comparison: src/gl/gridprogram.cpp
src/gl/gridprogram.cpp
- changeset 53
- 3af627f7a40f
- child 54
- a4055f67b9c7
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| 52:eee644f88e93 | 53:3af627f7a40f |
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| 1 /* | |
| 2 * LDForge: LDraw parts authoring CAD | |
| 3 * Copyright (C) 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 | |
| 19 #include "gridprogram.h" | |
| 20 | |
| 21 // Based on https://stackoverflow.com/q/30842755 | |
| 22 const char vertexShaderSource[] = R"( | |
| 23 #version 330 core | |
| 24 | |
| 25 layout (location = 0) in vec2 in_position; | |
| 26 uniform mat4 view; | |
| 27 uniform mat4 projection; | |
| 28 uniform mat4 model; | |
| 29 smooth out vec2 ex_uv; | |
| 30 const mat4 stretch = mat4(vec4(10000, 0, 0, 0), vec4(0, 10000, 0, 0), vec4(0, 0, 10000, 0), vec4(0, 0, 0, 1)); | |
| 31 | |
| 32 void main() | |
| 33 { | |
| 34 gl_Position = projection * view * model * stretch * vec4(in_position, 0.0, 1.0); | |
| 35 ex_uv = in_position; | |
| 36 } | |
| 37 )"; | |
| 38 | |
| 39 const char fragmentShaderSource[] = R"( | |
| 40 #version 330 core | |
| 41 | |
| 42 out vec4 color; | |
| 43 smooth in vec2 ex_uv; | |
| 44 const vec4 lineColor = vec4(1.0, 1.0, 1.0, 0.75); | |
| 45 | |
| 46 void main(void) | |
| 47 { | |
| 48 if(fract(ex_uv.x / 0.001f) < 0.01f || fract(ex_uv.y / 0.001f) < 0.01f) | |
| 49 color = lineColor; | |
| 50 else | |
| 51 color = vec4(0); | |
| 52 } | |
| 53 )"; | |
| 54 | |
| 55 static const glm::vec2 data[] = {{-1, -1}, {-1, 1}, {1, 1}, {1, -1}}; | |
| 56 | |
| 57 GridProgram::GridProgram(QObject* parent) : | |
| 58 QObject{parent}, | |
| 59 buffer{QOpenGLBuffer::VertexBuffer}, | |
| 60 vertexShader{QOpenGLShader::Vertex}, | |
| 61 fragmentShader{QOpenGLShader::Fragment} | |
| 62 { | |
| 63 } | |
| 64 | |
| 65 void GridProgram::initialize() | |
| 66 { | |
| 67 if (not isInitialized) | |
| 68 { | |
| 69 this->initializeOpenGLFunctions(); | |
| 70 this->isInitialized = true; | |
| 71 this->program.emplace(this); | |
| 72 gl::buildShaders(&*this->program, ::vertexShaderSource, ::fragmentShaderSource); | |
| 73 this->program->bind(); | |
| 74 this->buffer.create(); | |
| 75 this->buffer.bind(); | |
| 76 this->buffer.setUsagePattern(QOpenGLBuffer::StaticDraw); | |
| 77 this->buffer.allocate(data, countof(data) * sizeof data[0]); | |
| 78 this->vertexArrayObject.create(); | |
| 79 this->vertexArrayObject.bind(); | |
| 80 this->program->enableAttributeArray(0); | |
| 81 this->program->setAttributeBuffer(0, GL_FLOAT, 0, 2, 0); | |
| 82 this->vertexArrayObject.release(); | |
| 83 this->buffer.release(); | |
| 84 this->program->release(); | |
| 85 this->checkForGLErrors(); | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 void GridProgram::setViewMatrix(const glm::mat4& newViewMatrix) | |
| 90 { | |
| 91 Q_ASSERT(this->isInitialized); | |
| 92 this->program->bind(); | |
| 93 this->program->setUniformMatrix("view", newViewMatrix); | |
| 94 this->program->release(); | |
| 95 this->checkForGLErrors(); | |
| 96 } | |
| 97 | |
| 98 void GridProgram::setProjectionMatrix(const glm::mat4& newProjectionMatrix) | |
| 99 { | |
| 100 Q_ASSERT(this->isInitialized); | |
| 101 this->program->bind(); | |
| 102 this->program->setUniformMatrix("projection", newProjectionMatrix); | |
| 103 this->program->release(); | |
| 104 this->checkForGLErrors(); | |
| 105 } | |
| 106 | |
| 107 void GridProgram::setModelMatrix(const glm::mat4& newModelMatrix) | |
| 108 { | |
| 109 Q_ASSERT(this->isInitialized); | |
| 110 this->program->bind(); | |
| 111 this->program->setUniformMatrix("model", newModelMatrix); | |
| 112 this->program->release(); | |
| 113 this->checkForGLErrors(); | |
| 114 } | |
| 115 | |
| 116 void GridProgram::draw() | |
| 117 { | |
| 118 this->program->bind(); | |
| 119 this->vertexArrayObject.bind(); | |
| 120 glDrawArrays(GL_QUADS, 0, countof(data)); | |
| 121 this->vertexArrayObject.release(); | |
| 122 this->program->release(); | |
| 123 this->checkForGLErrors(); | |
| 124 } | |
| 125 | |
| 126 void GridProgram::teardown() | |
| 127 { | |
| 128 this->vertexArrayObject.destroy(); | |
| 129 this->buffer.destroy(); | |
| 130 this->program.reset(); | |
| 131 } | |
| 132 | |
| 133 void GridProgram::checkForGLErrors() | |
| 134 { | |
| 135 gl::checkForGLErrors(qobject_cast<QWidget*>(this->parent())); | |
| 136 } |
