Ignacio Castaño castano

castano / Sphere.cpp

Last active May 17, 2023 00:37

	// This code is in the public domain -- Ignacio Castaño <[email protected]>

	#include "Sphere.h"
	#include "Vector.inl"
	#include "Box.inl"

	#include <float.h> // FLT_MAX

	using namespace nv;

castano / gist:b05863af48138dab368b23a0ab86e735

Created March 30, 2017 22:54

Least Squares Vertex Quantization

	I didn't think there was much to gain from optimizing quantization intervals for vertex compression, but I thought it would give it a try and see it for myself.

	I have a set of vertices X that I want to quantize. The trivial way to do that is to transform them to the [0,1] range and store them using an integer UNORM format.

	At runtime the vertices are reconstructed as follows:

	X = Q * m + a

	Where:

castano / hemicube.cpp

Created June 20, 2014 09:46

Hemicube Integrator


	#include "hemicube.h"

	#define PACK_HEMICUBES 1


	static void get_hemicube_face_normal(int index, Vector3 forward, Vector3 left, Vector3 *up) {
	// Unwrapped hemicube with positive-Z in the middle.
	switch (index) {
	case 0: forward = Vector3(+1, 0, 0); left = Vector3( 0, 1, 0); break;

castano / scope.cpp

Created July 24, 2013 23:49

Various ways to emulate D's scope statements in C++. See http://the-witness.net/news/2012/11/scopeexit-in-c11/

	// For C++11 support compile with:
	// clang++ -std=c++11 -stdlib=libc++ scope.cpp

	#include <stdio.h>
	#include <stdlib.h>

	template <typename F>
	struct ScopeExit {
	ScopeExit(F f) : f(f) {}
	~ScopeExit() { f(); }

castano / BSpline.cpp

Created June 15, 2012 19:13

Old b-spline interpolation and approximation code

castano / half_to_float_test.cpp

Created March 21, 2012 18:27

ISPC half to float conversion

	#include <intrin.h> // __rdtsc
	#include <stdio.h>

	typedef unsigned int uint;
	typedef unsigned short uint16;
	typedef unsigned long long uint64;

	// ISPC functions:
	extern "C" void half_to_float_test(const uint16 * vin, float * vout, int count);
	extern "C" void half_to_float_test_fast(const uint16 * vin, float * vout, int count);