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#define HZ2MS(hz) (1000/(hz))
typedef enum {
ORTHOGRAPHIC,
PERSPECTIVE
} Projection;
typedef struct Color Color;
typedef struct Vertex Vertex;
typedef struct VSparams VSparams;
typedef struct FSparams FSparams;
typedef struct SUparams SUparams;
typedef struct Shader Shader;
typedef struct Framebuf Framebuf;
typedef struct Framebufctl Framebufctl;
typedef struct Viewport Viewport;
typedef struct Camera Camera;
struct Color
{
double r, g, b, a;
};
struct Vertex
{
Point3 p; /* position */
Point3 n; /* surface normal */
Color c; /* shading color */
Point2 uv; /* texture coordinate */
};
typedef Vertex Triangle[3];
/* shader params */
struct VSparams
{
SUparams *su;
Vertex *v;
uint idx;
};
struct FSparams
{
SUparams *su;
Memimage *frag;
Point p;
Point3 bc;
uchar *cbuf;
};
/* shader unit params */
struct SUparams
{
Framebuf *fb;
OBJElem **b, **e;
int id;
Channel *donec;
/* TODO replace with a Scene */
OBJ *model;
Memimage *modeltex;
double var_intensity[3];
uvlong uni_time;
Point3 (*vshader)(VSparams*);
Memimage *(*fshader)(FSparams*);
};
struct Shader
{
char *name;
Point3 (*vshader)(VSparams*); /* vertex shader */
Memimage *(*fshader)(FSparams*); /* fragment shader */
};
struct Framebuf
{
Memimage *cb; /* color buffer */
double *zbuf; /* z/depth buffer */
Lock zbuflk;
Rectangle r;
};
struct Framebufctl
{
Framebuf *fb[2]; /* double buffering */
uint idx; /* front buffer index */
Lock swplk;
void (*draw)(Framebufctl*, Memimage*);
void (*swap)(Framebufctl*);
void (*reset)(Framebufctl*);
};
struct Viewport
{
RFrame;
Framebufctl *fbctl;
};
struct Camera
{
RFrame3; /* VCS */
Viewport *vp;
double fov; /* vertical FOV */
struct {
double n, f; /* near and far clipping planes */
} clip;
Matrix3 proj; /* VCS to NDC xform */
Projection projtype;
struct {
uvlong min, avg, max, acc, n, v;
} stats;
};
/* camera */
void configcamera(Camera*, Viewport*, double, double, double, Projection);
void placecamera(Camera*, Point3, Point3, Point3);
void aimcamera(Camera*, Point3);
void reloadcamera(Camera*);
void shootcamera(Camera*, OBJ*, Memimage*, Shader*);
/* viewport */
Viewport *mkviewport(Rectangle);
void rmviewport(Viewport*);
/* render */
Point3 world2vcs(Camera*, Point3);
Point3 vcs2clip(Camera*, Point3);
Point3 world2clip(Camera*, Point3);
void perspective(Matrix3, double, double, double, double);
void orthographic(Matrix3, double, double, double, double, double, double);
/* util */
double fmin(double, double);
double fmax(double, double);
Memimage *rgb(ulong);
/* shadeop */
double step(double, double);
double smoothstep(double, double, double);
extern Rectangle UR; /* unit rectangle */
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