DXBC: Added missing chunk. Fixed #536.

src/shader_dxbc.cpp

@@ -1785,13 +1785,15 @@ namespace bgfx
 				size += read(_reader, _dxbc.outputSignature);
 				break;
 
-			case BX_MAKEFOURCC('R', 'D', 'E', 'F'):
-			case BX_MAKEFOURCC('I', 'F', 'C', 'E'):
-			case BX_MAKEFOURCC('P', 'C', 'S', 'G'):
-			case BX_MAKEFOURCC('S', 'T', 'A', 'T'):
-			case BX_MAKEFOURCC('S', 'F', 'I', '0'):
-			case BX_MAKEFOURCC('P', 'S', 'O', '1'):
-			case BX_MAKEFOURCC('P', 'S', 'O', '2'):
+			case BX_MAKEFOURCC('I', 'F', 'C', 'E'): // Interface.
+			case BX_MAKEFOURCC('R', 'D', 'E', 'F'): // Resource definition.
+			case BX_MAKEFOURCC('S', 'D', 'G', 'B'): // Shader debugging info (old).
+			case BX_MAKEFOURCC('S', 'P', 'D', 'B'): // Shader debugging info (new).
+			case BX_MAKEFOURCC('S', 'F', 'I', '0'): // ?
+			case BX_MAKEFOURCC('S', 'T', 'A', 'T'): // Statistics.
+			case BX_MAKEFOURCC('P', 'C', 'S', 'G'): // Patch constant signature.
+			case BX_MAKEFOURCC('P', 'S', 'O', '1'): // Pipeline State Object 1
+			case BX_MAKEFOURCC('P', 'S', 'O', '2'): // Pipeline State Object 2
 				size += chunkSize;
 				break;