shithub: libgraphics

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add a Camera.invproj property

--- a/camera.c

+++ b/camera.c

@@ -187,6 +187,9 @@

 		break;

 	default: sysfatal("unknown projection type");

 	}

+

+	memmove(c->invproj, c->proj, sizeof(Matrix3));

+	invm3(c->invproj);

 }

 void

--- a/graphics.h

+++ b/graphics.h

@@ -403,8 +403,9 @@

 	struct {

 		double n, f;	/* near and far clipping planes */

 	} clip;

-	Matrix3 proj;		/* VCS to clip space xform */

 	Projection projtype;

+	Matrix3 proj;		/* VCS to clip space xform */

+	Matrix3 invproj;	/* clip space to VCS xform */

 	int cullmode;

 	uint rendopts;

--- a/xform.c

+++ b/xform.c

@@ -100,12 +100,9 @@

 Point3

 ndc2vcs(Camera *c, Point3 p)

 {

-	Matrix3 invproj;

 	Point3 np;

-	memmove(invproj, c->proj, sizeof(Matrix3));

-	invm3(invproj);

-	np = xform3(p, invproj);

+	np = xform3(p, c->invproj);

 	np.w = np.w == 0? 0: 1.0/np.w;

 	np.x *= np.w;

 	np.y *= np.w;

-- 

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