ref: 3155c6737832c54310c70ecaaf8667d0362de5e8
dir: /graphics.h/
#define HZ2MS(hz) (1000/(hz))
#define min(a, b) ((a)<(b)?(a):(b))
#define max(a, b) ((a)>(b)?(a):(b))
typedef enum {
ORTHOGRAPHIC,
PERSPECTIVE,
} Projection;
enum {
/* culling modes */
CullNone,
CullFront,
CullBack,
/* render options */
ROBlend = 0x01,
RODepth = 0x02,
ROAbuff = 0x04,
/* primitive types */
PPoint = 0,
PLine,
PTriangle,
/* light types */
LightPoint = 0,
LightDirectional,
LightSpot,
/* raster formats */
COLOR32 = 0, /* RGBA32 */
FLOAT32, /* F32 */
/* texture types */
RAWTexture = 0, /* unmanaged */
sRGBTexture,
/* upscaling filters */
UFNone = 0, /* nearest neighbour */
UFScale2x,
UFScale3x,
UFScale4x,
/* vertex attribute types */
VAPoint = 0,
VANumber,
};
typedef struct Color Color;
typedef struct Texture Texture;
typedef struct Cubemap Cubemap;
typedef struct Vertexattr Vertexattr;
typedef struct Vertex Vertex;
typedef struct LightSource LightSource;
typedef struct Material Material;
typedef struct Primitive Primitive;
typedef struct Model Model;
typedef struct Entity Entity;
typedef struct Scene Scene;
typedef struct Shaderparams Shaderparams;
typedef struct SUparams SUparams;
typedef struct Shadertab Shadertab;
typedef struct Rendertime Rendertime;
typedef struct Renderer Renderer;
typedef struct Renderjob Renderjob;
typedef struct Fragment Fragment;
typedef struct Astk Astk;
typedef struct Abuf Abuf;
typedef struct Raster Raster;
typedef struct Framebuf Framebuf;
typedef struct Framebufctl Framebufctl;
typedef struct Viewport Viewport;
typedef struct Camera Camera;
struct Color
{
double r, g, b, a;
};
struct Texture
{
Memimage *image;
int type;
};
struct Cubemap
{
char *name;
Texture *faces[6];
};
/*
* a more general approach worth investigating.
* it could be made to handle types other than double.
*
* examples:
* double intens;
* addvattr(v, "intensity", 1, &intens);
*
* Point3 p;
* addvattr(v, "normal", 3, &p);
*
* Matrix3 m;
* addvattr(v, "proj", 4*4, m);
*/
//struct Vertexattr
//{
// char *id;
// int type;
// ulong len;
// double val[];
//};
struct Vertexattr
{
char *id;
int type;
union {
Point3 p;
double n;
};
};
struct Vertex
{
Point3 p; /* position */
Point3 n; /* surface normal */
Color c; /* shading color */
Point2 uv; /* texture coordinate */
Material *mtl;
Point3 tangent;
/* TODO it'd be neat to use a dynamic hash table instead */
Vertexattr *attrs; /* attributes (aka varyings) */
ulong nattrs;
};
struct LightSource
{
Point3 p;
Point3 dir;
Color c;
int type;
/* spotlights */
double θu; /* umbra angle. anything beyond is unlit */
double θp; /* penumbra angle. anything within is fully lit */
};
struct Material
{
char *name;
Color ambient;
Color diffuse;
Color specular;
double shininess;
Texture *diffusemap;
Texture *specularmap;
Texture *normalmap;
};
struct Primitive
{
int type;
Vertex v[3];
Material *mtl;
Point3 tangent; /* used for normal mapping */
};
struct Model
{
Primitive *prims;
ulong nprims;
Material *materials;
ulong nmaterials;
Texture *tex; /* texture map (TODO get rid of it, use materials) */
int (*addprim)(Model*, Primitive);
int (*addmaterial)(Model*, Material);
};
struct Entity
{
RFrame3;
char *name;
Model *mdl;
Entity *prev, *next;
};
struct Scene
{
char *name;
Entity ents;
ulong nents;
Cubemap *skybox;
void (*addent)(Scene*, Entity*);
void (*delent)(Scene*, Entity*);
Entity *(*getent)(Scene*, char*);
};
struct Shaderparams
{
SUparams *su;
Vertex *v;
Point p; /* fragment position (fshader-only) */
uint idx; /* vertex index (vshader-only) */
Vertexattr *(*getuniform)(Shaderparams*, char*);
Vertexattr *(*getattr)(Shaderparams*, char*);
void (*setattr)(Shaderparams*, char*, int, void*);
void (*toraster)(Shaderparams*, char*, void*);
};
/* shader unit params */
struct SUparams
{
Framebuf *fb;
Renderjob *job;
Camera *camera;
Entity *entity;
Primitive *eb, *ee;
uvlong uni_time;
Point3 (*vshader)(Shaderparams*);
Color (*fshader)(Shaderparams*);
};
struct Shadertab
{
char *name;
Point3 (*vshader)(Shaderparams*); /* vertex shader */
Color (*fshader)(Shaderparams*); /* fragment shader */
};
struct Rendertime
{
uvlong t0, t1;
};
struct Renderer
{
Channel *jobq;
ulong nprocs;
int doprof; /* enable profiling */
};
struct Renderjob
{
Ref;
uvlong id;
Renderer *rctl;
Framebuf *fb;
Camera *camera;
Scene *scene;
Shadertab *shaders;
Channel *donec;
Rectangle *cliprects; /* one per rasterizer */
int ncliprects;
struct {
/* renderer, entityproc, tilers, rasterizers */
Rendertime R, E, *Tn, *Rn;
} times;
Renderjob *next;
};
struct Fragment
{
Color c;
float z;
};
struct Astk
{
Point p;
Fragment *items;
ulong size;
int active;
};
struct Abuf
{
QLock;
Astk *stk; /* framebuffer fragment stacks */
Astk **act; /* active fragment stacks */
ulong nact;
};
struct Raster
{
Rectangle r;
char *name;
ulong chan;
ulong *data;
Raster *next;
};
struct Framebuf
{
Rectangle r;
Rectangle clipr;
Raster *rasters; /* [0] color, [1] depth, [n] user-defined */
Abuf abuf; /* A-buffer */
void (*createraster)(Framebuf*, char*, ulong);
Raster *(*fetchraster)(Framebuf*, char*);
};
struct Framebufctl
{
QLock;
Framebuf *fb[2]; /* double buffering */
uint idx; /* front buffer index */
uint upfilter; /* upscaling filter */
void (*draw)(Framebufctl*, Image*, char*, Point, Point);
void (*memdraw)(Framebufctl*, Memimage*, char*, Point, Point);
void (*swap)(Framebufctl*);
void (*reset)(Framebufctl*);
void (*createraster)(Framebufctl*, char*, ulong);
Raster *(*fetchraster)(Framebufctl*, char*);
Framebuf *(*getfb)(Framebufctl*);
Framebuf *(*getbb)(Framebufctl*);
};
struct Viewport
{
RFrame;
Framebufctl *fbctl;
Rectangle r;
void (*draw)(Viewport*, Image*, char*);
void (*memdraw)(Viewport*, Memimage*, char*);
void (*setscale)(Viewport*, double, double);
void (*setscalefilter)(Viewport*, int);
Framebuf *(*getfb)(Viewport*);
int (*getwidth)(Viewport*);
int (*getheight)(Viewport*);
void (*createraster)(Viewport*, char*, ulong);
Raster *(*fetchraster)(Viewport*, char*);
};
struct Camera
{
RFrame3; /* VCS */
Viewport *view;
Scene *scene;
Renderer *rctl;
double fov; /* vertical FOV */
struct {
double n, f; /* near and far clipping planes */
} clip;
Matrix3 proj; /* VCS to clip space xform */
Projection projtype;
int cullmode;
uint rendopts;
struct {
uvlong min, avg, max, acc, n, v;
uvlong nframes;
} stats;
};
/* camera */
Camera *Camv(Viewport*, Renderer*, Projection, double, double, double);
Camera *Cam(Rectangle, Renderer*, Projection, double, double, double);
Camera *newcamera(void);
void delcamera(Camera*);
void reloadcamera(Camera*);
void configcamera(Camera*, Projection, double, double, double);
void placecamera(Camera*, Scene*, Point3, Point3, Point3);
void movecamera(Camera*, Point3);
void rotatecamera(Camera*, Point3, double);
void aimcamera(Camera*, Point3);
void shootcamera(Camera*, Shadertab*);
/* viewport */
Viewport *mkviewport(Rectangle);
void rmviewport(Viewport*);
/* render */
Renderer *initgraphics(void);
/* xform */
Point3 model2world(Entity*, Point3);
Point3 world2vcs(Camera*, Point3);
Point3 vcs2clip(Camera*, Point3);
Point3 world2clip(Camera*, Point3);
Point3 clip2ndc(Point3);
Point3 ndc2viewport(Framebuf*, Point3);
Point3 viewport2ndc(Framebuf*, Point3);
Point3 ndc2vcs(Camera*, Point3);
Point3 viewport2vcs(Camera*, Point3);
Point3 vcs2world(Camera*, Point3);
Point3 viewport2world(Camera*, Point3);
Point3 world2model(Entity*, Point3);
void perspective(Matrix3, double, double, double, double);
void orthographic(Matrix3, double, double, double, double, double, double);
/* marshal */
Model *readmodel(int);
usize writemodel(int, Model*);
/* scene */
Model *newmodel(void);
Model *dupmodel(Model*);
void delmodel(Model*);
Entity *newentity(char*, Model*);
Entity *dupentity(Entity*);
void delentity(Entity*);
Scene *newscene(char*);
Scene *dupscene(Scene*);
void delscene(Scene*);
void clearscene(Scene*);
/* vertex */
void addvattr(Vertex*, char*, int, void*);
Vertexattr *getvattr(Vertex*, char*);
/* texture */
Texture *alloctexture(int, Memimage*);
Texture *duptexture(Texture*);
void freetexture(Texture*);
Color neartexsampler(Texture*, Point2);
Color bilitexsampler(Texture*, Point2);
Color sampletexture(Texture*, Point2, Color(*)(Texture*, Point2));
Cubemap *readcubemap(char*[6]);
Cubemap *dupcubemap(Cubemap*);
void freecubemap(Cubemap*);
Color samplecubemap(Cubemap*, Point3, Color(*)(Texture*, Point2));
/* util */
Point minpt(Point, Point);
Point maxpt(Point, Point);
Point2 modulapt2(Point2, Point2);
Point2 minpt2(Point2, Point2);
Point2 maxpt2(Point2, Point2);
int eqpt2(Point2, Point2);
Point3 modulapt3(Point3, Point3);
Point3 minpt3(Point3, Point3);
Point3 maxpt3(Point3, Point3);
int eqpt3(Point3, Point3);
Memimage *rgba(ulong);
Memimage *dupmemimage(Memimage*);
/* color */
ulong col2ul(Color);
Color ul2col(ulong);
int hasalpha(ulong);
Color srgb2linear(Color);
Color linear2srgb(Color);
Color aces(Color);
Color aces2(Color);
/* shadeop */
double sign(double);
double step(double, double);
double smoothstep(double, double, double);
Color getlightcolor(LightSource*, Point3);
extern Rectangle UR; /* unit rectangle */