Create InterfaceBlock Class

[Zomon333]

We'll need to use interface blocks extensively in our OpenGL implementation. We should have a class to abstract the usage of them. This class will likely be a parent class of various other Blocks like UniformBlocks.

We may have a desire to store individual Shader Variables in the InterfaceBlock class as member variables using a template. Discuss.

More details will follow upon completion of Chapter 2 notes.

[Zomon333]

Completion of Chapter 2 Notes:

• [ ] We may benefit from allowing the use of glUniformBlockBinding to avoid shaders having different IDs for the same uniform block.
• [ ] UniformBlocks:
  • [ ] Get the block index: glGetUniformBlockIndex(GLuint program, const char* uniformBlockName);
  • [ ] Bind a buffer to our block; glBindBuffer(GL_UNIFORM_BUFFER);
  • [ ] Find the size of our buffer to accommodate variables; glGetActiveUniformBlockiv(GL_UNIFORM_DATA_SIZE);
  • [ ] Call glBindBufferBase(GLenum target, GLuint index, GLuint buffer); to bind part of the buffer to the object.
  • [ ] Find the indices of data in block; glGetUniformIndices()

More data may follow. BufferBlocks also exist but looks like they'll benefit from being a child of the InterfaceBlock class. We may also just rename this to UniformBlock because I don't see any other blocks other than Buffer that require a C++ implementation.