Thu, 06 Feb 2020 23:41:20 +0200
picking works now
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> |
47 | 24 | #include <QAbstractButton> |
17 | 25 | #include "partrenderer.h" |
26 | ||
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27 | PartRenderer::PartRenderer( |
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28 | Model* model, |
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29 | DocumentManager* documents, |
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30 | const ldraw::ColorTable& colorTable, |
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31 | QWidget* parent) : |
21 | 32 | QOpenGLWidget{parent}, |
33 | model{model}, | |
34 | documents{documents}, | |
26 | 35 | colorTable{colorTable}, |
36 | compiler{new gl::Compiler{this->colorTable, this}} | |
17 | 37 | { |
38 | this->setMouseTracking(true); | |
39 | } | |
40 | ||
26 | 41 | PartRenderer::~PartRenderer() |
42 | { | |
43 | } | |
44 | ||
17 | 45 | void PartRenderer::initializeGL() |
46 | { | |
47 | this->initializeOpenGLFunctions(); | |
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48 | if (glGetError() != GL_NO_ERROR) |
17 | 49 | { |
50 | abort(); | |
51 | } | |
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52 | this->compiler->initialize(); |
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53 | this->compiler->build(this->model, this->documents, this->renderPreferences); |
17 | 54 | this->initialized = true; |
32 | 55 | this->modelQuaternion = glm::angleAxis(glm::radians(30.0f), glm::vec3{-1, 0, 0}); |
56 | this->modelQuaternion *= glm::angleAxis(glm::radians(225.0f), glm::vec3{-0, 1, 0}); | |
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57 | this->updateViewMatrix(); |
30 | 58 | this->update(); |
17 | 59 | } |
60 | ||
61 | void PartRenderer::resizeGL(int width, int height) | |
62 | { | |
28 | 63 | glViewport(0, 0, width, height); |
64 | this->projectionMatrix = glm::perspective( | |
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65 | glm::radians(45.0f), |
28 | 66 | static_cast<float>(width) / static_cast<float>(height), |
67 | 0.1f, | |
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68 | 10000.f); |
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69 | this->compiler->setUniformMatrix("projectionMatrix", this->projectionMatrix); |
17 | 70 | } |
71 | ||
26 | 72 | static GLenum getGlTypeForArrayClass(const gl::ArrayClass vboClass) |
21 | 73 | { |
74 | switch (vboClass) | |
75 | { | |
26 | 76 | case gl::ArrayClass::Lines: |
77 | case gl::ArrayClass::ConditionalLines: | |
21 | 78 | return GL_LINES; |
26 | 79 | case gl::ArrayClass::Triangles: |
21 | 80 | return GL_TRIANGLES; |
26 | 81 | case gl::ArrayClass::Quads: |
21 | 82 | return GL_QUADS; |
83 | } | |
84 | throw std::runtime_error{"Bad vbo class passed to getGlTypeForVboClass"}; | |
85 | } | |
86 | ||
17 | 87 | void PartRenderer::paintGL() |
88 | { | |
47 | 89 | glEnable(GL_DEPTH_TEST); |
90 | glShadeModel(GL_SMOOTH); | |
91 | glEnable(GL_MULTISAMPLE); | |
92 | this->renderScene(); | |
93 | } | |
94 | ||
95 | void PartRenderer::renderScene() | |
96 | { | |
46 | 97 | if (this->renderPreferences.lineAntiAliasing && this->renderPreferences.style != gl::RenderStyle::PickScene) |
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98 | { |
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99 | glEnable(GL_LINE_SMOOTH); |
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100 | glHint(GL_LINE_SMOOTH_HINT, GL_NICEST); |
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101 | } |
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102 | else { |
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103 | glDisable(GL_LINE_SMOOTH); |
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104 | } |
46 | 105 | if (this->renderPreferences.style != gl::RenderStyle::PickScene) |
106 | { | |
47 | 107 | const QColor& backgroundColor = this->renderPreferences.backgroundColor; |
46 | 108 | glClearColor( |
109 | static_cast<float>(backgroundColor.redF()), | |
110 | static_cast<float>(backgroundColor.greenF()), | |
111 | static_cast<float>(backgroundColor.blueF()), | |
112 | 1.0f); | |
113 | this->compiler->setUniform("useLighting", true); | |
114 | } | |
115 | else | |
116 | { | |
117 | glClearColor(0.0f, 0.0f, 0.0f, 1.0f); | |
118 | this->compiler->setUniform("useLighting", false); | |
119 | } | |
26 | 120 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
121 | glEnable(GL_DEPTH_TEST); | |
122 | glEnable(GL_POLYGON_OFFSET_FILL); | |
123 | glPolygonOffset(1.0f, 1.0f); | |
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124 | glLineWidth(this->renderPreferences.lineThickness); |
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125 | switch (this->renderPreferences.style) |
18 | 126 | { |
127 | case gl::RenderStyle::Normal: | |
37 | 128 | this->setFragmentStyle(gl::FragmentStyle::Normal); |
129 | this->renderAllArrays(); | |
130 | break; | |
18 | 131 | case gl::RenderStyle::BfcRedGreen: |
37 | 132 | glEnable(GL_CULL_FACE); |
133 | glCullFace(GL_BACK); | |
134 | this->setFragmentStyle(gl::FragmentStyle::BfcGreen); | |
135 | renderVao(gl::ArrayClass::Triangles); | |
136 | renderVao(gl::ArrayClass::Quads); | |
137 | glCullFace(GL_FRONT); | |
138 | this->setFragmentStyle(gl::FragmentStyle::BfcRed); | |
139 | renderVao(gl::ArrayClass::Triangles); | |
140 | renderVao(gl::ArrayClass::Quads); | |
141 | glDisable(GL_CULL_FACE); | |
142 | this->setFragmentStyle(gl::FragmentStyle::Normal); | |
143 | renderVao(gl::ArrayClass::Lines); | |
18 | 144 | case gl::RenderStyle::RandomColors: |
37 | 145 | this->setFragmentStyle(gl::FragmentStyle::RandomColors); |
146 | this->renderAllArrays(); | |
18 | 147 | break; |
46 | 148 | case gl::RenderStyle::PickScene: |
149 | glLineWidth(3.0f); | |
150 | this->setFragmentStyle(gl::FragmentStyle::Id); | |
151 | this->renderAllArrays(); | |
152 | break; | |
18 | 153 | case gl::RenderStyle::Wireframe: |
154 | glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); | |
37 | 155 | this->setFragmentStyle(gl::FragmentStyle::Normal); |
156 | this->renderAllArrays(); | |
18 | 157 | break; |
158 | } | |
37 | 159 | glDisable(GL_POLYGON_OFFSET_FILL); |
160 | } | |
161 | ||
162 | void PartRenderer::renderAllArrays() | |
163 | { | |
26 | 164 | // Lines need to be rendered last so that anti-aliasing does not interfere with polygon rendering. |
165 | renderVao(gl::ArrayClass::Triangles); | |
166 | renderVao(gl::ArrayClass::Quads); | |
167 | renderVao(gl::ArrayClass::Lines); | |
168 | } | |
169 | ||
37 | 170 | |
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171 | void PartRenderer::updateViewMatrix() |
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172 | { |
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173 | // I'm not quite sure why using the exponent function on the zoom factor causes linear zoom behavior |
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174 | const double z = 2 * std::exp(this->zoom) * (1 + this->compiler->modelDistance()); |
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175 | this->viewMatrix = glm::lookAt(glm::vec3{0, 0, z}, {0, 0, 0}, {0, -1, 0}); |
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176 | this->compiler->setUniformMatrix("viewMatrix", this->viewMatrix); |
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177 | } |
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178 | |
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179 | void PartRenderer::renderVao(const gl::ArrayClass arrayClass) |
26 | 180 | { |
181 | this->compiler->bindVertexArray(arrayClass); | |
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182 | const std::size_t vertexCount = this->compiler->vertexCount(arrayClass); |
26 | 183 | glDrawArrays(getGlTypeForArrayClass(arrayClass), 0, static_cast<GLsizei>(vertexCount)); |
184 | this->compiler->releaseVertexArray(arrayClass); | |
185 | this->checkForGLErrors(); | |
186 | } | |
187 | ||
188 | void PartRenderer::checkForGLErrors() | |
189 | { | |
190 | GLenum glError; | |
191 | QStringList errors; | |
192 | while ((glError = glGetError()) != GL_NO_ERROR) | |
21 | 193 | { |
194 | const QString glErrorString = QString::fromLatin1(reinterpret_cast<const char*>(::gluErrorString(glError))); | |
26 | 195 | errors.append(glErrorString); |
196 | } | |
197 | if (not errors.isEmpty()) | |
198 | { | |
47 | 199 | QMessageBox box{this}; |
200 | box.setIcon(QMessageBox::Critical); | |
201 | box.setText(tr("Failed to render: %1").arg(errors.join("\n"))); | |
202 | box.setWindowTitle(tr("Rendering error")); | |
203 | box.setStandardButtons(QMessageBox::Close); | |
204 | box.button(QMessageBox::Close)->setText(tr("Damn it")); | |
205 | box.exec(); | |
21 | 206 | } |
17 | 207 | } |
208 | ||
209 | void PartRenderer::mouseMoveEvent(QMouseEvent* event) | |
210 | { | |
211 | const bool left = event->buttons() & Qt::LeftButton; | |
212 | const QPointF move = pointToPointF(event->pos()) - this->lastMousePosition; | |
213 | if (left and not move.isNull()) | |
214 | { | |
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215 | // q_x is the rotation of the brick along the vertical y-axis, because turning the |
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216 | // vertical axis causes horizontal (=x) rotation. Likewise q_y is the rotation of the |
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217 | // brick along the horizontal x-axis, which causes vertical rotation. |
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218 | const auto scalar = 0.006f; |
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219 | const float move_x = static_cast<float>(move.x()); |
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220 | const float move_y = static_cast<float>(move.y()); |
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221 | const glm::quat q_x = glm::angleAxis(scalar * move_x, glm::vec3{0, -1, 0}); |
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222 | const glm::quat q_y = glm::angleAxis(scalar * move_y, glm::vec3{-1, 0, 0}); |
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223 | this->modelQuaternion = q_x * q_y * this->modelQuaternion; |
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224 | this->compiler->setUniformMatrix("modelMatrix", glm::mat4_cast(this->modelQuaternion)); |
17 | 225 | this->update(); |
226 | } | |
227 | this->lastMousePosition = pointToPointF(event->pos()); | |
228 | } | |
18 | 229 | |
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230 | void PartRenderer::wheelEvent(QWheelEvent* event) |
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231 | { |
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232 | static constexpr double WHEEL_STEP = 1 / 1000.0; |
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233 | const double move = (-event->angleDelta().y()) * WHEEL_STEP; |
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234 | this->zoom = std::clamp(this->zoom + move, MIN_ZOOM, MAX_ZOOM); |
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235 | this->updateViewMatrix(); |
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236 | this->update(); |
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237 | } |
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238 | |
47 | 239 | ldraw::Id PartRenderer::pick(const QPoint& where) |
240 | { | |
241 | const gl::RenderStyle oldRenderStyle = this->renderPreferences.style; | |
242 | this->renderPreferences.style = gl::RenderStyle::PickScene; | |
243 | this->makeCurrent(); | |
244 | this->renderScene(); | |
245 | std::array<GLbyte, 3> data; | |
246 | glReadPixels(where.x(), this->height() - where.y(), 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &data[0]); | |
247 | this->renderPreferences.style = oldRenderStyle; | |
248 | this->update(); | |
249 | return gl::Compiler::idFromColor(data); | |
250 | } | |
251 | ||
37 | 252 | /** |
253 | * @brief Changes the color of rendered fragments | |
254 | * @param newFragmentStyle new fragment style to use | |
255 | */ | |
256 | void PartRenderer::setFragmentStyle(gl::FragmentStyle newFragmentStyle) | |
257 | { | |
258 | this->compiler->setUniform("fragmentStyle", static_cast<int>(newFragmentStyle)); | |
259 | } | |
260 | ||
261 | /** | |
262 | * @brief Changes the way the scene is rendered | |
263 | * @param newStyle new render style to use | |
264 | */ | |
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265 | void PartRenderer::setRenderPreferences(const gl::RenderPreferences& newPreferences) |
18 | 266 | { |
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267 | bool mainColorChanged = this->renderPreferences.mainColor != newPreferences.mainColor; |
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268 | bool backgroundColorChanged = this->renderPreferences.backgroundColor != newPreferences.backgroundColor; |
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269 | this->renderPreferences = newPreferences; |
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270 | if (mainColorChanged or backgroundColorChanged) |
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271 | { |
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272 | this->compiler->build(this->model, this->documents, this->renderPreferences); |
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273 | } |
18 | 274 | this->update(); |
275 | } | |
276 |