How do I draw a triangle in OpenGL using C++?

How do I draw a triangle in OpenGL using C++?

To draw a triangle in OpenGL, you need to set up your vertex data and use the appropriate OpenGL functions. First, define the vertices of the triangle.

What are the steps to set up the vertex data?

You need to create a vertex buffer object (VBO) and a vertex array object (VAO). Then, bind them and upload your vertex data.

Can you provide a code snippet for that?

Sure! Here's a simple example:

float vertices[] = {
    -0.5f, -0.5f, 0.0f,
     0.5f, -0.5f, 0.0f,
     0.0f,  0.5f, 0.0f
};

unsigned int VBO, VAO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);

What do I do after setting up the vertex data?

After setting up the vertex data, you can use the glDrawArrays function to render the triangle in your render loop.