mirror of
https://github.com/ptitSeb/Serious-Engine
synced 2024-11-26 20:25:54 +01:00
24cb244d43
This was a _ton_ of changes, made 15 years ago, so there are probably some problems to work out still. Among others: Engine/Base/Stream.* was mostly abandoned and will need to be re-ported. Still, this is a pretty good start, and probably holds a world record for lines of changes or something. :)
423 lines
13 KiB
C++
423 lines
13 KiB
C++
/* Copyright (c) 2002-2012 Croteam Ltd. All rights reserved. */
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#include "Engine/StdH.h"
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#include <Engine/Math/Projection.h>
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#include <Engine/Math/TextureMapping.h>
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#include <Engine/Math/OBBox.h>
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#include <Engine/Math/Geometry.inl>
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#include <Engine/Math/Clipping.inl>
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/////////////////////////////////////////////////////////////////////
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// CParallelProjection3D
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/*
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* Prepare for projecting.
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*/
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void CParallelProjection3D::Prepare(void)
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{
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FLOATmatrix3D t3dObjectStretch; // matrix for object stretch
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FLOATmatrix3D t3dObjectRotation; // matrix for object angles
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// calc. matrices for viewer and object angles and stretch
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MakeRotationMatrix(t3dObjectRotation, pr_ObjectPlacement.pl_OrientationAngle); // object normally
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MakeInverseRotationMatrix(pr_ViewerRotationMatrix, pr_ViewerPlacement.pl_OrientationAngle); // viewer inverse
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t3dObjectStretch.Diagonal(pr_ObjectStretch);
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pr_vViewerPosition = pr_ViewerPlacement.pl_PositionVector;
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BOOL bXInverted = pr_ObjectStretch(1)<0;
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BOOL bYInverted = pr_ObjectStretch(2)<0;
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BOOL bZInverted = pr_ObjectStretch(3)<0;
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pr_bInverted = bXInverted!=bYInverted!=bZInverted;
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// if the projection is mirrored
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if (pr_bMirror) {
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// reflect viewer
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ReflectPositionVectorByPlane(pr_plMirror, pr_vViewerPosition);
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ReflectRotationMatrixByPlane_rows(pr_plMirror, pr_ViewerRotationMatrix);
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// invert inversion
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pr_bInverted = !pr_bInverted;
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}
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// calculate screen center
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pr_ScreenCenter = pr_ScreenBBox.Center();
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// if the object is face-forward
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if (pr_bFaceForward) {
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// apply object stretch only
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pr_RotationMatrix = t3dObjectStretch;
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} else {
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// first apply object stretch then object rotation and then viewer rotation
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pr_mDirectionRotation = pr_ViewerRotationMatrix*t3dObjectRotation;
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pr_RotationMatrix = pr_mDirectionRotation*t3dObjectStretch;
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}
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// calc. offset of object from viewer
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pr_TranslationVector = pr_ObjectPlacement.pl_PositionVector - pr_vViewerPosition;
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// rotate offset only by viewer angles
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pr_TranslationVector = pr_TranslationVector*pr_ViewerRotationMatrix;
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// transform handle from object space to viewer space and add it to the offset
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pr_TranslationVector -= pr_vObjectHandle*pr_RotationMatrix;
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// calculate constant value used for calculating z-buffer k-value from vertex's z coordinate
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pr_fDepthBufferFactor = -pr_NearClipDistance;
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pr_fDepthBufferMul = (pr_fDepthBufferFar-pr_fDepthBufferNear);
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pr_fDepthBufferAdd = pr_fDepthBufferNear;
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// make clip planes
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MakeClipPlane(FLOAT3D(+pr_vZoomFactors(1),0,+pr_vStepFactors(1)), pr_ScreenBBox.Min()(1)-pr_ScreenCenter(1), pr_plClipL);
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MakeClipPlane(FLOAT3D(-pr_vZoomFactors(1),0,-pr_vStepFactors(1)), pr_ScreenCenter(1)-pr_ScreenBBox.Max()(1), pr_plClipR);
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MakeClipPlane(FLOAT3D(0,-pr_vZoomFactors(2),-pr_vStepFactors(2)), pr_ScreenBBox.Min()(2)-pr_ScreenCenter(2), pr_plClipU);
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MakeClipPlane(FLOAT3D(0,+pr_vZoomFactors(2),+pr_vStepFactors(2)), pr_ScreenCenter(2)-pr_ScreenBBox.Max()(2), pr_plClipD);
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// find vector in direction of viewing
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pr_vViewDirection = FLOAT3D(
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pr_vStepFactors(1)/pr_vZoomFactors(1),
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pr_vStepFactors(2)/pr_vZoomFactors(2),
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-1.0f);
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// mark as prepared
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pr_Prepared = TRUE;
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}
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/*
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* Project 3D object point into 3D view space, before clipping.
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*/
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void CParallelProjection3D::PreClip(const FLOAT3D &v3dObjectPoint,
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FLOAT3D &v3dTransformedPoint) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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// rotate and translate the point
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v3dTransformedPoint = v3dObjectPoint*pr_RotationMatrix + pr_TranslationVector;
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}
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/*
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* Project 3D object point into 3D view space, after clipping.
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*/
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void CParallelProjection3D::PostClip( const FLOAT3D &v3dTransformedPoint,
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FLOAT3D &v3dViewPoint) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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// multiply X and Y coordinates with zoom factor and add the center of screen
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v3dViewPoint(1) = pr_ScreenCenter(1)
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+ v3dTransformedPoint(1) *pr_vZoomFactors(1)
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+ v3dTransformedPoint(3) *pr_vStepFactors(1);
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v3dViewPoint(2) = pr_ScreenCenter(2)
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- v3dTransformedPoint(2) *pr_vZoomFactors(2)
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- v3dTransformedPoint(3) *pr_vStepFactors(2);
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}
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void CParallelProjection3D::PostClip( const FLOAT3D &v3dTransformedPoint, FLOAT fTransformedR,
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FLOAT3D &v3dViewPoint, FLOAT &fViewR) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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// multiply X and Y coordinates with zoom factor and add the center of screen
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v3dViewPoint(1) = pr_ScreenCenter(1)
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+ v3dTransformedPoint(1) *pr_vZoomFactors(1)
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+ v3dTransformedPoint(3) *pr_vStepFactors(1);
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v3dViewPoint(2) = pr_ScreenCenter(2)
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- v3dTransformedPoint(2) *pr_vZoomFactors(2)
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- v3dTransformedPoint(3) *pr_vStepFactors(2);
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fViewR = fTransformedR *pr_vZoomFactors(1);
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}
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/* Test if a sphere in view space is inside view frustum. */
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INDEX CParallelProjection3D::TestSphereToFrustum(const FLOAT3D &vViewPoint, FLOAT fRadius) const
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{
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ASSERT(pr_Prepared);
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const FLOAT fX = vViewPoint(1);
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const FLOAT fY = vViewPoint(2);
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const FLOAT fZ = vViewPoint(3);
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INDEX iPass = 1;
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// check to near
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if( fZ-fRadius>-pr_NearClipDistance) {
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return -1;
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} else if( fZ+fRadius>-pr_NearClipDistance) {
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iPass = 0;
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}
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// check to far
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if( pr_FarClipDistance>0) {
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if( fZ+fRadius<-pr_FarClipDistance) {
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return -1;
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} else if( fZ-fRadius<-pr_FarClipDistance) {
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iPass = 0;
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}
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}
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// check to left
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FLOAT fL = fX*pr_plClipL(1) + fZ*pr_plClipL(3) - pr_plClipL.Distance();
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if( fL<-fRadius) {
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return -1;
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} else if( fL<fRadius) {
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iPass = 0;
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}
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// check to right
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FLOAT fR = fX*pr_plClipR(1) + fZ*pr_plClipR(3) - pr_plClipR.Distance();
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if( fR<-fRadius) {
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return -1;
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} else if( fR<fRadius) {
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iPass = 0;
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}
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// check to up
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FLOAT fU = fY*pr_plClipU(2) + fZ*pr_plClipU(3) - pr_plClipU.Distance();
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if( fU<-fRadius) {
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return -1;
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} else if( fU<fRadius) {
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iPass = 0;
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}
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// check to down
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FLOAT fD = fY*pr_plClipD(2) + fZ*pr_plClipD(3) - pr_plClipD.Distance();
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if( fD<-fRadius) {
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return -1;
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} else if( fD<fRadius) {
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iPass = 0;
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}
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// all done
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return iPass;
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}
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/* Test if an oriented box in view space is inside view frustum. */
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INDEX CParallelProjection3D::TestBoxToFrustum(const FLOATobbox3D &box) const
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{
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ASSERT(pr_Prepared);
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INDEX iPass = 1;
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INDEX iTest;
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// check to near
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iTest = (INDEX) box.TestAgainstPlane(FLOATplane3D(FLOAT3D(0,0,-1), pr_NearClipDistance));
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if( iTest<0) {
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return -1;
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} else if( iTest==0) {
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iPass = 0;
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}
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// check to far
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if( pr_FarClipDistance>0) {
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iTest = (INDEX) box.TestAgainstPlane(FLOATplane3D(FLOAT3D(0,0,1), -pr_FarClipDistance));
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if( iTest<0) {
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return -1;
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} else if( iTest==0) {
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iPass = 0;
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}
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}
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// check to left
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iTest = (INDEX) box.TestAgainstPlane(pr_plClipL);
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if( iTest<0) {
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return -1;
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} else if( iTest==0) {
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iPass = 0;
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}
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// check to right
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iTest = (INDEX) box.TestAgainstPlane(pr_plClipR);
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if( iTest<0) {
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return -1;
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} else if( iTest==0) {
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iPass = 0;
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}
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// check to up
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iTest = (INDEX) box.TestAgainstPlane(pr_plClipU);
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if( iTest<0) {
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return -1;
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} else if( iTest==0) {
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iPass = 0;
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}
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// check to down
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iTest = (INDEX) box.TestAgainstPlane(pr_plClipD);
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if( iTest<0) {
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return -1;
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} else if( iTest==0) {
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iPass = 0;
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}
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// all done
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return iPass;
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}
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/*
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* Project 3D object point into 3D view space.
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*/
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void CParallelProjection3D::ProjectCoordinate(const FLOAT3D &v3dObjectPoint,
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FLOAT3D &v3dViewPoint) const
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{
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// rotate and translate the point
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v3dViewPoint = v3dObjectPoint*pr_RotationMatrix + pr_TranslationVector;
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// multiply X and Y coordinates with zoom factor and add the center of screen
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v3dViewPoint(1) =
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pr_ScreenCenter(1)
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+v3dViewPoint(1)*pr_vZoomFactors(1)
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+v3dViewPoint(3)*pr_vStepFactors(1);
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v3dViewPoint(2) =
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pr_ScreenCenter(2)
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+v3dViewPoint(2)*pr_vZoomFactors(2)
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+v3dViewPoint(3)*pr_vStepFactors(2);
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}
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/*
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* Get a distance of object point from the viewer.
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*/
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FLOAT CParallelProjection3D::GetDistance(const FLOAT3D &v3dObjectPoint) const
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{
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// get just the z coordinate of the point in viewer space
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return
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v3dObjectPoint(1)*pr_RotationMatrix(3,1)+
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v3dObjectPoint(2)*pr_RotationMatrix(3,2)+
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v3dObjectPoint(3)*pr_RotationMatrix(3,3)+
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pr_TranslationVector(3);
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}
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/*
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* Project 3D object direction vector into 3D view space.
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*/
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void CParallelProjection3D::ProjectDirection(const FLOAT3D &v3dObjectPoint,
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FLOAT3D &v3dViewPoint) const
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{
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// rotate the direction
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v3dViewPoint = v3dObjectPoint*pr_RotationMatrix;
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}
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/*
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* Project 3D object axis aligned bounding box into 3D view space.
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*/
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void CParallelProjection3D::ProjectAABBox(const FLOATaabbox3D &boxObject,
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FLOATaabbox3D &boxView) const
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{
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ASSERTALWAYS( "This is not yet implemented");
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}
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/*
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* Project 3D object plane into 3D view space.
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*/
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void CParallelProjection3D::Project(const FLOATplane3D &p3dObjectPlane,
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FLOATplane3D &p3dTransformedPlane) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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// rotate and translate the plane
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p3dTransformedPlane = p3dObjectPlane*pr_RotationMatrix + pr_TranslationVector;
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}
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/* Calculate plane gradient for a plane in 3D view space. */
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void CParallelProjection3D::MakeOoKGradient(const FLOATplane3D &plViewerPlane, CPlanarGradients &pgOoK) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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// ####!!!! use viewer plane or object plane?
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// create k gradients from the plane equation
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FLOAT xn = plViewerPlane(1);
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FLOAT yn = plViewerPlane(2);
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FLOAT zn = plViewerPlane(3);
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FLOAT d = plViewerPlane.Distance();
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FLOAT ci = pr_ScreenCenter(1);
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FLOAT cj = pr_ScreenCenter(2);
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FLOAT fx = pr_vZoomFactors(1);
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FLOAT fy = pr_vZoomFactors(2);
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FLOAT sx = pr_vStepFactors(1);
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FLOAT sy = pr_vStepFactors(2);
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FLOAT Div = zn-sx*xn-sy*yn;
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FLOAT dkodi = xn/(fx*Div);
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FLOAT dkodj = yn/(fy*Div);
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FLOAT k00 = d/Div-ci*dkodi-cj*dkodj;
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// NOTE: here, k is really used instead ook
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pgOoK.pg_f00 = k00;
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pgOoK.pg_fDOverDI = dkodi;
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pgOoK.pg_fDOverDJ = dkodj;
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}
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/*
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* Clip a line.
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*/
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ULONG CParallelProjection3D::ClipLine(FLOAT3D &v3dPoint0, FLOAT3D &v3dPoint1) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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// front clip plane is exactly the viewplane
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//const FLOATplane3D plFrontClip(FLOAT3D(0.0f,0.0f,-1.0f), 0.0f);
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ULONG ulCode0 = LCFVERTEX0(LCF_UNCLIPPED);
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ULONG ulCode1 = LCFVERTEX1(LCF_UNCLIPPED);
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// clip the line by each plane at the time, skip if some removes entire line
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if (ClipLineByNearPlane(v3dPoint0, v3dPoint1, 0.0f, ulCode0, ulCode1, LCF_NEAR)
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// if something remains
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) {
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// return the clip code for both vertices
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return ulCode0 | ulCode1;
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// if some of the planes removed entire line
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} else {
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// return the code that tells that entire line is removed
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return LCF_EDGEREMOVED;
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}
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}
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/*
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* Get placement for a ray through a projected point.
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*/
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void CParallelProjection3D::RayThroughPoint(const FLOAT3D &v3dViewPoint,
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CPlacement3D &plRay) const
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{
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ASSERTALWAYS("Function not supported");
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}
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/*
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* Check if an object-space plane is visible.
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*/
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BOOL CParallelProjection3D::IsObjectPlaneVisible(const FLOATplane3D &p3dObjectPlane) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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// the object plane is visible if it is not heading away from the view direction
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return (p3dObjectPlane*pr_mDirectionRotation)%pr_vViewDirection<0.01f;
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}
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/*
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* Check if a viewer-space plane is visible.
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*/
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BOOL CParallelProjection3D::IsViewerPlaneVisible(const FLOATplane3D &p3dViewerPlane) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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// the object plane is visible if it is not heading away from the view direction
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return p3dViewerPlane%pr_vViewDirection<0.01f;
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}
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/*
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* Calculate a mip-factor for a given object.
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*/
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// by its distance from viewer
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FLOAT CParallelProjection3D::MipFactor(FLOAT fDistance) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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/* calculated using following formula:
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k = log2(1024*z/xratio);
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*/
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return Log2(1024.0f/pr_vZoomFactors(1));
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}
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// general mip-factor for target object
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FLOAT CParallelProjection3D::MipFactor(void) const
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{
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// check that the projection object is prepared for projecting
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ASSERT(pr_Prepared);
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/* calculated using following formula:
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k = log2(1024*z/xratio);
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*/
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return Log2(1024.0f/pr_vZoomFactors(1));
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}
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