Emscripten-Generated Code

├── .gitattributes ├── .gitignore ├── README.md ├── argbcolor.nelua ├── camera.nelua ├── config.nelua ├── docs ├── index.html ├── lunray.js └── lunray.wasm ├── lunray.nelua ├── material.nelua ├── mathx.nelua ├── perlin.nelua ├── ray.nelua ├── sdf2d.nelua ├── sdl2.nelua ├── sphere.nelua ├── texture.nelua ├── vec2.nelua ├── vec3.nelua └── window.nelua /.gitattributes: -------------------------------------------------------------------------------- 1 | *.nelua text eol=lf linguist-language=lua 2 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | nelua_cache 2 | neluacfg.lua 3 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Ray tracing experiment in Nelua 2 | 3 | ![Screenshot](https://i.gyazo.com/e115cf341b496ef022ebd5900d80a099.png) 4 | 5 | This project was developed for fun while [Nelua](https://github.com/edubart/nelua-lang) 6 | was being created. 7 | Ray tracing in realtime on the CPU is hard and tackling this problem was interesting 8 | to check out the efficiency of Nelua language. 9 | 10 | This is highly inspired on the 11 | [Ray Tracing in One Weekend](https://raytracing.github.io/books/RayTracingInOneWeekend.html) 12 | tutorial but with some personal customizations. 13 | 14 | ## Controls 15 | 16 | Use ASWDQE keys to walk and arrows to rotate the camera. 17 | 18 | ## Running on the Web Browser with WASM 19 | 20 | A demo with half resolution compiled with [emscripten](https://emscripten.org/) is available at https://edubart.github.io/lunray/ 21 | Your browser needs WASM support to run, note that this is running on the CPU inside the 22 | browser so slowness is expected, on my browser I get about ~11 FPS. 23 | 24 | ## Running natively 25 | 26 | With Nelua and SDL2 libs installed just do: 27 | 28 | ``` 29 | git clone https://github.com/edubart/lunray && cd lunray 30 | nelua --maximum-performance lunray.nelua 31 | ``` 32 | 33 | For higher FPS uncomment the `OPENMP = true` line on `lunray.nelua` to enable 34 | multi-threading rendering. I get about ~18 FPS on the screenshot generated above. 35 | -------------------------------------------------------------------------------- /argbcolor.nelua: -------------------------------------------------------------------------------- 1 | global argbcolor = @record{ 2 | r: byte, 3 | g: byte, 4 | b: byte, 5 | a: byte, 6 | } 7 | 8 | function argbcolor.fromvec3(col: vec3): argbcolor 9 | return argbcolor{ 10 | (@uint8)(math.clamp(col.x*255, 0, 255)), 11 | (@uint8)(math.clamp(col.y*255, 0, 255)), 12 | (@uint8)(math.clamp(col.z*255, 0, 255)), 13 | 255 14 | } 15 | end 16 | -------------------------------------------------------------------------------- /camera.nelua: -------------------------------------------------------------------------------- 1 | global Camera = @record{ 2 | lower_left_corner: vec3, 3 | lower_left_corner_direction: vec3, 4 | horizontal: vec3, 5 | vertical: vec3, 6 | origin: vec3, 7 | lookat: vec3, 8 | vup: vec3, 9 | u: vec3, 10 | v: vec3, 11 | w: vec3, 12 | lensradius: number, 13 | vfov: number, 14 | aspect: number, 15 | aperture: number, 16 | focusdist: number, 17 | } 18 | 19 | function Camera:update() 20 | local theta = self.vfov*math.pi/180 21 | local half_height = math.tan(theta/2) 22 | local half_width = self.aspect * half_height 23 | self.w = vec3.unit(self.origin - self.lookat) 24 | self.u = vec3.unit(vec3.cross(self.vup, self.w)) 25 | self.v = vec3.cross(self.w, self.u) 26 | self.lower_left_corner = 27 | self.origin - ( 28 | self.u * (half_width*self.focusdist) + 29 | self.v * (half_height*self.focusdist) + 30 | self.w * self.focusdist) 31 | self.lower_left_corner_direction = self.lower_left_corner - self.origin 32 | self.horizontal = self.u * (2*half_width*self.focusdist) 33 | self.vertical = self.v * (2*half_height*self.focusdist) 34 | self.lensradius = self.aperture / 2 35 | end 36 | 37 | function Camera.create(lookfrom: vec3, lookat: vec3, vup: vec3, 38 | vfov: number, aspect: number, aperture: number, focusdist: number): Camera 39 | if aperture == 0 then 40 | focusdist = 1 41 | end 42 | local self = Camera{ 43 | origin = lookfrom, 44 | lookat = lookat, 45 | vup = vup, 46 | vfov = vfov, 47 | aspect = aspect, 48 | aperture = aperture, 49 | focusdist = focusdist, 50 | } 51 | self:update() 52 | return self 53 | end 54 | 55 | function Camera:getray(u: number, v: number) 56 | local r: Ray 57 | if self.aperture ~= 0 then 58 | local rd = vec3.random_in_disk(self.lensradius) 59 | local offset = self.u * rd.x + self.v * rd.y 60 | r.origin = self.origin + offset 61 | r.direction = (self.lower_left_corner + self.horizontal * u + self.vertical * v) - r.origin 62 | else 63 | r.origin = self.origin 64 | r.direction = self.lower_left_corner_direction + self.horizontal * u + self.vertical * v 65 | end 66 | r.direction = r.direction:unit() 67 | return r 68 | end 69 | 70 | function Camera:rotate(x: number, y: number) 71 | local dir = self.lookat - self.origin 72 | dir = vec3.rotvec(dir, self.u, x) 73 | dir = vec3.rotvec(dir, self.v, y) 74 | self.lookat = self.origin + dir 75 | self:update() 76 | end 77 | 78 | function Camera:translate(x: number, y: number, z: number) 79 | local trans = vec3{0,0,0} 80 | trans = trans + self.u * x 81 | trans = trans + self.w * -z 82 | trans = trans + self.v * y 83 | self.origin = self.origin + trans 84 | self.lookat = self.lookat + trans 85 | self:update() 86 | end 87 | -------------------------------------------------------------------------------- /config.nelua: -------------------------------------------------------------------------------- 1 | ##[[ 2 | primtypes.number = primtypes.float32 3 | primtypes.integer = primtypes.int32 4 | primtypes.uinteger = primtypes.uint32 5 | 6 | if EMSCRIPTEN then 7 | OPENMP = false 8 | config.cc = 'emcc' 9 | cflags '--llvm-lto 1 --closure 1 -s USE_SDL=2 -s TOTAL_MEMORY=67108864' 10 | cinclude '' 11 | end 12 | if OPENMP then 13 | cflags '-fopenmp' 14 | end 15 | ]] 16 | -------------------------------------------------------------------------------- /docs/index.html: -------------------------------------------------------------------------------- 1 | Emscripten-Generated Code

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then 68 | return emitted 69 | end 70 | local forward, attenuation, scattered = Material.scatter(rec.mat, r, rec) 71 | if forward then 72 | return emitted + trace_ray(scattered, depth+1) * attenuation 73 | else 74 | return emitted 75 | end 76 | end 77 | return sky_color(r.direction) 78 | end 79 | 80 | local function draw() 81 | ## if DENOISER then 82 | if ntem == 0 then 83 | for y=0, = 3 151 | for a=-NUMSPHERES, 182 | local event: SDL_Event 183 | while SDL_PollEvent(&event) ~= 0 do 184 | switch event.type 185 | case SDL_QUIT then 186 | quit = true 187 | case SDL_KEYDOWN then 188 | local kevent = (@*SDL_KeyboardEvent)(&event) 189 | switch kevent.keysym.sym 190 | case SDLK_UP then 191 | cam:rotate(0.05, 0) 192 | refresh() 193 | case SDLK_DOWN then 194 | cam:rotate(-0.05, 0) 195 | refresh() 196 | case SDLK_RIGHT then 197 | cam:rotate(0, -0.05) 198 | refresh() 199 | case SDLK_LEFT then 200 | cam:rotate(0, 0.05) 201 | refresh() 202 | case SDLK_ESCAPE then 203 | quit = true 204 | case SDLK_w then 205 | cam:translate(0, 0, 0.05) 206 | refresh() 207 | case SDLK_s then 208 | cam:translate(0, 0, -0.05) 209 | refresh() 210 | case SDLK_a then 211 | cam:translate(-0.05, 0, 0) 212 | refresh() 213 | case SDLK_d then 214 | cam:translate(0.05, 0, 0) 215 | refresh() 216 | case SDLK_e then 217 | cam:translate(0, 0.05, 0) 218 | refresh() 219 | case SDLK_q then 220 | cam:translate(0, -0.05, 0) 221 | refresh() 222 | end 223 | end 224 | end 225 | end 226 | 227 | local function frame() 228 | local ticks = SDL_GetTicks() 229 | if ticks - lastticks >= 1000 then 230 | print('FPS', fps) 231 | lastticks = ticks 232 | fps = 0 233 | end 234 | 235 | poll_events() 236 | draw() 237 | fps = fps + 1 238 | end 239 | 240 | local function emframe(context: pointer) 241 | frame() 242 | end 243 | 244 | local function go() 245 | world_init() 246 | window = Window.create(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_SCALE) 247 | 248 | ## if not EMSCRIPTEN then 249 | repeat 250 | frame() 251 | until quit 252 | 253 | window:destroy() 254 | ## else 255 | ## cemit 'emscripten_set_main_loop_arg(emframe, 0, -1, 1);' 256 | ## end 257 | end 258 | 259 | go() 260 | -------------------------------------------------------------------------------- /material.nelua: -------------------------------------------------------------------------------- 1 | global MATERIALS = @enum { 2 | LAMBERTIAN = 0, 3 | METAL = 1, 4 | DIELECTRIC = 2 5 | } 6 | 7 | global Material = @record{ 8 | kind: MATERIALS, 9 | albedo: Texture, 10 | emitting: Texture, 11 | fuzz: number 12 | } 13 | 14 | global Hit = @record{ 15 | p: vec3, 16 | normal: vec3, 17 | uv: vec2, 18 | mat: *Material, 19 | t: number 20 | } 21 | 22 | local function reflect(v: vec3, n: vec3): vec3 23 | return v - n * (2*vec3.dot(v,n)) 24 | end 25 | 26 | local function refract(v: vec3, n: vec3, ni: number): (boolean, vec3) 27 | local dt = vec3.dot(v, n) 28 | local discriminant = 1 - ni*ni*(1-dt*dt) 29 | if discriminant > 0 then 30 | local refracted = 31 | ni * (v - n * dt) - 32 | n * math.sqrt(discriminant) 33 | return true, refracted 34 | else 35 | return false, vec3{} 36 | end 37 | end 38 | 39 | local function schlick(cosine: number, refidx: number): number 40 | local r0 = (1-refidx) / (1+refidx) 41 | r0 = r0*r0 42 | return r0 + (1-r0)*((1-cosine)^5) 43 | end 44 | 45 | function Material:lambertian_scatter(r: Ray, rec: Hit): (boolean, vec3, Ray) 46 | local scattered = Ray{rec.p} 47 | ## if CARTOONIZED then 48 | scattered.direction = vec3{0,1,0} 49 | ## else 50 | scattered.direction = vec3.random_in_hemisphere(rec.normal) 51 | ## end 52 | return true, self.albedo:color(rec.uv, rec.p), scattered 53 | end 54 | 55 | function Material:metal_scatter(r: Ray, rec: Hit): (boolean, vec3, Ray) 56 | local reflected = reflect(r.direction, rec.normal) 57 | ## if not CARTOONIZED then 58 | if self.fuzz > 0 then 59 | reflected = reflected + vec3.random_in_hemisphere(rec.normal) * self.fuzz 60 | end 61 | ## end 62 | local scattered = Ray{rec.p, reflected} 63 | local forward = vec3.dot(scattered.direction, rec.normal) > 0 64 | return forward, self.albedo:color(rec.uv, rec.p), scattered 65 | end 66 | 67 | function Material:dielectric_scatter(r: Ray, rec: Hit): (boolean, vec3, Ray) 68 | local outward_normal: vec3 69 | local ni: number, reflectprob: number 70 | local cosine = vec3.dot(r.direction, rec.normal) 71 | if vec3.dot(r.direction, rec.normal) > 0 then 72 | cosine = math.sqrt(1 - self.fuzz*self.fuzz*(1-cosine*cosine)) 73 | outward_normal = -rec.normal 74 | ni = self.fuzz 75 | else 76 | cosine = -cosine 77 | outward_normal = rec.normal 78 | ni = 1 / self.fuzz 79 | end 80 | local forward, refracted = refract(r.direction, outward_normal, ni) 81 | local scattered = Ray{rec.p} 82 | ## if not CARTOONIZED then 83 | if forward then 84 | reflectprob = schlick(cosine, self.fuzz) 85 | else 86 | reflectprob = 1 87 | end 88 | if math.fastrand() < reflectprob then 89 | scattered.direction = reflect(r.direction, rec.normal) 90 | else 91 | scattered.direction = refracted 92 | end 93 | ## else 94 | scattered.direction = refracted 95 | ## end 96 | return true, vec3{1,1,1}, scattered 97 | end 98 | 99 | function Material:scatter(r: Ray, rec: Hit): (boolean, vec3, Ray) 100 | switch self.kind 101 | case MATERIALS.LAMBERTIAN then 102 | return self:lambertian_scatter(r, rec) 103 | case MATERIALS.METAL then 104 | return self:metal_scatter(r, rec) 105 | case MATERIALS.DIELECTRIC then 106 | return self:dielectric_scatter(r, rec) 107 | end 108 | return false, vec3{}, Ray{} 109 | end 110 | 111 | function Material:emitted(uv: vec2, p: vec3): vec3 112 | return Texture.color(self.emitting, uv, p) 113 | end 114 | -------------------------------------------------------------------------------- /mathx.nelua: -------------------------------------------------------------------------------- 1 | require 'math' 2 | 3 | global math.tau: number = 6.2831853071795865 4 | 5 | function math.smoothstep(edge0: number, edge1: number, x: number): number 6 | local t = math.clamp((x - edge0) / (edge1 - edge0), 0, 1) 7 | return t * t * (3 - 2 * t) 8 | end 9 | 10 | function math.step(edge: number, x: number): number 11 | if x < edge then 12 | return 0 13 | else 14 | return 1 15 | end 16 | end 17 | 18 | function math.fastexp4(x: number): number 19 | x = 1.0 + x * (1.0 / 17.0) 20 | local t = x 21 | ## for i=1,4 do 22 | t=t*t 23 | ## end 24 | return math.max(t*x,0.0) 25 | end 26 | 27 | function math.fastexp8(x: number): number 28 | x = 1.0 + x * (1.0 / 257.0) 29 | local t = x 30 | ## for i=1,8 do 31 | t=t*t 32 | ## end 33 | return math.max(t*x,0.0) 34 | end 35 | 36 | function math.fastsin(x: number): number 37 | x = x*(1.0/math.pi) 38 | local xi = math.floor(x) 39 | local xs = xi - 2*math.floor(0.5*x) 40 | local xf = x - xi 41 | return (1-2*xs)*(4*xf)*(1-xf) 42 | end 43 | 44 | function math.fastcos(x: number): number 45 | return math.fastsin(x + math.pi/2) 46 | end 47 | 48 | local seed: uint32 = 1337 49 | function math.fastrand(): number 50 | seed = 214013 * seed + 2531011 51 | return (seed >> 8) / (1 << 24) 52 | end 53 | -------------------------------------------------------------------------------- /perlin.nelua: -------------------------------------------------------------------------------- 1 | global PERLIN_SIZE = 256 2 | 3 | global Perlin = @record{} 4 | 5 | local perlin: record{ 6 | rands: [PERLIN_SIZE]vec3, 7 | permx: [PERLIN_SIZE]integer, 8 | permy: [PERLIN_SIZE]integer, 9 | permz: [PERLIN_SIZE]integer 10 | } 11 | 12 | function Perlin.generate() 13 | for i=0,PERLIN_SIZE-1 do 14 | perlin.rands[i] = vec3.unit(vec3{2*math.random()-1, 2*math.random()-1, 2*math.random()-1}) 15 | end 16 | end 17 | 18 | function Perlin.permute(perm: *[PERLIN_SIZE]integer) 19 | for i=0,PERLIN_SIZE-1 do 20 | perm[i] = i 21 | end 22 | for i=PERLIN_SIZE-1,1,-1 do 23 | local target = math.random(0, i) 24 | perm[i], perm[target] = perm[target], perm[i] 25 | end 26 | end 27 | 28 | local function trilinear_interp(c: [2][2][2]vec3, u: number, v: number, w: number) 29 | u, v, w = u*u*(3-2*u), v*v*(3-2*v), w*w*(3-2*w) 30 | local accum: number = 0 31 | for i=0,1 do 32 | for j=0,1 do 33 | for k=0,1 do 34 | local weight = vec3{u-i, v-j, w-k} 35 | accum = accum + 36 | ((i*u) + (1-i)*(1-u))* 37 | ((j*v) + (1-j)*(1-v))* 38 | ((k*w) + (1-k)*(1-w))* 39 | vec3.dot(c[i][j][k], weight) 40 | end 41 | end 42 | end 43 | return accum 44 | end 45 | 46 | function Perlin.noise(p: vec3): number 47 | local u, v, w = p.x - math.floor(p.x), p.y - math.floor(p.y), p.z - math.floor(p.z) 48 | local pi, pj, pk = (@integer)(math.floor(p.x)), (@integer)(math.floor(p.y)), (@integer)(math.floor(p.z)) 49 | local c: [2][2][2]vec3 50 | for i=0,1 do 51 | for j=0,1 do 52 | for k=0,1 do 53 | c[i][j][k] = perlin.rands[ 54 | perlin.permx[(pi+i) & 255] ~ 55 | perlin.permy[(pj+j) & 255] ~ 56 | perlin.permx[(pk+k) & 255]] 57 | end 58 | end 59 | end 60 | return trilinear_interp(c, u, v, w) 61 | end 62 | 63 | function Perlin.turb(p: vec3, depth: integer) 64 | local accum: number = 0 65 | local weight: number = 1 66 | for i=0,depth-1 do 67 | accum = accum + weight * Perlin.noise(p) 68 | weight = weight * 0.5 69 | p = p + p 70 | end 71 | return math.abs(accum) 72 | end 73 | 74 | Perlin.generate() 75 | Perlin.permute(perlin.permx) 76 | Perlin.permute(perlin.permy) 77 | Perlin.permute(perlin.permz) 78 | -------------------------------------------------------------------------------- /ray.nelua: -------------------------------------------------------------------------------- 1 | global Ray = @record{ 2 | origin: vec3, 3 | direction: vec3 4 | } 5 | 6 | function Ray:pointat(t: number): vec3 7 | return self.origin + self.direction * t 8 | end 9 | -------------------------------------------------------------------------------- /sdf2d.nelua: -------------------------------------------------------------------------------- 1 | ##[[ 2 | --OPENMP = true 3 | --EMSCRIPTEN = true 4 | ]] 5 | 6 | require 'config' 7 | require 'mathx' 8 | require 'vec2' 9 | require 'vec3' 10 | require 'argbcolor' 11 | require 'sdl2' 12 | require 'window' 13 | 14 | local SCREEN_WIDTH = 512 15 | local SCREEN_HEIGHT = 512 16 | local SCREEN_SCALE = 1 17 | local pixels: [SCREEN_HEIGHT][SCREEN_WIDTH]argbcolor 18 | local iResolution = vec2{SCREEN_WIDTH, SCREEN_HEIGHT} 19 | local iInvResolution = vec2{1/SCREEN_WIDTH, 1/SCREEN_HEIGHT} 20 | local iTime: number 21 | local window: Window 22 | local lastticks = SDL_GetTicks() 23 | local fps = 0 24 | local quit = false 25 | 26 | local function sd_circle(p: vec2, r: number): number 27 | return #p - r 28 | end 29 | 30 | local function sd_vline(p: vec2, r: number): number 31 | return math.abs(p.x) - r 32 | end 33 | 34 | local function sd_box(p: vec2, r: vec2): number 35 | local d = vec2.abs(p) - r 36 | return # (vec2.max(d, vec2{0,0})) + math.min(math.max(d.x,d.y), 0.0) 37 | end 38 | 39 | local function map(p: vec2): number 40 | local d: number 41 | p = p * 10.0 42 | d = sd_circle(p - vec2{-10.0*math.fastsin(iTime),5.0}, 1.0) 43 | d = math.min(d, sd_vline(p - vec2{-5.0,5.0}, 1.0)) 44 | d = math.min(d, sd_box(p - vec2{0.0,5.0}, vec2{2.0,2.0})) 45 | d = d * (1.0/10.0) 46 | return d 47 | end 48 | 49 | local function get_distance_field_color(d: number) 50 | local outcolor = vec3{0.9,0.6,0.3} 51 | local incolor = vec3{0.3,0.6,0.9} 52 | local boundcolor = vec3{1.0,1.0,1.0} 53 | local linechange = 0.2 54 | local numlines = 120.0 55 | local linesmooth = 0.5 56 | local linestep = math.smoothstep(-linesmooth, linesmooth, math.fastsin(d*numlines))*2.0 - 1.0 57 | local brightness = (1.0-linechange) + linechange*linestep 58 | local decay = math.fastexp4(-math.abs(d)) 59 | local colfield = vec3.lerp(incolor, outcolor, math.step(0.0, d)) * (brightness * decay) 60 | local colbound = boundcolor * math.fastexp4(-(numlines*0.5)*math.abs(d)) 61 | return colfield + colbound 62 | end 63 | 64 | local function main_image(fragcoord: vec2) 65 | local uv = (2.0 * fragcoord - iResolution) *iInvResolution.y 66 | local d = map(uv) * 1.0 67 | local col = get_distance_field_color(d) 68 | return col 69 | --[[ 70 | local uv = vec2.div(fragcoord, iResolution) 71 | local col = vec3{uv.x,uv.y,uv.x} + vec3{0,2,4} 72 | col = col + iTime 73 | col = vec3{math.fastcos(col.x),math.fastcos(col.y),math.fastcos(col.z)} 74 | col = col * 0.5 75 | col = col + 0.5 76 | return col 77 | ]] 78 | end 79 | 80 | local function draw() 81 | ##[[if OPENMP then 82 | cemit '#pragma omp parallel for schedule(dynamic)' 83 | end]] 84 | for y=0,= 1000 then 107 | print('FPS', fps) 108 | lastticks = ticks 109 | fps = 0 110 | end 111 | 112 | poll_events() 113 | draw() 114 | fps = fps + 1 115 | end 116 | 117 | local function emframe(context: pointer) 118 | frame() 119 | end 120 | 121 | local function go() 122 | window = Window.create(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_SCALE) 123 | 124 | ## if not EMSCRIPTEN then 125 | repeat 126 | frame() 127 | until quit 128 | 129 | window:destroy() 130 | ## else 131 | ## cemit 'emscripten_set_main_loop_arg(emframe, 0, -1, 1);' 132 | ## end 133 | end 134 | 135 | go() 136 | -------------------------------------------------------------------------------- /sphere.nelua: -------------------------------------------------------------------------------- 1 | global Sphere = @record{ 2 | center: vec3, 3 | _radius2: number, 4 | _invradius: number, 5 | radius: number, 6 | mat: Material 7 | } 8 | 9 | function Sphere.get_uv(p: vec3): vec2 10 | local phi = math.atan(p.z, p.x) 11 | local theta = math.asin(p.y) 12 | return vec2{1 - ((phi + math.pi) / math.tau), (theta + math.pi/2) / math.pi } 13 | end 14 | 15 | function Sphere:update() 16 | self._invradius = 1 / self.radius 17 | self._radius2 = self.radius*self.radius 18 | end 19 | 20 | function Sphere:hit(r: Ray, tmin: number, tmax: number): (boolean, Hit) 21 | local oc = r.origin - self.center 22 | local b = vec3.dot(oc, r.direction) 23 | local c = vec3.squaredlength(oc) - self._radius2 24 | local discriminant = b*b - c 25 | local rec: Hit 26 | local t: number 27 | if discriminant > 0 then 28 | local droot = math.sqrt(discriminant) 29 | local t1 = -b 30 | local t2 = droot 31 | t = t1 - t2 32 | if t < tmax and t > tmin then 33 | goto hitted 34 | end 35 | t = t1 + t2 36 | if t < tmax and t > tmin then 37 | goto hitted 38 | end 39 | end 40 | do return false, rec end 41 | ::hitted:: 42 | rec.p = r:pointat(t) 43 | rec.normal = (rec.p - self.center) * self._invradius 44 | rec.uv = Sphere.get_uv(rec.normal) 45 | rec.mat = &self.mat 46 | rec.t = t 47 | return true, rec 48 | end 49 | -------------------------------------------------------------------------------- /texture.nelua: -------------------------------------------------------------------------------- 1 | global TEXTURES = @enum { 2 | COLOR = 0, 3 | CHECKER = 1, 4 | NOISE = 2, 5 | } 6 | 7 | global Texture = @record { 8 | kind: TEXTURES, 9 | diffuse_color: vec3, 10 | scale: number 11 | } 12 | 13 | function Texture:color_color(uv: vec2, p: vec3): vec3 14 | return self.diffuse_color 15 | end 16 | 17 | function Texture:checker_color(uv: vec2, p: vec3): vec3 18 | local sines = math.fastsin(10*p.x)*math.fastsin(10*p.y)*math.fastsin(10*p.z) 19 | if sines < 0 then 20 | return vec3{1,1,1} 21 | else 22 | return self.diffuse_color 23 | end 24 | end 25 | 26 | function Texture:noise_color(uv: vec2, p: vec3): vec3 27 | local noise = Perlin.turb(p * self.scale, 2)*0.5+0.5 28 | return self.diffuse_color * noise 29 | end 30 | 31 | function Texture:color(uv: vec2, p: vec3): vec3 32 | switch self.kind 33 | case TEXTURES.COLOR then 34 | return Texture.color_color(self, uv, p) 35 | case TEXTURES.CHECKER then 36 | return Texture.checker_color(self, uv, p) 37 | case TEXTURES.NOISE then 38 | return Texture.noise_color(self, uv, p) 39 | end 40 | return vec3{} 41 | end 42 | -------------------------------------------------------------------------------- /vec2.nelua: -------------------------------------------------------------------------------- 1 | global vec2 = @record { 2 | x: number, 3 | y: number 4 | } 5 | ## vec2.value.is_vec2 = true 6 | 7 | local is_vec2_or_scalar = #[concept(function(b) 8 | return b.type.is_vec2 or b.type.is_scalar 9 | end)]# 10 | 11 | function vec2.__add(a: is_vec2_or_scalar, b: is_vec2_or_scalar): vec2 12 | ## if b.type.is_scalar then 13 | return vec2{a.x + b, a.y + b} 14 | ## elseif a.type.is_scalar then 15 | return vec2{a + b.x, a + b.y} 16 | ## else 17 | return vec2{a.x + b.x, a.y + b.y} 18 | ## end 19 | end 20 | 21 | function vec2.__sub(a: is_vec2_or_scalar, b: is_vec2_or_scalar): vec2 22 | ## if b.type.is_scalar then 23 | return vec2{a.x - b, a.y - b} 24 | ## elseif a.type.is_scalar then 25 | return vec2{a - b.x, a - b.y} 26 | ## else 27 | return vec2{a.x - b.x, a.y - b.y} 28 | ## end 29 | end 30 | 31 | function vec2.__mul(a: is_vec2_or_scalar, b: is_vec2_or_scalar): vec2 32 | ## if b.type.is_scalar then 33 | return vec2{a.x * b, a.y * b} 34 | ## elseif a.type.is_scalar then 35 | return vec2{a * b.x, a * b.y} 36 | ## else 37 | return vec2{a.x * b.x, a.y * b.y} 38 | ## end 39 | end 40 | 41 | function vec2.__div(a: is_vec2_or_scalar, b: is_vec2_or_scalar): vec2 42 | ## if b.type.is_scalar then 43 | local k: number = 1 / b 44 | return vec2{a.x * k, a.y * k} 45 | ## elseif a.type.is_scalar then 46 | local k: number = 1 / a 47 | return vec2{k * b.x, k * b.y} 48 | ## else 49 | return vec2{a.x / b.x, a.y / b.y} 50 | ## end 51 | end 52 | 53 | function vec2.__len(a: vec2): number 54 | return math.sqrt(a.x * a.x + a.y * a.y) 55 | end 56 | 57 | function vec2.abs(a: vec2): vec2 58 | return vec2{math.abs(a.x), math.abs(a.y)} 59 | end 60 | 61 | function vec2.max(a: vec2, b: vec2): vec2 62 | return vec2{math.max(a.x, b.x), math.max(a.y, b.y)} 63 | end 64 | -------------------------------------------------------------------------------- /vec3.nelua: -------------------------------------------------------------------------------- 1 | global vec3 = @record{ 2 | x: number, 3 | y: number, 4 | z: number 5 | } 6 | ## vec3.value.is_vec3 = true 7 | 8 | local is_vec3_or_scalar = #[concept(function(b) 9 | return b.type.is_vec3 or b.type.is_scalar 10 | end)]# 11 | 12 | function vec3.__add(a: is_vec3_or_scalar, b: is_vec3_or_scalar): vec3 13 | ## if b.type.is_scalar then 14 | return vec3{a.x+b, a.y+b, a.z+b} 15 | ## elseif a.type.is_scalar then 16 | return vec3{a+b.x, a+b.y, a+b.z} 17 | ## else 18 | return vec3{a.x+b.x, a.y+b.y, a.z+b.z} 19 | ## end 20 | end 21 | 22 | function vec3.__sub(a: is_vec3_or_scalar, b: is_vec3_or_scalar): vec3 23 | ## if b.type.is_scalar then 24 | return vec3{a.x-b, a.y-b, a.z-b} 25 | ## elseif a.type.is_scalar then 26 | return vec3{a-b.x, a-b.y, a-b.z} 27 | ## else 28 | return vec3{a.x-b.x, a.y-b.y, a.z-b.z} 29 | ## end 30 | end 31 | 32 | function vec3.__mul(a: is_vec3_or_scalar, b: is_vec3_or_scalar): vec3 33 | ## if b.type.is_scalar then 34 | return vec3{a.x*b, a.y*b, a.z*b} 35 | ## elseif a.type.is_scalar then 36 | return vec3{a*b.x, a*b.y, a*b.z} 37 | ## else 38 | return vec3{a.x*b.x, a.y*b.y, a.z*b.z} 39 | ## end 40 | end 41 | 42 | function vec3.__div(a: is_vec3_or_scalar, b: is_vec3_or_scalar): vec3 43 | ## if b.type.is_scalar then 44 | local k: number = 1 / b 45 | return vec3{a.x*k, a.y*k, a.z*k} 46 | ## elseif a.type.is_scalar then 47 | local k: number = 1 / a 48 | return vec3{k*b.x, k*b.y, k*b.z} 49 | ## else 50 | return vec3{a.x/b.x, a.y/b.y, a.z/b.z} 51 | ## end 52 | end 53 | 54 | function vec3.__unm(a: vec3): vec3 55 | return vec3{-a.x, -a.y, -a.z} 56 | end 57 | 58 | function vec3.min(a: vec3, b: vec3): vec3 59 | return vec3{math.min(a.x, b.x), math.min(a.y, b.y), math.min(a.z, b.z)} 60 | end 61 | 62 | function vec3.dot(a: vec3, b: vec3): number 63 | return a.x*b.x + a.y*b.y + a.z*b.z 64 | end 65 | 66 | function vec3.cross(a: vec3, b: vec3): vec3 67 | return vec3{a.y*b.z - a.z*b.y, a.z*b.x - a.x*b.z, a.x*b.y - a.y*b.x} 68 | end 69 | 70 | function vec3.sqrt(a: vec3): vec3 71 | return vec3{math.sqrt(a.x), math.sqrt(a.y), math.sqrt(a.z)} 72 | end 73 | 74 | function vec3.squaredlength(v: vec3): number 75 | return v.x*v.x + v.y*v.y + v.z*v.z 76 | end 77 | 78 | function vec3.length(v: vec3): number 79 | return math.sqrt(vec3.squaredlength(v)) 80 | end 81 | 82 | function vec3.__len(v: vec3): number 83 | return math.sqrt(vec3.squaredlength(v)) 84 | end 85 | 86 | function vec3.unit(v: vec3): vec3 87 | return v / #v 88 | end 89 | 90 | function vec3.lerp(a: vec3, b: vec3, t: number): vec3 91 | return a * (1-t) + b * t 92 | end 93 | 94 | function vec3.print(v: vec3) 95 | print(v.x, v.y, v.z) 96 | end 97 | 98 | function vec3.rotvec(v: vec3, axis: vec3, theta: number): vec3 99 | local n = vec3.unit(axis) 100 | local w = vec3.cross(n, v) 101 | local sint, cost = math.sin(theta), math.cos(theta) 102 | local ns = vec3.dot(v, n) * (1 - cost) 103 | return n * ns + w * sint + v * cost 104 | end 105 | 106 | function vec3.random_in_disk(length: number): vec3 107 | local theta = math.fastrand()*math.tau 108 | local sint, cost = math.sin(theta), math.cos(theta) 109 | local rlen = math.sqrt(math.fastrand())*length 110 | return vec3{rlen*cost, rlen*sint, 0} 111 | end 112 | 113 | function vec3.random_in_hemisphere(n: vec3) 114 | local theta, len = math.fastrand()*math.tau, math.fastrand() 115 | local w 116 | if math.abs(n.y) > 0.5 then 117 | w = vec3{1,0,0} 118 | else 119 | w = vec3{0,1,0} 120 | end 121 | local u = vec3.unit(vec3.cross(n, w)) 122 | local v = vec3.cross(u, n) 123 | local sint, cost = math.sin(theta), math.cos(theta) 124 | local r = math.sqrt(len) 125 | local rx, ry, rz = r*cost, r*sint, math.sqrt(1 - len) 126 | local rr = u * rx + v * ry + n * rz 127 | return vec3.unit(rr) 128 | end 129 | -------------------------------------------------------------------------------- /window.nelua: -------------------------------------------------------------------------------- 1 | global Window = @record { 2 | window: *SDL_Window, 3 | renderer: *SDL_Renderer, 4 | texture: *SDL_Texture, 5 | width: integer, 6 | height: integer, 7 | pitch: cint 8 | } 9 | 10 | function Window.create(width: integer, height: integer, scale: integer): Window 11 | -- SDL_SetHint('SDL_FRAMEBUFFER_ACCELERATION', '0') 12 | -- SDL_SetHint('SDL_HINT_RENDER_SCALE_QUALITY', 'linear') 13 | -- SDL_SetHint('SDL_HINT_RENDER_DRIVER', "opengl"); 14 | SDL_Init(SDL_INIT_VIDEO) 15 | 16 | local window = SDL_CreateWindow("An SDL2 Window", 17 | SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 18 | width * scale, height * scale, SDL_WINDOW_OPENGL) 19 | assert(window, "Could not create window") 20 | 21 | local renderer = SDL_CreateRenderer(window, -1, 0) 22 | assert(renderer, "Could not create renderer") 23 | -- SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE) 24 | 25 | local texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_XBGR8888, SDL_TEXTUREACCESS_STREAMING, width, height) 26 | -- SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_NONE) 27 | 28 | return Window{window, renderer, texture, width, height, width*4} 29 | end 30 | 31 | function Window.destroy(self: *Window) 32 | SDL_DestroyTexture(self.texture) 33 | SDL_DestroyRenderer(self.renderer) 34 | SDL_DestroyWindow(self.window) 35 | SDL_Quit() 36 | end 37 | 38 | function Window.uploadpixels(self: *Window, pixels: *argbcolor) 39 | SDL_UpdateTexture(self.texture, nilptr, pixels, self.pitch) 40 | SDL_RenderCopy(self.renderer, self.texture, nilptr, nilptr) 41 | SDL_RenderPresent(self.renderer) 42 | end 43 | --------------------------------------------------------------------------------