Introduced a new Metal renderer implementation and a new example illustrating usage of Metal on macOS and iOS (partially addresses #1873)
Warren Moore
6 years ago
parent
deb7aa29cd
commit
d64157e803
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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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@ -0,0 +1,23 @@
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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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classes = {
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};
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objectVersion = 50;
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objects = {
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
<segue destination="XfG-lQ-9wD" kind="relationship" relationship="window.shadowedContentViewController" id="cq2-FE-JQM"/>
|
||||
</connections>
|
||||
</windowController>
|
||||
<customObject id="Oky-zY-oP4" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
|
||||
</objects>
|
||||
<point key="canvasLocation" x="-128" y="390"/>
|
||||
</scene>
|
||||
<!--View Controller-->
|
||||
<scene sceneID="hIz-AP-VOD">
|
||||
<objects>
|
||||
<viewController id="XfG-lQ-9wD" customClass="ViewController" sceneMemberID="viewController">
|
||||
<view key="view" wantsLayer="YES" id="m2S-Jp-Qdl" customClass="MTKView">
|
||||
<rect key="frame" x="0.0" y="0.0" width="1280" height="720"/>
|
||||
<autoresizingMask key="autoresizingMask"/>
|
||||
</view>
|
||||
</viewController>
|
||||
<customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
|
||||
</objects>
|
||||
<point key="canvasLocation" x="205" y="1032"/>
|
||||
</scene>
|
||||
</scenes>
|
||||
</document>
|
||||
@ -0,0 +1,32 @@
|
||||
<?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