Added ability to read GPU stats

CaseLights.xcodeproj/project.pbxproj

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-		E9AB18001C29F8CD00BF3C51 /* Serial.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = Serial.m; sourceTree = "<group>"; };
+		E9109B171C2AAFE100726111 /* GPUStats.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = GPUStats.h; path = CaseLights/GPUStats.h; sourceTree = "<group>"; };
+		E9109B181C2AAFE100726111 /* GPUStats.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = GPUStats.m; path = CaseLights/GPUStats.m; sourceTree = "<group>"; };
+		E9AB17FF1C29F8CD00BF3C51 /* Serial.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Serial.h; path = CaseLights/Serial.h; sourceTree = "<group>"; };
+		E9AB18001C29F8CD00BF3C51 /* Serial.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = Serial.m; path = CaseLights/Serial.m; sourceTree = "<group>"; };
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+			children = (
+				E9AB17FF1C29F8CD00BF3C51 /* Serial.h */,
+				E9AB18001C29F8CD00BF3C51 /* Serial.m */,
+				E9109B171C2AAFE100726111 /* GPUStats.h */,
+				E9109B181C2AAFE100726111 /* GPUStats.m */,
+			);
+			name = LowLevel;
+			path = ..;
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+		};
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 				E9F13E021C28B3D3004C6B95 /* AppDelegate.m */,
 				E9AB18041C2A173500BF3C51 /* Thread.h */,
 				E9AB18051C2A173500BF3C51 /* Thread.m */,
+				E9109B161C2AAFA200726111 /* LowLevel */,
 				E9F13E071C28B3D3004C6B95 /* Assets.xcassets */,
 				E9F13E091C28B3D3004C6B95 /* MainMenu.xib */,
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 			path = CaseLights;
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 			files = (
 				E9AB18011C29F8CD00BF3C51 /* Serial.m in Sources */,
+				E9109B191C2AAFE100726111 /* GPUStats.m in Sources */,
 				E9F13E061C28B3D3004C6B95 /* main.m in Sources */,
 				E9F13E031C28B3D3004C6B95 /* AppDelegate.m in Sources */,
 				E9AB18061C2A173500BF3C51 /* Thread.m in Sources */,

CaseLights/AppDelegate.m

 
 #import "AppDelegate.h"
 #import "Serial.h"
+#import "GPUStats.h"
 
 #define PREF_SERIAL_PORT @"SerialPort"
 #define PREF_LIGHTS_STATE @"LightState"
     
     // TODO Prepare animations menu
     
-    // TODO Prepare visualizations menu
+    // Check if GPU Stats are available, add menu items if so
+    NSNumber *usage;
+    NSNumber *freeVRAM;
+    NSNumber *usedVRAM;
+    if ([GPUStats getGPUUsage:&usage freeVRAM:&freeVRAM usedVRAM:&usedVRAM] != 0) {
+        NSLog(@"Error reading GPU information\n");
+    } else {
+        NSMenuItem *itemUsage = [[NSMenuItem alloc] initWithTitle:@"GPU Usage" action:@selector(selectedGPUVisualization:) keyEquivalent:@""];
+        [menuVisualizations addItem:itemUsage];
+        
+        NSMenuItem *itemVRAM = [[NSMenuItem alloc] initWithTitle:@"VRAM Usage" action:@selector(selectedGPUVisualization:) keyEquivalent:@""];
+        [menuVisualizations addItem:itemVRAM];
+        
+        // TODO Enable item if it was last used
+    }
     
     // Prepare serial port menu
     NSArray *ports = [Serial listSerialPorts];
     
 }
 
+- (void)selectedGPUVisualization:(NSMenuItem *)sender {
+    
+}
+
 - (void)selectedSerialPort:(NSMenuItem *)source {
     // Store selection for next start-up
     NSUserDefaults *store = [NSUserDefaults standardUserDefaults];

CaseLights/GPUStats.h

+//
+//  GPUStats.h
+//  CaseLights
+//
+//  Created by Thomas Buck on 23.12.15.
+//  Copyright © 2015 xythobuz. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface GPUStats : NSObject
+
++ (NSInteger)getGPUUsage:(NSNumber **)usage freeVRAM:(NSNumber **)free usedVRAM:(NSNumber **)used;
+
+@end

CaseLights/GPUStats.m

+//
+//  GPUStats.m
+//  CaseLights
+//
+//  Created by Thomas Buck on 23.12.15.
+//  Copyright © 2015 xythobuz. All rights reserved.
+//
+
+#import <IOKit/IOKitLib.h>
+
+#import "GPUStats.h"
+
+@implementation GPUStats
+
++ (NSInteger)getGPUUsage:(NSNumber **)usage freeVRAM:(NSNumber **)free usedVRAM:(NSNumber **)used {
+    if ((usage == nil) || (free == nil) || (used == nil)) {
+        NSLog(@"Invalid use of getGPUUsage!\n");
+        return 1;
+    }
+    
+    *usage = nil;
+    *free = nil;
+    *used = nil;
+    
+    CFMutableDictionaryRef pciDevices = IOServiceMatching(kIOAcceleratorClassName);
+    io_iterator_t iterator;
+    if (IOServiceGetMatchingServices(kIOMasterPortDefault, pciDevices, &iterator) == kIOReturnSuccess) {
+        io_registry_entry_t registry;
+        while ((registry = IOIteratorNext(iterator))) {
+            CFMutableDictionaryRef services;
+            if (IORegistryEntryCreateCFProperties(registry, &services, kCFAllocatorDefault, kNilOptions) == kIOReturnSuccess) {
+                CFMutableDictionaryRef properties = (CFMutableDictionaryRef)CFDictionaryGetValue(services, CFSTR("PerformanceStatistics"));
+                if (properties) {
+                    const void *gpuUsage = CFDictionaryGetValue(properties, CFSTR("GPU Core Utilization"));
+                    const void *freeVRAM = CFDictionaryGetValue(properties, CFSTR("vramFreeBytes"));
+                    const void *usedVRAM = CFDictionaryGetValue(properties, CFSTR("vramUsedBytes"));
+                    
+                    if (gpuUsage && freeVRAM && usedVRAM) {
+                        // Found the GPU. Store this reference for the next call
+                        static ssize_t gpuUsageNum = 0;
+                        static ssize_t freeVRAMNum = 0;
+                        static ssize_t usedVRAMNum = 0;
+                        CFNumberGetValue((CFNumberRef)gpuUsage, kCFNumberSInt64Type, &gpuUsageNum);
+                        CFNumberGetValue((CFNumberRef)freeVRAM, kCFNumberSInt64Type, &freeVRAMNum);
+                        CFNumberGetValue((CFNumberRef)usedVRAM, kCFNumberSInt64Type, &usedVRAMNum);
+                        *usage = [NSNumber numberWithDouble:gpuUsageNum / (double)10000000];
+                        *free = [NSNumber numberWithDouble:freeVRAMNum];
+                        *used = [NSNumber numberWithDouble:usedVRAMNum];
+                        
+                        //NSLog(@"GPU: %.3f%% VRAM: %.3f%%\n", gpuUsageNum / (double)10000000,
+                              //usedVRAMNum / (double)(freeVRAMNum + usedVRAMNum) * 100.0);
+                    }
+                }
+                CFRelease(services);
+            }
+            IOObjectRelease(registry);
+        }
+        IOObjectRelease(iterator);
+    } else {
+        NSLog(@"Couldn't list PCI devices!\n");
+    }
+    
+    if ((*usage != nil) && (*free != nil) && (*used != nil)) {
+        return 0;
+    } else {
+        NSLog(@"Error reading GPU data!\n");
+        return 1;
+    }
+}
+
+@end

CaseLights/Info.plist

 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>34</string>
+	<string>43</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
 	<key>LSMinimumSystemVersion</key>

CaseLights/Serial.m

 //  Copyright © 2015 xythobuz. All rights reserved.
 //
 
+#import <Cocoa/Cocoa.h>
+#import <IOKit/IOKitLib.h>
 #import <IOKit/serial/IOSerialKeys.h>
 
 #import "Serial.h"