OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 4.3, Eighth Edition

Our First OpenGL Rendering

With all that setup and data initialization, rendering (for the moment) will be very simple. While our display() routine is only four lines long, its sequence of operations is virtually the same in all OpenGL applications. Here it is once again.

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void display(void){    glClear(GL_COLOR_BUFFER_BIT);    glBindVertexArray(VAOs[Triangles]);    glDrawArrays(GL_TRIANGLES, 0, NumVertices);    glFlush();}

First, we begin rendering by clearing our framebuffer. This is done by calling glClear().

void glClear(GLbitfield mask);

Clears the specified buffers to their current clearing values. The mask argument is a bitwise logical OR combination of the values listed in Table 1.3.

Table 1.3. Clearing ...