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[svn r181] Updated the raytracer demo by downs to work with tango :) My quick

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benchmarking shows it to be around 65% faster than DMD :D
This commit is contained in:
Tomas Lindquist Olsen
2008-05-05 22:20:07 +02:00
parent 071bf5a629
commit 2afd09b9e1
1 changed files with 12 additions and 3 deletions
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15
demos/ray.d
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@@ -1,4 +1,6 @@
import std.stdio;
import tango.stdc.stdio;
alias char[] string;
int atoi(char[] s) {
int i, fac=1;
@@ -11,8 +13,15 @@ int atoi(char[] s) {
return !neg ? i : -i;
}
version(LLVMDC)
{
pragma(LLVM_internal, "intrinsic", "llvm.sqrt.f64")
double sqrt(double val);
}
else
{
import tango.stdc.math;
}
double delta;
static this() { delta=sqrt(real.epsilon); }
@@ -104,13 +113,13 @@ void main(string[] args) {
n = (args.length==3 ? args[2].atoi() : 512), ss = 4;
auto light = Vec(-1, -3, 2).unitise();
auto s=create(level, Vec(0, -1, 0), 1);
writefln("P5\n", n, " ", n, "\n255");
printf("P5\n%d %d\n255", n,n);
for (int y=n-1; y>=0; --y)
for (int x=0; x<n; ++x) {
double g=0;
for (int d=0; d<ss*ss; ++d) {
auto dir=Vec(x+(d%ss)*1.0/ss-n/2.0, y+(d/ss)*1.0/ss-n/2.0, n).unitise();
g += ray_trace(light, Ray(Vec(0, 0, -4), dir), s);
g += ray_trace(light, Ray(Vec(0, 0, -4), dir), s);
}
printf("%c", cast(ubyte)(0.5 + 255.0 * g / (ss*ss)));
}