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typedef enum {
Portho, /* orthographic */
Ppersp /* perspective */
} Projection;
typedef struct Vertex Vertex;
typedef struct Triangle Triangle;
typedef struct Viewport Viewport;
typedef struct Camera Camera;
struct Vertex {
Point3 p; /* position */
Point3 n; /* surface normal */
//Image tx; /* (?) */
};
struct Triangle {
Point p0, p1, p2;
};
struct Camera {
RFrame3; /* VCS */
Image *viewport;
double fov; /* vertical FOV */
struct {
double n, f; /* near and far clipping planes */
} clip;
Matrix3 proj; /* VCS to NDC xform */
Projection ptype;
};
/* Triangle */
Triangle Trian(int, int, int, int, int, int);
Triangle Trianpt(Point, Point, Point);
void triangle(Image *, Triangle, int, Image *, Point);
void filltriangle(Image *, Triangle, Image *, Point);
/* Camera */
void perspective(Matrix3, double, double, double, double);
void orthographic(Matrix3, double, double, double, double, double, double);
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 line3(Camera *c, Point3 p0, Point3 p1, int end0, int end1, Image *src);
Point string3(Camera *c, Point3 p, Image *src, Font *f, char *s);
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