qt opengl显示qimage 头文件源文件以及pro文件 简单程序

以下是一个简单的Qt OpenGL显示QImage的示例程序，包括头文件、源文件和.pro文件：

**main.cpp:**

#include <QApplication>
#include "glwidget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    GLWidget w;
    w.show();

    return a.exec();
}

**glwidget.h:**

#ifndef GLWIDGET_H
#define GLWIDGET_H

#include <QOpenGLWidget>
#include <QOpenGLFunctions>
#include <QImage>

class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
{
    Q_OBJECT

public:
    GLWidget(QWidget *parent = nullptr);
    ~GLWidget();

protected:
    void initializeGL() override;
    void resizeGL(int width, int height) override;
    void paintGL() override;

private:
    QImage m_image;
    GLuint m_texture;
};

#endif // GLWIDGET_H

**glwidget.cpp:**

#include "glwidget.h"
#include <QOpenGLShaderProgram>
#include <QOpenGLTexture>
#include <QDebug>

GLWidget::GLWidget(QWidget *parent)
    : QOpenGLWidget(parent)
{
    m_image.load(":/image.png");
}

GLWidget::~GLWidget()
{
    makeCurrent();
    glDeleteTextures(1, &m_texture);
    doneCurrent();
}

void GLWidget::initializeGL()
{
    initializeOpenGLFunctions();
    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);

    // Load image into texture
    glGenTextures(1, &m_texture);
    glBindTexture(GL_TEXTURE_2D, m_texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_image.width(), m_image.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, m_image.bits());
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}

void GLWidget::resizeGL(int width, int height)
{
    glViewport(0, 0, width, height);
}

void GLWidget::paintGL()
{
    // Clear background
    glClear(GL_COLOR_BUFFER_BIT);

    // Draw texture
    QOpenGLShaderProgram program;
    program.addShaderFromSourceCode(QOpenGLShader::Vertex, "attribute vec2 position; varying vec2 texCoord; void main() { gl_Position = vec4(position, 0.0, 1.0); texCoord = position * 0.5 + 0.5; }");
    program.addShaderFromSourceCode(QOpenGLShader::Fragment, "uniform sampler2D texture; varying vec2 texCoord; void main() { gl_FragColor = texture2D(texture, texCoord); }");
    program.link();
    program.bind();
    program.setUniformValue("texture", 0);
    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, nullptr);
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    glDisableVertexAttribArray(0);
}

**glwidget.pro:**

QT += opengl

CONFIG += c++11

SOURCES += \
    main.cpp \
    glwidget.cpp

HEADERS += \
    glwidget.h

注意，这个示例程序中使用了一个image.png的图片文件。在项目文件中必须将其添加到资源中，否则会报文件找不到的错误。