#ifndef CH1HELLOTRIANGLE_HPP
#define CH1HELLOTRIANGLE_HPP
#include <QGLWidget>
#include <QtGui/QOpenGLFunctions>
#include <QtGui/QOpenGLShaderProgram>
class ch1HelloTriangle
: public QGLWidget,
protected QOpenGLFunctions
{
Q_OBJECT
public:
explicit ch1HelloTriangle
(QWidget *parent
= 0);
protected:
virtual void initializeGL();
void initShaders();
void InitializeVertexBuffer();
virtual void resizeGL(int w, int h);
virtual void paintGL();
private:
QOpenGLShaderProgram program;
GLuint positionBufferObject;
};
#endif // CH1HELLOTRIANGLE_HPP
#ifndef CH1HELLOTRIANGLE_HPP
#define CH1HELLOTRIANGLE_HPP
#include <QGLWidget>
#include <QtGui/QOpenGLFunctions>
#include <QtGui/QOpenGLShaderProgram>
class QWidget;
class ch1HelloTriangle : public QGLWidget, protected QOpenGLFunctions
{
Q_OBJECT
public:
explicit ch1HelloTriangle(QWidget *parent = 0);
protected:
virtual void initializeGL();
void initShaders();
void InitializeVertexBuffer();
virtual void resizeGL(int w, int h);
virtual void paintGL();
private:
QOpenGLShaderProgram program;
GLuint positionBufferObject;
};
#endif // CH1HELLOTRIANGLE_HPP
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#include <locale.h>
#include <QWidget>
#include "ch1HelloTriangle.hpp"
namespace
{
float const vertexPositions[] = {
0.75f, 0.75f, 0.0f, 1.0f,
0.75f, -0.75f, 0.0f, 1.0f,
-0.75f, -0.75f, 0.0f, 1.0f,
};
}
ch1HelloTriangle
::ch1HelloTriangle(QWidget *parent
) :{
}
void ch1HelloTriangle::initializeGL()
{
initializeOpenGLFunctions();
InitializeVertexBuffer();
initShaders();
}
void ch1HelloTriangle::initShaders()
{
// Override system locale until shaders are compiled
setlocale(LC_NUMERIC, "C");
// Compile vertex shader
if (!program.addShaderFromSourceCode(QOpenGLShader::Vertex,
"attribute vec4 position;\n"
"void main()\n"
"{\n"
" gl_Position = position;\n"
"}\n"))
{
close();
}
// Compile fragment shader
if (!program.addShaderFromSourceCode(QOpenGLShader::Fragment,
"out vec4 outputColor;\n"
"void main()\n"
"{\n"
" outputColor = vec4(1.0f, 1.0f, 1.0f, 1.0f);\n"
"}\n"))
{
close();
}
// Link shader pipeline
if (!program.link())
close();
// Bind shader pipeline for use
if (!program.bind())
close();
// Restore system locale
setlocale(LC_ALL, "");
}
void ch1HelloTriangle::InitializeVertexBuffer()
{
glGenBuffers(1, &positionBufferObject);
glBindBuffer(GL_ARRAY_BUFFER, positionBufferObject);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertexPositions), vertexPositions, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
void ch1HelloTriangle::resizeGL(int w, int h)
{
// Set OpenGL viewport to cover whole widget
glViewport(0, 0, w, h);
}
void ch1HelloTriangle::paintGL()
{
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glBindBuffer(GL_ARRAY_BUFFER, positionBufferObject);
int vertexLocation = program.attributeLocation("position");
program.enableAttributeArray(vertexLocation);
glVertexAttribPointer(vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glDrawArrays(GL_TRIANGLES, 0, 3);
}
#include <locale.h>
#include <QWidget>
#include "ch1HelloTriangle.hpp"
namespace
{
float const vertexPositions[] = {
0.75f, 0.75f, 0.0f, 1.0f,
0.75f, -0.75f, 0.0f, 1.0f,
-0.75f, -0.75f, 0.0f, 1.0f,
};
}
ch1HelloTriangle::ch1HelloTriangle(QWidget *parent) :
QGLWidget(parent)
{
}
void ch1HelloTriangle::initializeGL()
{
initializeOpenGLFunctions();
InitializeVertexBuffer();
initShaders();
}
void ch1HelloTriangle::initShaders()
{
// Override system locale until shaders are compiled
setlocale(LC_NUMERIC, "C");
// Compile vertex shader
if (!program.addShaderFromSourceCode(QOpenGLShader::Vertex,
"attribute vec4 position;\n"
"void main()\n"
"{\n"
" gl_Position = position;\n"
"}\n"))
{
close();
}
// Compile fragment shader
if (!program.addShaderFromSourceCode(QOpenGLShader::Fragment,
"out vec4 outputColor;\n"
"void main()\n"
"{\n"
" outputColor = vec4(1.0f, 1.0f, 1.0f, 1.0f);\n"
"}\n"))
{
close();
}
// Link shader pipeline
if (!program.link())
close();
// Bind shader pipeline for use
if (!program.bind())
close();
// Restore system locale
setlocale(LC_ALL, "");
}
void ch1HelloTriangle::InitializeVertexBuffer()
{
glGenBuffers(1, &positionBufferObject);
glBindBuffer(GL_ARRAY_BUFFER, positionBufferObject);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertexPositions), vertexPositions, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
void ch1HelloTriangle::resizeGL(int w, int h)
{
// Set OpenGL viewport to cover whole widget
glViewport(0, 0, w, h);
}
void ch1HelloTriangle::paintGL()
{
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glBindBuffer(GL_ARRAY_BUFFER, positionBufferObject);
int vertexLocation = program.attributeLocation("position");
program.enableAttributeArray(vertexLocation);
glVertexAttribPointer(vertexLocation, 4, GL_FLOAT, GL_FALSE, 0, 0);
glDrawArrays(GL_TRIANGLES, 0, 3);
}
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