156 lines
3.9 KiB
C++
156 lines
3.9 KiB
C++
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/******************************Module*Header*******************************\
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* Module Name: util.cxx
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*
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* Copyright (c) 1997 Microsoft Corporation
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*
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\**************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include "mtk.hxx"
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#include "util.hxx"
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GLuint defaultQuad; // display list for quad
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// Local copies of tranf. matrices, for determing rect bounds
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static GLdouble modelMatrix[16];
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static GLdouble projMatrix[16];
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static GLint viewport[4];
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/**************************************************************************\
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*
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\**************************************************************************/
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void
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UpdateLocalTransforms( int bits )
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{
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// Get current transformation info
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if( bits & UPDATE_MODELVIEW_MATRIX_BIT )
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glGetDoublev( GL_MODELVIEW_MATRIX, modelMatrix );
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if( bits & UPDATE_PROJECTION_MATRIX_BIT )
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glGetDoublev( GL_PROJECTION_MATRIX, projMatrix );
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if( bits & UPDATE_VIEWPORT_BIT )
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glGetIntegerv( GL_VIEWPORT, viewport );
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}
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void
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TransformObjectToWindow( POINT3D *pIn, POINT3D *pOut, int nPts )
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{
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DPOINT3D outD;
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for( ; nPts; nPts--, pIn++, pOut++ ) {
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gluProject( pIn->x, pIn->y, pIn->z,
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modelMatrix, projMatrix, viewport,
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&outD.x, &outD.y, &outD.z );
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pOut->x = (float) outD.x;
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pOut->y = (float) outD.y;
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pOut->z = (float) outD.z;
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}
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}
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void
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TransformWindowToObject( POINT3D *pIn, POINT3D *pOut )
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{
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DPOINT3D outD;
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gluUnProject( pIn->x, pIn->y, pIn->z,
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modelMatrix, projMatrix, viewport,
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&outD.x, &outD.y, &outD.z );
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pOut->x = (float) outD.x;
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pOut->y = (float) outD.y;
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pOut->z = (float) outD.z;
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}
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void
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DrawRect( FSIZE *fSize )
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{
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float w = fSize->width / 2.0f;
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float h = fSize->height / 2.0f;
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glNormal3f( 0.0f, 0.0f, 1.0f );
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glBegin( GL_QUADS );
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glTexCoord2f( 1.0f, 1.0f );
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glVertex3f( w, h, 0.0f );
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glTexCoord2f( 0.0f, 1.0f );
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glVertex3f( -w, h, 0.0f );
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glTexCoord2f( 0.0f, 0.0f );
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glVertex3f( -w, -h, 0.0f );
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glTexCoord2f( 1.0f, 0.0f );
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glVertex3f( w, -h, 0.0f );
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glEnd();
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}
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void
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AddSwapHintRect( GLIRECT *pRect )
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{
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glAddSwapHintRect( pRect->x, pRect->y, pRect->width, pRect->height );
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}
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#define BloatRect( pRect, n ) \
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pRect->x -= n; \
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pRect->y -= n; \
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pRect->width += (n << 2); \
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pRect->height+= (n << 2);
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// Calculate the 2d view rect, using view parameters and window size. The
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// rect is in the z=0 plane.
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// Calculate the 2d window rect for each log object
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// !!! Assumes no rotation of the object !!!
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void
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CalcRect( POINT3D *pbl, POINT3D *ptr, GLIRECT *pRect )
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{
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//mf: check for inclusive/exclusive and rounding problems
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// 1) truncate both
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pRect->x = (int) (pbl->x);
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pRect->y = (int) (pbl->y);
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pRect->width = ((int) (ptr->x )) - pRect->x + 1;
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pRect->height = ((int) (ptr->y )) - pRect->y + 1;
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//mf: while this works for polygons, it does not work for lines, since
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// the rasterization rules are different for lines. Lines can be off by
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// +1, so bloat the box by 1 on all sides.
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BloatRect( pRect, 1 );
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}
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// Calcs window rects for the objects at REST (pObj->dest)
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void
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CalcMinMaxRect( POINT3D *pts, GLIRECT *pRect, int nPts )
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{
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POINT2D min, max;
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// Use first point to init min,max
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min.x = max.x = pts->x;
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min.y = max.y = pts->y;
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nPts--;
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pts++;
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for( ; nPts; nPts--, pts++ ) {
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if( pts->x < min.x )
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min.x = pts->x;
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if( pts->x > max.x )
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max.x = pts->x;
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if( pts->y < min.y )
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min.y = pts->y;
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if( pts->y > max.y )
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max.y = pts->y;
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}
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pRect->x = (int) (min.x);
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pRect->y = (int) (min.y);
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pRect->width = ((int) max.x) - pRect->x + 1;
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pRect->height = ((int) max.y) - pRect->y + 1;
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BloatRect( pRect, 1 );
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}
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