shithub: tinyrend

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experiments with triangle and circle shaders.

--- a/main.c

+++ b/main.c

@@ -212,9 +212,8 @@

 	Point p;

 	Memimage *c;

-	p = r.min;

-	for(; p.y < r.max.y; p.y++)

-		for(p.x = 0; p.x < r.max.x; p.x++)

+	for(p.y = r.min.y; p.y < r.max.y; p.y++)

+		for(p.x = r.min.x; p.x < r.max.x; p.x++)

 			if((c = shader(p)) != nil)

 				pixel(dst, p, c);

 }

@@ -225,6 +224,7 @@

 	Triangle2 t;

 	Rectangle bbox;

 	Point3 bc;

+	uchar cbuf[4];

 	t.p0 = Pt2(240,200,1);

 	t.p1 = Pt2(400,40,1);

@@ -240,9 +240,39 @@

 	bc = barycoords(t, Pt2(p.x,p.y,1));

 	if(bc.x < 0 || bc.y < 0 || bc.z < 0)

 		return nil;

+

+	cbuf[0] = 0xFF;

+	cbuf[1] = 0xFF*bc.z;

+	cbuf[2] = 0xFF*bc.y;

+	cbuf[3] = 0xFF*bc.x;

+	memfillcolor(red, *(ulong*)cbuf);

 	return red;

 }

+Memimage *

+circleshader(Point p)

+{

+	Point2 uv;

+	double r;

+	uchar cbuf[4];

+

+	uv = Pt2(p.x,p.y,1);

+	uv.x /= Dx(fb->r);

+	uv.y /= Dy(fb->r);

+	r = 0.3;

+

+	if(vec2len(subpt2(uv, Vec2(0.5,0.5))) > r)

+		return nil;

+

+	cbuf[0] = 0xFF;

+	cbuf[1] = 0;

+	cbuf[2] = 0xFF*uv.x;

+	cbuf[3] = 0xFF*uv.y;

+

+	memfillcolor(red, *(ulong*)cbuf);

+	return red;

+}

+

 void

 redraw(void)

 {

@@ -320,6 +350,11 @@

 	green = rgb(DGreen);

 	blue = rgb(DBlue);

+	t0 = nanosec();

+	shade(fb, rectsubpt(fb->r, fb->r.min), circleshader);

+	t1 = nanosec();

+	fprint(2, "shader took %lludns\n", t1-t0);

+

 	bresenham(fb, Pt(40,40), Pt(300,300), red);

 	bresenham(fb, Pt(80,80), Pt(100,200), red);

 	bresenham(fb, Pt(80,80), Pt(200,100), red);

@@ -337,7 +372,6 @@

 	fprint(2, "shader took %lludns\n", t1-t0);

 	drawc = chancreate(sizeof(void*), 1);

-

 	display->locking = 1;

 	unlockdisplay(display);

 	nbsend(drawc, nil);