[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Initial port of the B3DAccelerator plugin, plus extra Metal and rendering clean up (#382)

[Ronie Salgado]

This is the branch with the port of the B3DAccelerator plugin to Metal. Most the examples in Balloon3D are working with this new plugin, after forcing it by modifying:

B3DSceneMorph >> accelerationEnabled
	"Return true if hardware acceleration is enabled"
	"self accelerationSuspended ifTrue:[^false].
	^self valueOfProperty: #accelerationEnabled ifAbsent:[false]"
	^ true

Shaders are now compiled in runtime, from source code which is embedded in a C-string.

In addition to these changes, in the last commit I did some refactoring of the Metal VM code. I am copying the message of that commit:

- I introduced a hack to select the type of rendering view in runtime.
- I am compiling by again the old core graphics based renderer, but this is only used when the -core-graphics option is passed in the command line.
- I added dummy headless view, that does not render and stubs most of the event.
- I added the -metal, -opengl, and -core-graphics command line options for selecting the rendering backend.
- I am testing the Metal implementation by compiling the shader library. If the shader library compilation fails, then Metal will not be used, and instead OpenGL will be used as a fallback, by default.
You can view, comment on, or merge this pull request online at:

  https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/382

-- Commit Summary --

  * I am starting to reimplement the B3DAcceleratorPlugin using Metal. So far I managed to get a black screen by using the extra layers mechanism,
  * Creating the depth-stencil buffer, and clearing the screen.
  * I am starting to render a bit.
  * I am starting to implement the lighting model in the metal based B3DAcceleratorPlugin.
  * Add a -1 offset to the B3D indices going to Metal.
  * Merge branch 'Cog' into feature/metal_b3d
  * I implemented the Squeak3D lighting model above metal.
  * Merge branch 'Cog' into feature/metal_b3d
  * Merge branch 'Cog' into feature/metal_b3d
  * I introduced a hack to select the type of rendering view in runtime.

-- File Changes --

    M .clang_complete (3)
    M build.macos32x86/common/Makefile.app (4)
    M build.macos32x86/common/Makefile.flags (2)
    M build.macos64x64/common/Makefile.flags (2)
    M build.macos64x64/common/Makefile.vm (2)
    M platforms/Cross/plugins/B3DAcceleratorPlugin/B3DAcceleratorPlugin.h (90)
    A platforms/iOS/plugins/B3DAcceleratorPlugin/B3DMetalShaders.metal (230)
    M platforms/iOS/plugins/B3DAcceleratorPlugin/Makefile (12)
    M platforms/iOS/plugins/B3DAcceleratorPlugin/sqMacOpenGL.m (5)
    A platforms/iOS/plugins/B3DAcceleratorPlugin/sqMetalRenderer.h (131)
    A platforms/iOS/plugins/B3DAcceleratorPlugin/sqMetalRenderer.m (1179)
    A platforms/iOS/plugins/B3DAcceleratorPlugin/sqMetalStructures.h (121)
    M platforms/iOS/vm/Common/main.m (22)
    M platforms/iOS/vm/English.lproj/MainMenu.xib (6)
    M platforms/iOS/vm/OSX/SqViewBitmapConversion.m (263)
    A platforms/iOS/vm/OSX/SqViewBitmapConversion.m.inc (271)
    M platforms/iOS/vm/OSX/SqViewClut.m (115)
    A platforms/iOS/vm/OSX/SqViewClut.m.inc (91)
    M platforms/iOS/vm/OSX/SqueakMainShaders.metal (32)
    D platforms/iOS/vm/OSX/SqueakMainShaders.metal.inc (822)
    M platforms/iOS/vm/OSX/SqueakOSXAppDelegate.m (12)
    M platforms/iOS/vm/OSX/sqSqueakOSXApplication.m (34)
    M platforms/iOS/vm/OSX/sqSqueakOSXCGView.h (4)
    A platforms/iOS/vm/OSX/sqSqueakOSXHeadlessView.h (69)
    A platforms/iOS/vm/OSX/sqSqueakOSXHeadlessView.m (350)
    M platforms/iOS/vm/OSX/sqSqueakOSXMetalView.h (9)
    M platforms/iOS/vm/OSX/sqSqueakOSXMetalView.m (206)
    M platforms/iOS/vm/OSX/sqSqueakOSXOpenGLView.h (2)
    M platforms/iOS/vm/OSX/sqSqueakOSXOpenGLView.m (4)
    A platforms/iOS/vm/OSX/sqSqueakOSXViewFactory.h (22)
    A platforms/iOS/vm/OSX/sqSqueakOSXViewFactory.m (72)
    D scripts/build-metal-shaders.sh (29)

-- Patch Links --

https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/382.patch
https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/382.diff

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