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#ifndef CAMERA_UTIL_H
#define CAMERA_UTIL_H
#include "Runtime/Math/Matrix4x4.h"
#include "Runtime/Math/Rect.h"
#include "Runtime/Modules/ExportModules.h"
class GfxDevice;
class Vector3f;
class Plane;
void LoadPixelMatrix( const Rectf& screenRect, GfxDevice& device, bool setMatrix, bool invertYTexelOffset );
void CalcPixelMatrix (const Rectf& screenRect, Matrix4x4f &out);
void ApplyTexelOffsetsToPixelMatrix( bool invertYTexelOffset, Matrix4x4f& matrix );
void LoadFullScreenOrthoMatrix( float nearPlane = -1.0f, float farPlane = 100.0f, bool forceNoHalfTexelOffset = false );
void GetHalfTexelOffsets( float& outx, float& outy );
void SetupPixelCorrectCoordinates();
void RectfToViewport( const Rectf& r, int viewPort[4] );
void FlipScreenRectIfNeeded( const GfxDevice& device, int screenviewcoord[4] );
void SetGLViewport (const Rectf& pixelRect);
// World point to screen point
// p = world point
// outP = result (x, y = in pixels inside the viewport, z = world space distance from the camera)
//
// sets outP to (0,0,0) if fails.
bool CameraProject( const Vector3f& p, const Matrix4x4f& cameraToWorld, const Matrix4x4f& worldToClip, const int viewport[4], Vector3f& outP );
// Screen point to world point
// p = screen point (x, y = in pixels inside the viewport, z = world space distance from the camera)
//
// sets outP to (0,0,0) if fails.
bool CameraUnProject( const Vector3f& p, const Matrix4x4f& cameraToWorld, const Matrix4x4f& clipToWorld, const int viewport[4], Vector3f& outP );
// Extract frustum planes from Projection matrix
void EXPORT_COREMODULE ExtractProjectionPlanes (const Matrix4x4f& projection, Plane* planes);
void EXPORT_COREMODULE ExtractProjectionNearPlane (const Matrix4x4f& projection, Plane* outPlane);
void SetClippingPlaneShaderProps();
class DeviceMVPMatricesState {
public:
DeviceMVPMatricesState ();
~DeviceMVPMatricesState();
const Matrix4x4f& GetView() const { return m_View; }
const Matrix4x4f& GetProj() const { return m_Proj; }
private:
Matrix4x4f m_World, m_View, m_Proj;
};
class DeviceViewProjMatricesState {
public:
DeviceViewProjMatricesState ();
~DeviceViewProjMatricesState();
private:
Matrix4x4f m_View, m_Proj;
};
#endif
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