define __GL__ (#2546)

* define __GL__

* update docs

Author: nkast

Documentation/articles/content/custom_effects.md

@@ -65,8 +65,10 @@ These are some tips for writing or converting effects for use with KNI.
 |  * `__KNIFX__`                   |
 |  * `__DEBUG__` when building with the Debug flag |
 |  * `__DIRECTX__` when targeting DirectX |
-|  * `__OPENGL__` when targeting OpenGL |
-|  * `__MOJOSHADER__` when building with MojoShader, targeting OpenGL |
+|  * `__GL__` when targeting OpenGL/GLES/WebGL |
+|  * `__OPENGL__` when targeting desktop OpenGL |
+|  * `__GLES__` when targeting GLES/WebGL |
+|  * `__MOJOSHADER__` when building with MojoShader, targeting OpenGL/GLES/WebGL |
 |---|
 
 

src/Xna.Framework.Content.Pipeline.Graphics.MojoProcessor/EffectCompiler/ShaderProfile.cs

@@ -44,7 +44,7 @@ protected ShaderProfile()
         /// </summary>
         public abstract ShaderProfileType ProfileType { get; }
 
-        internal abstract IEnumerable<KeyValuePair<string,string>> GetMacros();
+        internal abstract IEnumerable<KeyValuePair<string,string>> GetMacros(GraphicsBackend backend);
 
         internal abstract void ValidateShaderModels(PassInfo pass, string shaderFunction, string shaderModel, ShaderStage shaderStage, ShaderVersion shaderVersion);
 

src/Xna.Framework.Content.Pipeline.Graphics.MojoProcessor/EffectCompiler/ShaderProfileDX11.cs

@@ -25,7 +25,7 @@ public ShaderProfileDX11()
         {
         }
 
-        internal override IEnumerable<KeyValuePair<string, string>> GetMacros()
+        internal override IEnumerable<KeyValuePair<string, string>> GetMacros(GraphicsBackend backend)
         {
             yield return new KeyValuePair<string, string>("__DIRECTX__", "1");
         }

src/Xna.Framework.Content.Pipeline.Graphics.MojoProcessor/EffectCompiler/ShaderProfileGL.cs

@@ -28,10 +28,22 @@ public ShaderProfileGL()
         {
         }
 
-        internal override IEnumerable<KeyValuePair<string, string>> GetMacros()
+        internal override IEnumerable<KeyValuePair<string, string>> GetMacros(GraphicsBackend backend)
         {
-            yield return new KeyValuePair<string, string>("__OPENGL__", "1");
+            yield return new KeyValuePair<string, string>("__GL__", "1");
             yield return new KeyValuePair<string, string>("__MOJOSHADER__", "1");
+
+            switch(backend)
+            {
+                case GraphicsBackend.OpenGL:
+                        yield return new KeyValuePair<string, string>("__OPENGL__", "1");
+                    break;
+
+                    case GraphicsBackend.GLES:
+                    case GraphicsBackend.WebGL:
+                        yield return new KeyValuePair<string, string>("__GLES__", "1");
+                    break;
+            }
         }
 
         internal override void ValidateShaderModels(PassInfo pass, string shaderFunction, string shaderModel, ShaderStage shaderStage, ShaderVersion shaderVersion)

src/Xna.Framework.Content.Pipeline.Graphics.MojoProcessor/Processors/MojoEffectProcessor.cs

@@ -98,7 +98,7 @@ public override CompiledEffectContent Process(EffectContent input, ContentProces
                     string fullFilePath = Path.GetFullPath(input.Identity.SourceFilename);
 
                     // Preprocess the FX file expanding includes and macros.
-                    string effectCode = Preprocess(input, context, shaderProfile, fullFilePath);
+                    string effectCode = Preprocess(input, context, backend, shaderProfile, fullFilePath);
 
                     EffectObject effectObject = ProcessTechniques(input, context, backend, shaderProfile, fullFilePath, effectCode);
 
@@ -242,7 +242,7 @@ public static ShaderProfile ShaderProfileFromBackend(GraphicsBackend backend)
 
         // Pre-process the file,
         // resolving all #includes and macros.
-        private string Preprocess(EffectContent input, ContentProcessorContext context, ShaderProfile shaderProfile, string fullFilePath)
+        private string Preprocess(EffectContent input, ContentProcessorContext context, GraphicsBackend backend, ShaderProfile shaderProfile, string fullFilePath)
         {
             Preprocessor pp = new Preprocessor(input, context, fullFilePath);
 
@@ -252,7 +252,7 @@ private string Preprocess(EffectContent input, ContentProcessorContext context,
             if (DebugMode == EffectProcessorDebugMode.Debug)
                 pp.AddMacro("__DEBUG__", "1");
 
-            foreach (KeyValuePair<string, string> macro in shaderProfile.GetMacros())
+            foreach (KeyValuePair<string, string> macro in shaderProfile.GetMacros(backend))
                 pp.AddMacro(macro.Key, macro.Value);
 
             if (!string.IsNullOrEmpty(Defines))