Sun, 02 Feb 2020 00:58:59 +0200
added configurable line anti-aliasing
24 | 1 | /* |
2 | * LDForge: LDraw parts authoring CAD | |
3 | * Copyright (C) 2013 - 2020 Teemu Piippo | |
4 | * | |
5 | * This program is free software: you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation, either version 3 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
26 | 19 | #include <GL/glut.h> |
28 | 20 | #include <glm/ext/matrix_transform.hpp> |
21 | #include <glm/ext/matrix_clip_space.hpp> | |
17 | 22 | #include <QMouseEvent> |
26 | 23 | #include <QMessageBox> |
17 | 24 | #include "partrenderer.h" |
25 | ||
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26 | PartRenderer::PartRenderer( |
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27 | Model* model, |
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28 | DocumentManager* documents, |
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29 | const ldraw::ColorTable& colorTable, |
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30 | QWidget* parent) : |
21 | 31 | QOpenGLWidget{parent}, |
32 | model{model}, | |
33 | documents{documents}, | |
26 | 34 | colorTable{colorTable}, |
35 | compiler{new gl::Compiler{this->colorTable, this}} | |
17 | 36 | { |
37 | this->setMouseTracking(true); | |
38 | } | |
39 | ||
26 | 40 | PartRenderer::~PartRenderer() |
41 | { | |
42 | } | |
43 | ||
17 | 44 | void PartRenderer::initializeGL() |
45 | { | |
46 | this->initializeOpenGLFunctions(); | |
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47 | if (glGetError() != GL_NO_ERROR) |
17 | 48 | { |
49 | abort(); | |
50 | } | |
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51 | this->compiler->initialize(); |
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52 | this->compiler->build(this->model, this->documents, this->renderPreferences); |
17 | 53 | this->initialized = true; |
32 | 54 | this->modelQuaternion = glm::angleAxis(glm::radians(30.0f), glm::vec3{-1, 0, 0}); |
55 | this->modelQuaternion *= glm::angleAxis(glm::radians(225.0f), glm::vec3{-0, 1, 0}); | |
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56 | this->updateViewMatrix(); |
30 | 57 | this->update(); |
17 | 58 | } |
59 | ||
60 | void PartRenderer::resizeGL(int width, int height) | |
61 | { | |
28 | 62 | glViewport(0, 0, width, height); |
63 | this->projectionMatrix = glm::perspective( | |
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64 | glm::radians(45.0f), |
28 | 65 | static_cast<float>(width) / static_cast<float>(height), |
66 | 0.1f, | |
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67 | 10000.f); |
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68 | this->compiler->setUniformMatrix("projectionMatrix", this->projectionMatrix); |
17 | 69 | } |
70 | ||
26 | 71 | static GLenum getGlTypeForArrayClass(const gl::ArrayClass vboClass) |
21 | 72 | { |
73 | switch (vboClass) | |
74 | { | |
26 | 75 | case gl::ArrayClass::Lines: |
76 | case gl::ArrayClass::ConditionalLines: | |
21 | 77 | return GL_LINES; |
26 | 78 | case gl::ArrayClass::Triangles: |
21 | 79 | return GL_TRIANGLES; |
26 | 80 | case gl::ArrayClass::Quads: |
21 | 81 | return GL_QUADS; |
82 | } | |
83 | throw std::runtime_error{"Bad vbo class passed to getGlTypeForVboClass"}; | |
84 | } | |
85 | ||
17 | 86 | void PartRenderer::paintGL() |
87 | { | |
26 | 88 | /* |
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89 | glEnable (GL_BLEND); |
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90 | glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
26 | 91 | */ |
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92 | glEnable (GL_DEPTH_TEST); |
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93 | glShadeModel (GL_SMOOTH); |
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94 | glEnable (GL_MULTISAMPLE); |
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95 | if (this->renderPreferences.lineAntiAliasing) |
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96 | { |
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97 | glEnable(GL_LINE_SMOOTH); |
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98 | glHint(GL_LINE_SMOOTH_HINT, GL_NICEST); |
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99 | } |
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100 | else { |
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101 | glDisable(GL_LINE_SMOOTH); |
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102 | } |
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103 | this->renderScene(); |
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104 | } |
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105 | |
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106 | void PartRenderer::renderScene() |
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107 | { |
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108 | const QColor& backgroundColor = this->renderPreferences.backgroundColor; |
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109 | glClearColor( |
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110 | static_cast<float>(backgroundColor.redF()), |
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111 | static_cast<float>(backgroundColor.greenF()), |
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112 | static_cast<float>(backgroundColor.blueF()), |
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113 | 1.0f); |
26 | 114 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
115 | glEnable(GL_DEPTH_TEST); | |
116 | glEnable(GL_POLYGON_OFFSET_FILL); | |
117 | glPolygonOffset(1.0f, 1.0f); | |
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118 | glLineWidth(this->renderPreferences.lineThickness); |
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119 | switch (this->renderPreferences.style) |
18 | 120 | { |
121 | case gl::RenderStyle::Normal: | |
37 | 122 | this->setFragmentStyle(gl::FragmentStyle::Normal); |
123 | this->renderAllArrays(); | |
124 | break; | |
18 | 125 | case gl::RenderStyle::BfcRedGreen: |
37 | 126 | glEnable(GL_CULL_FACE); |
127 | glCullFace(GL_BACK); | |
128 | this->setFragmentStyle(gl::FragmentStyle::BfcGreen); | |
129 | renderVao(gl::ArrayClass::Triangles); | |
130 | renderVao(gl::ArrayClass::Quads); | |
131 | glCullFace(GL_FRONT); | |
132 | this->setFragmentStyle(gl::FragmentStyle::BfcRed); | |
133 | renderVao(gl::ArrayClass::Triangles); | |
134 | renderVao(gl::ArrayClass::Quads); | |
135 | glDisable(GL_CULL_FACE); | |
136 | this->setFragmentStyle(gl::FragmentStyle::Normal); | |
137 | renderVao(gl::ArrayClass::Lines); | |
18 | 138 | case gl::RenderStyle::RandomColors: |
37 | 139 | this->setFragmentStyle(gl::FragmentStyle::RandomColors); |
140 | this->renderAllArrays(); | |
18 | 141 | break; |
142 | case gl::RenderStyle::Wireframe: | |
143 | glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); | |
37 | 144 | this->setFragmentStyle(gl::FragmentStyle::Normal); |
145 | this->renderAllArrays(); | |
18 | 146 | break; |
147 | } | |
37 | 148 | glDisable(GL_POLYGON_OFFSET_FILL); |
149 | } | |
150 | ||
151 | void PartRenderer::renderAllArrays() | |
152 | { | |
26 | 153 | // Lines need to be rendered last so that anti-aliasing does not interfere with polygon rendering. |
154 | renderVao(gl::ArrayClass::Triangles); | |
155 | renderVao(gl::ArrayClass::Quads); | |
156 | renderVao(gl::ArrayClass::Lines); | |
157 | } | |
158 | ||
37 | 159 | |
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160 | void PartRenderer::updateViewMatrix() |
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161 | { |
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162 | // I'm not quite sure why using the exponent function on the zoom factor causes linear zoom behavior |
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163 | const double z = 2 * std::exp(this->zoom) * (1 + this->compiler->modelDistance()); |
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164 | this->viewMatrix = glm::lookAt(glm::vec3{0, 0, z}, {0, 0, 0}, {0, -1, 0}); |
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165 | this->compiler->setUniformMatrix("viewMatrix", this->viewMatrix); |
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166 | } |
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167 | |
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168 | void PartRenderer::renderVao(const gl::ArrayClass arrayClass) |
26 | 169 | { |
170 | this->compiler->bindVertexArray(arrayClass); | |
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171 | const std::size_t vertexCount = this->compiler->vertexCount(arrayClass); |
26 | 172 | glDrawArrays(getGlTypeForArrayClass(arrayClass), 0, static_cast<GLsizei>(vertexCount)); |
173 | this->compiler->releaseVertexArray(arrayClass); | |
174 | this->checkForGLErrors(); | |
175 | } | |
176 | ||
177 | void PartRenderer::checkForGLErrors() | |
178 | { | |
179 | GLenum glError; | |
180 | QStringList errors; | |
181 | while ((glError = glGetError()) != GL_NO_ERROR) | |
21 | 182 | { |
183 | const QString glErrorString = QString::fromLatin1(reinterpret_cast<const char*>(::gluErrorString(glError))); | |
26 | 184 | errors.append(glErrorString); |
185 | } | |
186 | if (not errors.isEmpty()) | |
187 | { | |
21 | 188 | QMessageBox::critical( |
189 | this, | |
190 | tr("Rendering error"), | |
26 | 191 | QString{"Failed to render.\n%1"}.arg(errors.join("\n"))); |
21 | 192 | } |
17 | 193 | } |
194 | ||
195 | void PartRenderer::mouseMoveEvent(QMouseEvent* event) | |
196 | { | |
197 | const bool left = event->buttons() & Qt::LeftButton; | |
198 | const QPointF move = pointToPointF(event->pos()) - this->lastMousePosition; | |
199 | if (left and not move.isNull()) | |
200 | { | |
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201 | // q_x is the rotation of the brick along the vertical y-axis, because turning the |
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202 | // vertical axis causes horizontal (=x) rotation. Likewise q_y is the rotation of the |
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203 | // brick along the horizontal x-axis, which causes vertical rotation. |
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204 | const auto scalar = 0.006f; |
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205 | const float move_x = static_cast<float>(move.x()); |
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206 | const float move_y = static_cast<float>(move.y()); |
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207 | const glm::quat q_x = glm::angleAxis(scalar * move_x, glm::vec3{0, -1, 0}); |
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208 | const glm::quat q_y = glm::angleAxis(scalar * move_y, glm::vec3{-1, 0, 0}); |
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209 | this->modelQuaternion = q_x * q_y * this->modelQuaternion; |
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210 | this->compiler->setUniformMatrix("modelMatrix", glm::mat4_cast(this->modelQuaternion)); |
17 | 211 | this->update(); |
212 | } | |
213 | this->lastMousePosition = pointToPointF(event->pos()); | |
214 | } | |
18 | 215 | |
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216 | void PartRenderer::wheelEvent(QWheelEvent* event) |
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217 | { |
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218 | static constexpr double WHEEL_STEP = 1 / 1000.0; |
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219 | const double move = (-event->angleDelta().y()) * WHEEL_STEP; |
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220 | this->zoom = std::clamp(this->zoom + move, MIN_ZOOM, MAX_ZOOM); |
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221 | this->updateViewMatrix(); |
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222 | this->update(); |
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223 | } |
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224 | |
37 | 225 | /** |
226 | * @brief Changes the color of rendered fragments | |
227 | * @param newFragmentStyle new fragment style to use | |
228 | */ | |
229 | void PartRenderer::setFragmentStyle(gl::FragmentStyle newFragmentStyle) | |
230 | { | |
231 | this->compiler->setUniform("fragmentStyle", static_cast<int>(newFragmentStyle)); | |
232 | } | |
233 | ||
234 | /** | |
235 | * @brief Changes the way the scene is rendered | |
236 | * @param newStyle new render style to use | |
237 | */ | |
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238 | void PartRenderer::setRenderPreferences(const gl::RenderPreferences& newPreferences) |
18 | 239 | { |
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240 | bool mainColorChanged = this->renderPreferences.mainColor != newPreferences.mainColor; |
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241 | bool backgroundColorChanged = this->renderPreferences.backgroundColor != newPreferences.backgroundColor; |
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242 | this->renderPreferences = newPreferences; |
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243 | if (mainColorChanged or backgroundColorChanged) |
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244 | { |
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245 | this->compiler->build(this->model, this->documents, this->renderPreferences); |
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246 | } |
18 | 247 | this->update(); |
248 | } | |
249 |