1 files changed, 42 insertions, 0 deletions
diff --git a/graphics.h b/graphics.h
new file mode 100644
index 0000000..b9582f3
--- /dev/null
+++ b/graphics.h
@@ -0,0 +1,42 @@
+typedef enum {
+	Portho,		/* orthographic */
+	Ppersp		/* perspective */
+} Projection;
+
+typedef struct Vertex Vertex;
+typedef struct Camera Camera;
+
+struct Vertex {
+	Point3 p;	/* position */
+	Point3 n;	/* surface normal */
+};
+
+struct Camera {
+	RFrame3;		/* VCS */
+	Image *viewport;
+	double fov;		/* vertical FOV */
+	struct {
+		double n, f;
+	} clip;
+	Matrix3 proj;		/* VCS to NDC xform */
+	Projection ptype;
+};
+
+/* Camera */
+void configcamera(Camera*, Image*, double, double, double, Projection);
+void placecamera(Camera*, Point3, Point3, Point3);
+void aimcamera(Camera*, Point3);
+void reloadcamera(Camera*);
+
+/* rendering */
+#define FPS2MS(n)		(1000/(n))
+#define WORLD2VCS(cp, p)	(rframexform3((p), *(cp)))
+#define VCS2NDC(cp, p)		(xform3((p), (cp)->proj))
+#define WORLD2NDC(cp, p)	(VCS2NDC((cp), WORLD2VCS((cp), (p))))
+int isclipping(Point3);
+Point toviewport(Camera*, Point3);
+Point2 fromviewport(Camera*, Point);
+void perspective(Matrix3, double, double, double, double);
+void orthographic(Matrix3, double, double, double, double, double, double);
+void line3(Camera*, Point3, Point3, int, int, Image*);
+Point string3(Camera*, Point3, Image*, Font*, char*);