Introduced a new Metal renderer implementation and a new example illustrating usage of Metal on macOS and iOS (partially addresses #1873)
Warren Moore
ago%!(EXTRA string=7 years)
parent
deb7aa29cd
commit
d64157e803
18 changed files with 1678 additions and 2 deletions
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# iOS / OSX Metal example |
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## Introduction |
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This example shows how to render ImGui with Metal. It is based on the cross-platform game template provided with Xcode as of Xcode 9. |
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#import <TargetConditionals.h> |
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#if TARGET_OS_IPHONE |
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#import <UIKit/UIKit.h> |
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@interface AppDelegate : UIResponder <UIApplicationDelegate> |
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@property (strong, nonatomic) UIWindow *window; |
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@end |
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#else |
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#import <Cocoa/Cocoa.h> |
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@interface AppDelegate : NSObject <NSApplicationDelegate> |
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@end |
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#endif |
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#import "AppDelegate.h" |
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@implementation AppDelegate |
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#if TARGET_OS_OSX |
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- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender { |
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return YES; |
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} |
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#endif |
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@end |
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#import <MetalKit/MetalKit.h> |
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@interface Renderer : NSObject <MTKViewDelegate> |
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-(nonnull instancetype)initWithView:(nonnull MTKView *)view; |
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@end |
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#import "Renderer.h" |
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#import <Metal/Metal.h> |
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#include "imgui.h" |
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#include "imgui_impl_metal.h" |
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#if TARGET_OS_OSX |
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#include "imgui_impl_osx.h" |
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#endif |
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@interface Renderer () |
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@property (nonatomic, strong) id <MTLDevice> device; |
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@property (nonatomic, strong) id <MTLCommandQueue> commandQueue; |
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@end |
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@implementation Renderer |
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-(nonnull instancetype)initWithView:(nonnull MTKView *)view; |
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{ |
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self = [super init]; |
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if(self) |
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{ |
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_device = view.device; |
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_commandQueue = [_device newCommandQueue]; |
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IMGUI_CHECKVERSION(); |
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ImGui::CreateContext(); |
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(void)ImGui::GetIO(); |
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ImGui_ImplMetal_Init(_device); |
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ImGui::StyleColorsDark(); |
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} |
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return self; |
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} |
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- (void)drawInMTKView:(MTKView *)view |
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{ |
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ImGuiIO &io = ImGui::GetIO(); |
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io.DisplaySize.x = view.bounds.size.width; |
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io.DisplaySize.y = view.bounds.size.height; |
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#if TARGET_OS_OSX |
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CGFloat framebufferScale = view.window.screen.backingScaleFactor ?: NSScreen.mainScreen.backingScaleFactor; |
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#else |
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CGFloat framebufferScale = view.window.screen.scale ?: UIScreen.mainScreen.scale; |
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#endif |
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io.DisplayFramebufferScale = ImVec2(framebufferScale, framebufferScale); |
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io.DeltaTime = 1 / float(view.preferredFramesPerSecond ?: 60); |
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id<MTLCommandBuffer> commandBuffer = [self.commandQueue commandBuffer]; |
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static bool show_demo_window = true; |
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static bool show_another_window = false; |
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static float clear_color[4] = { 0.28f, 0.36f, 0.5f, 1.0f }; |
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MTLRenderPassDescriptor *renderPassDescriptor = view.currentRenderPassDescriptor; |
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if(renderPassDescriptor != nil) |
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{ |
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renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clear_color[0], clear_color[1], clear_color[2], clear_color[3]); |
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// Here, you could do additional rendering work, including other passes as necessary. |
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id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor]; |
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[renderEncoder pushDebugGroup:@"Draw ImGui"]; |
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ImGui_ImplMetal_NewFrame(renderPassDescriptor); |
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#if TARGET_OS_OSX |
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ImGui_ImplOSX_NewFrame(view); |
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#endif |
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ImGui::NewFrame(); |
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{ |
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static float f = 0.0f; |
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static int counter = 0; |
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ImGui::Text("Hello, world!"); // Display some text (you can use a format string too) |
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ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f |
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ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color |
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ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our windows open/close state |
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ImGui::Checkbox("Another Window", &show_another_window); |
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if (ImGui::Button("Button")) // Buttons return true when clicked (NB: most widgets return true when edited/activated) |
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counter++; |
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ImGui::SameLine(); |
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ImGui::Text("counter = %d", counter); |
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ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate); |
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} |
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// 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name your windows. |
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if (show_another_window) |
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{ |
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ImGui::Begin("Another Window", &show_another_window); |
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ImGui::Text("Hello from another window!"); |
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if (ImGui::Button("Close Me")) |
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show_another_window = false; |
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ImGui::End(); |
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} |
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// 3. Show the ImGui demo window. Most of the sample code is in ImGui::ShowDemoWindow(). Read its code to learn more about Dear ImGui! |
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if (show_demo_window) |
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{ |
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// Normally user code doesn't need/want to call this because positions are saved in .ini file anyway. |
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// Here we just want to make the demo initial state a bit more friendly! |
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ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver); |
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ImGui::ShowDemoWindow(&show_demo_window); |
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} |
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ImGui::Render(); |
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ImDrawData *drawData = ImGui::GetDrawData(); |
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ImGui_ImplMetal_RenderDrawData(drawData, commandBuffer, renderEncoder); |
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[renderEncoder popDebugGroup]; |
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[renderEncoder endEncoding]; |
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[commandBuffer presentDrawable:view.currentDrawable]; |
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} |
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[commandBuffer commit]; |
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} |
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- (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size |
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{ |
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} |
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@end |
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#import <Metal/Metal.h> |
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#import <MetalKit/MetalKit.h> |
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#import "Renderer.h" |
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#if TARGET_OS_IPHONE |
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#import <UIKit/UIKit.h> |
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@interface ViewController : UIViewController |
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@end |
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#else |
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#import <Cocoa/Cocoa.h> |
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@interface ViewController : NSViewController |
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@end |
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#endif |
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#import "ViewController.h" |
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#import "Renderer.h" |
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#include "imgui.h" |
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#if TARGET_OS_OSX |
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#include "imgui_impl_osx.h" |
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#endif |
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@interface ViewController () |
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@property (nonatomic, readonly) MTKView *mtkView; |
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@property (nonatomic, strong) Renderer *renderer; |
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@end |
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@implementation ViewController |
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- (MTKView *)mtkView { |
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return (MTKView *)self.view; |
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} |
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- (void)viewDidLoad |
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{ |
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[super viewDidLoad]; |
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self.mtkView.device = MTLCreateSystemDefaultDevice(); |
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if (!self.mtkView.device) { |
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NSLog(@"Metal is not supported"); |
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abort(); |
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} |
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self.renderer = [[Renderer alloc] initWithView:self.mtkView]; |
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[self.renderer mtkView:self.mtkView drawableSizeWillChange:self.mtkView.bounds.size]; |
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self.mtkView.delegate = self.renderer; |
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#if TARGET_OS_OSX |
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// Add a tracking area in order to receive mouse events whenever the mouse is within the bounds of our view |
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NSTrackingArea *trackingArea = [[NSTrackingArea alloc] initWithRect:NSZeroRect |
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options:NSTrackingMouseMoved | NSTrackingInVisibleRect | NSTrackingActiveAlways |
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owner:self |
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userInfo:nil]; |
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[self.view addTrackingArea:trackingArea]; |
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// If we want to receive key events, we either need to be in the responder chain of the key view, |
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// or else we can install a local monitor. The consequence of this heavy-handed approach is that |
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// we receive events for all controls, not just ImGui widgets. If we had native controls in our |
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// window, we'd want to be much more careful than just ingesting the complete event stream, though |
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// we do make an effort to be good citizens by passing along events when ImGui doesn't want to capture. |
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NSEventMask eventMask = NSEventMaskKeyDown | NSEventMaskKeyUp | NSEventMaskFlagsChanged | NSEventTypeScrollWheel; |
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[NSEvent addLocalMonitorForEventsMatchingMask:eventMask handler:^NSEvent * _Nullable(NSEvent *event) { |
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BOOL wantsCapture = ImGui_ImplOSX_HandleEvent(event, self.view); |
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if (event.type == NSEventTypeKeyDown && wantsCapture) { |
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return nil; |
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} else { |
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return event; |
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} |
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}]; |
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ImGui_ImplOSX_Init(); |
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#endif |
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} |
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#if TARGET_OS_OSX |
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- (void)mouseMoved:(NSEvent *)event { |
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ImGui_ImplOSX_HandleEvent(event, self.view); |
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} |
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- (void)mouseDown:(NSEvent *)event { |
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ImGui_ImplOSX_HandleEvent(event, self.view); |
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} |
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- (void)mouseUp:(NSEvent *)event { |
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ImGui_ImplOSX_HandleEvent(event, self.view); |
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} |
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- (void)mouseDragged:(NSEvent *)event { |
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ImGui_ImplOSX_HandleEvent(event, self.view); |
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} |
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- (void)scrollWheel:(NSEvent *)event { |
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ImGui_ImplOSX_HandleEvent(event, self.view); |
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} |
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#elif TARGET_OS_IOS |
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// This touch mapping is super cheesy/hacky. We treat any touch on the screen |
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// as if it were a depressed left mouse button, and we don't bother handling |
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// multitouch correctly at all. This causes the "cursor" to behave very erratically |
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// when there are multiple active touches. But for demo purposes, single-touch |
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// interaction actually works surprisingly well. |
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- (void)updateIOWithTouchEvent:(UIEvent *)event { |
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UITouch *anyTouch = event.allTouches.anyObject; |
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CGPoint touchLocation = [anyTouch locationInView:self.view]; |
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ImGuiIO &io = ImGui::GetIO(); |
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io.MousePos = ImVec2(touchLocation.x, touchLocation.y); |
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BOOL hasActiveTouch = NO; |
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for (UITouch *touch in event.allTouches) { |
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if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled) { |
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hasActiveTouch = YES; |
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break; |
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} |
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} |
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io.MouseDown[0] = hasActiveTouch; |
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} |
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- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { |
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[self updateIOWithTouchEvent:event]; |
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} |
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- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { |
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[self updateIOWithTouchEvent:event]; |
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} |
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- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { |
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[self updateIOWithTouchEvent:event]; |
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} |
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- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { |
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[self updateIOWithTouchEvent:event]; |
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} |
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#endif |
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@end |
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#import <TargetConditionals.h> |
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#if TARGET_OS_IPHONE |
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#import <UIKit/UIKit.h> |
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#import "AppDelegate.h" |
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int main(int argc, char * argv[]) { |
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@autoreleasepool { |
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return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); |
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} |
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} |
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#else |
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#import <Cocoa/Cocoa.h> |
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int main(int argc, const char * argv[]) { |
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return NSApplicationMain(argc, argv); |
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} |
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#endif |
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// !$*UTF8*$! |
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{ |
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archiveVersion = 1; |
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}; |
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objectVersion = 50; |
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||||
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||||
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||||
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name = Debug; |
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||||
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||||
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/* End XCBuildConfiguration section */ |
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rootObject = 8307E7B620E9F9C700473790 /* Project object */; |
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<?xml version="1.0" encoding="UTF-8"?> |
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<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14113" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BV1-FR-VrT"> |
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<device id="retina4_7" orientation="portrait"> |
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<adaptation id="fullscreen"/> |
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</device> |
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<dependencies> |
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<deployment identifier="iOS"/> |
||||
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/> |
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<capability name="Safe area layout guides" minToolsVersion="9.0"/> |
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<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/> |
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<scenes> |
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<?xml version="1.0" encoding="UTF-8"?> |
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> |
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<plist version="1.0"> |
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<dict> |
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<key>CFBundleDevelopmentRegion</key> |
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<string>$(DEVELOPMENT_LANGUAGE)</string> |
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<key>CFBundleExecutable</key> |
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<string>$(EXECUTABLE_NAME)</string> |
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<key>CFBundleIdentifier</key> |
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<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string> |
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<key>CFBundleInfoDictionaryVersion</key> |
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<string>6.0</string> |
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<key>CFBundleName</key> |
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<string>imgui</string> |
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<key>CFBundlePackageType</key> |
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<string>APPL</string> |
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<key>CFBundleShortVersionString</key> |
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<string>1.0</string> |
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<key>CFBundleVersion</key> |
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<string>1</string> |
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<key>LSRequiresIPhoneOS</key> |
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<true/> |
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<key>UILaunchStoryboardName</key> |
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<string>Launch Screen</string> |
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<key>UIMainStoryboardFile</key> |
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<string>Main</string> |
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<true/> |
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<array> |
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<string>UIInterfaceOrientationPortrait</string> |
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<string>UIInterfaceOrientationLandscapeLeft</string> |
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<string>UIInterfaceOrientationPortraitUpsideDown</string> |
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</array> |
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<key>UISupportedInterfaceOrientations~ipad</key> |
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<array> |
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<string>UIInterfaceOrientationPortrait</string> |
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<string>UIInterfaceOrientationPortraitUpsideDown</string> |
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<string>UIInterfaceOrientationLandscapeLeft</string> |
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<string>UIInterfaceOrientationLandscapeRight</string> |
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</array> |
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</plist> |
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<?xml version="1.0" encoding="UTF-8"?> |
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<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14269.14" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM"> |
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<device id="retina4_7" orientation="portrait"> |
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<deployment identifier="iOS"/> |
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<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/> |
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<scenes> |
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<scene sceneID="EHf-IW-A2E"> |
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<objects> |
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</view> |
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<point key="canvasLocation" x="53" y="375"/> |
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<?xml version="1.0" encoding="UTF-8"?> |
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<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="14269.14" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="B8D-0N-5wS"> |
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<dependencies> |
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<deployment identifier="macosx"/> |
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<plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14269.14"/> |
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<scenes> |
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<!--Application--> |
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<scene sceneID="JPo-4y-FX3"> |
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<objects> |
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<application id="hnw-xV-0zn" sceneMemberID="viewController"> |
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<modifierMask key="keyEquivalentModifierMask"/> |
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<items> |
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<menuItem title="Services" id="NMo-om-nkz"> |
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<modifierMask key="keyEquivalentModifierMask"/> |
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<!--Window Controller--> |
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<scene sceneID="R2V-B0-nI4"> |
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<objects> |
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<windowController id="B8D-0N-5wS" sceneMemberID="viewController"> |
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<window key="window" title="ImGui" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" titleVisibility="hidden" id="IQv-IB-iLA"> |
||||
<windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/> |
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<!--View Controller--> |
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<scene sceneID="hIz-AP-VOD"> |
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<objects> |
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<autoresizingMask key="autoresizingMask"/> |
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</view> |
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</viewController> |
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<customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/> |
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</scene> |
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</scenes> |
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</document> |
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@ -0,0 +1,32 @@ |
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<?xml version="1.0" encoding="UTF-8"?> |
||||
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> |
||||
<plist version="1.0"> |
||||
<dict> |
||||
<key>CFBundleDevelopmentRegion</key> |
||||
<string>$(DEVELOPMENT_LANGUAGE)</string> |
||||
<key>CFBundleExecutable</key> |
||||
<string>$(EXECUTABLE_NAME)</string> |
||||
<key>CFBundleIconFile</key> |
||||
<string></string> |
||||
<key>CFBundleIdentifier</key> |
||||
<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string> |
||||
<key>CFBundleInfoDictionaryVersion</key> |
||||
<string>6.0</string> |
||||
<key>CFBundleName</key> |
||||
<string>imgui</string> |
||||
<key>CFBundlePackageType</key> |
||||
<string>APPL</string> |
||||
<key>CFBundleShortVersionString</key> |
||||
<string>1.0</string> |
||||
<key>CFBundleVersion</key> |
||||
<string>1</string> |
||||
<key>LSMinimumSystemVersion</key> |
||||
<string>$(MACOSX_DEPLOYMENT_TARGET)</string> |
||||
<key>NSHumanReadableCopyright</key> |
||||
<string>Copyright © 2018 Warren Moore. All rights reserved.</string> |
||||
<key>NSMainStoryboardFile</key> |
||||
<string>Main</string> |
||||
<key>NSPrincipalClass</key> |
||||
<string>NSApplication</string> |
||||
</dict> |
||||
</plist> |
||||
@ -0,0 +1,25 @@ |
||||
// ImGui Renderer for: Metal
|
||||
// This needs to be used along with a Platform Binding (e.g. OSX)
|
||||
|
||||
// Implemented features:
|
||||
// [X] Renderer: User texture binding. Use 'MTLTexture' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
|
||||
|
||||
// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
|
||||
// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
|
||||
// https://github.com/ocornut/imgui
|
||||
|
||||
@class MTLRenderPassDescriptor; |
||||
@protocol MTLDevice, MTLCommandBuffer, MTLRenderCommandEncoder; |
||||
|
||||
IMGUI_IMPL_API bool ImGui_ImplMetal_Init(id<MTLDevice> device); |
||||
IMGUI_IMPL_API void ImGui_ImplMetal_Shutdown(); |
||||
IMGUI_IMPL_API void ImGui_ImplMetal_NewFrame(MTLRenderPassDescriptor *renderPassDescriptor); |
||||
IMGUI_IMPL_API void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, |
||||
id<MTLCommandBuffer> commandBuffer, |
||||
id<MTLRenderCommandEncoder> commandEncoder); |
||||
|
||||
// Called by Init/NewFrame/Shutdown
|
||||
IMGUI_IMPL_API bool ImGui_ImplMetal_CreateFontsTexture(id<MTLDevice> device); |
||||
IMGUI_IMPL_API void ImGui_ImplMetal_DestroyFontsTexture(); |
||||
IMGUI_IMPL_API bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device); |
||||
IMGUI_IMPL_API void ImGui_ImplMetal_DestroyDeviceObjects(); |
||||
@ -0,0 +1,490 @@ |
||||
// ImGui Renderer for: Metal |
||||
// This needs to be used along with a Platform Binding (e.g. OSX) |
||||
|
||||
// Implemented features: |
||||
// [X] Renderer: User texture binding. Use 'MTLTexture' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp. |
||||
|
||||
// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this. |
||||
// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp. |
||||
// https://github.com/ocornut/imgui |
||||
|
||||
// CHANGELOG |
||||
// (minor and older changes stripped away, please see git history for details) |
||||
// 2018-07-05: Metal: Added new Metal backend implementation |
||||
|
||||
#include "imgui.h" |
||||
#include "imgui_impl_metal.h" |
||||
|
||||
#import <Metal/Metal.h> |
||||
#import <QuartzCore/CAMetalLayer.h> |
||||
#import <simd/simd.h> |
||||
|
||||
#pragma mark - Support classes |
||||
|
||||
// A wrapper around a MTLBuffer object that knows the last time it was reused |
||||
@interface MetalBuffer : NSObject |
||||
@property (nonatomic, strong) id<MTLBuffer> buffer; |
||||
@property (nonatomic, assign) NSTimeInterval lastReuseTime; |
||||
- (instancetype)initWithBuffer:(id<MTLBuffer>)buffer; |
||||
@end |
||||
|
||||
// An object that encapsulates the data necessary to uniquely identify a |
||||
// render pipeline state. These are used as cache keys. |
||||
@interface FramebufferDescriptor : NSObject<NSCopying> |
||||
@property (nonatomic, assign) unsigned long sampleCount; |
||||
@property (nonatomic, assign) MTLPixelFormat colorPixelFormat; |
||||
@property (nonatomic, assign) MTLPixelFormat depthPixelFormat; |
||||
@property (nonatomic, assign) MTLPixelFormat stencilPixelFormat; |
||||
- (instancetype)initWithRenderPassDescriptor:(MTLRenderPassDescriptor *)renderPassDescriptor; |
||||
@end |
||||
|
||||
// A singleton that stores long-lived objects that are needed by the Metal |
||||
// renderer backend. Stores the render pipeline state cache and the default |
||||
// font texture, and manages the reusable buffer cache. |
||||
@interface MetalContext : NSObject |
||||
@property (nonatomic, strong) id<MTLDepthStencilState> depthStencilState; |
||||
@property (nonatomic, strong) FramebufferDescriptor *framebufferDescriptor; // framebuffer descriptor for current frame; transient |
||||
@property (nonatomic, strong) NSMutableDictionary *renderPipelineStateCache; // pipeline cache; keyed on framebuffer descriptors |
||||
@property (nonatomic, strong, nullable) id<MTLTexture> fontTexture; |
||||
@property (nonatomic, strong) NSMutableArray<MetalBuffer *> *bufferCache; |
||||
@property (nonatomic, assign) NSTimeInterval lastBufferCachePurge; |
||||
- (void)makeDeviceObjectsWithDevice:(id<MTLDevice>)device; |
||||
- (void)makeFontTextureWithDevice:(id<MTLDevice>)device; |
||||
- (MetalBuffer *)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device; |
||||
- (void)enqueueReusableBuffer:(MetalBuffer *)buffer; |
||||
- (id<MTLRenderPipelineState>)renderPipelineStateForFrameAndDevice:(id<MTLDevice>)device; |
||||
- (void)emptyRenderPipelineStateCache; |
||||
- (void)renderDrawData:(ImDrawData *)drawData |
||||
commandBuffer:(id<MTLCommandBuffer>)commandBuffer |
||||
commandEncoder:(id<MTLRenderCommandEncoder>)commandEncoder; |
||||
@end |
||||
|
||||
static MetalContext *g_sharedMetalContext = nil; |
||||
|
||||
#pragma mark - ImGui API implementation |
||||
|
||||
bool ImGui_ImplMetal_Init(id<MTLDevice> device) |
||||
{ |
||||
static dispatch_once_t onceToken; |
||||
dispatch_once(&onceToken, ^{ |
||||
g_sharedMetalContext = [[MetalContext alloc] init]; |
||||
}); |
||||
|
||||
ImGui_ImplMetal_CreateDeviceObjects(device); |
||||
|
||||
return true; |
||||
} |
||||
|
||||
void ImGui_ImplMetal_Shutdown() |
||||
{ |
||||
ImGui_ImplMetal_DestroyDeviceObjects(); |
||||
} |
||||
|
||||
void ImGui_ImplMetal_NewFrame(MTLRenderPassDescriptor *renderPassDescriptor) |
||||
{ |
||||
IM_ASSERT(g_sharedMetalContext != nil && "No Metal context. Did you call ImGui_ImplMetal_Init?"); |
||||
|
||||
g_sharedMetalContext.framebufferDescriptor = [[FramebufferDescriptor alloc] initWithRenderPassDescriptor:renderPassDescriptor]; |
||||
} |
||||
|
||||
// Metal Render function. |
||||
void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer> commandBuffer, id<MTLRenderCommandEncoder> commandEncoder) |
||||
{ |
||||
[g_sharedMetalContext renderDrawData:draw_data commandBuffer:commandBuffer commandEncoder:commandEncoder]; |
||||
} |
||||
|
||||
bool ImGui_ImplMetal_CreateFontsTexture(id<MTLDevice> device) |
||||
{ |
||||
[g_sharedMetalContext makeFontTextureWithDevice:device]; |
||||
|
||||
ImGuiIO& io = ImGui::GetIO(); |
||||
io.Fonts->TexID = (__bridge void *)g_sharedMetalContext.fontTexture; |
||||
|
||||
return (g_sharedMetalContext.fontTexture != nil); |
||||
} |
||||
|
||||
void ImGui_ImplMetal_DestroyFontsTexture() |
||||
{ |
||||
ImGuiIO& io = ImGui::GetIO(); |
||||
g_sharedMetalContext.fontTexture = nil; |
||||
io.Fonts->TexID = nullptr; |
||||
} |
||||
|
||||
bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device) |
||||
{ |
||||
[g_sharedMetalContext makeDeviceObjectsWithDevice:device]; |
||||
|
||||
ImGui_ImplMetal_CreateFontsTexture(device); |
||||
|
||||
return true; |
||||
} |
||||
|
||||
void ImGui_ImplMetal_DestroyDeviceObjects() |
||||
{ |
||||
ImGui_ImplMetal_DestroyFontsTexture(); |
||||
[g_sharedMetalContext emptyRenderPipelineStateCache]; |
||||
} |
||||
|
||||
#pragma mark - MetalBuffer implementation |
||||
|
||||
@implementation MetalBuffer |
||||
- (instancetype)initWithBuffer:(id<MTLBuffer>)buffer { |
||||
if ((self = [super init])) { |
||||
_buffer = buffer; |
||||
_lastReuseTime = [NSDate date].timeIntervalSince1970; |
||||
} |
||||
return self; |
||||
} |
||||
@end |
||||
|
||||
#pragma mark - FramebufferDescriptor implementation |
||||
|
||||
@implementation FramebufferDescriptor |
||||
- (instancetype)initWithRenderPassDescriptor:(MTLRenderPassDescriptor *)renderPassDescriptor { |
||||
if ((self = [super init])) { |
||||
_sampleCount = renderPassDescriptor.colorAttachments[0].texture.sampleCount; |
||||
_colorPixelFormat = renderPassDescriptor.colorAttachments[0].texture.pixelFormat; |
||||
_depthPixelFormat = renderPassDescriptor.depthAttachment.texture.pixelFormat; |
||||
_stencilPixelFormat = renderPassDescriptor.stencilAttachment.texture.pixelFormat; |
||||
} |
||||
return self; |
||||
} |
||||
|
||||
- (nonnull id)copyWithZone:(nullable NSZone *)zone { |
||||
FramebufferDescriptor *copy = [[FramebufferDescriptor allocWithZone:zone] init]; |
||||
copy.sampleCount = self.sampleCount; |
||||
copy.colorPixelFormat = self.colorPixelFormat; |
||||
copy.depthPixelFormat = self.depthPixelFormat; |
||||
copy.stencilPixelFormat = self.stencilPixelFormat; |
||||
return copy; |
||||
} |
||||
|
||||
- (NSUInteger)hash { |
||||
NSUInteger sc = _sampleCount & 0x3; |
||||
NSUInteger cf = _colorPixelFormat & 0x3FF; |
||||
NSUInteger df = _depthPixelFormat & 0x3FF; |
||||
NSUInteger sf = _stencilPixelFormat & 0x3FF; |
||||
NSUInteger hash = (sf << 22) | (df << 12) | (cf << 2) | sc; |
||||
return hash; |
||||
} |
||||
|
||||
- (BOOL)isEqual:(id)object { |
||||
FramebufferDescriptor *other = object; |
||||
if (![other isKindOfClass:[FramebufferDescriptor class]]) { |
||||
return NO; |
||||
} |
||||
return other.sampleCount == self.sampleCount && |
||||
other.colorPixelFormat == self.colorPixelFormat && |
||||
other.depthPixelFormat == self.depthPixelFormat && |
||||
other.stencilPixelFormat == self.stencilPixelFormat; |
||||
} |
||||
|
||||
@end |
||||
|
||||
#pragma mark - MetalContext implementation |
||||
|
||||
@implementation MetalContext |
||||
- (instancetype)init { |
||||
if ((self = [super init])) { |
||||
_renderPipelineStateCache = [NSMutableDictionary dictionary]; |
||||
_bufferCache = [NSMutableArray array]; |
||||
_lastBufferCachePurge = [NSDate date].timeIntervalSince1970; |
||||
} |
||||
return self; |
||||
} |
||||
|
||||
- (void)makeDeviceObjectsWithDevice:(id<MTLDevice>)device { |
||||
MTLDepthStencilDescriptor *depthStencilDescriptor = [[MTLDepthStencilDescriptor alloc] init]; |
||||
depthStencilDescriptor.depthWriteEnabled = NO; |
||||
depthStencilDescriptor.depthCompareFunction = MTLCompareFunctionAlways; |
||||
self.depthStencilState = [device newDepthStencilStateWithDescriptor:depthStencilDescriptor]; |
||||
} |
||||
|
||||
- (void)makeFontTextureWithDevice:(id<MTLDevice>)device { |
||||
ImGuiIO &io = ImGui::GetIO(); |
||||
unsigned char* pixels; |
||||
int width, height; |
||||
io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); |
||||
MTLTextureDescriptor *textureDescriptor = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm |
||||
width:width |
||||
height:height |
||||
mipmapped:NO]; |
||||
textureDescriptor.usage = MTLTextureUsageShaderRead; |
||||
#if TARGET_OS_OSX |
||||
textureDescriptor.storageMode = MTLStorageModeManaged; |
||||
#else |
||||
textureDescriptor.storageMode = MTLStorageModeShared; |
||||
#endif |
||||
id <MTLTexture> texture = [device newTextureWithDescriptor:textureDescriptor]; |
||||
[texture replaceRegion:MTLRegionMake2D(0, 0, width, height) mipmapLevel:0 withBytes:pixels bytesPerRow:width * 4]; |
||||
self.fontTexture = texture; |
||||
} |
||||
|
||||
- (MetalBuffer *)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device { |
||||
NSTimeInterval now = [NSDate date].timeIntervalSince1970; |
||||
|
||||
// Purge old buffers that haven't been useful for a while |
||||
if (now - self.lastBufferCachePurge > 1.0) { |
||||
NSMutableArray *survivors = [NSMutableArray array]; |
||||
for (MetalBuffer *candidate in self.bufferCache) { |
||||
if (candidate.lastReuseTime > self.lastBufferCachePurge) { |
||||
[survivors addObject:candidate]; |
||||
} |
||||
} |
||||
self.bufferCache = [survivors mutableCopy]; |
||||
self.lastBufferCachePurge = now; |
||||
} |
||||
|
||||
// See if we have a buffer we can reuse |
||||
MetalBuffer *bestCandidate = nil; |
||||
for (MetalBuffer *candidate in self.bufferCache) { |
||||
if (candidate.buffer.length >= length && (bestCandidate == nil || bestCandidate.lastReuseTime > candidate.lastReuseTime)) { |
||||
bestCandidate = candidate; |
||||
} |
||||
} |
||||
|
||||
if (bestCandidate != nil) { |
||||
[self.bufferCache removeObject:bestCandidate]; |
||||
bestCandidate.lastReuseTime = now; |
||||
return bestCandidate; |
||||
} |
||||
|
||||
// No luck; make a new buffer |
||||
id<MTLBuffer> backing = [device newBufferWithLength:length options:MTLResourceStorageModeShared]; |
||||
return [[MetalBuffer alloc] initWithBuffer:backing]; |
||||
} |
||||
|
||||
- (void)enqueueReusableBuffer:(MetalBuffer *)buffer { |
||||
[self.bufferCache addObject:buffer]; |
||||
} |
||||
|
||||
- (_Nullable id<MTLRenderPipelineState>)renderPipelineStateForFrameAndDevice:(id<MTLDevice>)device { |
||||
// Try to retrieve a render pipeline state that is compatible with the framebuffer config for this frame |
||||
// Thie hit rate for this cache should be very near 100%. |
||||
id<MTLRenderPipelineState> renderPipelineState = self.renderPipelineStateCache[self.framebufferDescriptor]; |
||||
|
||||
if (renderPipelineState == nil) { |
||||
// No luck; make a new render pipeline state |
||||
renderPipelineState = [self _renderPipelineStateForFramebufferDescriptor:self.framebufferDescriptor device:device]; |
||||
// Cache render pipeline state for later reuse |
||||
self.renderPipelineStateCache[self.framebufferDescriptor] = renderPipelineState; |
||||
} |
||||
|
||||
return renderPipelineState; |
||||
} |
||||
|
||||
- (id<MTLRenderPipelineState>)_renderPipelineStateForFramebufferDescriptor:(FramebufferDescriptor *)descriptor device:(id<MTLDevice>)device |
||||
{ |
||||
NSError *error = nil; |
||||
|
||||
NSString *shaderSource = @"" |
||||
"#include <metal_stdlib>\n" |
||||
"using namespace metal;\n" |
||||
"\n" |
||||
"struct Uniforms {\n" |
||||
" float4x4 projectionMatrix;\n" |
||||
"};\n" |
||||
"\n" |
||||
"struct VertexIn {\n" |
||||
" float2 position [[attribute(0)]];\n" |
||||
" float2 texCoords [[attribute(1)]];\n" |
||||
" uchar4 color [[attribute(2)]];\n" |
||||
"};\n" |
||||
"\n" |
||||
"struct VertexOut {\n" |
||||
" float4 position [[position]];\n" |
||||
" float2 texCoords;\n" |
||||
" float4 color;\n" |
||||
"};\n" |
||||
"\n" |
||||
"vertex VertexOut vertex_main(VertexIn in [[stage_in]],\n" |
||||
" constant Uniforms &uniforms [[buffer(1)]]) {\n" |
||||
" VertexOut out;\n" |
||||
" out.position = uniforms.projectionMatrix * float4(in.position, 0, 1);\n" |
||||
" out.texCoords = in.texCoords;\n" |
||||
" out.color = float4(in.color) / float4(255.0);\n" |
||||
" return out;\n" |
||||
"}\n" |
||||
"\n" |
||||
"fragment half4 fragment_main(VertexOut in [[stage_in]],\n" |
||||
" texture2d<half, access::sample> texture [[texture(0)]]) {\n" |
||||
" constexpr sampler linearSampler(coord::normalized, min_filter::linear, mag_filter::linear, mip_filter::linear);\n" |
||||
" half4 texColor = texture.sample(linearSampler, in.texCoords);\n" |
||||
" return half4(in.color) * texColor;\n" |
||||
"}\n"; |
||||
|
||||
id<MTLLibrary> library = [device newLibraryWithSource:shaderSource options:nil error:&error]; |
||||
if (library == nil) { |
||||
NSLog(@"Error: failed to create Metal library: %@", error); |
||||
return nil; |
||||
} |
||||
|
||||
id<MTLFunction> vertexFunction = [library newFunctionWithName:@"vertex_main"]; |
||||
id<MTLFunction> fragmentFunction = [library newFunctionWithName:@"fragment_main"]; |
||||
|
||||
if (vertexFunction == nil || fragmentFunction == nil) { |
||||
NSLog(@"Error: failed to find Metal shader functions in library: %@", error); |
||||
return nil; |
||||
} |
||||
|
||||
MTLVertexDescriptor *vertexDescriptor = [MTLVertexDescriptor vertexDescriptor]; |
||||
vertexDescriptor.attributes[0].offset = IM_OFFSETOF(ImDrawVert, pos); |
||||
vertexDescriptor.attributes[0].format = MTLVertexFormatFloat2; // position |
||||
vertexDescriptor.attributes[0].bufferIndex = 0; |
||||
vertexDescriptor.attributes[1].offset = IM_OFFSETOF(ImDrawVert, uv); |
||||
vertexDescriptor.attributes[1].format = MTLVertexFormatFloat2; // texCoords |
||||
vertexDescriptor.attributes[1].bufferIndex = 0; |
||||
vertexDescriptor.attributes[2].offset = IM_OFFSETOF(ImDrawVert, col); |
||||
vertexDescriptor.attributes[2].format = MTLVertexFormatUChar4; // color |
||||
vertexDescriptor.attributes[2].bufferIndex = 0; |
||||
vertexDescriptor.layouts[0].stepRate = 1; |
||||
vertexDescriptor.layouts[0].stepFunction = MTLVertexStepFunctionPerVertex; |
||||
vertexDescriptor.layouts[0].stride = sizeof(ImDrawVert); |
||||
|
||||
MTLRenderPipelineDescriptor *pipelineDescriptor = [[MTLRenderPipelineDescriptor alloc] init]; |
||||
pipelineDescriptor.vertexFunction = vertexFunction; |
||||
pipelineDescriptor.fragmentFunction = fragmentFunction; |
||||
pipelineDescriptor.vertexDescriptor = vertexDescriptor; |
||||
pipelineDescriptor.sampleCount = self.framebufferDescriptor.sampleCount; |
||||
pipelineDescriptor.colorAttachments[0].pixelFormat = self.framebufferDescriptor.colorPixelFormat; |
||||
pipelineDescriptor.colorAttachments[0].blendingEnabled = YES; |
||||
pipelineDescriptor.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd; |
||||
pipelineDescriptor.colorAttachments[0].alphaBlendOperation = MTLBlendOperationAdd; |
||||
pipelineDescriptor.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorSourceAlpha; |
||||
pipelineDescriptor.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorSourceAlpha; |
||||
pipelineDescriptor.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha; |
||||
pipelineDescriptor.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOneMinusSourceAlpha; |
||||
pipelineDescriptor.depthAttachmentPixelFormat = self.framebufferDescriptor.depthPixelFormat; |
||||
pipelineDescriptor.stencilAttachmentPixelFormat = self.framebufferDescriptor.stencilPixelFormat; |
||||
|
||||
id<MTLRenderPipelineState> renderPipelineState = [device newRenderPipelineStateWithDescriptor:pipelineDescriptor error:&error]; |
||||
if (error != nil) { |
||||
NSLog(@"Error: failed to create Metal pipeline state: %@", error); |
||||
} |
||||
|
||||
return renderPipelineState; |
||||
} |
||||
|
||||
- (void)emptyRenderPipelineStateCache { |
||||
[self.renderPipelineStateCache removeAllObjects]; |
||||
} |
||||
|
||||
- (void)renderDrawData:(ImDrawData *)drawData |
||||
commandBuffer:(id<MTLCommandBuffer>)commandBuffer |
||||
commandEncoder:(id<MTLRenderCommandEncoder>)commandEncoder |
||||
{ |
||||
// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates) |
||||
ImGuiIO &io = ImGui::GetIO(); |
||||
int fb_width = (int)(drawData->DisplaySize.x * io.DisplayFramebufferScale.x); |
||||
int fb_height = (int)(drawData->DisplaySize.y * io.DisplayFramebufferScale.y); |
||||
if (fb_width <= 0 || fb_height <= 0 || drawData->CmdListsCount == 0) |
||||
return; |
||||
drawData->ScaleClipRects(io.DisplayFramebufferScale); |
||||
|
||||
[commandEncoder setCullMode:MTLCullModeNone]; |
||||
[commandEncoder setDepthStencilState:g_sharedMetalContext.depthStencilState]; |
||||
|
||||
// Setup viewport, orthographic projection matrix |
||||
// Our visible imgui space lies from draw_data->DisplayPps (top left) to |
||||
// draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayMin is typically (0,0) for single viewport apps. |
||||
MTLViewport viewport = { .originX = 0.0, |
||||
.originY = 0.0, |
||||
.width = double(fb_width), |
||||
.height = double(fb_height), |
||||
.znear = 0.0, |
||||
.zfar = 1.0 }; |
||||
[commandEncoder setViewport:viewport]; |
||||
float L = drawData->DisplayPos.x; |
||||
float R = drawData->DisplayPos.x + drawData->DisplaySize.x; |
||||
float T = drawData->DisplayPos.y; |
||||
float B = drawData->DisplayPos.y + drawData->DisplaySize.y; |
||||
float N = viewport.znear; |
||||
float F = viewport.zfar; |
||||
const float ortho_projection[4][4] = |
||||
{ |
||||
{ 2.0f/(R-L), 0.0f, 0.0f, 0.0f }, |
||||
{ 0.0f, 2.0f/(T-B), 0.0f, 0.0f }, |
||||
{ 0.0f, 0.0f, 1/(F-N), 0.0f }, |
||||
{ (R+L)/(L-R), (T+B)/(B-T), N/(F-N), 1.0f }, |
||||
}; |
||||
|
||||
[commandEncoder setVertexBytes:&ortho_projection length:sizeof(ortho_projection) atIndex:1]; |
||||
|
||||
size_t vertexBufferLength = 0; |
||||
size_t indexBufferLength = 0; |
||||
for (int n = 0; n < drawData->CmdListsCount; n++) { |
||||
const ImDrawList* cmd_list = drawData->CmdLists[n]; |
||||
vertexBufferLength += cmd_list->VtxBuffer.Size * sizeof(ImDrawVert); |
||||
indexBufferLength += cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx); |
||||
} |
||||
|
||||
MetalBuffer *vertexBuffer = [self dequeueReusableBufferOfLength:vertexBufferLength device:commandBuffer.device]; |
||||
MetalBuffer *indexBuffer = [self dequeueReusableBufferOfLength:indexBufferLength device:commandBuffer.device]; |
||||
|
||||
id<MTLRenderPipelineState> renderPipelineState = [self renderPipelineStateForFrameAndDevice:commandBuffer.device]; |
||||
[commandEncoder setRenderPipelineState:renderPipelineState]; |
||||
|
||||
[commandEncoder setVertexBuffer:vertexBuffer.buffer offset:0 atIndex:0]; |
||||
|
||||
size_t vertexBufferOffset = 0; |
||||
size_t indexBufferOffset = 0; |
||||
ImVec2 pos = drawData->DisplayPos; |
||||
for (int n = 0; n < drawData->CmdListsCount; n++) |
||||
{ |
||||
const ImDrawList* cmd_list = drawData->CmdLists[n]; |
||||
ImDrawIdx idx_buffer_offset = 0; |
||||
|
||||
memcpy((char *)vertexBuffer.buffer.contents + vertexBufferOffset, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert)); |
||||
memcpy((char *)indexBuffer.buffer.contents + indexBufferOffset, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx)); |
||||
|
||||
[commandEncoder setVertexBufferOffset:vertexBufferOffset atIndex:0]; |
||||
|
||||
for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++) |
||||
{ |
||||
const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i]; |
||||
if (pcmd->UserCallback) |
||||
{ |
||||
// User callback (registered via ImDrawList::AddCallback) |
||||
pcmd->UserCallback(cmd_list, pcmd); |
||||
} |
||||
else |
||||
{ |
||||
ImVec4 clip_rect = ImVec4(pcmd->ClipRect.x - pos.x, pcmd->ClipRect.y - pos.y, pcmd->ClipRect.z - pos.x, pcmd->ClipRect.w - pos.y); |
||||
if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0f && clip_rect.w >= 0.0f) |
||||
{ |
||||
// Apply scissor/clipping rectangle |
||||
MTLScissorRect scissorRect = { .x = NSUInteger(clip_rect.x), |
||||
.y = NSUInteger(clip_rect.y), |
||||
.width = NSUInteger(clip_rect.z - clip_rect.x), |
||||
.height = NSUInteger(clip_rect.w - clip_rect.y) }; |
||||
[commandEncoder setScissorRect:scissorRect]; |
||||
|
||||
|
||||
// Bind texture, Draw |
||||
if (pcmd->TextureId != NULL) { |
||||
[commandEncoder setFragmentTexture:(__bridge id<MTLTexture>)(pcmd->TextureId) atIndex:0]; |
||||
} |
||||
[commandEncoder drawIndexedPrimitives:MTLPrimitiveTypeTriangle |
||||
indexCount:pcmd->ElemCount |
||||
indexType:sizeof(ImDrawIdx) == 2 ? MTLIndexTypeUInt16 : MTLIndexTypeUInt32 |
||||
indexBuffer:indexBuffer.buffer |
||||
indexBufferOffset:indexBufferOffset + idx_buffer_offset]; |
||||
} |
||||
} |
||||
idx_buffer_offset += pcmd->ElemCount * sizeof(ImDrawIdx); |
||||
} |
||||
|
||||
vertexBufferOffset += cmd_list->VtxBuffer.Size * sizeof(ImDrawVert); |
||||
indexBufferOffset += cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx); |
||||
} |
||||
|
||||
__weak id weakSelf = self; |
||||
[commandBuffer addCompletedHandler:^(id<MTLCommandBuffer>) { |
||||
dispatch_async(dispatch_get_main_queue(), ^{ |
||||
[weakSelf enqueueReusableBuffer:vertexBuffer]; |
||||
[weakSelf enqueueReusableBuffer:indexBuffer]; |
||||
}); |
||||
}]; |
||||
} |
||||
|
||||
@end |
||||
Loading…
Reference in New Issue