mirror of
https://github.com/crystalidea/qt6windows7.git
synced 2024-11-23 12:07:03 +08:00
131 lines
2.9 KiB
C++
131 lines
2.9 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
|
|
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
|
|
|
|
#include "openglwindow.h"
|
|
|
|
#include <QGuiApplication>
|
|
#include <QMatrix4x4>
|
|
#include <QOpenGLShaderProgram>
|
|
#include <QScreen>
|
|
#include <QtMath>
|
|
|
|
|
|
//! [1]
|
|
class TriangleWindow : public OpenGLWindow
|
|
{
|
|
public:
|
|
using OpenGLWindow::OpenGLWindow;
|
|
|
|
void initialize() override;
|
|
void render() override;
|
|
|
|
private:
|
|
GLint m_posAttr = 0;
|
|
GLint m_colAttr = 0;
|
|
GLint m_matrixUniform = 0;
|
|
|
|
QOpenGLShaderProgram *m_program = nullptr;
|
|
int m_frame = 0;
|
|
};
|
|
//! [1]
|
|
|
|
//! [2]
|
|
int main(int argc, char **argv)
|
|
{
|
|
QGuiApplication app(argc, argv);
|
|
|
|
QSurfaceFormat format;
|
|
format.setSamples(16);
|
|
|
|
TriangleWindow window;
|
|
window.setFormat(format);
|
|
window.resize(640, 480);
|
|
window.show();
|
|
|
|
window.setAnimating(true);
|
|
|
|
return app.exec();
|
|
}
|
|
//! [2]
|
|
|
|
|
|
//! [3]
|
|
static const char *vertexShaderSource =
|
|
"attribute highp vec4 posAttr;\n"
|
|
"attribute lowp vec4 colAttr;\n"
|
|
"varying lowp vec4 col;\n"
|
|
"uniform highp mat4 matrix;\n"
|
|
"void main() {\n"
|
|
" col = colAttr;\n"
|
|
" gl_Position = matrix * posAttr;\n"
|
|
"}\n";
|
|
|
|
static const char *fragmentShaderSource =
|
|
"varying lowp vec4 col;\n"
|
|
"void main() {\n"
|
|
" gl_FragColor = col;\n"
|
|
"}\n";
|
|
//! [3]
|
|
|
|
//! [4]
|
|
void TriangleWindow::initialize()
|
|
{
|
|
m_program = new QOpenGLShaderProgram(this);
|
|
m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource);
|
|
m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource);
|
|
m_program->link();
|
|
m_posAttr = m_program->attributeLocation("posAttr");
|
|
Q_ASSERT(m_posAttr != -1);
|
|
m_colAttr = m_program->attributeLocation("colAttr");
|
|
Q_ASSERT(m_colAttr != -1);
|
|
m_matrixUniform = m_program->uniformLocation("matrix");
|
|
Q_ASSERT(m_matrixUniform != -1);
|
|
}
|
|
//! [4]
|
|
|
|
//! [5]
|
|
void TriangleWindow::render()
|
|
{
|
|
const qreal retinaScale = devicePixelRatio();
|
|
glViewport(0, 0, width() * retinaScale, height() * retinaScale);
|
|
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
m_program->bind();
|
|
|
|
QMatrix4x4 matrix;
|
|
matrix.perspective(60.0f, 4.0f / 3.0f, 0.1f, 100.0f);
|
|
matrix.translate(0, 0, -2);
|
|
matrix.rotate(100.0f * m_frame / screen()->refreshRate(), 0, 1, 0);
|
|
|
|
m_program->setUniformValue(m_matrixUniform, matrix);
|
|
|
|
static const GLfloat vertices[] = {
|
|
0.0f, 0.707f,
|
|
-0.5f, -0.5f,
|
|
0.5f, -0.5f
|
|
};
|
|
|
|
static const GLfloat colors[] = {
|
|
1.0f, 0.0f, 0.0f,
|
|
0.0f, 1.0f, 0.0f,
|
|
0.0f, 0.0f, 1.0f
|
|
};
|
|
|
|
glVertexAttribPointer(m_posAttr, 2, GL_FLOAT, GL_FALSE, 0, vertices);
|
|
glVertexAttribPointer(m_colAttr, 3, GL_FLOAT, GL_FALSE, 0, colors);
|
|
|
|
glEnableVertexAttribArray(m_posAttr);
|
|
glEnableVertexAttribArray(m_colAttr);
|
|
|
|
glDrawArrays(GL_TRIANGLES, 0, 3);
|
|
|
|
glDisableVertexAttribArray(m_colAttr);
|
|
glDisableVertexAttribArray(m_posAttr);
|
|
|
|
m_program->release();
|
|
|
|
++m_frame;
|
|
}
|
|
//! [5]
|