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#version 330 core
layo…一般而言改变物体的位置时需要改变每一帧所有顶点的坐标计算量巨大 可以将每一个顶点用向量值表示使用位移矩阵缩放矩阵旋转矩阵对顶点进行操作。 顶点着色器
#version 330 core
layout(location 0) in vec3 aPos;
layout(location 1) in vec3 aColor;
layout(location 2) in vec2 aTexCord;
out vec3 ourColor;
out vec2 TexCord;
uniform mat4 theMatrix;
void main(){gl_Position theMatrix*vec4(aPos.x, aPos.y, aPos.z, 1.0f);ourColoraColor;TexCordvec2(aTexCord.s,aTexCord.t);
}片段着色器
#version 330 core
out vec4 FragColor;
in vec3 ourColor;
in vec2 TexCord;
uniform sampler2D textureWall;
uniform sampler2D textureSmile;
uniform sampler2D textureSmall;
uniform float ratio;
void main(){FragColor mix(texture(textureWall,TexCord),texture(textureSmile,TexCord),ratio);
}核心代码
void MatrixGlWgt::initializeGL() {initializeOpenGLFunctions();//创建VBO和VAO对象并赋予IDglGenVertexArrays(1, VAO);glGenBuffers(1, VBO);//绑定VBO和VAO对象glBindVertexArray(VAO);glBindBuffer(GL_ARRAY_BUFFER, VBO);//为当前绑定到target的缓冲区对象创建一个新的数据存储。//如果data不是NULL则使用来自此指针的数据初始化数据存储glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);//告知显卡如何解析缓冲里的属性值glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);//开启VAO管理的第一个属性值glEnableVertexAttribArray(0);glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));glEnableVertexAttribArray(1);glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));glEnableVertexAttribArray(2);glBindBuffer(GL_ARRAY_BUFFER, 0);bool success;shaderProgram.addShaderFromSourceFile(QOpenGLShader::Vertex, shaders/shapes.vert);shaderProgram.addShaderFromSourceFile(QOpenGLShader::Fragment, shaders/shapes.frag);success shaderProgram.link();if (!success)qDebug() ERR: shaderProgram.log();glGenBuffers(1, EBO);glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);glEnable(GL_BLEND);glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);textureWall new QOpenGLTexture(QImage(images/wall.jpg).mirrored());textureSmile new QOpenGLTexture(QImage(images/awesomeface.png).mirrored());textureSmall new QOpenGLTexture(QImage(images/small.png).mirrored());shaderProgram.bind();shaderProgram.setUniformValue(textureWall, 0);shaderProgram.setUniformValue(textureSmile, 1);shaderProgram.setUniformValue(textureSmall, 2);textureSmall-generateMipMaps();textureSmile-bind(1);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);glBindVertexArray(0);
}
void MatrixGlWgt::resizeGL(int w, int h) {Q_UNUSED(w); Q_UNUSED(h);
}
void MatrixGlWgt::paintGL() {glClearColor(0.2f, 0.3f, 0.3f, 1.0f);glClear(GL_COLOR_BUFFER_BIT);shaderProgram.bind();shaderProgram.setUniformValue(ratio, ratio);shaderProgram.setUniformValue(theMatrix, matrix);glBindVertexArray(VAO);textureWall-bind(0);textureSmile-bind(1);textureSmall-bind(2);glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, NULL);
}
void MatrixGlWgt::on_timeout() {matrix.setToIdentity();unsigned int time QTime::currentTime().msec();matrix.translate(0.5, 0, 0);matrix.rotate(time, 0.0f, 0.0f, 1.0f);update();
}坐标信息
float vertices[] {// positions // colors // texture coords0.3f, 0.3f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top right0.3f, -0.3f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom right-0.3f, -0.3f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom left-0.3f, 0.3f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f // top left
};
unsigned int indices[] { // note that we start from 0!0, 1, 3, // first triangle1, 2, 3 // second triangle
};
