Mastering GUI Programming with Python

Creating a program

Our next step in implementing an OpenGL drawing is to create our program. You may remember that an OpenGL program is a collection of shaders that form a complete pipeline.

In Qt, the process to create a program is as follows:

1. Create a QOpenGLShaderProgram object
2. Add your shader code to the program
3. Link the code into a complete program

The following code will implement this:

        self.program = qtg.QOpenGLShaderProgram()        self.program.addShaderFromSourceFile(            qtg.QOpenGLShader.Vertex, 'vertex_shader.glsl')        self.program.addShaderFromSourceFile(            qtg.QOpenGLShader.Fragment, 'fragment_shader.glsl')        self.program.link()

Shaders can be added from files, as we've done here using addShaderFromSourceFile(), or from strings using addShaderFromSourceCode() ...