Mercurial > projects > ldc
annotate test/ray.d @ 94:61615fa85940 trunk
[svn r98] Added support for std.c.stdlib.alloca via pragma(LLVM_internal, "alloca").
Added support for array .sort and .reverse properties.
Fixed some bugs with pointer arithmetic.
Disabled some DMD AST optimizations that was messing things up, destroying valuable information.
Added a KDevelop project file, this is what I use for coding LLVMDC now :)
Other minor stuff.
| author | lindquist |
|---|---|
| date | Mon, 12 Nov 2007 06:32:46 +0100 |
| parents | 70d6113eeb8c |
| children |
| rev | line source |
|---|---|
| 92 | 1 //import std.stdio, std.math, std.string; |
| 2 //import tools.base; | |
| 3 | |
| 4 int atoi(char[] s) { | |
| 5 int i, fac=1; | |
| 6 bool neg = (s.length) && (s[0] == '-'); | |
| 7 char[] a = neg ? s[1..$] : s; | |
| 8 foreach_reverse(c; a) { | |
| 9 i += (c-'0') * fac; | |
| 10 fac *= 10; | |
| 11 } | |
| 12 return !neg ? i : -i; | |
| 13 } | |
| 14 | |
| 15 pragma(LLVM_internal, "intrinsic", "llvm.sqrt.f64") | |
| 16 double sqrt(double val); | |
| 17 | |
| 18 double delta; | |
| 19 static this() { delta=sqrt(real.epsilon); } | |
| 20 | |
| 21 struct Vec { | |
| 22 double x, y, z; | |
| 23 Vec opAdd(ref Vec other) { return Vec(x+other.x, y+other.y, z+other.z); } | |
| 24 Vec opSub(ref Vec other) { return Vec(x-other.x, y-other.y, z-other.z); } | |
| 25 Vec opMul(double a) { return Vec(x*a, y*a, z*a); } | |
| 26 double dot(ref Vec other) { return x*other.x+y*other.y+z*other.z; } | |
| 27 Vec unitise() { return opMul(1.0/sqrt(dot(*this))); } | |
| 28 } | |
| 29 | |
| 30 struct Pair(T, U) { T first; U second; } | |
| 31 typedef Pair!(double, Vec) Hit; | |
| 32 | |
| 33 struct Ray { Vec orig, dir; } | |
| 34 | |
| 35 class Scene { | |
| 36 //abstract void intersect(ref Hit, ref Ray); | |
| 37 void intersect(ref Hit, ref Ray) {} | |
| 38 } | |
| 39 | |
| 40 class Sphere : Scene { | |
| 41 Vec center; | |
| 42 double radius; | |
| 43 //mixin This!("center, radius"); | |
| 44 this(ref Vec c, double r) | |
| 45 { | |
| 46 center = c; | |
| 47 radius = r; | |
| 48 } | |
| 49 double ray_sphere(ref Ray ray) { | |
| 50 auto v = center - ray.orig, b = v.dot(ray.dir), disc=b*b - v.dot(v) + radius*radius; | |
| 51 if (disc < 0) return double.infinity; | |
| 52 auto d = sqrt(disc), t2 = b + d; | |
| 53 if (t2 < 0) return double.infinity; | |
| 54 auto t1 = b - d; | |
| 55 return (t1 > 0 ? t1 : t2); | |
| 56 } | |
| 57 void intersect(ref Hit hit, ref Ray ray) { | |
| 58 auto lambda = ray_sphere(ray); | |
| 59 if (lambda < hit.first) | |
| 60 hit = Hit(lambda, (ray.orig + lambda*ray.dir - center).unitise); | |
| 61 } | |
| 62 } | |
| 63 | |
| 64 class Group : Scene { | |
| 65 Sphere bound; | |
| 66 Scene[] children; | |
| 67 //mixin This!("bound, children"); | |
| 68 this (Sphere s, Scene[] c) | |
| 69 { | |
| 70 bound = s; | |
| 71 children = c; | |
| 72 } | |
| 73 void intersect(ref Hit hit, ref Ray ray) { | |
| 74 auto l = bound.ray_sphere(ray); | |
| 75 if (l < hit.first) foreach (child; children) child.intersect(hit, ray); | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 double ray_trace(ref Vec light, ref Ray ray, Scene s) { | |
| 80 auto hit=Hit(double.infinity, Vec(0, 0, 0)); | |
| 81 s.intersect(hit, ray); | |
| 82 if (hit.first == double.infinity) return 0.0; | |
| 83 auto g = hit.second.dot(light); | |
| 84 if (g >= 0) return 0.0; | |
| 85 auto p = ray.orig + ray.dir*hit.first + hit.second*delta; | |
| 86 auto hit2=Hit(double.infinity, Vec(0, 0, 0)); | |
| 87 s.intersect(hit2, Ray(p, light*-1.0)); | |
| 88 return (hit2.first < double.infinity ? 0 : -g); | |
| 89 } | |
| 90 | |
| 91 Scene create(int level, ref Vec c, double r) { | |
| 92 auto s = new Sphere(c, r); | |
| 93 if (level == 1) return s; | |
|
94
61615fa85940
[svn r98] Added support for std.c.stdlib.alloca via pragma(LLVM_internal, "alloca").
lindquist
parents:
92
diff
changeset
|
94 Scene[] children; |
|
61615fa85940
[svn r98] Added support for std.c.stdlib.alloca via pragma(LLVM_internal, "alloca").
lindquist
parents:
92
diff
changeset
|
95 children ~= s; |
| 92 | 96 double rn = 3*r/sqrt(12.0); |
| 97 for (int dz=-1; dz<=1; dz+=2) | |
| 98 for (int dx=-1; dx<=1; dx+=2) | |
| 99 children~=create(level-1, c + Vec(dx, 1, dz)*rn, r/2); | |
| 100 return new Group(new Sphere(c, 3*r), children); | |
| 101 } | |
| 102 | |
| 103 void main(string[] args) { | |
| 104 int level = (args.length==3 ? args[1].atoi() : 9), | |
| 105 n = (args.length==3 ? args[2].atoi() : 512), ss = 4; | |
| 106 auto light = Vec(-1, -3, 2).unitise(); | |
| 107 auto s=create(level, Vec(0, -1, 0), 1); | |
| 108 printf("P5\n%d %d\n255", n, n); | |
| 109 for (int y=n-1; y>=0; --y) | |
| 110 for (int x=0; x<n; ++x) { | |
| 111 double g=0; | |
| 112 for (int d=0; d<ss*ss; ++d) { | |
| 113 auto dir=Vec(x+(d%ss)*1.0/ss-n/2.0, y+(d/ss)*1.0/ss-n/2.0, n).unitise(); | |
| 114 g += ray_trace(light, Ray(Vec(0, 0, -4), dir), s); | |
| 115 } | |
| 116 printf("%c", cast(ubyte)(0.5 + 255.0 * g / (ss*ss))); | |
| 117 } | |
| 118 } |