Meta: Add gn build rules for LibGL and its dependencies

Meta/gn/secondary/Meta/Lagom/Tools/CodeGenerators/LibGL/BUILD.gn

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+import("//Meta/Lagom/Tools/lagom_tool.gni")
+
+lagom_tool("GenerateGLAPIWrapper") {
+  sources = [ "GenerateGLAPIWrapper.cpp" ]
+  deps = [ "//Userland/Libraries/LibMain" ]
+}

Meta/gn/secondary/Userland/Libraries/LibGL/BUILD.gn

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+import("//Meta/gn/build/compiled_action.gni")
+
+compiled_action("generate_glapi") {
+  tool = "//Meta/Lagom/Tools/CodeGenerators/LibGL:GenerateGLAPIWrapper"
+  inputs = [ "GLAPI.json" ]
+  outputs = [
+    "$target_gen_dir/GL/glapi.h",
+    "$target_gen_dir/GLAPI.cpp",
+  ]
+  args = [
+    "-h",
+    rebase_path(outputs[0], root_build_dir),
+    "-c",
+    rebase_path(outputs[1], root_build_dir),
+    "-j",
+    rebase_path(inputs[0], root_build_dir),
+  ]
+
+  # FIXME: install header into $prefix/include/LibGL/GL on serenity
+}
+
+config("gl_headers") {
+  include_dirs = [ "$target_gen_dir/.." ]
+}
+
+shared_library("LibGL") {
+  output_name = "gl"
+  include_dirs = [ "//Userland/Libraries" ]
+  public_configs = [ ":gl_headers" ]
+  sources = [
+    "Buffer.cpp",
+    "Buffer/Buffer.cpp",
+    "ClipPlane.cpp",
+    "ContextParameter.cpp",
+    "GLContext.cpp",
+    "Image.cpp",
+    "Lighting.cpp",
+    "List.cpp",
+    "Matrix.cpp",
+    "NameAllocator.cpp",
+    "Shader.cpp",
+    "Shaders/Program.cpp",
+    "Shaders/Shader.cpp",
+    "Stencil.cpp",
+    "Tex/Texture2D.cpp",
+    "Texture.cpp",
+    "Vertex.cpp",
+  ]
+  sources += get_target_outputs(":generate_glapi")
+  deps = [
+    ":generate_glapi",
+    "//AK",
+    "//Userland/Libraries/LibCore",
+    "//Userland/Libraries/LibGLSL",
+    "//Userland/Libraries/LibGPU",
+    "//Userland/Libraries/LibGfx",
+  ]
+}

Meta/gn/secondary/Userland/Libraries/LibGLSL/BUILD.gn

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+shared_library("LibGLSL") {
+  output_name = "glsl"
+  include_dirs = [ "//Userland/Libraries" ]
+  sources = [
+    "Compiler.cpp",
+    "Linker.cpp",
+  ]
+  deps = [
+    "//AK",
+    "//Userland/Libraries/LibCore",
+    "//Userland/Libraries/LibGPU",
+  ]
+}

Meta/gn/secondary/Userland/Libraries/LibGPU/BUILD.gn

@@ -0,0 +1,21 @@
+shared_library("LibGPU") {
+  output_name = "gpu"
+  include_dirs = [ "//Userland/Libraries" ]
+  sources = [
+    "Driver.cpp",
+    "Image.cpp",
+  ]
+  deps = [
+    "//AK",
+    "//Userland/Libraries/LibCore",
+  ]
+
+  # FIXME: express this dependency properly to avoid cycles
+  #    we want to make sure that LibSoftGPU is built when LibGPU is needed
+  #data_deps = [ "//Userland/Libraries/LibSoftGPU" ]
+  if (current_os == "serenity") {
+    #data_deps += [ "//Userland/Libraries/LibVirtGPU" ]
+  } else if (current_os == "linux") {
+    libs = [ "dl" ]
+  }
+}

Meta/gn/secondary/Userland/Libraries/LibGfx/BUILD.gn

@@ -0,0 +1,84 @@
+shared_library("LibGfx") {
+  output_name = "gfx"
+  include_dirs = [
+    "//Userland/Libraries",
+    "//Userland",
+  ]
+  sources = [
+    "AffineTransform.cpp",
+    "AntiAliasingPainter.cpp",
+    "Bitmap.cpp",
+    "BitmapMixer.cpp",
+    "ClassicStylePainter.cpp",
+    "ClassicWindowTheme.cpp",
+    "Color.cpp",
+    "CursorParams.cpp",
+    "EdgeFlagPathRasterizer.cpp",
+    "Filters/ColorBlindnessFilter.cpp",
+    "Filters/FastBoxBlurFilter.cpp",
+    "Filters/LumaFilter.cpp",
+    "Filters/StackBlurFilter.cpp",
+    "Font/BitmapFont.cpp",
+    "Font/Emoji.cpp",
+    "Font/Font.cpp",
+    "Font/FontDatabase.cpp",
+    "Font/OpenType/Cmap.cpp",
+    "Font/OpenType/Font.cpp",
+    "Font/OpenType/Glyf.cpp",
+    "Font/OpenType/Hinting/Opcodes.cpp",
+    "Font/PathRasterizer.cpp",
+    "Font/ScaledFont.cpp",
+    "Font/Typeface.cpp",
+    "Font/WOFF/Font.cpp",
+    "GradientPainting.cpp",
+    "ICC/BinaryWriter.cpp",
+    "ICC/Profile.cpp",
+    "ICC/TagTypes.cpp",
+    "ICC/Tags.cpp",
+    "ICC/WellKnownProfiles.cpp",
+    "ImageFormats/BMPLoader.cpp",
+    "ImageFormats/BMPWriter.cpp",
+    "ImageFormats/BooleanDecoder.cpp",
+    "ImageFormats/DDSLoader.cpp",
+    "ImageFormats/GIFLoader.cpp",
+    "ImageFormats/ICOLoader.cpp",
+    "ImageFormats/ImageDecoder.cpp",
+    "ImageFormats/JPEGLoader.cpp",
+    "ImageFormats/PBMLoader.cpp",
+    "ImageFormats/PGMLoader.cpp",
+    "ImageFormats/PNGLoader.cpp",
+    "ImageFormats/PNGWriter.cpp",
+    "ImageFormats/PPMLoader.cpp",
+    "ImageFormats/PortableFormatWriter.cpp",
+    "ImageFormats/QOILoader.cpp",
+    "ImageFormats/QOIWriter.cpp",
+    "ImageFormats/TGALoader.cpp",
+    "ImageFormats/TinyVGLoader.cpp",
+    "ImageFormats/WebPLoader.cpp",
+    "ImageFormats/WebPLoaderLossless.cpp",
+    "ImageFormats/WebPLoaderLossy.cpp",
+    "Painter.cpp",
+    "Palette.cpp",
+    "Path.cpp",
+    "Point.cpp",
+    "Rect.cpp",
+    "ShareableBitmap.cpp",
+    "Size.cpp",
+    "StylePainter.cpp",
+    "SystemTheme.cpp",
+    "TextDirection.cpp",
+    "TextLayout.cpp",
+    "Triangle.cpp",
+    "WindowTheme.cpp",
+  ]
+  deps = [
+    "//AK",
+    "//Userland/Libraries/LibCompress",
+    "//Userland/Libraries/LibCore",
+    "//Userland/Libraries/LibCrypto",
+    "//Userland/Libraries/LibFileSystem",
+    "//Userland/Libraries/LibIPC",
+    "//Userland/Libraries/LibTextCodec",
+    "//Userland/Libraries/LibUnicode",
+  ]
+}

Meta/gn/secondary/Userland/Libraries/LibSoftGPU/BUILD.gn

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+shared_library("LibSoftGPU") {
+  output_name = "softgpu"
+  include_dirs = [ "//Userland/Libraries" ]
+  cflags_cc = [ "-Wno-psabi" ]
+  sources = [
+    "Clipper.cpp",
+    "Device.cpp",
+    "Image.cpp",
+    "PixelConverter.cpp",
+    "Sampler.cpp",
+    "Shader.cpp",
+    "ShaderCompiler.cpp",
+    "ShaderProcessor.cpp",
+  ]
+  deps = [
+    "//AK",
+    "//Userland/Libraries/LibCore",
+    "//Userland/Libraries/LibGPU",
+    "//Userland/Libraries/LibGfx",
+  ]
+}