ref: 263444216730830b712a4f8f3a087513c5ac93e9
dir: /graphics.h/
typedef enum {
Portho, /* orthographic */
Ppersp /* perspective */
} Projection;
typedef struct Vertex Vertex;
typedef struct Viewport Viewport;
typedef struct Camera Camera;
struct Vertex {
Point3 p; /* position */
Point3 n; /* surface normal */
};
struct Viewport
{
RFrame;
Memimage *fb;
};
struct Camera {
RFrame3; /* VCS */
Viewport viewport;
double fov; /* vertical FOV */
double clipn;
double clipf;
Matrix3 proj; /* VCS to NDC xform */
Projection ptype;
void (*updatefb)(Camera*, Rectangle, ulong);
};
/* Camera */
Camera *alloccamera(Rectangle, ulong);
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*);