yorung’s gists

yorung / get_time.cpp

Last active August 29, 2015 14:22

GetTime using C++11

	#include <chrono>

	double GetTime()
	{
	static auto start = std::chrono::high_resolution_clock::now();
	auto now = std::chrono::high_resolution_clock::now();
	return std::chrono::duration_cast<std::chrono::duration<double, std::ratio<1, 1>>>(now - start).count();
	}

yorung / build.gradle

Last active August 29, 2015 14:22

build.gradle for std::chrono

yorung / layout_location.glsl

Created July 6, 2015 15:09

How to specify Input Layout Qualifiers

	#version 310 es

	layout(location = 0) in vec3 position;
	layout(location = 1) in vec3 normal;

yorung / how_to_bind.cpp

Last active August 29, 2015 14:24

How to use glBindAttribLocation

	static const int POSITION_INDEX = 0;
	static const int NORMAL_INDEX = 1;

	glBindAttribLocation(program, POSITION_INDEX, "position");
	glBindAttribLocation(program, NORMAL_INDEX, "normal");
	glLinkProgram(program);

yorung / query.cpp

Created July 6, 2015 15:22

How to query attribute location

	GLint positionIndex = glGetAttribLocation(program, "position");
	GLint normalIndex = glGetAttribLocation(program, "normal");

yorung / half_float_texture.cpp

Last active August 29, 2015 14:25

half float texture creating

	#ifdef OPENGL_OR_ES30
	// ES 3.0
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, w, h, 0, GL_RGBA, GL_HALF_FLOAT, nullptr);
	#else
	// ES 2.0
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_HALF_FLOAT_OES, nullptr);
	#endif

yorung / cubemap.hlsl

Last active August 16, 2017 16:04

a pixel shader for drawing background using a cubemap or photosphere

	cbuffer perObject : register(b0)
	{
	row_major matrix invVP;
	}

	TextureCube texCube : register(t0);
	SamplerState samplerState : register(s0);

	struct VsToPs
	{

yorung / little_planet.hlsl

Created August 21, 2015 11:47

Stereographic projection(Little Planet)

	float4 mainPS(VsToPs inp) : SV_Target
	{
	float2 scale = float2(4.0f / 3.0f, 1) * 3; // scale & aspect ratio
	float2 plane = inp.screenPos.xy * scale;
	float3 dir = float3(plane.x * 2, plane.y * 2, -1 + dot(plane, plane)) / (1 + dot(plane, plane));
	return texCube.Sample(samplerState, dir.xzy); // y is upper
	}

yorung / projection_equirectangular_to_stereographic.fx

Created August 21, 2015 11:56

A Stereographic Projection example using a Photo Sphere as source

	float4 mainPS(VsToPs inp) : SV_Target
	{
	float2 scale = float2(4.0f / 3.0f, 1) * 3; // scale & aspect ratio
	float2 plane = inp.screenPos.xy * scale;
	float3 dir = float3(plane.x * 2, plane.y * 2, -1 + dot(plane, plane)) / (1 + dot(plane, plane));

	dir = dir.xzy; // y is upper

	float longitude = atan2(dir.x, dir.z) * (180 / 3.14159265f);
	float latitude = asin(dir.y) * (180 / 3.14159265f);

yorung / dds_loader.cpp

Last active August 29, 2015 14:27

DDS Loader

	struct DDSHeader {
	uint32_t h3[3];
	int h, w;
	uint32_t h2[2];
	int mipCnt;
	uint32_t h13[13];
	uint32_t fourcc, bitsPerPixel, rMask, gMask, bMask, aMask, caps1, caps2;
	bool IsCubeMap() const { return caps2 == 0xFE00; }
	int GetArraySize() const { return IsCubeMap() ? 6 : 1; }
	int GetMipCnt() const { return std::max(mipCnt, 1); }

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