDone;) {
t1xp = 0; t2xp = 0;
if (t1x<t2x) { minx = t1x; maxx = t2x; }
else { minx = t2x; maxx = t1x; }
// process first line until y value is about to change
boolean loopDone=false;
while (i<dx1&&!loopDone) {
i++;
e1 += dy1;
while (e1 >= dx1) {
e1 -= dx1;
if (changed1) t1xp = signx1;//t1x += signx1;
else loopDone=true;
}
if (changed1) loopDone=true;
else t1x += signx1;
}
// Move line
// process second line until y value is about to change
loopDone=false;
while (!loopDone) {
e2 += dy2;
while (e2 >= dx2) {
e2 -= dx2;
if (changed2) t2xp = signx2;//t2x += signx2;
else loopDone=true;
}
if (changed2) loopDone=true;
else t2x += signx2;
}
if (minx>t1x) minx = t1x; if (minx>t2x) minx = t2x;
if (maxx<t1x) maxx = t1x; if (maxx<t2x) maxx = t2x;
DrawHorizontalLine(minx, maxx, y,col); // Draw line from min to max points found on the y
// Now increase y
if (!changed1) t1x += signx1;
t1x += t1xp;
if (!changed2) t2x += signx2;
t2x += t2xp;
y += 1;
if (y == y2) lloopDone=true;
}
}
// Second half
dx1 = (int)(x3 - x2); if (dx1<0) { dx1 = -dx1; signx1 = -1; }
else signx1 = 1;
dy1 = (int)(y3 - y2);
t1x = x2;
if (dy1 > dx1) { // swap values
int t=dy1;dy1=dx1;dx1=t;
changed1 = true;
}
else changed1 = false;
e1 = (int)(dx1 >> 1);
boolean lloopDone=false;
for (int i = 0; i <= dx1&&!lloopDone; i++) {
t1xp = 0; t2xp = 0;
if (t1x<t2x) { minx = t1x; maxx = t2x; }
else { minx = t2x; maxx = t1x; }
// process first line until y value is about to change
boolean loopDone=false;
while (i<dx1&&!loopDone) {
e1 += dy1;
while (e1 >= dx1) {
e1 -= dx1;
if (changed1) { t1xp = signx1; loopDone=true;}//t1x += signx1;
else loopDone=true;
}
if (changed1) loopDone=true;
else t1x += signx1;
if (i<dx1) i++;
}
// process second line until y value is about to change
loopDone=false;
while (t2x != x3&&!loopDone) {
e2 += dy2;
while (e2 >= dx2) {
e2 -= dx2;
if (changed2) t2xp = signx2;
else loopDone=true;
}
if (changed2) loopDone=true;
else t2x += signx2;
}
if (minx>t1x) minx = t1x; if (minx>t2x) minx = t2x;
if (maxx<t1x) maxx = t1x; if (maxx<t2x) maxx = t2x;
DrawHorizontalLine(minx, maxx, y,col);
if (!changed1) t1x += signx1;
t1x += t1xp;
if (!changed2) t2x += signx2;
t2x += t2xp;
y += 1;
if (y>y3) lloopDone=true;
}
}
void DrawTriangle(int x1,int y1,int x2,int y2,int x3,int y3,int col) {
DrawLine(x1,y1,x2,y2,col);
DrawLine(x2,y2,x3,y3,col);
DrawLine(x3,y3,x1,y1,col);
}
void DrawLine(int x1,int y1,int x2,int y2,int col) {
int x=0,y=0,dx=0,dy=0,dx1=0,dy1=0,px=0,py=0,xe=0,ye=0;
dx=x2-x1;dy=y2-y1;
dx1=Math.abs(dx);dy1=Math.abs(dy);
px=2*dy1-dx1;py=2*dx1-dy1;
if (dy1<=dx1) {
if (dx>=0) {
x=x1;y=y1;xe=x2;
} else {
x=x2;y=y2;xe=x1;
}
Draw(x,y,col);
while (x<xe) {
x=x+1;
if (px<0) {
px=px+2*dy1;
} else {
if ((dx<0&&dy<0)||(dx>0&&dy>0)) {
y=y+1;
} else {
y=y-1;
}
px=px+2*(dy1-dx1);
}
Draw(x,y,col);
}
} else {
if (dy>=0) {
x=x1;y=y1;ye=y2;
} else {
x=x2;y=y2;ye=y1;
}
Draw(x,y,col);
while (y<ye) {
y=y+1;
if (py<=0) {
py=py+2*dx1;
} else {
if ((dx<0&&dy<0)||(dx>0&&dy>0)) {
x=x+1;
} else {
x=x-1;
}
py=py+2*(dx1-dy1);
}
Draw(x,y,col);
}
}
}
void Draw(int x,int y,int col) {
if (x>=0&&y>=0&&x<width&&y<height) {
int alpha = col>>>24;
if (alpha>0&&alpha<255) {
float ratio = alpha/255f;
int prev_col = pixels[x+y*width];
int prev_r=prev_col&0xFF;
int prev_g=(prev_col&0xFF00)>>>8;
int prev_b=(prev_col&0xFF0000)>>>16;
int r=col&0xFF;
int g=(col&0xFF00)>>>8;
int b=(col&0xFF0000)>>>16;
int new_r=(int)(ratio*r+(1-ratio)*prev_r);
int new_g=(int)(ratio*g+(1-ratio)*prev_g);
int new_b=(int)(ratio*b+(1-ratio)*prev_b);
pixels[x+y*width]=new_r+(new_g<<8)+(new_b<<16)+(col&0xFF000000);
} else {
pixels[x+y*width]=col;
}
}
}
}

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