How can I generate a view or projection matrix for OpenGL 3.+
- by Ken
I'm transitioning from OpenGL 2 to OpenGL 3.+ and to GLSL 1.5. I'm trying to avoid using the deprecated features.
My question how do we now generate the view or projection matrix. I was using the matrix stack to calculate the projection matrix for me;
GLfloat ptr[16];
gluPerspective(...);
glGetFloatv(GL_MODELVIEW_MATRIX, ptr);
//then pass ptr via a uniform to the shader
But obviously the matrix stack is deprecated. So this approach is not the best an option going forward.
I have the 'Red Book', 7th ed, which covers 3.0 & 3.1 and it still uses the deprecated matrix functions in it's examples.
I could write some utility-code myself to generate the matrices. But I don't want to re-invent this particular wheel, especially when this functionality is required for every 3D graphics program.
What is the accepted way to generate world,view & projection matrices for OpenGL? Is there an emerging 'standard' library for this? Or is there some other hidden (to me) functionality in OpenGL/GLSL which I have overlooked?
