examples: add overflow protection in path_tracing.v, fix randomization
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62a872b8b5
commit
41e0561b05
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@ -236,11 +236,10 @@ fn intersect(r Ray, spheres &Sphere, nspheres int) (bool, f64, int){
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// some casual random function, try to avoid the 0
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// some casual random function, try to avoid the 0
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fn rand_f64() f64 {
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fn rand_f64() f64 {
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x := (rand.intn(cache_len)+1) & 0x3FFF_FFFF
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x := rand.u32() & 0x3FFF_FFFF
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return f64(x)/f64(0x3FFF_FFFF)
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return f64(x)/f64(0x3FFF_FFFF)
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}
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}
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const(
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const(
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cache_len = 65536 // the 2*pi angle will be splitted in 65536 part
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cache_len = 65536 // the 2*pi angle will be splitted in 65536 part
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cache_mask = cache_len - 1 // mask to speed-up the module process
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cache_mask = cache_len - 1 // mask to speed-up the module process
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@ -270,6 +269,10 @@ const (
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/******************* main function for the radiance calculation **************/
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/******************* main function for the radiance calculation **************/
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fn radiance(r Ray, depthi int, scene_id int) Vec {
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fn radiance(r Ray, depthi int, scene_id int) Vec {
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if depthi > 1024 {
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eprintln('depthi: $depthi')
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return Vec{}
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}
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sin_tab := &f64( tabs.sin_tab )
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sin_tab := &f64( tabs.sin_tab )
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cos_tab := &f64( tabs.cos_tab )
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cos_tab := &f64( tabs.cos_tab )
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mut depth := depthi // actual depth in the reflection tree
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mut depth := depthi // actual depth in the reflection tree
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@ -318,7 +321,7 @@ fn radiance(r Ray, depthi int, scene_id int) Vec {
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//r1 := f64(2.0 * math.pi) * rand_f64()
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//r1 := f64(2.0 * math.pi) * rand_f64()
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// tabbed speed-up
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// tabbed speed-up
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r1 := rand.intn(cache_len) & cache_mask
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r1 := rand.u32() & cache_mask
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r2 := rand_f64()
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r2 := rand_f64()
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r2s := math.sqrt(r2)
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r2s := math.sqrt(r2)
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