RubyGL

Ruby + OpenGL

Transcript

1. RubyGL Ruby + OpenGL
2. What is OpenGL?
3. Talks to your Graphics Processor
4. Universal API for all hardware
5. Compare with Web Dev Graphics Processor OpenGL ? ? Network Card HTTP Rack Rails
6. Why OpenGL?
7. Cross Platform
8. Runs on anything with a Graphics Processor
9. No license required
10. Used by millions
11. Why OpenGL + Ruby?
12. OpenGL is a C library
13. C isn’t fun :(
14. Ruby is fun :)
15. How OpenGL + Ruby?
16. $ gem install opengl-bindings
17. Call OpenGL functions from Ruby
18. Problem?
19. We inherit all the problems we had writing OpenGL in C
20. Function order issues
21. Have to remember to bind objects before you use them glBindBuffer(some_buffer) glBufferData(some_data_to_put_in_the_buffer) # ... glBindBuffer(some_buffer) glDrawElements(...)
22. Whack naming conventions
23. “Mesh” or “3D Object” == “Vertex Array Object (VAO)”
24. Pointers… :(
25. buffer = ' '*8 glGenBuffers(1, buffer) buffer = buffer.unpack('L')[0]
26. glBindBuffer(some_buffer) array = [1,2,3,4,...] ptr = Fiddle.Pointer.new( array.pack('L' * array.length * BYTES_PER_INT) ) glBufferData(ptr, 0, array.length * BYTES_PER_INT)
27. No real exception handling
28. glSomething(...) raise “error!” unless glGetError.zero? glSomething(...) raise “error!” unless glGetError.zero? glSomething(...) raise “error!” unless glGetError.zero? glSomething(...) raise “error!” unless glGetError.zero? # etc ...
29. “impossible” debugging
30. Something went wrong ¯\_(ツ)_/¯
31. Something went horribly wrong ¯\_(ツ)_/¯
32. OpenGL in Ruby is just as hard as C
33. :(
34. Has anyone solved this?
35. Ruby Graphics Libraries ◦ Rubygame: 2D only, latest commit in 2011 ◦ jemini: 2D only, latest commit in 2013 ◦ ray: limited 3D support, latest commit in 2013 ◦ shoes: GUI, 2D only, JRuby only ◦ gosu: 2D only ◦ ruby-opengl: bindings only ◦ ...
36. So… not really.
37. Solution!
38. Let’s solve this!
39. Let’s fix function order issues
40. Extract method! def draw(buffer) glBindBuffer(buffer) glDrawElements(...) end
41. Let’s fix whack naming conventions
42. Abstract OpenGL as a “proper” OOP library class Mesh def initialize @buffer = glCreateBuffer() end def draw glBindBuffer(@buffer) glDrawElements(...) end end
43. Let’s fix Pointers… :(
44. def create_buffer buffer = ' '*8 glGenBuffers(1, buffer) buffer.unpack('L')[0] end
45. def bind_buffer_data(buffer, data) glBindBuffer(some_buffer) ptr = FFI.Pointer.new( array.pack('L' * data.length * BYTES_PER_INT) ) glBufferData(ptr, 0, data.length * BYTES_PER_INT) end
46. Let’s fix no real exception handling
47. module OpenGLDebug def method_missing(sym) retval = OpenGL.send(sym, args) # do thing puts sym, args, retval # debug error = glGetError raise error unless error.zero? # check error retval end end
48. Let’s fix “impossible” debugging
49. ¯\_(ツ)_/¯
50. Mittsu
51. Mittsu (it’s a Japanese word for the number Three)
52. The “Rack” of Graphics Programming
53. Compare with Web Dev Graphics Processor OpenGL Mittsu ? Network Card HTTP Rack Rails
54. Based off THREE.js (So it inherits pretty much the same API structure)
55. Still a bit rough around the edges (It inherited most of the crappy code structure, too)
56. Demo!
57. The Future
58. Performance
59. If Mittsu is the “Rack”, What is the “Rails”?
60. Support all the environments!
61. One API to rule them all!
62. Imagine: OSX/iOS + Metal + Rubymotion Android + OpenGL ES + Rubymotion JVM + LWJGL/JOGL + JRuby Windows + DirectX? Vulkan? (next-gen OpenGL)
63. Contribute! https://github.com/jellymann/mittsu https://rubygems.org/gems/mittsu I need help with: • Testing! • Refactoring! • Find Bugs! • Write documentation e.g. Getting Started Guide
64. One more thing...
65. THAAAAANKS!!!
66. Tweet: @jellym4nn Collaborate: github.com/jellymann Contact: dan@platform45.com