reinsteam’s gists

reinsteam / import_sdkmesh.h

Last active December 25, 2015 21:19

Sample of parsing Microsoft .sdkmesh format frequently used in samples

	#pragma once

	typedef unsigned long long u64;
	typedef unsigned int u32;
	typedef unsigned short u16;
	typedef unsigned char u8;
	typedef signed char i8;
	typedef float f32;

	#define MAX_PATH 260

reinsteam / tbn_from_quat.c

Last active October 15, 2020 03:05

Snippet to calculate TBN basis from quaternion in 8 instructions (seems like this one is used at Crytek: http://www.crytek.com/download/izfrey_siggraph2011.pdf)

	/*----------------------------------------------------------------------------------------------------------------------
	Custom cross-product: mad + mul
	----------------------------------------------------------------------------------------------------------------------*/
	half3 crs(half3 v0, half3 v1)
	{
	//return cross(v0, v1);
	half3 v0_0 = v0.yzx;
	half3 v0_1 = v1.zxy;
	half3 v1_0 = v0.zxy;
	half3 v1_1 = v1.yzx;

reinsteam / AoS2SoA.c

Last active August 29, 2015 14:13

AoS => SoA transformation for 3-component vectors

	/*----------------------------------------------------------------------------------------------------------------------
	input : srcStream => four 3-component vectors : x0y0z0 x1y1z1 x2y2z2 x3y3z3
	output : dstStream => three 4-component vectors : x0x1x2x3 y0y1y2y3 z0z1z2z3
	----------------------------------------------------------------------------------------------------------------------*/
	void AoS2SoA(float * __restrict dstStream, float const * __restrict srcStream)
	{
	__m128 x1_y1_z1_x2 = _mm_load_ps(srcStream + 0);
	__m128 y2_z2_x3_y3 = _mm_load_ps(srcStream + 4);
	__m128 z3_x4_y4_z4 = _mm_load_ps(srcStream + 8);

reinsteam / log2_avx2_packet.asm

Last active August 29, 2015 14:21

log2 computation (12-16 at a time) using SSE2/AVX2 instruction set based on minimax polynomial approximation (coefficients finding is based on Remez Exchange algorithm)

	.data

	cval_one DD 03f800000r ; 1
	DD 03f800000r ; 1
	DD 03f800000r ; 1
	DD 03f800000r ; 1
	DD 03f800000r ; 1
	DD 03f800000r ; 1
	DD 03f800000r ; 1
	DD 03f800000r ; 1

reinsteam / UnityMipColorsTexture.cs

Last active October 17, 2015 12:56

Snippet for generation helper texture for mip level colorization (http://aras-p.info/blog/2011/05/03/a-way-to-visualize-mip-levels/)

	static public Texture2D CreateMipColorsTexture()
	{
	var MipColorsTexture = new Texture2D(32, 32, TextureFormat.ARGB32, true);
	MipColorsTexture.hideFlags = HideFlags.HideAndDontSave;

	Color[] colorArray = new Color[6]
	{
	new Color(0.0f, 0.0f, 1.0f, 0.8f),
	new Color(0.0f, 0.5f, 1.0f, 0.4f),
	new Color(1.0f, 1.0f, 1.0f, 0.0f),

reinsteam / transpose_4x4_sse.c

Last active October 17, 2015 12:48

Alternative transpose methods comparing to _MM_TRANSPOSE4_PS defined in xmmintrin.h without shufps

	static void transpose_4x4_ver0(__m128 & v0, __m128 & v1, __m128 v2, __m128 v3)
	{
	__m128 a0 = _mm_unpacklo_ps(v0, v1); /* a0 = { x0, x1, y0, y1 } */
	__m128 a1 = _mm_unpackhi_ps(v0, v1); /* a1 = { z0, z1, z0, z1 } */

	__m128 a2 = _mm_unpacklo_ps(v2, v3); /* a2 = { x2, x3, y2, y3 } */
	__m128 a3 = _mm_unpackhi_ps(v2, v3); /* a3 = { z2, z3, z2, z3 } */

	v0 = _mm_unpacklo_ps(a0, a2); /* v0 = { x0, x1, x2, x3 } */
	v1 = _mm_unpackhi_ps(a0, a2); /* v1 = { y0, y1, y2, y3 } */

reinsteam / tundra_basic.lua

Created August 8, 2015 18:51

	Build
	{
	Units = function ()

	local prog = Program
	{
	Name = "project_name",
	Sources = { "main.c" },

	-- Place in MSVC solution folder.

reinsteam / BakeCubemap.cs

Created August 21, 2015 12:29

	using UnityEngine;
	using UnityEditor;
	using System.IO;

	public class BakeCubemap : ScriptableWizard
	{
	public Transform CapturePosition;

	public int Antialiasing = 4;
	public int CubemapResolution = 128;

reinsteam / enum_heaps.c

Created August 28, 2015 11:51

Sample code of heap enumeration without using Tool Help functions <tlhelp32.h>

	#ifndef WIN32_LEAN_AND_MEAN
	# define WIN32_LEAN_AND_MEAN
	#endif

	#pragma warning (push)
	/* 4820: '<struct-name>' : 'n' bytes padding added after data member '<member-name>'*/
	# pragma warning (disable : 4820)

	# include <windows.h>
	# include <stdio.h>

reinsteam / enum_volume.c

Created August 28, 2015 23:17

Sample code of volumes enumeration to get physical and logical sector alignment

	#pragma warning (push)
	/* 4820: '<struct-name>' : 'n' bytes padding added after data member '<member-name>'*/
	# pragma warning (disable : 4820)
	# pragma warning (disable : 4255 4668)
	# include <windows.h>
	# include <stdio.h>
	#pragma warning (pop)

	typedef unsigned u32;