Render manager about openage HOT 7 CLOSED

I have started working on this here: https://github.com/jamesmintram/openage/tree/graphics_renderer

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dis is free software: https://github.com/google/ion, README transcription follows:

Ion is a portable suite of libraries and tools for building client applications,
especially graphical ones. It is small, fast, and robust, and is cross-platform
across many platforms and devices, including desktops, mobile devices, browsers,
and other embedded platforms.
Why Use Ion?

• Small: < 500k binary size on mobile platforms, often much smaller
• Powerful: Tools for faster productivity when developing applications
  • Robust, portable application infrastructure aids in:
  • Object lifetime management
  • Memory allocation
  • Application start-up and static instances
  • Threading
  • Run-time setting editing
  • Automatic performance instrumentation
  • More!
• Tools for graphics:
  • Analyze graphics scenes to find performance bottleneck
  • Trace all OpenGL calls and examine their arguments
  • Use scene resources in multiple contexts, automatically
  • Run-time graphics state introspection
  • Run-time shader editing: change your shaders and immediately see the results
• Fast graphics: Minimal overhead between your application and OpenGL / ES
• Tested: Well-tested and facilitates testing your application
  • ~100% test coverage
  • Black- and white-box tested, unit tests and integration tests
  • Mock implementation of OpenGL API allows direct renderer unit tests and
    validation
  • Integrated Remote: extensible API allows changing arbitrary application
    settings on-the-fly for faster development, testing, and debugging
• Cross-platform:
  • Desktop: Linux, Mac OSX, Windows (OpenGL)
  • Handheld: Android (ARM, x86 MIPS), iOS (ARM and x86), and their 64-bit
    variants
  • Browser: Emscripten/asm.js, NaCl / pNaCl
• Cross-functional
  • Used by many teams across Google, running on billions of devices through
    multiple Google products

NOTE: This is not an official Google product.

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https://github.com/google/ion/tree/master/third_party hrrg

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My attempt (will continue someday) is #287, but I'm currently working on nyan.
You can continue my branch and submit pulls there if anyone likes.

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See #850

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Here is a list of things to be done for the new renderer implementation:

• Abstraction of render backend
  • OpenGL 3.3 or higher
    • Use 4.x when available (optional)
    • Support ancient 2.x legacy (optional)
  • Vulkan (optional, #242)
• Render pipeline abstraction
  • Textures
  • Shaders
    • Uniforms
    • Uniform buffers
    • Vertex attributes
  • Geometries
    • Quad primitives
    • Circles
    • Smooth paths
    • Mesh importing (optional)
  • Render targets
    • Framebuffers
    • Renderbuffers (optional)
• Functionality
  • Screenshot support
    • PBO optimization for texture downloading (optional)
  • Pixel-perfect unit hitbox for unit selection and damage areas (#368, #671 )
  • Outline rendering
  • Investigate why tree textures render incorrectly (#359, maybe this?)
  • Fix #374
• Terrain rendering
  • Merge terrain texture into a single bitmap
  • Cache blending results (#154, #158)
  • Do as much as possible in shaders (#149)
  • Clip tiles properly (#141)
• Optimizations
  • Occlusion queries
  • Minimize OpenGL state changes (batch by shader, then by buffer)
  • Texture binpacking into atlas
  • Smooth zooming
• Integration
  • Rewrite all of drawing functionality to be expressed in terms of Renderer
    • Get rid of GL code everywhere except the rendering backend and the GUI
    • Write a GameRenderer that takes evaluations of curves at the current instant as input
  • GUI integration
    • TBD (#624)

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we have added various components of a render manager meanwhile :)

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