redgpu/bullet: Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.

examples/CommonInterfaces/CommonGraphicsAppInterface.h
302 строки8 KB
yunfeibai
Swap yaw and pitch in camera computation. Add functions to convert view matrix to camera position, and camera position to camera yaw pitch roll.
02 июн 2017, 01:30
02 июн 2017, 01:30e6d1a8c
#ifndef COMMON_GRAPHICS_APP_H
#define COMMON_GRAPHICS_APP_H



#include "Bullet3Common/b3Vector3.h"
#include "CommonRenderInterface.h"
#include "CommonWindowInterface.h"
#include "CommonCameraInterface.h"

struct DrawGridData
{
    int gridSize;
    float upOffset;
    int upAxis;
    float gridColor[4];

    DrawGridData(int upAxis=1)
    :gridSize(10),
    upOffset(0.001f),
    upAxis(upAxis)
    {
        gridColor[0] = 0.6f;
        gridColor[1] = 0.6f;
        gridColor[2] = 0.6f;
        gridColor[3] = 1.f;
    }
};

enum EnumSphereLevelOfDetail
{
	SPHERE_LOD_POINT_SPRITE=0,
	SPHERE_LOD_LOW,
	SPHERE_LOD_MEDIUM,
	SPHERE_LOD_HIGH,

};
struct CommonGraphicsApp
{
	enum drawText3DOption
	{
		eDrawText3D_OrtogonalFaceCamera=1,
		eDrawText3D_TrueType=2,
		eDrawText3D_TrackObject=4,
	};
	class CommonWindowInterface*	m_window;
	struct CommonRenderInterface*	m_renderer;
	struct CommonParameterInterface*	m_parameterInterface;
	struct Common2dCanvasInterface*	m_2dCanvasInterface;

	bool	m_leftMouseButton;
	bool	m_middleMouseButton;
	bool	m_rightMouseButton;
	float m_wheelMultiplier;
	float m_mouseMoveMultiplier;
	float	m_mouseXpos;
	float	m_mouseYpos;
	bool	m_mouseInitialized;
	float	m_backgroundColorRGB[3];

	CommonGraphicsApp()
		:m_window(0),
		m_renderer(0),
		m_parameterInterface(0),
		m_2dCanvasInterface(0),
		m_leftMouseButton(false),
		m_middleMouseButton(false),
		m_rightMouseButton(false),
		m_wheelMultiplier(0.01f),
		m_mouseMoveMultiplier(0.4f),
		m_mouseXpos(0.f),
		m_mouseYpos(0.f),
		m_mouseInitialized(false)
	{
		m_backgroundColorRGB[0] = 0.7;
		m_backgroundColorRGB[1] = 0.7;
		m_backgroundColorRGB[2] = 0.8;
	}
	virtual ~CommonGraphicsApp()
	{
	}

	virtual void dumpNextFrameToPng(const char* pngFilename){}
    virtual void dumpFramesToVideo(const char* mp4Filename){}
    
    virtual void getScreenPixels(unsigned char* rgbaBuffer, int bufferSizeInBytes, float* depthBuffer, int depthBufferSizeInBytes){}
    
	virtual void getBackgroundColor(float* red, float* green, float* blue) const
	{
		if (red)
			*red = m_backgroundColorRGB[0];
		if (green)
			*green = m_backgroundColorRGB[1];
		if (blue)
			*blue = m_backgroundColorRGB[2];
	}
	virtual void setBackgroundColor(float red, float green, float blue)
	{
		m_backgroundColorRGB[0] = red;
		m_backgroundColorRGB[1] = green;
		m_backgroundColorRGB[2] = blue;
	}
	virtual void setMouseWheelMultiplier(float mult)
	{
		m_wheelMultiplier = mult;
	}
	virtual float getMouseWheelMultiplier() const
	{
		return m_wheelMultiplier;
	}

	virtual void setMouseMoveMultiplier(float mult)
	{
		m_mouseMoveMultiplier = mult;
	}
	
	virtual float getMouseMoveMultiplier() const
	{
		return m_mouseMoveMultiplier;
	}

	

	virtual void drawGrid(DrawGridData data=DrawGridData()) = 0;
	virtual void setUpAxis(int axis) = 0;
	virtual int getUpAxis() const = 0;
	
	virtual void swapBuffer() = 0;
	virtual void drawText( const char* txt, int posX, int posY)
	{
		float size=1;
		float colorRGBA[4]={0,0,0,1};
		drawText(txt,posX,posY, size, colorRGBA);
	}

	virtual void drawText( const char* txt, int posX, int posY, float size)
	{
		float colorRGBA[4]={0,0,0,1};
		drawText(txt,posX,posY,size,colorRGBA);
	}
	virtual void drawText( const char* txt, int posX, int posY, float size, float colorRGBA[4]) = 0;
	virtual void drawText3D( const char* txt, float posX, float posY, float posZ, float size)=0;
	virtual void drawText3D( const char* txt, float position[3], float orientation[4], float color[4], float size, int optionFlag)=0;
	virtual void drawTexturedRect(float x0, float y0, float x1, float y1, float color[4], float u0,float v0, float u1, float v1, int useRGBA)=0;
	virtual int	registerCubeShape(float halfExtentsX,float halfExtentsY, float halfExtentsZ, int textureIndex = -1,  float textureScaling = 1)=0;
	virtual int	registerGraphicsUnitSphereShape(EnumSphereLevelOfDetail lod, int textureId=-1) = 0;
	

	virtual void registerGrid(int xres, int yres, float color0[4], float color1[4])=0;

	void defaultMouseButtonCallback( int button, int state, float x, float y)
	{
		if (button==0)
			m_leftMouseButton= (state==1);
		if (button==1)
			m_middleMouseButton= (state==1);

		if (button==2)
			m_rightMouseButton=	(state==1);

		m_mouseXpos = x;
		m_mouseYpos = y;
		m_mouseInitialized = true;
	}
	void defaultMouseMoveCallback(  float x, float y)
	{
		
		if (m_window && m_renderer)
		{
			CommonCameraInterface* camera = m_renderer->getActiveCamera();

			bool isAltPressed = m_window->isModifierKeyPressed(B3G_ALT);
			bool isControlPressed = m_window->isModifierKeyPressed(B3G_CONTROL);
			
			
			if (isAltPressed || isControlPressed)
			{
				float xDelta = x-m_mouseXpos;
				float yDelta = y-m_mouseYpos;
				float cameraDistance = camera->getCameraDistance();
				float pitch = camera->getCameraPitch();
				float yaw = camera->getCameraYaw();

				float targPos[3];
				float	camPos[3];

				camera->getCameraTargetPosition(targPos);
				camera->getCameraPosition(camPos);
			
				b3Vector3 cameraPosition = b3MakeVector3(b3Scalar(camPos[0]),
														b3Scalar(camPos[1]),
														b3Scalar(camPos[2]));

				b3Vector3 cameraTargetPosition = b3MakeVector3(	b3Scalar(targPos[0]),
																b3Scalar(targPos[1]),
																b3Scalar(targPos[2]));
				b3Vector3 cameraUp = b3MakeVector3(0,0,0);
				cameraUp[camera->getCameraUpAxis()] = 1.f;
							
				if (m_leftMouseButton)
				{
		//			if (b3Fabs(xDelta)>b3Fabs(yDelta))
		//			{
						pitch -= yDelta*m_mouseMoveMultiplier;
		//			} else
		//			{
						yaw -= xDelta*m_mouseMoveMultiplier;
		//			}
				}

				if (m_middleMouseButton)
				{
					cameraTargetPosition += cameraUp * yDelta*0.01;


					b3Vector3 fwd = cameraTargetPosition-cameraPosition;
					b3Vector3 side = cameraUp.cross(fwd);
					side.normalize();
					cameraTargetPosition += side * xDelta*0.01;

				}
				if (m_rightMouseButton)
				{
						cameraDistance -= xDelta*0.01f;
						cameraDistance -= yDelta*0.01f;
						if (cameraDistance<1)
							cameraDistance=1;
						if (cameraDistance>1000)
							cameraDistance=1000;
				}
				camera->setCameraDistance(cameraDistance);
				camera->setCameraPitch(pitch);
				camera->setCameraYaw(yaw);
				camera->setCameraTargetPosition(cameraTargetPosition[0],cameraTargetPosition[1],cameraTargetPosition[2]);
				
			}	

		}//m_window &&  m_renderer
		
		m_mouseXpos = x;
		m_mouseYpos = y;
		m_mouseInitialized = true;
	}
//	void defaultKeyboardCallback(int key, int state)
//	{
//	}
	void defaultWheelCallback( float deltax, float deltay)
	{

		if (m_renderer)
		{
			b3Vector3 cameraTargetPosition, cameraPosition, cameraUp = b3MakeVector3(0,0,0);
			cameraUp[getUpAxis()] = 1;
			CommonCameraInterface* camera = m_renderer->getActiveCamera();
			
			camera->getCameraPosition(cameraPosition);
			camera->getCameraTargetPosition(cameraTargetPosition);
			
			if (!m_leftMouseButton)
			{

				float cameraDistance = 	camera->getCameraDistance();
				if (deltay<0 || cameraDistance>1)
				{
					cameraDistance -= deltay*0.01f;
					if (cameraDistance<1)
						cameraDistance=1;
					camera->setCameraDistance(cameraDistance);

				} else
				{
					
					b3Vector3 fwd = cameraTargetPosition-cameraPosition;
					fwd.normalize();
					cameraTargetPosition += fwd*deltay*m_wheelMultiplier;//todo: expose it in the GUI?
				}
			} else
			{
				if (b3Fabs(deltax)>b3Fabs(deltay))
				{
					b3Vector3 fwd = cameraTargetPosition-cameraPosition;
					b3Vector3 side = cameraUp.cross(fwd);
					side.normalize();
					cameraTargetPosition += side * deltax*m_wheelMultiplier;

				} else
				{
					cameraTargetPosition -= cameraUp * deltay*m_wheelMultiplier;

				}
			}

			camera->setCameraTargetPosition(cameraTargetPosition[0],cameraTargetPosition[1],cameraTargetPosition[2]);
		}

	}


};


#endif //COMMON_GRAPHICS_APP_H