libgeometry revamp

1 files changed, 0 insertions, 169 deletions

diff --git a/sys/src/libgeometry/tstack.c b/sys/src/libgeometry/tstack.c
deleted file mode 100644
index 6867cd4d4..000000000
--- a/sys/src/libgeometry/tstack.c
+++ /dev/null
@@ -1,169 +0,0 @@
-/*% cc -gpc %
- * These transformation routines maintain stacks of transformations
- * and their inverses.  
- * t=pushmat(t)		push matrix stack
- * t=popmat(t)		pop matrix stack
- * rot(t, a, axis)	multiply stack top by rotation
- * qrot(t, q)		multiply stack top by rotation, q is unit quaternion
- * scale(t, x, y, z)	multiply stack top by scale
- * move(t, x, y, z)	multiply stack top by translation
- * xform(t, m)		multiply stack top by m
- * ixform(t, m, inv)	multiply stack top by m.  inv is the inverse of m.
- * look(t, e, l, u)	multiply stack top by viewing transformation
- * persp(t, fov, n, f)	multiply stack top by perspective transformation
- * viewport(t, r, aspect)
- *			multiply stack top by window->viewport transformation.
- */
-#include <u.h>
-#include <libc.h>
-#include <draw.h>
-#include <geometry.h>
-Space *pushmat(Space *t){
-	Space *v;
-	v=malloc(sizeof(Space));
-	if(t==0){
-		ident(v->t);
-		ident(v->tinv);
-	}
-	else
-		*v=*t;
-	v->next=t;
-	return v;
-}
-Space *popmat(Space *t){
-	Space *v;
-	if(t==0) return 0;
-	v=t->next;
-	free(t);
-	return v;
-}
-void rot(Space *t, double theta, int axis){
-	double s=sin(radians(theta)), c=cos(radians(theta));
-	Matrix m, inv;
-	register i=(axis+1)%3, j=(axis+2)%3;
-	ident(m);
-	m[i][i] = c;
-	m[i][j] = -s;
-	m[j][i] = s;
-	m[j][j] = c;
-	ident(inv);
-	inv[i][i] = c;
-	inv[i][j] = s;
-	inv[j][i] = -s;
-	inv[j][j] = c;
-	ixform(t, m, inv);
-}
-void qrot(Space *t, Quaternion q){
-	Matrix m, inv;
-	int i, j;
-	qtom(m, q);
-	for(i=0;i!=4;i++) for(j=0;j!=4;j++) inv[i][j]=m[j][i];
-	ixform(t, m, inv);
-}
-void scale(Space *t, double x, double y, double z){
-	Matrix m, inv;
-	ident(m);
-	m[0][0]=x;
-	m[1][1]=y;
-	m[2][2]=z;
-	ident(inv);
-	inv[0][0]=1/x;
-	inv[1][1]=1/y;
-	inv[2][2]=1/z;
-	ixform(t, m, inv);
-}
-void move(Space *t, double x, double y, double z){
-	Matrix m, inv;
-	ident(m);
-	m[0][3]=x;
-	m[1][3]=y;
-	m[2][3]=z;
-	ident(inv);
-	inv[0][3]=-x;
-	inv[1][3]=-y;
-	inv[2][3]=-z;
-	ixform(t, m, inv);
-}
-void xform(Space *t, Matrix m){
-	Matrix inv;
-	if(invertmat(m, inv)==0) return;
-	ixform(t, m, inv);
-}
-void ixform(Space *t, Matrix m, Matrix inv){
-	matmul(t->t, m);
-	matmulr(t->tinv, inv);
-}
-/*
- * multiply the top of the matrix stack by a view-pointing transformation
- * with the eyepoint at e, looking at point l, with u at the top of the screen.
- * The coordinate system is deemed to be right-handed.
- * The generated transformation transforms this view into a view from
- * the origin, looking in the positive y direction, with the z axis pointing up,
- * and x to the right.
- */
-void look(Space *t, Point3 e, Point3 l, Point3 u){
-	Matrix m, inv;
-	Point3 r;
-	l=unit3(sub3(l, e));
-	u=unit3(vrem3(sub3(u, e), l));
-	r=cross3(l, u);
-	/* make the matrix to transform from (rlu) space to (xyz) space */
-	ident(m);
-	m[0][0]=r.x; m[0][1]=r.y; m[0][2]=r.z;
-	m[1][0]=l.x; m[1][1]=l.y; m[1][2]=l.z;
-	m[2][0]=u.x; m[2][1]=u.y; m[2][2]=u.z;
-	ident(inv);
-	inv[0][0]=r.x; inv[0][1]=l.x; inv[0][2]=u.x;
-	inv[1][0]=r.y; inv[1][1]=l.y; inv[1][2]=u.y;
-	inv[2][0]=r.z; inv[2][1]=l.z; inv[2][2]=u.z;
-	ixform(t, m, inv);
-	move(t, -e.x, -e.y, -e.z);
-}
-/*
- * generate a transformation that maps the frustum with apex at the origin,
- * apex angle=fov and clipping planes y=n and y=f into the double-unit cube.
- * plane y=n maps to y'=-1, y=f maps to y'=1
- */
-int persp(Space *t, double fov, double n, double f){
-	Matrix m;
-	double z;
-	if(n<=0 || f<=n || fov<=0 || 180<=fov) /* really need f!=n && sin(v)!=0 */
-		return -1;
-	z=1/tan(radians(fov)/2);
-	m[0][0]=z; m[0][1]=0;           m[0][2]=0; m[0][3]=0;
-	m[1][0]=0; m[1][1]=(f+n)/(f-n); m[1][2]=0; m[1][3]=f*(1-m[1][1]);
-	m[2][0]=0; m[2][1]=0;           m[2][2]=z; m[2][3]=0;
-	m[3][0]=0; m[3][1]=1;           m[3][2]=0; m[3][3]=0;
-	xform(t, m);
-	return 0;
-}
-/*
- * Map the unit-cube window into the given screen viewport.
- * r has min at the top left, max just outside the lower right.  Aspect is the
- * aspect ratio (dx/dy) of the viewport's pixels (not of the whole viewport!)
- * The whole window is transformed to fit centered inside the viewport with equal
- * slop on either top and bottom or left and right, depending on the viewport's
- * aspect ratio.
- * The window is viewed down the y axis, with x to the left and z up.  The viewport
- * has x increasing to the right and y increasing down.  The window's y coordinates
- * are mapped, unchanged, into the viewport's z coordinates.
- */
-void viewport(Space *t, Rectangle r, double aspect){
-	Matrix m;
-	double xc, yc, wid, hgt, scale;
-	xc=.5*(r.min.x+r.max.x);
-	yc=.5*(r.min.y+r.max.y);
-	wid=(r.max.x-r.min.x)*aspect;
-	hgt=r.max.y-r.min.y;
-	scale=.5*(wid<hgt?wid:hgt);
-	ident(m);
-	m[0][0]=scale;
-	m[0][3]=xc;
-	m[1][1]=0;
-	m[1][2]=-scale;
-	m[1][3]=yc;
-	m[2][1]=1;
-	m[2][2]=0;
-	/* should get inverse by hand */
-	xform(t, m);
-}