255 lines
6.8 KiB
C
255 lines
6.8 KiB
C
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/******************************Module*Header*******************************\
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* Module Name: genstrip.c
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*
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* The Ribbon and 2 Ribbon styles of the 3D Flying Objects screen saver.
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*
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* Animation of 1 or 2 quad strips floating about.
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*
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* Copyright (c) 1994 Microsoft Corporation
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*
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\**************************************************************************/
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#include <windows.h>
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#include <GL\gl.h>
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#include <string.h>
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#include <math.h>
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#include "ss3dfo.h"
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#include "mesh.h"
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static MESH stripMesh;
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static int iPrec = 40;
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void genStrip()
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{
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static int counter = 0;
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int i;
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int facecount;
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// Use Hermite basis, pg 488, FVD
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static float M[4][4] = {{2.0f, -2.0f, 1.0f, 1.0f},
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{-3.0f, 3.0f, -2.0f, -1.0f},
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{0.0f, 0.0f, 1.0f, 0.0f},
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{1.0f, 0.0f, 0.0f, 0.0f}};
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float xx[4], yy[4], zz[4];
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float cx[4], cy[4], cz[4];
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float d = 1.0f / (float) iPrec;
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float t = 0.0f;
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float t2, t3;
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POINT3D p1 = {-0.5f, 0.0f, 0.0f};
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POINT3D p2 = {0.5f, 0.0f, 0.0f};
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POINT3D v1 = {1.5f, 1.5f, 0.0f};
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POINT3D v2 = {0.0f, 3.0f, 0.0f};
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POINT3D norm;
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float sinVal;
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float angle;
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float angleStep = (float) (PI / iPrec);
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static float rotA = 0.0f;
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static float rotB = (float) (PI / 2.0);
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static float sideSin = 0.0f;
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float rotStepA = (float) (PI / (2.0 * iPrec));
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float rotStepB = (float) (PI / (4.0 * iPrec));
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MESH *mesh = &stripMesh;
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#define NORMS(x, y) stripMesh.norms[((x) * iPrec) + y]
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#define GRID(x, y) stripMesh.pts[((x) * iPrec) + y]
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v1.x = (float) (4.0 * cos(rotA));
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v1.y = (float) (4.0 * sin(rotA));
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p2.x = (float) (0.5 * sin(rotB));
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// p2.y = (float) (0.5 * sin(rotB));
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rotA += rotStepA;
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rotB += rotStepB;
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counter++;
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if (counter >= (2 * iPrec)) {
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rotStepA = -rotStepA;
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counter = 0;
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}
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angle = sideSin;
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sideSin += (float) (PI / 80.0);
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xx[0] = p1.x;
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xx[1] = p2.x;
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xx[2] = v1.x;
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xx[3] = v2.x;
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yy[0] = p1.y;
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yy[1] = p2.y;
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yy[2] = v1.y;
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yy[3] = v2.y;
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zz[0] = p1.z;
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zz[1] = p2.z;
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zz[2] = v1.z;
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zz[3] = v2.z;
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for (i = 0; i < 4; i++) {
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cx[i] = xx[0] * M[i][0] + xx[1] * M[i][1] +
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xx[2] * M[i][2] + xx[3] * M[i][3];
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cy[i] = yy[0] * M[i][0] + yy[1] * M[i][1] +
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yy[2] * M[i][2] + yy[3] * M[i][3];
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cz[i] = zz[0] * M[i][0] + zz[1] * M[i][1] +
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zz[2] * M[i][2] + zz[3] * M[i][3];
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}
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for (i = 0; i < iPrec; i++) {
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float x, y;
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t += d;
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t2 = t * t;
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t3 = t2 * t;
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x = cx[0] * t3 + cx[1] * t2 + cx[2] * t + cx[3];
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y = cy[0] * t3 + cy[1] * t2 + cy[2] * t + cy[3];
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sinVal = (float) (sin(angle) / 5.0);
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if (sinVal < 0.0)
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sinVal = -sinVal;
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angle += angleStep;
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GRID(0, i).x = x;
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GRID(0, i).z = y;
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GRID(0, i).y = 0.25f; // extrusion // + sinVal;
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GRID(1, i).x = x;
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GRID(1, i).z = y;
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GRID(1, i).y = -0.25f; // - sinVal;
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}
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stripMesh.numFaces = 0;
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for (i = 0; i < 2 * iPrec; i++)
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mesh->norms[i] = ss_ptZero;
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for (facecount = 0, i = 0; i < (iPrec - 1); i++) {
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ss_calcNorm(&norm, &GRID(0, i + 1), &GRID(0, i), &GRID(1, i));
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stripMesh.faces[facecount].material = 0;
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stripMesh.faces[facecount].norm = norm;
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NORMS(0, i).x += norm.x;
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NORMS(0, i).y += norm.y;
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NORMS(0, i).z += norm.z;
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NORMS(1, i).x += norm.x;
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NORMS(1, i).y += norm.y;
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NORMS(1, i).z += norm.z;
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if (i != (iPrec - 1)) {
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NORMS(0, i+1).x += norm.x;
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NORMS(0, i+1).y += norm.y;
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NORMS(0, i+1).z += norm.z;
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NORMS(1, i+1).x += norm.x;
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NORMS(1, i+1).y += norm.y;
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NORMS(1, i+1).z += norm.z;
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}
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stripMesh.faces[facecount].p[0] = i;
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stripMesh.faces[facecount].p[1] = iPrec + i;
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stripMesh.faces[facecount].p[2] = i + 1;
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stripMesh.faces[facecount].p[3] = iPrec + i + 1;
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stripMesh.numFaces++;
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facecount++;
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}
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stripMesh.numPoints = 2 * iPrec;
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ss_normalizeNorms(stripMesh.norms, stripMesh.numPoints);
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}
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void initStripScene()
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{
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iPrec = (int)(fTesselFact * 40.5);
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if (iPrec < 4)
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iPrec = 4;
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newMesh(&stripMesh, iPrec, 2 * iPrec);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-1.1, 1.1, -1.1, 1.1, 0.0, 3.0);
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glTranslatef(0.0f, 0.0f, -1.5f);
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glRotatef(50.0f, 1.0f, 0.0f, 0.0f);
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glRotatef(50.0f, 0.0f, 1.0f, 0.0f);
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glRotatef(12.0f, 0.0f, 0.0f, 1.0f);
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glMatrixMode(GL_MODELVIEW);
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}
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void delStripScene()
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{
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delMesh(&stripMesh);
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}
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void updateStripScene(int flags)
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{
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static double mxrot = 0.0;
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static double myrot = 0.0;
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static double mzrot = 0.0;
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static double mxrotInc = 0.0;
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static double myrotInc = 0.1;
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static double mzrotInc = 0.0;
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static int h = 0;
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RGBA color;
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if( gbBounce ) {
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// floating window bounced off an edge
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if (mxrotInc) {
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mxrotInc = 0.0;
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myrotInc = 0.1;
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} else if (myrotInc) {
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myrotInc = 0.0;
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mzrotInc = 0.1;
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} else if (mzrotInc) {
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mzrotInc = 0.0;
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mxrotInc = 0.1;
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}
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gbBounce = FALSE;
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}
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glLoadIdentity();
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glRotatef((GLfloat) (mxrot * (180.0 / PI)), 1.0f, 0.0f, 0.0f);
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glRotatef((GLfloat) (myrot * (180.0 / PI)), 0.0f, 1.0f, 0.0f);
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glRotatef((GLfloat) (mzrot * (180.0 / PI)), 0.0f, 0.0f, 1.0f);
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genStrip();
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if (bColorCycle) {
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ss_HsvToRgb((float)h, 1.0f, 1.0f, &color );
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glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE,
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(GLfloat *) &color);
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h++;
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h %= 360;
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} else {
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glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE,
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(GLfloat *) &Material[1].kd);
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}
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updateObject(&stripMesh, bSmoothShading);
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if (flags & 0x4) {
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glLoadIdentity();
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glTranslatef(0.05f, 0.0f, 0.0f);
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glRotatef((GLfloat) (myrot * (180.0 / PI)), 1.0f, 0.0f, 0.0f);
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glRotatef((GLfloat) (mxrot * (180.0 / PI)), 0.0f, 1.0f, 0.0f);
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glRotatef((GLfloat) (mzrot * (180.0 / PI)), 0.0f, 0.0f, 1.0f);
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if (bColorCycle) {
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color.r = 1.0f - color.r;
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color.g = 1.0f - color.g;
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color.b = 1.0f - color.b;
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glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE,
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(GLfloat *) &color);
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} else {
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glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE,
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(GLfloat *) &Material[2].kd);
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}
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updateObject(&stripMesh, bSmoothShading);
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}
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mxrot += mxrotInc;
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myrot += myrotInc;
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mzrot += mzrotInc;
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}
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