1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
5//
6// This Source Code Form is subject to the terms of the Mozilla
7// Public License v. 2.0. If a copy of the MPL was not distributed
8// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9
10#include "gpuhelper.h"
11#include "icosphere.h"
12#include <GL/glu.h>
13// PLEASE don't look at this old code... ;)
14
15#include <fstream>
16#include <algorithm>
17
18GpuHelper gpu;
19
20GpuHelper::GpuHelper()
21{
22    mVpWidth = mVpHeight = 0;
23    mCurrentMatrixTarget = 0;
24    mInitialized = false;
25}
26
27GpuHelper::~GpuHelper()
28{
29}
30
31void GpuHelper::pushProjectionMode2D(ProjectionMode2D pm)
32{
33    // switch to 2D projection
34    pushMatrix(Matrix4f::Identity(),GL_PROJECTION);
35
36    if(pm==PM_Normalized)
37    {
38        //glOrtho(-1., 1., -1., 1., 0., 1.);
39    }
40    else if(pm==PM_Viewport)
41    {
42        GLint vp[4];
43        glGetIntegerv(GL_VIEWPORT, vp);
44        glOrtho(0., vp[2], 0., vp[3], -1., 1.);
45    }
46
47    pushMatrix(Matrix4f::Identity(),GL_MODELVIEW);
48}
49
50void GpuHelper::popProjectionMode2D(void)
51{
52    popMatrix(GL_PROJECTION);
53    popMatrix(GL_MODELVIEW);
54}
55
56void GpuHelper::drawVector(const Vector3f& position, const Vector3f& vec, const Color& color, float aspect /* = 50.*/)
57{
58    static GLUquadricObj *cylindre = gluNewQuadric();
59    glColor4fv(color.data());
60    float length = vec.norm();
61    pushMatrix(GL_MODELVIEW);
62    glTranslatef(position.x(), position.y(), position.z());
63    Vector3f ax = Matrix3f::Identity().col(2).cross(vec);
64    ax.normalize();
65    Vector3f tmp = vec;
66    tmp.normalize();
67    float angle = 180.f/M_PI * acos(tmp.z());
68    if (angle>1e-3)
69        glRotatef(angle, ax.x(), ax.y(), ax.z());
70    gluCylinder(cylindre, length/aspect, length/aspect, 0.8*length, 10, 10);
71    glTranslatef(0.0,0.0,0.8*length);
72    gluCylinder(cylindre, 2.0*length/aspect, 0.0, 0.2*length, 10, 10);
73
74    popMatrix(GL_MODELVIEW);
75}
76
77void GpuHelper::drawVectorBox(const Vector3f& position, const Vector3f& vec, const Color& color, float aspect)
78{
79    static GLUquadricObj *cylindre = gluNewQuadric();
80    glColor4fv(color.data());
81    float length = vec.norm();
82    pushMatrix(GL_MODELVIEW);
83    glTranslatef(position.x(), position.y(), position.z());
84    Vector3f ax = Matrix3f::Identity().col(2).cross(vec);
85    ax.normalize();
86    Vector3f tmp = vec;
87    tmp.normalize();
88    float angle = 180.f/M_PI * acos(tmp.z());
89    if (angle>1e-3)
90        glRotatef(angle, ax.x(), ax.y(), ax.z());
91    gluCylinder(cylindre, length/aspect, length/aspect, 0.8*length, 10, 10);
92    glTranslatef(0.0,0.0,0.8*length);
93    glScalef(4.0*length/aspect,4.0*length/aspect,4.0*length/aspect);
94    drawUnitCube();
95    popMatrix(GL_MODELVIEW);
96}
97
98void GpuHelper::drawUnitCube(void)
99{
100    static float vertices[][3] = {
101        {-0.5,-0.5,-0.5},
102        { 0.5,-0.5,-0.5},
103        {-0.5, 0.5,-0.5},
104        { 0.5, 0.5,-0.5},
105        {-0.5,-0.5, 0.5},
106        { 0.5,-0.5, 0.5},
107        {-0.5, 0.5, 0.5},
108        { 0.5, 0.5, 0.5}};
109
110    glBegin(GL_QUADS);
111    glNormal3f(0,0,-1); glVertex3fv(vertices[0]); glVertex3fv(vertices[2]); glVertex3fv(vertices[3]); glVertex3fv(vertices[1]);
112    glNormal3f(0,0, 1); glVertex3fv(vertices[4]); glVertex3fv(vertices[5]); glVertex3fv(vertices[7]); glVertex3fv(vertices[6]);
113    glNormal3f(0,-1,0); glVertex3fv(vertices[0]); glVertex3fv(vertices[1]); glVertex3fv(vertices[5]); glVertex3fv(vertices[4]);
114    glNormal3f(0, 1,0); glVertex3fv(vertices[2]); glVertex3fv(vertices[6]); glVertex3fv(vertices[7]); glVertex3fv(vertices[3]);
115    glNormal3f(-1,0,0); glVertex3fv(vertices[0]); glVertex3fv(vertices[4]); glVertex3fv(vertices[6]); glVertex3fv(vertices[2]);
116    glNormal3f( 1,0,0); glVertex3fv(vertices[1]); glVertex3fv(vertices[3]); glVertex3fv(vertices[7]); glVertex3fv(vertices[5]);
117    glEnd();
118}
119
120void GpuHelper::drawUnitSphere(int level)
121{
122  static IcoSphere sphere;
123  sphere.draw(level);
124}
125
126
127