src/gl/compiler.cpp

Wed, 22 Jan 2020 01:17:11 +0200

author
Teemu Piippo <teemu@hecknology.net>
date
Wed, 22 Jan 2020 01:17:11 +0200
changeset 27
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child 28
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permissions
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1 /*
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2 * LDForge: LDraw parts authoring CAD
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3 * Copyright (C) 2013 - 2018 Teemu Piippo
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4 *
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5 * This program is free software: you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation, either version 3 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18
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19 #define GL_GLEXT_PROTOTYPES
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20 #include <GL/glu.h>
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21 #include <GL/glext.h>
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22 #include <QMessageBox>
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23 #include "gl/compiler.h"
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24 #include "documentmanager.h"
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25 #include "invert.h"
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26 #include "ring.h"
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27
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28 static const char* vertexShaderSource = R"(
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29 #version 330 core
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30
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31 layout(location=0) in vec3 position;
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32 layout(location=1) in vec4 color;
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33 out vec4 vColor;
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34 uniform mat4 CameraTransformation;
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35
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36 void main()
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37 {
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38 vColor = color;
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39 gl_Position = projection * modelview * CameraTransformation * vec4(position, 1.0);
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40 }
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41 )";
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42
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43 static const char* fragmentShaderSource = R"(
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44 #version 330 core
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45
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46 in vec4 vColor;
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47 out vec4 fColor;
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48
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49 void main()
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50 {
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51 fColor = vColor;
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52 }
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53 )";
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54
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55 gl::Compiler::Compiler(const ColorTable& colorTable, QObject* parent) :
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56 QObject{parent},
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57 colorTable{colorTable}
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58 {
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59 }
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60
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61 gl::Compiler::~Compiler()
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62 {
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63 }
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64
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65 void gl::Compiler::initialize()
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66 {
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67 if (not this->initialized)
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68 {
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69 this->initializeOpenGLFunctions();
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70 for (int i = 0; i < gl::NUM_ARRAY_CLASSES; i += 1)
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71 {
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72 auto& object = this->glObjects[i];
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73 object.program = new QOpenGLShaderProgram;
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74 object.program->create();
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75 object.program->addShaderFromSourceCode(QOpenGLShader::Vertex, ::vertexShaderSource);
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76 object.program->addShaderFromSourceCode(QOpenGLShader::Fragment, ::fragmentShaderSource);
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77 object.program->link();
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78 object.program->bind();
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79 object.buffer.create();
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80 object.buffer.bind();
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81 object.buffer.setUsagePattern(QOpenGLBuffer::DynamicDraw);
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82 object.vertexArray.create();
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83 object.vertexArray.bind();
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84 object.program->enableAttributeArray(0);
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85 object.program->enableAttributeArray(1);
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86 object.program->setAttributeBuffer(0, GL_FLOAT, 0, 3);
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87 object.program->setAttributeBuffer(1, GL_FLOAT, 3, 4);
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88 object.vertexArray.release();
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89 object.buffer.release();
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90 object.program->release();
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91 }
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92 this->initialized = true;
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93 }
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94 }
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95
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96 void gl::Compiler::build(Model* model, DocumentManager* context)
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97 {
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98 this->boundingBox = {};
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99 std::vector<GLfloat> vboData[gl::NUM_ARRAY_CLASSES];
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100 const std::vector<gl::Polygon> polygons = model->getPolygons(context);
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101 for (const gl::Polygon& polygon : polygons)
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102 {
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103 this->buildPolygon(polygon, vboData);
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104 }
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105 for (int arrayId = 0; arrayId < gl::NUM_ARRAY_CLASSES; arrayId += 1)
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106 {
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107 auto& buffer = this->glObjects[arrayId].buffer;
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108 auto& vector = vboData[arrayId];
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109 this->storedVboSizes[arrayId] = vector.size();
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110 buffer.bind();
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111 buffer.allocate(vector.data(), static_cast<int>(vector.size() * sizeof vector[0]));
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112 buffer.release();
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113 }
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114 }
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115
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116 gl::ArrayClass classifyPolygon(const gl::Polygon& polygon)
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117 {
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118 switch (polygon.type)
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119 {
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120 case gl::Polygon::EdgeLine:
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121 return gl::ArrayClass::Lines;
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122 case gl::Polygon::Triangle:
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123 return gl::ArrayClass::Triangles;
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124 case gl::Polygon::Quadrilateral:
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125 return gl::ArrayClass::Quads;
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126 case gl::Polygon::ConditionalEdge:
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127 return gl::ArrayClass::ConditionalLines;
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128 }
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129 return gl::ArrayClass::Lines;
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130 }
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131
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132 [[maybe_unused]]
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133 static QColor colorFromId(linetypes::Id id)
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134 {
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135 // Calculate a color based from this index. This method caters for
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136 // 16777216 objects. I don't think that will be exceeded anytime soon.
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137 const int r = (id.value / 0x10000) % 0x100;
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138 const int g = (id.value / 0x100) % 0x100;
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139 const int b = id.value % 0x100;
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140 return {r, g, b};
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141 }
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142
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143 void gl::Compiler::buildPolygon(gl::Polygon polygon, std::vector<GLfloat>* vboData)
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144 {
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145 const gl::ArrayClass vboClass = classifyPolygon(polygon);
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146 //std::vector<GLfloat>& vertexBuffer = vboData[gl::vboIndex({vboClass, gl::VboSubclass::VertexData})];
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147 std::vector<GLfloat>& vertexBuffer = vboData[static_cast<int>(vboClass)];
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148 /*
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149 std::vector<GLfloat>& normalsBuffer = vboData[gl::vboIndex({vboClass, gl::VboSubclass::Normals})];
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150 auto vertexRing = iter::ring(polygon.vertices, polygon.numPolygonVertices());
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151 reserveMore(normalsBuffer, polygon.numPolygonVertices() * 3_z);
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152 for (unsigned int i = 0; i < polygon.numPolygonVertices(); i += 1)
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153 {
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154 const Point3D& v1 = vertexRing[i - 1];
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155 const Point3D& v2 = vertexRing[i];
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156 const Point3D& v3 = vertexRing[i + 1];
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157 const QVector3D normal = QVector3D::crossProduct(v3 - v2, v1 - v2).normalized();
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158 for (const GLfloat coord : {normal.x(), normal.y(), normal.z()})
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159 normalsBuffer.push_back(coord);
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160 }
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161 */
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162 reserveMore(vertexBuffer, polygon.numPolygonVertices() * 7);
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163 const QColor color = this->getColorForPolygon(polygon);
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164 // Transform vertices so that they're suitable for GL rendering
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165 for (unsigned int i = 0; i < polygon.numPolygonVertices(); i += 1)
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166 {
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167 Point3D& point = polygon.vertices[i];
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168 polygon.vertices[i].y = -polygon.vertices[i].y;
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169 polygon.vertices[i].z = -polygon.vertices[i].z;
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170 this->boundingBox.consider(polygon.vertices[i]);
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171 vertexBuffer.push_back(static_cast<GLfloat>(point.x));
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172 vertexBuffer.push_back(static_cast<GLfloat>(point.y));
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173 vertexBuffer.push_back(static_cast<GLfloat>(point.z));
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174 vertexBuffer.push_back(static_cast<GLfloat>(color.redF()));
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175 vertexBuffer.push_back(static_cast<GLfloat>(color.greenF()));
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176 vertexBuffer.push_back(static_cast<GLfloat>(color.blueF()));
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177 vertexBuffer.push_back(static_cast<GLfloat>(color.alphaF()));
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178 }
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179 }
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180
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181 QColor gl::Compiler::getColorForPolygon(const gl::Polygon& polygon)
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182 {
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183 QColor color;
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184 // For normal colors, use the polygon's color.
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185 if (polygon.color == colors::main)
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186 {
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187 color = {255, 255, 64}; // mainColorRepresentation();
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188 }
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189 else if (polygon.color == colors::edge)
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190 {
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191 // Edge color is black, unless we have a dark background, in which case lines need to be bright.
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192 color = Qt::black; //luma(config::backgroundColor()) > 40 ? Qt::black : Qt::white;
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193 }
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194 else
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195 {
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196 // Not main or edge color, use the polygon's color as is.
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197 color = this->colorTable[polygon.color].faceColor;
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198 }
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199 return color;
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200 }
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201
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202 Point3D gl::Compiler::modelCenter() const
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203 {
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204 return boxCenter(this->boundingBox);
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205 }
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206
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207 double gl::Compiler::modelDistance() const
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208 {
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209 return longestMeasure(this->boundingBox);
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210 }
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211
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212 void gl::Compiler::bindVertexArray(gl::ArrayClass arrayClass)
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213 {
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214 auto& object = this->glObjects[static_cast<int>(arrayClass)];
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215 object.vertexArray.bind();
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216 object.program->bind();
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217 }
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218
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219 void gl::Compiler::releaseVertexArray(gl::ArrayClass arrayClass)
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220 {
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221 auto& object = this->glObjects[static_cast<int>(arrayClass)];
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222 object.program->release();
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223 object.vertexArray.release();
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224 }
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225
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226 std::size_t gl::Compiler::vboSize(const gl::ArrayClass arrayClass) const
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227 {
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228 return this->storedVboSizes[static_cast<int>(arrayClass)];
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229 }
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230
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231 int gl::vboIndex(const VboAddress vboAddress)
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232 {
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233 return static_cast<std::uint8_t>(vboAddress.vboClass) * gl::numVboSubclasses
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234 + static_cast<std::uint8_t>(vboAddress.vboSubclass);
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235 }

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