Design.MultipleShaderPrograms - lidavidm/jsglet GitHub Wiki

Uses

• Render some objects as particles, other textured, etc.

Needs and Considerations

• Switching programs is an expensive operation - try to draw all objects from a particular program at once

• Much code is tightly coupled to the program

  • They need metadata from the shaders, such as attribute locations

    • In this case: establish a consistent scheme for attribute location numbering

        vertex = 0
        color = 1
        texture = 2
        normal = 3
        etc.
      

Implementation

• CompositeProgram

  • Manages a collection of Programs
  • Provides consistent access to needed metadata
  • Should eliminate need to manipulate OpenGL program object directly

• MultiBufferObjects live in a certain ProgramDomain which contains the program-specific info (perhaps just make this part of the Program object)

  • Can switch domains/programs if needed