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typedef enum {
Portho, /* orthographic */
Ppersp /* perspective */
} Projection;
typedef struct Color Color;
typedef struct Vertex Vertex;
typedef struct Framebuffer Framebuffer;
typedef struct Viewport Viewport;
typedef struct Camera Camera;
struct Color
{
double r, g, b;
};
struct Vertex
{
Point3 p; /* position */
Point3 n; /* surface normal */
Color c; /* shading color */
};
struct Framebuffer
{
Rectangle r; /* frame geometry */
int bpp; /* bytes per pixel */
uchar *color; /* pixel color buffer */
float *depth; /* pixel depth buffer */
};
struct Viewport
{
RFrame;
Framebuffer;
};
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;
};
/* Camera */
void configcamera(Camera*, Image*, double, double, double, Projection);
void placecamera(Camera*, Point3, Point3, Point3);
void aimcamera(Camera*, Point3);
void reloadcamera(Camera*);
/* rendering */
#define FPS (60) /* frame rate */
#define MS2FR (1e3/FPS) /* ms per frame */
Point3 world2vcs(Camera*, Point3);
Point3 vcs2ndc(Camera*, Point3);
Point3 world2ndc(Camera*, Point3);
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*);
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