Viewer for timestep data such as molecular dynamics

README.md

+This repository contains the demos for HTC vive using openvr version 0.9.19
+https://github.com/ValveSoftware/openvr
+
+Clone that repository and add the content of this one inside the samples directory.
+
+List of directories
+TimestepData: 
+	Loads prepared molecular dynamics simulations

TimestepData/hellovr_opengl.sln

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TimestepData/hellovr_opengl_main.cpp

+//========= Copyright Valve Corporation ============//
+
+/*#define _CRTDBG_MAP_ALLOC
+#include <stdlib.h>
+#include <crtdbg.h>
+#define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
+#define new DEBUG_NEW
+*/
+
+#include <SDL.h>
+#include <GL/glew.h>
+#include <SDL_opengl.h>
+#include <gl/glu.h>
+#include <stdio.h>
+#include <string>
+#include <cstdlib>
+
+#include <openvr.h>
+
+#include "shared/lodepng.h"
+#include "shared/Matrices.h"
+#include "shared/pathtools.h"
+
+#include "rply.h"
+
+static int vertex_cb(p_ply_argument argument);
+static int face_cb(p_ply_argument argument);
+
+static float *CubeVertices;
+static int *CubeIndices;
+static int CurrentVertex;
+static int CurrentIndex;
+
+
+
+static float BACKGROUND[3];
+static const char * PATH;
+static int ISOS;
+static int TIMESTEPS;
+static float **isocolours; // [ISOS][4];
+const char **plyfiles;
+static float **translations;
+static float userpos[3];
+
+//#define LOCALTEST
+
+/*#ifdef LOCALTEST
+#define PATH "Y:\\v2t\\datasets\\mpcdf_CO2_CaO\\cubes-bigger\\IsosurfacesFixed\\"
+#else
+#define PATH "data\\CO2-CaO-B\\"
+//#define PATH "C:\\Users\\mobile\\Desktop\\openvrDemos\\win64\\data\\CO2-CaO-B\\"
+#endif
+*/
+#define ZLAYERS 12
+
+//number of components in our vertices data xyz+nxnynz+rgba
+#define numComponents 10
+
+#define MAXGPU 300
+//use 32 or 16 bits for index (in case more than 64k vertices / mesh
+#define INDICESGL32 
+
+//isosurfaces (or meshes such as atoms etc)
+//#define ISOS 5
+
+//shown on https://www.vbw-bayern.de/vbw/Aktionsfelder/Innovation-F-T/Forschung-und-Technologie/Zukunft-digital-Big-Data.jsp
+
+#define GRID 1
+#define GRIDSTR "1"
+#define NUMLODS 1
+
+/*#ifndef LOCALTEST
+#define TIMESTEPS 423
+#else
+#define TIMESTEPS 1
+#endif*/
+
+#define NUMPLY (TIMESTEPS * ISOS)
+
+
+//http://stackoverflow.com/questions/3018313/algorithm-to-convert-rgb-to-hsv-and-hsv-to-rgb-in-range-0-255-for-both
+void hsv2rgb(float *hsv, float *rgb) {
+	float h = hsv[0], s = hsv[1], v = hsv[2], p, q, t, f, r, g, b;
+
+	(h == 360.) ? (h = 0.) : (h /= 60.);
+	f = h - floor(h);
+
+	p = v*(1.f - s);
+	q = v*(1.f - s*f);
+	t = v*(1.f - s*(1.f - f));
+
+	if (0. <= h && h < 1.){
+		r = v; g = t; b = p;
+	}	else if (1. <= h && h < 2.) {
+		r = q; g = v; b = p;
+	}	else if (2. <= h && h < 3.){
+		r = p; g = v; b = t;
+	}else if (3. <= h && h < 4.){
+		r = p; g = q; b = v;
+	}else if (4. <= h && h < 5.){
+		r = t; g = p; b = v;
+	}else if (5. <= h && h < 6.){
+		r = v; g = p;b = q;
+	}
+	else{
+		r = 0.; g = 0.; b = 0.;
+	}
+	rgb[0] = r; rgb[1] = g; rgb[2] = b;
+}
+
+
+class CGLRenderModel
+{
+public:
+	CGLRenderModel( const std::string & sRenderModelName );
+	~CGLRenderModel();
+
+	bool BInit( const vr::RenderModel_t & vrModel, const vr::RenderModel_TextureMap_t & vrDiffuseTexture );
+	void Cleanup();
+	void Draw();
+	const std::string & GetName() const { return m_sModelName; }
+
+private:
+	GLuint m_glVertBuffer;
+	GLuint m_glIndexBuffer;
+	GLuint m_glVertArray;
+	GLuint m_glTexture;
+	GLsizei m_unVertexCount;
+	std::string m_sModelName;
+};
+
+static bool g_bPrintf = true;
+
+//-----------------------------------------------------------------------------
+// Purpose:
+//------------------------------------------------------------------------------
+class CMainApplication
+{
+public:
+	CMainApplication(int argc, char *argv[]);
+	virtual ~CMainApplication();
+
+	bool BInit();
+	bool BInitGL();
+	bool BInitCompositor();
+
+	void SetupRenderModels();
+
+	void Shutdown();
+
+	void RunMainLoop();
+	bool HandleInput();
+	void ProcessVREvent(const vr::VREvent_t & event);
+	void RenderFrame();
+
+	bool SetupTexturemaps();
+	bool SetupDepthPeeling();
+
+	void SetupScene();
+	bool AddModelToScene(Matrix4 mat, std::vector<float> &vertdata, 
+#ifndef INDICESGL32
+		std::vector<short> & vertindices, 
+#else
+		std::vector<GLuint> & vertindices,
+#endif
+		const char *const data, bool water, bool colours, int set);
+
+	void DrawControllers();
+
+	bool SetupStereoRenderTargets();
+	void SetupDistortion();
+	void SetupCameras();
+
+	void RenderStereoTargets();
+	void RenderDistortion();
+	void RenderScene(vr::Hmd_Eye nEye);
+
+	Matrix4 GetHMDMatrixProjectionEye(vr::Hmd_Eye nEye);
+	Matrix4 GetHMDMatrixPoseEye(vr::Hmd_Eye nEye);
+	Matrix4 GetCurrentViewProjectionMatrix(vr::Hmd_Eye nEye);
+	void UpdateHMDMatrixPose();
+
+	Matrix4 ConvertSteamVRMatrixToMatrix4(const vr::HmdMatrix34_t &matPose);
+
+	GLuint CompileGLShader(const char *pchShaderName, const char *pchVertexShader, const char *pchFragmentShader);
+	bool CreateAllShaders();
+
+	void SetupRenderModelForTrackedDevice(vr::TrackedDeviceIndex_t unTrackedDeviceIndex);
+	CGLRenderModel *FindOrLoadRenderModel(const char *pchRenderModelName);
+	void RenderAllTrackedRenderModels(vr::Hmd_Eye nEye);
+private:
+	bool m_bDebugOpenGL;
+	bool m_bVerbose;
+	bool m_bPerf;
+	bool m_bVblank;
+	bool m_bGlFinishHack;
+
+	vr::IVRSystem *m_pHMD;
+	vr::IVRRenderModels *m_pRenderModels;
+	std::string m_strDriver;
+	std::string m_strDisplay;
+	vr::TrackedDevicePose_t m_rTrackedDevicePose[vr::k_unMaxTrackedDeviceCount];
+	Matrix4 m_rmat4DevicePose[vr::k_unMaxTrackedDeviceCount];
+	bool m_rbShowTrackedDevice[vr::k_unMaxTrackedDeviceCount];
+
+	std::vector<float> **vertdataarray; //[LOD][PLY]
+#ifndef INDICESGL32
+	std::vector<short> **vertindicesarray;//[LOD][PLY]
+#else
+	std::vector<GLuint> **vertindicesarray;//[LOD][PLY]
+#endif
+private: // SDL bookkeeping
+	SDL_Window *m_pWindow;
+	uint32_t m_nWindowWidth;
+	uint32_t m_nWindowHeight;
+
+	SDL_GLContext m_pContext;
+
+	void PaintGrid(const vr::Hmd_Eye &nEye, const int iso);
+
+private: // OpenGL bookkeeping
+	int m_iTrackedControllerCount;
+	int m_iTrackedControllerCount_Last;
+	int m_iValidPoseCount;
+	int m_iValidPoseCount_Last;
+	bool m_bShowCubes;
+	bool buttonPressed[2][vr::k_unMaxTrackedDeviceCount]; //grip, application menu
+	std::string m_strPoseClasses;                            // what classes we saw poses for this frame
+	char m_rDevClassChar[vr::k_unMaxTrackedDeviceCount];   // for each device, a character representing its class
+
+	int m_iSceneVolumeWidth;
+	int m_iSceneVolumeHeight;
+	int m_iSceneVolumeDepth;
+	float m_fScaleSpacing;
+	float m_fScale;
+
+	int m_iSceneVolumeInit;                                  // if you want something other than the default 20x20x20
+
+	float m_fNearClip;
+	float m_fFarClip;
+
+	GLuint *m_iTexture; //[3+ZLAYERS];
+	GLuint peelingFramebuffer;
+	unsigned int **m_uiVertcount;// [LODS][NUMPLY];
+
+	GLuint **m_glSceneVertBuffer; // [LODS][NUMPLY];
+	GLuint **m_unSceneVAO; //[LODS][NUMPLY];
+	GLuint **m_unSceneVAOIndices; //[LODS][NUMPLY];
+	int currentset;
+	float elapsedtime;
+	static const float videospeed;
+	int currentiso;
+	int firstdevice;
+	GLuint m_unLensVAO;
+	GLuint m_glIDVertBuffer;
+	GLuint m_glIDIndexBuffer;
+	unsigned int m_uiIndexSize;
+
+	GLuint m_glControllerVertBuffer;
+	GLuint m_unControllerVAO;
+	unsigned int m_uiControllerVertcount;
+
+	Matrix4 m_mat4HMDPose;
+	Matrix4 m_mat4eyePosLeft;
+	Matrix4 m_mat4eyePosRight;
+
+	Matrix4 m_mat4ProjectionCenter;
+	Matrix4 m_mat4ProjectionLeft;
+	Matrix4 m_mat4ProjectionRight;
+
+	Vector3 UserPosition;
+
+	struct VertexDataScene
+	{
+		Vector3 position;
+		Vector2 texCoord;
+	};
+
+	struct VertexDataLens
+	{
+		Vector2 position;
+		Vector2 texCoordRed;
+		Vector2 texCoordGreen;
+		Vector2 texCoordBlue;
+	};
+
+	GLuint m_unSceneProgramID;
+	GLuint m_unLensProgramID;
+	GLuint m_unControllerTransformProgramID;
+	GLuint m_unRenderModelProgramID;
+
+	GLint m_nSceneMatrixLocation;
+	GLint m_nBlendingIntLocation;
+	GLint m_nControllerMatrixLocation;
+	GLint m_nRenderModelMatrixLocation;
+
+	struct FramebufferDesc
+	{
+		GLuint m_nDepthBufferId;
+		GLuint m_nRenderTextureId;
+		GLuint m_nRenderFramebufferId;
+		GLuint m_nResolveTextureId;
+		GLuint m_nResolveFramebufferId;
+	};
+	FramebufferDesc leftEyeDesc;
+	FramebufferDesc rightEyeDesc;
+
+	bool CreateFrameBuffer( int nWidth, int nHeight, FramebufferDesc &framebufferDesc );
+	
+	uint32_t m_nRenderWidth;
+	uint32_t m_nRenderHeight;
+
+	std::vector< CGLRenderModel * > m_vecRenderModels;
+	CGLRenderModel *m_rTrackedDeviceToRenderModel[ vr::k_unMaxTrackedDeviceCount ];
+
+	char * pixels; //for saving screenshots to disk
+	int framecounter;