kramv - update fast load path from staging MTLBuffer to MTLTexture, f…

…ix archive increment

This decompresses, aliases, or copies directly from blocks and compressed blocks.
The blit encoder is used to go direct to private textures via a 128MB staging MTLBuffer.
This allows the entire level to be copied at once, and the the blits reference offsets into the buffer.
The buffer is just a linear allocator right now, no circular usage.
Use completion handler.  Loader really needs a queue of pending textures, and also avoid level allocation on the copy path, and use a part of staging texture.
Fix isInfoOnly handling since levelSize was divided by length twice.

kramv/KramLoader.h

@@ -10,10 +10,11 @@
 #import <Foundation/Foundation.h>
 
 // protocol requires imports
-#import <Metal/MTLPixelFormat.h>
-#import <Metal/MTLTexture.h>
 #import <Metal/MTLBlitCommandEncoder.h>
+#import <Metal/MTLCommandBuffer.h>
 #import <Metal/MTLDevice.h>
+#import <Metal/MTLPixelFormat.h>
+#import <Metal/MTLTexture.h>
 
 #endif
 
@@ -31,18 +32,8 @@
 // from url (mmap)
 - (nullable id<MTLTexture>)loadTextureFromURL:(nonnull NSURL *)url originalFormat:(nullable MTLPixelFormat*)originalFormat;
 
-@property (retain, nonatomic, readwrite, nonnull) id<MTLDevice> device;
-
-// test this after load, and use a MTLBlitEncoder to autogen mips
-@property (nonatomic, readwrite, getter=isMipgenNeeded) BOOL mipgenNeeded;
-
-@end
-
-//-------------------------------------
-
-// This loads KTX and PNG data synchronously.  Will likely move to only loading KTX files, with a png -> ktx conversion.
-// The underlying KTXImage is not yet returned to the caller, but would be useful for prop queries.
-@interface KramBlitLoader : NSObject
+// handle auto-mipgen and upload mips from staging MTLBuffer to mips of various private MTLTexture
+- (void)uploadTexturesIfNeeded:(nonnull id<MTLBlitCommandEncoder>)blitEncoder commandBuffer:(nonnull id<MTLCommandBuffer>)commandBuffer;
 
 @property (retain, nonatomic, readwrite, nonnull) id<MTLDevice> device;