c++ - Draw points in OpenGL with QVector3D

Question

I have a list of QVector3D, which is a list of points, I want to draw a list of points with glDrawArrays.

initializeGLFunctions();

glGenBuffers(2, vbo);
//the vertices 
QVector3D *vertices = &data[0];

glBindBuffer(GL_ARRAY_BUFFER, vbo[0]);
glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(QVector3D), vertices, GL_STATIC_DRAW);

glDrawArrays(GL_POINTS,??);

or what other method I can use to deal with this?

Answer 1

glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(QVector3D), 顶点, GL_STATIC_DRAW);

这是正确的，但我建议在 constData 之外使用更智能的容器，如 QVector，如下所示：

glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(QVector3D), myVector.constData(), GL_STATIC_DRAW);

这是另一个官方示例如何glBufferData在上下文中使用QVector3D：

geometryengine.cpp 示例文件

在官方示例之后，您可以在此处找到另一个第三方示例：

FabScan100

然后，你可以写：

glDrawArrays(GL_POINTS, 0, data.size());