Untangle internal & implementation format.

Textures and renderbuffers were storing both the OpenGL internalformat
and the SwiftShader implementation format (i.e. sw::Format). This
change removes the implementation format, only keeping it in the Image
class.

Change-Id: Ie6ac96f6450b9a55ea9b49c6cf4b2c0681e95522
Reviewed-on: https://swiftshader-review.googlesource.com/14528
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/OpenGL/libGLESv2/libGLESv2.cpp

diff --git a/src/OpenGL/libGLESv2/libGLESv2.cpp b/src/OpenGL/libGLESv2/libGLESv2.cpp
index 08abb33..8f8ccdf 100644
--- a/src/OpenGL/libGLESv2/libGLESv2.cpp
+++ b/src/OpenGL/libGLESv2/libGLESv2.cpp
@@ -2285,7 +2285,7 @@
 			return error(GL_INVALID_OPERATION);
 		}
 
-		if(!IsMipmappable(texture->getFormat(target, 0), texture->getInternalFormat(target, 0), clientVersion))
+		if(!IsMipmappable(texture->getFormat(target, 0), clientVersion))
 		{
 			return error(GL_INVALID_OPERATION);
 		}
@@ -3019,7 +3019,7 @@
 					return error(GL_INVALID_OPERATION);
 				}
 
-				*params = sw2es::GetComponentType(renderbuffer->getInternalFormat(), attachment);
+				*params = GetComponentType(renderbuffer->getFormat(), attachment);
 				break;
 			case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING:
 				if(clientVersion >= 3)
@@ -6319,7 +6319,7 @@
 		return error(GL_INVALID_ENUM);
 	}
 
-	if(internalformat != (GLint)format)
+	if(internalformat != format)
 	{
 		return error(GL_INVALID_OPERATION);
 	}