Rendertarget attachments, texture and image changes (#358)

* Add multiple color outputs for fragment shaders

* Add registers and gal enums

* Use textures for framebuffers and split color and zeta framebuffers

* Abstract texture and framebuffer targets as an image

* Share images between framebuffers and textures

* Unstub formats

* Add some formats

* Disable multiple attachments

* Cache framebuffer attachments

* Handle format types

* Add some rendertarget formats

* Code cleanup

* Fixup half float types

* Address feedback

* Disable multiple attachments in shaders

* Add A4B4G4R4 image format

* Add reversed section for image enums

2 files changed, 13 insertions, 5 deletions

diff --git a/Ryujinx.Graphics/Gal/Shader/GlslDecl.cs b/Ryujinx.Graphics/Gal/Shader/GlslDecl.cs
index ccc59e04..56745bc1 100644
--- a/Ryujinx.Graphics/Gal/Shader/GlslDecl.cs
+++ b/Ryujinx.Graphics/Gal/Shader/GlslDecl.cs
@@ -16,6 +16,7 @@ namespace Ryujinx.Graphics.Gal.Shader
         public const int VertexIdAttr    = 0x2fc;
         public const int FaceAttr        = 0x3fc;
 
+        public const int MaxFrameBufferAttachments = 8;
         public const int MaxUboSize = 1024;
 
         public const int GlPositionVec4Index = 7;
@@ -99,7 +100,11 @@ namespace Ryujinx.Graphics.Gal.Shader
 
             if (ShaderType == GalShaderType.Fragment)
             {
-                m_Gprs.Add(0, new ShaderDeclInfo(FragmentOutputName, 0, false, 0, 4));
+                //Note: Replace 1 with MaxFrameBufferAttachments when attachments start to work
+                for (int Index = 0; Index < 1; Index++)
+                {
+                    m_Gprs.Add(Index * 4, new ShaderDeclInfo(FragmentOutputName + Index, Index * 4, false, 0, 4));
+                }
             }
 
             foreach (ShaderIrBlock Block in Blocks)
diff --git a/Ryujinx.Graphics/Gal/Shader/GlslDecompiler.cs b/Ryujinx.Graphics/Gal/Shader/GlslDecompiler.cs
index 7f1cfabc..72637984 100644
--- a/Ryujinx.Graphics/Gal/Shader/GlslDecompiler.cs
+++ b/Ryujinx.Graphics/Gal/Shader/GlslDecompiler.cs
@@ -352,9 +352,9 @@ namespace Ryujinx.Graphics.Gal.Shader
                 {
                     Name = CustomType + " " + DeclInfo.Name + Suffix + ";";
                 }
-                else if (DeclInfo.Name == GlslDecl.FragmentOutputName)
+                else if (DeclInfo.Name.Contains(GlslDecl.FragmentOutputName))
                 {
-                    Name = "layout (location = 0) out vec4 " + DeclInfo.Name + Suffix + ";" + Environment.NewLine;
+                    Name = "layout (location = " + DeclInfo.Index / 4 + ") out vec4 " + DeclInfo.Name + Suffix + ";";
                 }
                 else
                 {
@@ -829,8 +829,11 @@ namespace Ryujinx.Graphics.Gal.Shader
                 {
                     return "gl_PointSize";
                 }
+            }
 
-                throw new InvalidOperationException();
+            if (DeclInfo.Index >= 16)
+            {
+                throw new InvalidOperationException($"Shader attribute offset {Abuf.Offs} is invalid.");
             }
 
             if (Decl.ShaderType == GalShaderType.Geometry)
@@ -876,7 +879,7 @@ namespace Ryujinx.Graphics.Gal.Shader
 
         private string GetNameWithSwizzle(IReadOnlyDictionary<int, ShaderDeclInfo> Dict, int Index)
         {
-            int VecIndex = Index >> 2;
+            int VecIndex = Index & ~3;
 
             if (Dict.TryGetValue(VecIndex, out ShaderDeclInfo DeclInfo))
             {