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#include "curveglwidget.h"
1		#include "curveglwidget.h"
2
3		CurveGLWidget::CurveGLWidget(QWidget* parent):QOpenGLWidget(parent), m_vao(this)
4		{
5		m_drawMode = GL_LINE_STRIP;
6		}
7
8		CurveGLWidget::~CurveGLWidget()
9		{
10
11		}
12
13		void CurveGLWidget::initializeGL()
14		{
15		initializeOpenGLFunctions();
16		loadShaders();
17		initialize();
18		}
19
20		void CurveGLWidget::initialize()
21		{
22		m_vao.create();
23		m_vbo.create();
24		m_vbo.setUsagePattern(QOpenGLBuffer::StreamDraw);
25		}
26
27
28		void CurveGLWidget::updateVertices()
29		{
30		m_vao.bind();
31		m_vbo.bind();
32
33		m_vbo.allocate(vertices.size() * sizeof(Vertex));
34		m_vbo.write(0, &vertices.begin(), vertices.size() * sizeof(Vertex));
35
36		m_program.enableAttributeArray("position");
37		m_program.setAttributeBuffer("position", GL_FLOAT, 0, 2, sizeof(Vertex));
38
39		m_program.enableAttributeArray("color");
40		m_program.setAttributeBuffer("color", GL_FLOAT, sizeof(glm::vec2), 4, sizeof(Vertex));
41
42		m_vao.release();
43		m_vbo.release();
44		}
45
46
47
48		void CurveGLWidget::loadShaders()
49		{
50		if (!m_program.addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSrc)) {
51		qDebug() << "Error binding vertex shader: " << m_program.log();
52		}
53
54		if (!m_program.addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSrc)) {
55		qDebug() << "Error binding fragment shader: " << m_program.log();
56		}
57
58		if (!m_program.link()) {
59		qDebug() << "Could not link program: " << m_program.log();
60		}
61
62		m_program.attributeLocation("position");
63		m_program.attributeLocation("color");
64		}
65
66		void CurveGLWidget::resizeGL(int w, int h)
67		{
68		glViewport(0, 0, w, h);
69		}
70
71		void CurveGLWidget::setClearColor(glm::vec4 color)
72		{
73		m_clearColor = color;
74		update();
75		}
76
77		void CurveGLWidget::setDrawMode(GLenum mode)
78		{
79		m_drawMode = mode;
80		update();
81		}
82
83		void CurveGLWidget::paintGL()
84		{
85		if (vertices.size() < 2) {
86		return;
87		}
88		updateVertices();
89		glClearColor(m_clearColor.r, m_clearColor.g, m_clearColor.b, m_clearColor.a);
90		glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
91	-	qDebug() << "----------";
91	+
92	-	for (int i = 0; i < vertices.size(); i++) {
92	+
93	-	qDebug() << "Vertex[" << i << "] = [" << vertices[i].position.x << "," << vertices[i].position.y << "]";
93	+
94		m_vao.release();
95	-	qDebug() << "----------";
95	+
96		}
97	-	glPointSize(5.0);
97	+
98		void CurveGLWidget::onDrawModeChanged()
99		{
100
101		}
102
103		void CurveGLWidget::mousePressEvent(QMouseEvent* e)
104		{
105
106		float glX = scale(0, width(), -1, 1, e->x());
107		float glY = scale(0, height(), -1, 1, e->y());
108
109		Vertex v;
110		v.position.x = glX;
111		v.position.y = glY;
112		v.color.r = 1.0f;
113		v.color.g = 1.0f;
114		v.color.b = 1.0f;
115		v.color.a = 1.0f;
116
117
118		vertices.push_back(v);
119
120
121
122		updateVertices();
123
124		update();
125		}
126
127
128		float CurveGLWidget::scale(float domainStart, float domainEnd, float rangeStart, float rangeEnd, float value)
129		{
130
131		float rangeInterval = abs(rangeEnd - rangeStart);
132		float domainInterval = abs(domainEnd - domainStart);
133		float u = (value - domainStart) / domainInterval;
134
135
136		return rangeStart + u * rangeInterval;
137		}