// My3dSupport.c - QuickDraw 3d routines

//

// This file contains utility routines for QuickDraw 3d sample code.

// Shows how to read a metafile and render it.

//

// Created 27th Dec 1994, Nick Thompson, DEVSUPPORT

#include <Files.h>

#include <QuickDraw.h>

#include <QDOffScreen.h>

#include <StandardFile.h>

#include "GTSupport.h"

#include "QD3D.h"

#include "QD3DDrawContext.h"

#include "QD3DRenderer.h"

#include "QD3DShader.h"

#include "QD3DCamera.h"

#include "QD3DLight.h"

#include "QD3DGeometry.h"

#include "QD3DTransform.h"

#include "QD3DGroup.h"

#include "QD3DMath.h"

#include "QD3DStorage.h"

#include "QD3DIO.h"

//-----------------------------------------------------------------------------------------------

// local utility functions

void GetGroupBBox(

    DocumentHdl         theDocument,

    TQ3BoundingBox      *viewBBox) ;

static TQ3Status GetDocumentGroupBoundingBox( 

    DocumentHdl theDocument , 

    TQ3BoundingBox *viewBBox) ;

//-----------------------------------------------------------------------------------------------

// Submit the scene for rendering/fileIO and picking

TQ3Status SubmitScene( DocumentHdl theDocument ) 

{

    TQ3Vector3D             globalScale;

    TQ3Vector3D             globalTranslate;

    TQ3Status               status; 

    globalScale.x = globalScale.y = globalScale.z = (**theDocument).fGroupScale;

    globalTranslate = *(TQ3Vector3D *)&(**theDocument).fGroupCenter;

    Q3Vector3D_Scale(&globalTranslate, -1, &globalTranslate);

    Q3Style_Submit((**theDocument).fInterpolation, (**theDocument).fView);

    Q3Style_Submit((**theDocument).fBackFacing , (**theDocument).fView);

    Q3Style_Submit((**theDocument).fFillStyle, (**theDocument).fView);

    status = Q3MatrixTransform_Submit( &(**theDocument).fRotation, (**theDocument).fView);

    Q3ScaleTransform_Submit(&globalScale, (**theDocument).fView);

    Q3TranslateTransform_Submit(&globalTranslate, (**theDocument).fView);

    Q3Shader_Submit( (**theDocument).fShader, (**theDocument).fView ) ;

    status = Q3DisplayGroup_Submit( (**theDocument).fModel, (**theDocument).fView);

    return kQ3Success ;

}

//-----------------------------------------------------------------------------------------------

static TQ3Status GetDocumentGroupBoundingBox( 

    DocumentHdl theDocument , 

    TQ3BoundingBox *viewBBox)

{

    TQ3Status       status;

    TQ3ViewStatus   viewStatus ;

    status = Q3View_StartBoundingBox( (**theDocument).fView, kQ3ComputeBoundsApproximate );

    do {

        status = SubmitScene( theDocument ) ;

    } while((viewStatus = Q3View_EndBoundingBox( (**theDocument).fView, viewBBox )) == kQ3ViewStatusRetraverse );

    return status ;

}

//-----------------------------------------------------------------------------------------------

TQ3ViewObject MyNewView(WindowPtr theWindow)

{

    TQ3Status               myStatus;

    TQ3ViewObject           myView;

    TQ3DrawContextObject        myDrawContext;

    TQ3RendererObject       myRenderer;

    TQ3CameraObject         myCamera;

    TQ3GroupObject          myLights;

    myView = Q3View_New();

    //  Create and set draw context.

    if ((myDrawContext = MyNewDrawContext(theWindow)) == nil )

        goto bail;

    if ((myStatus = Q3View_SetDrawContext(myView, myDrawContext)) == kQ3Failure )

        goto bail;

    Q3Object_Dispose( myDrawContext ) ;

    // Create and set renderer.

    //

    // hacky way to do this, but since I wanted these snippets to have 

    // a minimal interface, this will suffice

    //

    // change the next line to Ò#if 1Ó to use the WF renderer

#if 0

    // this would use the wireframe renderer

    myRenderer = Q3Renderer_NewFromType(kQ3RendererTypeWireFrame);

    if ((myStatus = Q3View_SetRenderer(myView, myRenderer)) == kQ3Failure ) {

        goto bail;

    }

#else

    // this would use the interactive software renderer

    if ((myRenderer = Q3Renderer_NewFromType(kQ3RendererTypeInteractive)) != nil ) {

        if ((myStatus = Q3View_SetRenderer(myView, myRenderer)) == kQ3Failure ) {

            goto bail;

        }

    }

    else {

        goto bail;

    }

#endif

    Q3Object_Dispose( myRenderer ) ;

    //  Create and set camera.

    if ( (myCamera = MyNewCamera(theWindow)) == nil )

        goto bail;

    if ((myStatus = Q3View_SetCamera(myView, myCamera)) == kQ3Failure )

        goto bail;

    Q3Object_Dispose( myCamera ) ;

    //  Create and set lights.

    if ((myLights = MyNewLights()) == nil )

        goto bail;

    if ((myStatus = Q3View_SetLightGroup(myView, myLights)) == kQ3Failure )

        goto bail;

    Q3Object_Dispose(myLights);

    //  Done!!!

    return ( myView );

bail:

    //  If any of the above failed, then don't return a view.

    return ( nil );

}

//----------------------------------------------------------------------------------

TQ3DrawContextObject MyNewDrawContext(WindowPtr theWindow)

{

    TQ3DrawContextData      myDrawContextData;

    TQ3MacDrawContextData   myMacDrawContextData;

    TQ3ColorARGB            ClearColor;

    TQ3DrawContextObject    myDrawContext ;

    ClearColor.a = 1.0;

    ClearColor.r = 1.0;

    ClearColor.g = 1.0;

    ClearColor.b = 1.0;

    //  Fill in draw context data.

    myDrawContextData.clearImageMethod = kQ3ClearMethodWithColor;

    myDrawContextData.clearImageColor = ClearColor;

    myDrawContextData.paneState = kQ3False;

    myDrawContextData.maskState = kQ3False;

    myDrawContextData.doubleBufferState = kQ3True;

    myMacDrawContextData.drawContextData = myDrawContextData;

    myMacDrawContextData.window = (CGrafPtr) theWindow;     // this is the window associated with the view

    myMacDrawContextData.library = kQ3Mac2DLibraryNone;

    myMacDrawContextData.viewPort = nil;

    myMacDrawContextData.grafPort = nil;

    //  Create draw context and return it, if itÕs nil the caller must handle

    myDrawContext = Q3MacDrawContext_New(&myMacDrawContextData) ;

    return myDrawContext ;

}

//----------------------------------------------------------------------------------

TQ3CameraObject MyNewCamera(WindowPtr theWindow)

{

    TQ3CameraObject                 myCamera;

    TQ3CameraData                   myCameraData;

    TQ3ViewAngleAspectCameraData        myViewAngleCameraData;

    TQ3Point3D                      cameraFrom  = { 0.0, 0.0, 30.0 };

    TQ3Point3D                      cameraTo    = { 0.0, 0.0, 0.0 };

    TQ3Vector3D                     cameraUp    = { 0.0, 1.0, 0.0 };

    float                           fieldOfView = .52359333333;

    float                           hither      = 0.001;

    float                           yon         = 1000;

    //  Fill in camera data.

    myCameraData.placement.cameraLocation = cameraFrom;

    myCameraData.placement.pointOfInterest = cameraTo;

    myCameraData.placement.upVector = cameraUp;

    myCameraData.range.hither = hither;

    myCameraData.range.yon = yon;

    myCameraData.viewPort.origin.x = -1.0;

    myCameraData.viewPort.origin.y = 1.0;

    myCameraData.viewPort.width = 2.0;

    myCameraData.viewPort.height = 2.0;

    myViewAngleCameraData.cameraData = myCameraData;

    myViewAngleCameraData.fov = fieldOfView ;

    // set up the aspect ratio based on the window

    myViewAngleCameraData.aspectRatioXToY =  

            (float) (theWindow->portRect.right - theWindow->portRect.left) / 

            (float) (theWindow->portRect.bottom - theWindow->portRect.top);

    myCamera = Q3ViewAngleAspectCamera_New(&myViewAngleCameraData); 

    //  Return the camera.

    return ( myCamera );

}

//----------------------------------------------------------------------------------

TQ3GroupObject MyNewLights()

{

    TQ3GroupPosition            myGroupPosition;

    TQ3GroupObject          myLightList;

    TQ3LightData                myLightData;

    TQ3PointLightData       myPointLightData;

    TQ3DirectionalLightData myDirectionalLightData;

    TQ3LightObject          myAmbientLight, myPointLight, myFillLight;

    TQ3Point3D              pointLocation = { -10.0, 0.0, 10.0 };

    TQ3Vector3D             fillDirection = { 10.0, 0.0, 10.0 };

    TQ3ColorRGB             WhiteLight = { 1.0, 1.0, 1.0 };

    //  Set up light data for ambient light.  This light data will be used for point and fill

    //  light also.

    myLightData.isOn = kQ3True;

    myLightData.color = WhiteLight;

    //  Create ambient light.

    myLightData.brightness = .2;

    myAmbientLight = Q3AmbientLight_New(&myLightData);

    if ( myAmbientLight == nil )

        goto bail;

    //  Create point light.

    myLightData.brightness = 1.0;

    myPointLightData.lightData = myLightData;

    myPointLightData.castsShadows = kQ3False;

    myPointLightData.attenuation = kQ3AttenuationTypeNone;

    myPointLightData.location = pointLocation;

    myPointLight = Q3PointLight_New(&myPointLightData);

    if ( myPointLight == nil )

        goto bail;

    //  Create fill light.

    myLightData.brightness = .2;

    myDirectionalLightData.lightData = myLightData;

    myDirectionalLightData.castsShadows = kQ3False;

    myDirectionalLightData.direction = fillDirection;

    myFillLight = Q3DirectionalLight_New(&myDirectionalLightData);

    if ( myFillLight == nil )

        goto bail;

    //  Create light group and add each of the lights into the group.

    myLightList = Q3LightGroup_New();

    if ( myLightList == nil )

        goto bail;

    myGroupPosition = Q3Group_AddObject(myLightList, myAmbientLight);

    if ( myGroupPosition == 0 )

        goto bail;

    myGroupPosition = Q3Group_AddObject(myLightList, myPointLight);

    if ( myGroupPosition == 0 )

        goto bail;

    myGroupPosition = Q3Group_AddObject(myLightList, myFillLight);

    if ( myGroupPosition == 0 )

        goto bail;

    Q3Object_Dispose( myAmbientLight ) ;

    Q3Object_Dispose( myPointLight ) ;

    Q3Object_Dispose( myFillLight ) ;

    //  Done!

    return ( myLightList );

bail:

    //  If any of the above failed, then return nothing!

    return ( nil );

}

//----------------------------------------------------------------------------------

void GetGroupBBox(

    DocumentHdl         theDocument,

    TQ3BoundingBox      *viewBBox)

{

    TQ3Point3D                  from    = { 0.0, 0.0, 1.0 };

    TQ3Point3D                  to      = { 0.0, 0.0, 0.0 };

    TQ3Vector3D                 up      = { 0.0, 1.0, 0.0 };

    float                       fieldOfView = .52359333333;

    float                       hither      =  0.5;

    float                       yon         =  1.5;

    TQ3GroupObject              mainGroup = (**theDocument).fModel ;

    TQ3Status                   status;

#ifdef BETA_1_BUILD

    Q3View_StartBounds( (**theDocument).fView );

    status = Q3DisplayGroup_BoundingBox(mainGroup, 

                                        viewBBox, 

                                        kQ3ComputeBoundsApproximate,

                                        viewObject);

    Q3View_EndBounds( (**theDocument).fView );

#else

    status = GetDocumentGroupBoundingBox( theDocument , viewBBox) ;

#endif

    //

    //  If we have a point model, then the "viewBBox" would end up

    //  being a "singularity" at the location of the point.  As

    //  this bounding "box" is used in setting up the camera spec,

    //  we get bogus input into Escher.

    {

        float       xSize, ySize, zSize;

        xSize = viewBBox->max.x - viewBBox->min.x;

        ySize = viewBBox->max.y - viewBBox->min.y;

        zSize = viewBBox->max.z - viewBBox->min.z;

        if (xSize <= kQ3RealZero &&

            ySize <= kQ3RealZero &&

            zSize <= kQ3RealZero) {

            viewBBox->max.x += 0.0001;

            viewBBox->max.y += 0.0001;

            viewBBox->max.z += 0.0001;

            viewBBox->min.x -= 0.0001;

            viewBBox->min.y -= 0.0001;

            viewBBox->min.z -= 0.0001;

        }

    }

}

//------------------------------------------------------------------------

TQ3Point3D AdjustCamera(

    DocumentHdl         theDocument,

    short               winWidth,

    short               winHeight)

{

    float                       fieldOfView;

    float                       hither;

    float                       yon;

    TQ3CameraPlacement          placement;

    TQ3CameraRange              range;

    TQ3BoundingBox              viewBBox;

    long                        fromAxis;   

    float                       maxDimension;

    float                       xSize, ySize, zSize;

    float                       weights[2] = { 0.5, 0.5 };

    TQ3Point3D                  points[2];

    TQ3Vector3D                 viewVector;

    TQ3Vector3D                 normViewVector;

    TQ3Vector3D                 eyeToFrontClip;

    TQ3Vector3D                 eyeToBackClip;

    float                       viewDistance;

    TQ3Vector3D                 diagonalVector;

    float                       ratio;

    TQ3CameraObject             camera;

    TQ3ViewObject               theView = (**theDocument).fView ;

    TQ3GroupObject              mainGroup = (**theDocument).fModel ;

    TQ3Point3D                  *documentGroupCenter = &(**theDocument).fGroupCenter ;

    float                       *documentGroupScale  = &(**theDocument).fGroupScale ;

    Q3View_GetCamera( theView, &camera);

    GetGroupBBox( theDocument, &viewBBox);

    /*

     *  If we have a point model, then the "viewBBox" would end up

     *  being a "singularity" at the location of the point.  As

     *  this bounding "box" is used in setting up the camera spec,

     *  we get bogus input into Escher.

     */

    xSize = viewBBox.max.x - viewBBox.min.x;

    ySize = viewBBox.max.y - viewBBox.min.y;

    zSize = viewBBox.max.z - viewBBox.min.z;

    if (xSize <= kQ3RealZero &&

        ySize <= kQ3RealZero &&

        zSize <= kQ3RealZero)  {

        viewBBox.max.x += 0.0001;

        viewBBox.max.y += 0.0001;

        viewBBox.max.z += 0.0001;

        viewBBox.min.x -= 0.0001;

        viewBBox.min.y -= 0.0001;

        viewBBox.min.z -= 0.0001;

    }

    points[0] = viewBBox.min;

    points[1] = viewBBox.max;

    Q3Point3D_AffineComb(points, weights, 2, documentGroupCenter);

    /*

     *  The "from" point is on a vector perpendicular to the plane

     *  in which the bounding box has greatest dimension.  As "up" is

     *  always in the positive y direction, look at x and z directions.

     */

    xSize = viewBBox.max.x - viewBBox.min.x;

    zSize = viewBBox.max.z - viewBBox.min.z;

    if (xSize > zSize) {

        fromAxis = kQ3AxisZ;

    } else {

        fromAxis = kQ3AxisX;

    }

    /*

     *  Compute the length of the diagonal of the bounding box.

     *

     *  The hither and yon planes are adjusted so that the

     *  diagonal of the bounding box is 7/8 the size of the

     *  minimum dimension of the view frustum. The diagonal is used instead

     *  of the maximum size (in x, y, or z) so that when you rotate

     *  the object, the corners don't get clipped out.

     */

    Q3Point3D_Subtract(

        &viewBBox.max,

        &viewBBox.min,

        &diagonalVector);

    maxDimension    =   Q3Vector3D_Length(&diagonalVector);

    maxDimension    *=  8.0 / 7.0;

    ratio = 1.0 / maxDimension;

    *documentGroupScale = ratio;

    Q3Camera_GetPlacement(camera, &placement);

    Q3Point3D_Subtract(

        &placement.cameraLocation,

        &placement.pointOfInterest,

        &viewVector);

    viewDistance = Q3Vector3D_Length(&viewVector);

    Q3Vector3D_Normalize(&viewVector, &normViewVector);

    Q3Vector3D_Scale(&normViewVector, 

                     viewDistance - ratio * maxDimension/2.0,

                     &eyeToFrontClip);

    Q3Vector3D_Scale(&normViewVector, 

                    viewDistance + ratio * maxDimension/2.0,

                    &eyeToBackClip);

    hither  = Q3Vector3D_Length(&eyeToFrontClip);

    yon     = Q3Vector3D_Length(&eyeToBackClip);

    fieldOfView = 2 * atan((ratio * maxDimension/2.0)/hither);

    range.hither                = hither;

    range.yon                   = yon;

    Q3Camera_SetRange(camera, &range);

    Q3ViewAngleAspectCamera_SetFOV(

        camera, fieldOfView);

    Q3ViewAngleAspectCamera_SetAspectRatio(

        camera, (float) winWidth / (float) winHeight);

    Q3Object_Dispose(camera);

    return( *documentGroupCenter );

}