Source/SR_Line.c

/******************************************************************************
 **                                                                          **
 **     Module:     SR_Line.c                                                **
 **                                                                          **
 **                                                                          **
 **     Purpose:    Polyline routines                                        **
 **                                                                          **
 **                                                                          **
 **                                                                          **
 **     Copyright (C) 1996-1997 Apple Computer, Inc.  All rights reserved.   **
 **                                                                          **
 **                                                                          **
 *****************************************************************************/
#include <assert.h>
 
#include "QD3D.h"
#include "SR.h"
 
 
/*===========================================================================*\
 *
 *  Routine:    SR_Geometry_Line()
 *
 *  Comments:   
 *
\*===========================================================================*/
 
TQ3Status SR_Geometry_Line(
    TQ3ViewObject           view, 
    TSRPrivate              *srPrivate,
    TQ3GeometryObject       line,
    TQ3LineData             *lineData)
{
    unsigned long           numVertices;
    TQ3Boolean              highlightState;
    TQ3XClipMaskState       clipMaskState;
    TQ3ColorRGB             color;
    
    UNUSED(line);
 
    assert(view         != NULL);
    assert(srPrivate    != NULL);
    assert(lineData     != NULL);
    
    /*
     *  Call the application's idle progress method, via the view.  If
     *  the app's method returns kQ3Failure, then we don't go on.
     */
    if (SR_IdleProgress(view, srPrivate) == kQ3Failure) {
        return (kQ3Success);
    }
    
    /*
     *  Sanity check. If no draw region, bail.
     */
    if (srPrivate->drawRegion == NULL) {
        return (kQ3Success);
    }
    
    /*
     *  Find out if we're clipped out or not. No reason to go any
     *  further if the region is obscured or entirely off-screen. 
     */
    Q3XDrawRegion_GetClipFlags(srPrivate->drawRegion, &clipMaskState);
    if (clipMaskState == kQ3XClipMaskNotExposed) {
        return (kQ3Success);
    }
 
    /*
     *  Lazy-evaluate the various transforms for the pipeline
     */
    if (SR_UpdatePipeline(srPrivate) == kQ3Failure) {
        return (kQ3Failure);
    }
 
    /*
     *  Lines have two vertices :-)
     */
    numVertices = 2;
            
    /*
     *  Highlight state and  color are from the view, unless
     *  overridden by the lineAttributeSet
     */
    highlightState  = srPrivate->viewHighlightState;
    color           = srPrivate->viewDiffuseColor;
    
    /*
     *  Check if we have a line attribute set.
     *  If so, then see if we can get a color and highlight state
     *  out of it. 
     */
    if (lineData->lineAttributeSet != NULL) {
        TQ3XAttributeMask   attributeMask;
        
        attributeMask = Q3XAttributeSet_GetMask(lineData->lineAttributeSet);
        
        if (attributeMask & kQ3XAttributeMaskDiffuseColor) {
            Q3AttributeSet_Get(
                lineData->lineAttributeSet,
                kQ3AttributeTypeDiffuseColor,
                &color);
        }
 
        if (attributeMask & kQ3XAttributeMaskHighlightState) {
            Q3AttributeSet_Get(
                lineData->lineAttributeSet, 
                kQ3AttributeTypeHighlightState, 
                &highlightState);
        }
    }
 
    /*
     *  If we're highlighting, then see if we can get a highlight color
     *  out of the view's attribute set. Use that as the color, if it's there.
     */
    if ((highlightState == kQ3True) &&
        (srPrivate->viewHighlightAttributeSet != NULL)) {
        TQ3XAttributeMask   attributeMask;
        
        attributeMask = Q3XAttributeSet_GetMask(srPrivate->viewHighlightAttributeSet);
        
        if (attributeMask & kQ3XAttributeMaskDiffuseColor) {
            Q3AttributeSet_Get( 
                srPrivate->viewHighlightAttributeSet, 
                kQ3AttributeTypeDiffuseColor, 
                &color);
        }
    }
    
    /*
     *  Dispatch to the proper pipeline, depending on the fill style.
     */
    switch (srPrivate->viewFillStyle) {
        case kQ3FillStyleFilled:    
        case kQ3FillStyleEdges: {
            if (SR_LinePipe(
                    srPrivate, 
                    (TQ3Point3D *)lineData->vertices, 
                    numVertices, 
                    sizeof(TQ3Vertex3D),
                    &color,
                    NULL,
                    DO_POLYLINE) == kQ3Failure) {
                return (kQ3Failure);
            }
            break;
        }
        case kQ3FillStylePoints: {
            if (SR_PointPipe(
                    srPrivate, 
                    (TQ3Point3D *)lineData->vertices, 
                    numVertices, 
                    sizeof(TQ3Vertex3D),
                    &color,
                    NULL,
                    DO_POLYLINE) == kQ3Failure) {
                return (kQ3Failure);
            }
            break;
        }
        default: {
            return (kQ3Failure);
            break;
        }
    }
 
    return (kQ3Success);
}


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