diff --git a/examples/example_apple_metal/README.md b/examples/example_apple_metal/README.md new file mode 100644 index 000000000000..d43b4925aad6 --- /dev/null +++ b/examples/example_apple_metal/README.md @@ -0,0 +1,6 @@ +# iOS / OSX Metal example + +## Introduction + +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. + diff --git a/examples/example_apple_metal/Shared/AppDelegate.h b/examples/example_apple_metal/Shared/AppDelegate.h new file mode 100644 index 000000000000..c4632b1f13b5 --- /dev/null +++ b/examples/example_apple_metal/Shared/AppDelegate.h @@ -0,0 +1,19 @@ + +#import + +#if TARGET_OS_IPHONE + +#import + +@interface AppDelegate : UIResponder +@property (strong, nonatomic) UIWindow *window; +@end + +#else + +#import + +@interface AppDelegate : NSObject +@end + +#endif diff --git a/examples/example_apple_metal/Shared/AppDelegate.m b/examples/example_apple_metal/Shared/AppDelegate.m new file mode 100644 index 000000000000..eabb44c14cc0 --- /dev/null +++ b/examples/example_apple_metal/Shared/AppDelegate.m @@ -0,0 +1,12 @@ + +#import "AppDelegate.h" + +@implementation AppDelegate + +#if TARGET_OS_OSX +- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender { + return YES; +} +#endif + +@end diff --git a/examples/example_apple_metal/Shared/Renderer.h b/examples/example_apple_metal/Shared/Renderer.h new file mode 100644 index 000000000000..f324915c7d5d --- /dev/null +++ b/examples/example_apple_metal/Shared/Renderer.h @@ -0,0 +1,9 @@ + +#import + +@interface Renderer : NSObject + +-(nonnull instancetype)initWithView:(nonnull MTKView *)view; + +@end + diff --git a/examples/example_apple_metal/Shared/Renderer.mm b/examples/example_apple_metal/Shared/Renderer.mm new file mode 100644 index 000000000000..2f62ed179bfb --- /dev/null +++ b/examples/example_apple_metal/Shared/Renderer.mm @@ -0,0 +1,132 @@ + +#import "Renderer.h" +#import + +#include "imgui.h" +#include "imgui_impl_metal.h" + +#if TARGET_OS_OSX +#include "imgui_impl_osx.h" +#endif + +@interface Renderer () +@property (nonatomic, strong) id device; +@property (nonatomic, strong) id commandQueue; +@end + +@implementation Renderer + +-(nonnull instancetype)initWithView:(nonnull MTKView *)view; +{ + self = [super init]; + if(self) + { + _device = view.device; + _commandQueue = [_device newCommandQueue]; + + IMGUI_CHECKVERSION(); + ImGui::CreateContext(); + (void)ImGui::GetIO(); + + ImGui_ImplMetal_Init(_device); + + ImGui::StyleColorsDark(); + } + + return self; +} + +- (void)drawInMTKView:(MTKView *)view +{ + ImGuiIO &io = ImGui::GetIO(); + io.DisplaySize.x = view.bounds.size.width; + io.DisplaySize.y = view.bounds.size.height; + +#if TARGET_OS_OSX + CGFloat framebufferScale = view.window.screen.backingScaleFactor ?: NSScreen.mainScreen.backingScaleFactor; +#else + CGFloat framebufferScale = view.window.screen.scale ?: UIScreen.mainScreen.scale; +#endif + io.DisplayFramebufferScale = ImVec2(framebufferScale, framebufferScale); + + io.DeltaTime = 1 / float(view.preferredFramesPerSecond ?: 60); + + id commandBuffer = [self.commandQueue commandBuffer]; + + static bool show_demo_window = true; + static bool show_another_window = false; + static float clear_color[4] = { 0.28f, 0.36f, 0.5f, 1.0f }; + + MTLRenderPassDescriptor *renderPassDescriptor = view.currentRenderPassDescriptor; + if(renderPassDescriptor != nil) + { + renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clear_color[0], clear_color[1], clear_color[2], clear_color[3]); + + // Here, you could do additional rendering work, including other passes as necessary. + + id renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor]; + + [renderEncoder pushDebugGroup:@"Draw ImGui"]; + + ImGui_ImplMetal_NewFrame(renderPassDescriptor); +#if TARGET_OS_OSX + ImGui_ImplOSX_NewFrame(view); +#endif + ImGui::NewFrame(); + + { + static float f = 0.0f; + static int counter = 0; + ImGui::Text("Hello, world!"); // Display some text (you can use a format string too) + ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f + ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color + + ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our windows open/close state + ImGui::Checkbox("Another Window", &show_another_window); + + if (ImGui::Button("Button")) // Buttons return true when clicked (NB: most widgets return true when edited/activated) + counter++; + ImGui::SameLine(); + ImGui::Text("counter = %d", counter); + + ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate); + } + + // 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name your windows. + if (show_another_window) + { + ImGui::Begin("Another Window", &show_another_window); + ImGui::Text("Hello from another window!"); + if (ImGui::Button("Close Me")) + show_another_window = false; + ImGui::End(); + } + + // 3. Show the ImGui demo window. Most of the sample code is in ImGui::ShowDemoWindow(). Read its code to learn more about Dear ImGui! + if (show_demo_window) + { + // Normally user code doesn't need/want to call this because positions are saved in .ini file anyway. + // Here we just want to make the demo initial state a bit more friendly! + ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver); + ImGui::ShowDemoWindow(&show_demo_window); + } + + ImGui::Render(); + ImDrawData *drawData = ImGui::GetDrawData(); + ImGui_ImplMetal_RenderDrawData(drawData, commandBuffer, renderEncoder); + + [renderEncoder popDebugGroup]; + + [renderEncoder endEncoding]; + + [commandBuffer presentDrawable:view.currentDrawable]; + } + + [commandBuffer commit]; +} + +- (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size +{ +} + +@end diff --git a/examples/example_apple_metal/Shared/ViewController.h b/examples/example_apple_metal/Shared/ViewController.h new file mode 100644 index 000000000000..a8aade130373 --- /dev/null +++ b/examples/example_apple_metal/Shared/ViewController.h @@ -0,0 +1,20 @@ + +#import +#import +#import "Renderer.h" + +#if TARGET_OS_IPHONE + +#import + +@interface ViewController : UIViewController +@end + +#else + +#import + +@interface ViewController : NSViewController +@end + +#endif diff --git a/examples/example_apple_metal/Shared/ViewController.mm b/examples/example_apple_metal/Shared/ViewController.mm new file mode 100644 index 000000000000..6a9236c4ad9e --- /dev/null +++ b/examples/example_apple_metal/Shared/ViewController.mm @@ -0,0 +1,130 @@ + +#import "ViewController.h" +#import "Renderer.h" +#include "imgui.h" + +#if TARGET_OS_OSX +#include "imgui_impl_osx.h" +#endif + +@interface ViewController () +@property (nonatomic, readonly) MTKView *mtkView; +@property (nonatomic, strong) Renderer *renderer; +@end + +@implementation ViewController + +- (MTKView *)mtkView { + return (MTKView *)self.view; +} + +- (void)viewDidLoad +{ + [super viewDidLoad]; + + self.mtkView.device = MTLCreateSystemDefaultDevice(); + + if (!self.mtkView.device) { + NSLog(@"Metal is not supported"); + abort(); + } + + self.renderer = [[Renderer alloc] initWithView:self.mtkView]; + + [self.renderer mtkView:self.mtkView drawableSizeWillChange:self.mtkView.bounds.size]; + + self.mtkView.delegate = self.renderer; + +#if TARGET_OS_OSX + // Add a tracking area in order to receive mouse events whenever the mouse is within the bounds of our view + NSTrackingArea *trackingArea = [[NSTrackingArea alloc] initWithRect:NSZeroRect + options:NSTrackingMouseMoved | NSTrackingInVisibleRect | NSTrackingActiveAlways + owner:self + userInfo:nil]; + [self.view addTrackingArea:trackingArea]; + + // If we want to receive key events, we either need to be in the responder chain of the key view, + // or else we can install a local monitor. The consequence of this heavy-handed approach is that + // we receive events for all controls, not just ImGui widgets. If we had native controls in our + // window, we'd want to be much more careful than just ingesting the complete event stream, though + // we do make an effort to be good citizens by passing along events when ImGui doesn't want to capture. + NSEventMask eventMask = NSEventMaskKeyDown | NSEventMaskKeyUp | NSEventMaskFlagsChanged | NSEventTypeScrollWheel; + [NSEvent addLocalMonitorForEventsMatchingMask:eventMask handler:^NSEvent * _Nullable(NSEvent *event) { + BOOL wantsCapture = ImGui_ImplOSX_HandleEvent(event, self.view); + if (event.type == NSEventTypeKeyDown && wantsCapture) { + return nil; + } else { + return event; + } + + }]; + + ImGui_ImplOSX_Init(); +#endif +} + +#if TARGET_OS_OSX + +- (void)mouseMoved:(NSEvent *)event { + ImGui_ImplOSX_HandleEvent(event, self.view); +} + +- (void)mouseDown:(NSEvent *)event { + ImGui_ImplOSX_HandleEvent(event, self.view); +} + +- (void)mouseUp:(NSEvent *)event { + ImGui_ImplOSX_HandleEvent(event, self.view); +} + +- (void)mouseDragged:(NSEvent *)event { + ImGui_ImplOSX_HandleEvent(event, self.view); +} + +- (void)scrollWheel:(NSEvent *)event { + ImGui_ImplOSX_HandleEvent(event, self.view); +} + +#elif TARGET_OS_IOS + +// This touch mapping is super cheesy/hacky. We treat any touch on the screen +// as if it were a depressed left mouse button, and we don't bother handling +// multitouch correctly at all. This causes the "cursor" to behave very erratically +// when there are multiple active touches. But for demo purposes, single-touch +// interaction actually works surprisingly well. +- (void)updateIOWithTouchEvent:(UIEvent *)event { + UITouch *anyTouch = event.allTouches.anyObject; + CGPoint touchLocation = [anyTouch locationInView:self.view]; + ImGuiIO &io = ImGui::GetIO(); + io.MousePos = ImVec2(touchLocation.x, touchLocation.y); + + BOOL hasActiveTouch = NO; + for (UITouch *touch in event.allTouches) { + if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled) { + hasActiveTouch = YES; + break; + } + } + io.MouseDown[0] = hasActiveTouch; +} + +- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { + [self updateIOWithTouchEvent:event]; +} + +- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { + [self updateIOWithTouchEvent:event]; +} + +- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { + [self updateIOWithTouchEvent:event]; +} + +- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { + [self updateIOWithTouchEvent:event]; +} + +#endif + +@end + diff --git a/examples/example_apple_metal/Shared/main.m b/examples/example_apple_metal/Shared/main.m new file mode 100644 index 000000000000..cd8468a7edb8 --- /dev/null +++ b/examples/example_apple_metal/Shared/main.m @@ -0,0 +1,23 @@ + +#import + +#if TARGET_OS_IPHONE + +#import +#import "AppDelegate.h" + +int main(int argc, char * argv[]) { + @autoreleasepool { + return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); + } +} + +#else + +#import + +int main(int argc, const char * argv[]) { + return NSApplicationMain(argc, argv); +} + +#endif diff --git a/examples/example_apple_metal/example_apple_metal.xcodeproj/project.pbxproj b/examples/example_apple_metal/example_apple_metal.xcodeproj/project.pbxproj new file mode 100644 index 000000000000..b1b6b4e74d42 --- /dev/null +++ b/examples/example_apple_metal/example_apple_metal.xcodeproj/project.pbxproj @@ -0,0 +1,541 @@ +// !$*UTF8*$! +{ + archiveVersion = 1; + classes = { + }; + objectVersion = 50; 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All rights reserved. + NSMainStoryboardFile + Main + NSPrincipalClass + NSApplication + + diff --git a/examples/imgui_impl_metal.h b/examples/imgui_impl_metal.h new file mode 100644 index 000000000000..c4f958b4f85b --- /dev/null +++ b/examples/imgui_impl_metal.h @@ -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 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 commandBuffer, + id commandEncoder); + +// Called by Init/NewFrame/Shutdown +IMGUI_IMPL_API bool ImGui_ImplMetal_CreateFontsTexture(id device); +IMGUI_IMPL_API void ImGui_ImplMetal_DestroyFontsTexture(); +IMGUI_IMPL_API bool ImGui_ImplMetal_CreateDeviceObjects(id device); +IMGUI_IMPL_API void ImGui_ImplMetal_DestroyDeviceObjects(); diff --git a/examples/imgui_impl_metal.mm b/examples/imgui_impl_metal.mm new file mode 100644 index 000000000000..99fdec7b640e --- /dev/null +++ b/examples/imgui_impl_metal.mm @@ -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 +#import +#import + +#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 buffer; +@property (nonatomic, assign) NSTimeInterval lastReuseTime; +- (instancetype)initWithBuffer:(id)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 +@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 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 fontTexture; +@property (nonatomic, strong) NSMutableArray *bufferCache; +@property (nonatomic, assign) NSTimeInterval lastBufferCachePurge; +- (void)makeDeviceObjectsWithDevice:(id)device; +- (void)makeFontTextureWithDevice:(id)device; +- (MetalBuffer *)dequeueReusableBufferOfLength:(NSUInteger)length device:(id)device; +- (void)enqueueReusableBuffer:(MetalBuffer *)buffer; +- (id)renderPipelineStateForFrameAndDevice:(id)device; +- (void)emptyRenderPipelineStateCache; +- (void)renderDrawData:(ImDrawData *)drawData + commandBuffer:(id)commandBuffer + commandEncoder:(id)commandEncoder; +@end + +static MetalContext *g_sharedMetalContext = nil; + +#pragma mark - ImGui API implementation + +bool ImGui_ImplMetal_Init(id 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 commandBuffer, id commandEncoder) +{ + [g_sharedMetalContext renderDrawData:draw_data commandBuffer:commandBuffer commandEncoder:commandEncoder]; +} + +bool ImGui_ImplMetal_CreateFontsTexture(id 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 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)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)device { + MTLDepthStencilDescriptor *depthStencilDescriptor = [[MTLDepthStencilDescriptor alloc] init]; + depthStencilDescriptor.depthWriteEnabled = NO; + depthStencilDescriptor.depthCompareFunction = MTLCompareFunctionAlways; + self.depthStencilState = [device newDepthStencilStateWithDescriptor:depthStencilDescriptor]; +} + +- (void)makeFontTextureWithDevice:(id)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 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)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 backing = [device newBufferWithLength:length options:MTLResourceStorageModeShared]; + return [[MetalBuffer alloc] initWithBuffer:backing]; +} + +- (void)enqueueReusableBuffer:(MetalBuffer *)buffer { + [self.bufferCache addObject:buffer]; +} + +- (_Nullable id)renderPipelineStateForFrameAndDevice:(id)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 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)_renderPipelineStateForFramebufferDescriptor:(FramebufferDescriptor *)descriptor device:(id)device +{ + NSError *error = nil; + + NSString *shaderSource = @"" + "#include \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 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 library = [device newLibraryWithSource:shaderSource options:nil error:&error]; + if (library == nil) { + NSLog(@"Error: failed to create Metal library: %@", error); + return nil; + } + + id vertexFunction = [library newFunctionWithName:@"vertex_main"]; + id 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 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)commandBuffer + commandEncoder:(id)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 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)(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) { + dispatch_async(dispatch_get_main_queue(), ^{ + [weakSelf enqueueReusableBuffer:vertexBuffer]; + [weakSelf enqueueReusableBuffer:indexBuffer]; + }); + }]; +} + +@end diff --git a/examples/imgui_impl_osx.h b/examples/imgui_impl_osx.h index bbe72fc97a43..6ad4bc38ac06 100644 --- a/examples/imgui_impl_osx.h +++ b/examples/imgui_impl_osx.h @@ -2,9 +2,8 @@ // This needs to be used along with a Renderer (e.g. OpenGL2, OpenGL3, Vulkan, Metal..) @class NSEvent; -@class NSVew; +@class NSView; -// FIXME-OSX: Try replacing with NSView IMGUI_API bool ImGui_ImplOSX_Init(); IMGUI_API void ImGui_ImplOSX_Shutdown(); IMGUI_API void ImGui_ImplOSX_NewFrame(NSView *_Nonnull view);