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FluorescentCIAAfricanAmerican
2020-04-22 12:56:21 -04:00
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tier2/camerautils.cpp Normal file
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================
#include "tier2/camerautils.h"
#include "tier0/dbg.h"
#include "mathlib/vector.h"
#include "mathlib/vmatrix.h"
#include "tier2/tier2.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
//-----------------------------------------------------------------------------
// accessors for generated matrices
//-----------------------------------------------------------------------------
void ComputeViewMatrix( matrix3x4_t *pWorldToCamera, const Camera_t &camera )
{
matrix3x4_t transform;
AngleMatrix( camera.m_angles, camera.m_origin, transform );
VMatrix matRotate( transform );
VMatrix matRotateZ;
MatrixBuildRotationAboutAxis( matRotateZ, Vector(0,0,1), -90 );
MatrixMultiply( matRotate, matRotateZ, matRotate );
VMatrix matRotateX;
MatrixBuildRotationAboutAxis( matRotateX, Vector(1,0,0), 90 );
MatrixMultiply( matRotate, matRotateX, matRotate );
transform = matRotate.As3x4();
MatrixInvert( transform, *pWorldToCamera );
}
void ComputeViewMatrix( VMatrix *pWorldToCamera, const Camera_t &camera )
{
matrix3x4_t transform, invTransform;
AngleMatrix( camera.m_angles, camera.m_origin, transform );
VMatrix matRotate( transform );
VMatrix matRotateZ;
MatrixBuildRotationAboutAxis( matRotateZ, Vector(0,0,1), -90 );
MatrixMultiply( matRotate, matRotateZ, matRotate );
VMatrix matRotateX;
MatrixBuildRotationAboutAxis( matRotateX, Vector(1,0,0), 90 );
MatrixMultiply( matRotate, matRotateX, matRotate );
transform = matRotate.As3x4();
MatrixInvert( transform, invTransform );
*pWorldToCamera = invTransform;
}
void ComputeProjectionMatrix( VMatrix *pCameraToProjection, const Camera_t &camera, int width, int height )
{
float flFOV = camera.m_flFOV;
float flZNear = camera.m_flZNear;
float flZFar = camera.m_flZFar;
float flApsectRatio = (float)width / (float)height;
// MatrixBuildPerspective( proj, flFOV, flFOV * flApsectRatio, flZNear, flZFar );
#if 1
float halfWidth = tan( flFOV * M_PI / 360.0 );
float halfHeight = halfWidth / flApsectRatio;
#else
float halfHeight = tan( flFOV * M_PI / 360.0 );
float halfWidth = flApsectRatio * halfHeight;
#endif
memset( pCameraToProjection, 0, sizeof( VMatrix ) );
pCameraToProjection->m[0][0] = 1.0f / halfWidth;
pCameraToProjection->m[1][1] = 1.0f / halfHeight;
pCameraToProjection->m[2][2] = flZFar / ( flZNear - flZFar );
pCameraToProjection->m[3][2] = -1.0f;
pCameraToProjection->m[2][3] = flZNear * flZFar / ( flZNear - flZFar );
}
//-----------------------------------------------------------------------------
// Computes the screen space position given a screen size
//-----------------------------------------------------------------------------
void ComputeScreenSpacePosition( Vector2D *pScreenPosition, const Vector &vecWorldPosition,
const Camera_t &camera, int width, int height )
{
VMatrix view, proj, viewproj;
ComputeViewMatrix( &view, camera );
ComputeProjectionMatrix( &proj, camera, width, height );
MatrixMultiply( proj, view, viewproj );
Vector vecScreenPos;
Vector3DMultiplyPositionProjective( viewproj, vecWorldPosition, vecScreenPos );
pScreenPosition->x = ( vecScreenPos.x + 1.0f ) * width / 2.0f;
pScreenPosition->y = ( -vecScreenPos.y + 1.0f ) * height / 2.0f;
}