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Diffstat (limited to 'imgui-1.92.1/backends/imgui_impl_metal.mm')
| -rw-r--r-- | imgui-1.92.1/backends/imgui_impl_metal.mm | 652 |
1 files changed, 0 insertions, 652 deletions
diff --git a/imgui-1.92.1/backends/imgui_impl_metal.mm b/imgui-1.92.1/backends/imgui_impl_metal.mm deleted file mode 100644 index b1decb2..0000000 --- a/imgui-1.92.1/backends/imgui_impl_metal.mm +++ /dev/null @@ -1,652 +0,0 @@ -// dear imgui: Renderer Backend for Metal -// This needs to be used along with a Platform Backend (e.g. OSX) - -// Implemented features: -// [X] Renderer: User texture binding. Use 'MTLTexture' as texture identifier. Read the FAQ about ImTextureID/ImTextureRef! -// [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset). -// [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures). - -// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. -// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need. -// Learn about Dear ImGui: -// - FAQ https://dearimgui.com/faq -// - Getting Started https://dearimgui.com/getting-started -// - Documentation https://dearimgui.com/docs (same as your local docs/ folder). -// - Introduction, links and more at the top of imgui.cpp - -// CHANGELOG -// (minor and older changes stripped away, please see git history for details) -// 2025-06-11: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas. Removed ImGui_ImplMetal_CreateFontsTexture() and ImGui_ImplMetal_DestroyFontsTexture(). -// 2025-02-03: Metal: Crash fix. (#8367) -// 2024-01-08: Metal: Fixed memory leaks when using metal-cpp (#8276, #8166) or when using multiple contexts (#7419). -// 2022-08-23: Metal: Update deprecated property 'sampleCount'->'rasterSampleCount'. -// 2022-07-05: Metal: Add dispatch synchronization. -// 2022-06-30: Metal: Use __bridge for ARC based systems. -// 2022-06-01: Metal: Fixed null dereference on exit inside command buffer completion handler. -// 2022-04-27: Misc: Store backend data in a per-context struct, allowing to use this backend with multiple contexts. -// 2022-01-03: Metal: Ignore ImDrawCmd where ElemCount == 0 (very rare but can technically be manufactured by user code). -// 2021-12-30: Metal: Added Metal C++ support. Enable with '#define IMGUI_IMPL_METAL_CPP' in your imconfig.h file. -// 2021-08-24: Metal: Fixed a crash when clipping rect larger than framebuffer is submitted. (#4464) -// 2021-05-19: Metal: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement) -// 2021-02-18: Metal: Change blending equation to preserve alpha in output buffer. -// 2021-01-25: Metal: Fixed texture storage mode when building on Mac Catalyst. -// 2019-05-29: Metal: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag. -// 2019-04-30: Metal: Added support for special ImDrawCallback_ResetRenderState callback to reset render state. -// 2019-02-11: Metal: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display. -// 2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window. -// 2018-07-05: Metal: Added new Metal backend implementation. - -#include "imgui.h" -#ifndef IMGUI_DISABLE -#include "imgui_impl_metal.h" -#import <time.h> -#import <Metal/Metal.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) double 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 - -@interface MetalTexture : NSObject -@property (nonatomic, strong) id<MTLTexture> metalTexture; -- (instancetype)initWithTexture:(id<MTLTexture>)metalTexture; -@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<MTLDevice> device; -@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) NSMutableArray<MetalBuffer*>* bufferCache; -@property (nonatomic, assign) double lastBufferCachePurge; -- (MetalBuffer*)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device; -- (id<MTLRenderPipelineState>)renderPipelineStateForFramebufferDescriptor:(FramebufferDescriptor*)descriptor device:(id<MTLDevice>)device; -@end - -struct ImGui_ImplMetal_Data -{ - MetalContext* SharedMetalContext; - - ImGui_ImplMetal_Data() { memset((void*)this, 0, sizeof(*this)); } -}; - -static ImGui_ImplMetal_Data* ImGui_ImplMetal_GetBackendData() { return ImGui::GetCurrentContext() ? (ImGui_ImplMetal_Data*)ImGui::GetIO().BackendRendererUserData : nullptr; } -static void ImGui_ImplMetal_DestroyBackendData(){ IM_DELETE(ImGui_ImplMetal_GetBackendData()); } - -static inline CFTimeInterval GetMachAbsoluteTimeInSeconds() { return (CFTimeInterval)(double)(clock_gettime_nsec_np(CLOCK_UPTIME_RAW) / 1e9); } - -#ifdef IMGUI_IMPL_METAL_CPP - -#pragma mark - Dear ImGui Metal C++ Backend API - -bool ImGui_ImplMetal_Init(MTL::Device* device) -{ - return ImGui_ImplMetal_Init((__bridge id<MTLDevice>)(device)); -} - -void ImGui_ImplMetal_NewFrame(MTL::RenderPassDescriptor* renderPassDescriptor) -{ - ImGui_ImplMetal_NewFrame((__bridge MTLRenderPassDescriptor*)(renderPassDescriptor)); -} - -void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, - MTL::CommandBuffer* commandBuffer, - MTL::RenderCommandEncoder* commandEncoder) -{ - ImGui_ImplMetal_RenderDrawData(draw_data, - (__bridge id<MTLCommandBuffer>)(commandBuffer), - (__bridge id<MTLRenderCommandEncoder>)(commandEncoder)); - -} - -bool ImGui_ImplMetal_CreateDeviceObjects(MTL::Device* device) -{ - return ImGui_ImplMetal_CreateDeviceObjects((__bridge id<MTLDevice>)(device)); -} - -#endif // #ifdef IMGUI_IMPL_METAL_CPP - -#pragma mark - Dear ImGui Metal Backend API - -bool ImGui_ImplMetal_Init(id<MTLDevice> device) -{ - ImGuiIO& io = ImGui::GetIO(); - IMGUI_CHECKVERSION(); - IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!"); - - ImGui_ImplMetal_Data* bd = IM_NEW(ImGui_ImplMetal_Data)(); - io.BackendRendererUserData = (void*)bd; - io.BackendRendererName = "imgui_impl_metal"; - io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes. - io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures; // We can honor ImGuiPlatformIO::Textures[] requests during render. - - bd->SharedMetalContext = [[MetalContext alloc] init]; - bd->SharedMetalContext.device = device; - - return true; -} - -void ImGui_ImplMetal_Shutdown() -{ - ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); - IM_UNUSED(bd); - IM_ASSERT(bd != nullptr && "No renderer backend to shutdown, or already shutdown?"); - ImGui_ImplMetal_DestroyDeviceObjects(); - ImGui_ImplMetal_DestroyBackendData(); - - ImGuiIO& io = ImGui::GetIO(); - io.BackendRendererName = nullptr; - io.BackendRendererUserData = nullptr; - io.BackendFlags &= ~(ImGuiBackendFlags_RendererHasVtxOffset | ImGuiBackendFlags_RendererHasTextures); -} - -void ImGui_ImplMetal_NewFrame(MTLRenderPassDescriptor* renderPassDescriptor) -{ - ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); - IM_ASSERT(bd != nil && "Context or backend not initialized! Did you call ImGui_ImplMetal_Init()?"); -#ifdef IMGUI_IMPL_METAL_CPP - bd->SharedMetalContext.framebufferDescriptor = [[[FramebufferDescriptor alloc] initWithRenderPassDescriptor:renderPassDescriptor]autorelease]; -#else - bd->SharedMetalContext.framebufferDescriptor = [[FramebufferDescriptor alloc] initWithRenderPassDescriptor:renderPassDescriptor]; -#endif - if (bd->SharedMetalContext.depthStencilState == nil) - ImGui_ImplMetal_CreateDeviceObjects(bd->SharedMetalContext.device); -} - -static void ImGui_ImplMetal_SetupRenderState(ImDrawData* draw_data, id<MTLCommandBuffer> commandBuffer, - id<MTLRenderCommandEncoder> commandEncoder, id<MTLRenderPipelineState> renderPipelineState, - MetalBuffer* vertexBuffer, size_t vertexBufferOffset) -{ - IM_UNUSED(commandBuffer); - ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); - [commandEncoder setCullMode:MTLCullModeNone]; - [commandEncoder setDepthStencilState:bd->SharedMetalContext.depthStencilState]; - - // Setup viewport, orthographic projection matrix - // Our visible imgui space lies from draw_data->DisplayPos (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)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x), - .height = (double)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y), - .znear = 0.0, - .zfar = 1.0 - }; - [commandEncoder setViewport:viewport]; - - float L = draw_data->DisplayPos.x; - float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x; - float T = draw_data->DisplayPos.y; - float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y; - float N = (float)viewport.znear; - float F = (float)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]; - - [commandEncoder setRenderPipelineState:renderPipelineState]; - - [commandEncoder setVertexBuffer:vertexBuffer.buffer offset:0 atIndex:0]; - [commandEncoder setVertexBufferOffset:vertexBufferOffset atIndex:0]; -} - -// Metal Render function. -void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data, id<MTLCommandBuffer> commandBuffer, id<MTLRenderCommandEncoder> commandEncoder) -{ - ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); - MetalContext* ctx = bd->SharedMetalContext; - - // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates) - int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x); - int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y); - if (fb_width <= 0 || fb_height <= 0 || draw_data->CmdListsCount == 0) - return; - - // Catch up with texture updates. Most of the times, the list will have 1 element with an OK status, aka nothing to do. - // (This almost always points to ImGui::GetPlatformIO().Textures[] but is part of ImDrawData to allow overriding or disabling texture updates). - if (draw_data->Textures != nullptr) - for (ImTextureData* tex : *draw_data->Textures) - if (tex->Status != ImTextureStatus_OK) - ImGui_ImplMetal_UpdateTexture(tex); - - // Try to retrieve a render pipeline state that is compatible with the framebuffer config for this frame - // The hit rate for this cache should be very near 100%. - id<MTLRenderPipelineState> renderPipelineState = ctx.renderPipelineStateCache[ctx.framebufferDescriptor]; - if (renderPipelineState == nil) - { - // No luck; make a new render pipeline state - renderPipelineState = [ctx renderPipelineStateForFramebufferDescriptor:ctx.framebufferDescriptor device:commandBuffer.device]; - - // Cache render pipeline state for later reuse - ctx.renderPipelineStateCache[ctx.framebufferDescriptor] = renderPipelineState; - } - - size_t vertexBufferLength = (size_t)draw_data->TotalVtxCount * sizeof(ImDrawVert); - size_t indexBufferLength = (size_t)draw_data->TotalIdxCount * sizeof(ImDrawIdx); - MetalBuffer* vertexBuffer = [ctx dequeueReusableBufferOfLength:vertexBufferLength device:commandBuffer.device]; - MetalBuffer* indexBuffer = [ctx dequeueReusableBufferOfLength:indexBufferLength device:commandBuffer.device]; - - ImGui_ImplMetal_SetupRenderState(draw_data, commandBuffer, commandEncoder, renderPipelineState, vertexBuffer, 0); - - // Will project scissor/clipping rectangles into framebuffer space - ImVec2 clip_off = draw_data->DisplayPos; // (0,0) unless using multi-viewports - ImVec2 clip_scale = draw_data->FramebufferScale; // (1,1) unless using retina display which are often (2,2) - - // Render command lists - size_t vertexBufferOffset = 0; - size_t indexBufferOffset = 0; - for (int n = 0; n < draw_data->CmdListsCount; n++) - { - const ImDrawList* draw_list = draw_data->CmdLists[n]; - - memcpy((char*)vertexBuffer.buffer.contents + vertexBufferOffset, draw_list->VtxBuffer.Data, (size_t)draw_list->VtxBuffer.Size * sizeof(ImDrawVert)); - memcpy((char*)indexBuffer.buffer.contents + indexBufferOffset, draw_list->IdxBuffer.Data, (size_t)draw_list->IdxBuffer.Size * sizeof(ImDrawIdx)); - - for (int cmd_i = 0; cmd_i < draw_list->CmdBuffer.Size; cmd_i++) - { - const ImDrawCmd* pcmd = &draw_list->CmdBuffer[cmd_i]; - if (pcmd->UserCallback) - { - // User callback, registered via ImDrawList::AddCallback() - // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.) - if (pcmd->UserCallback == ImDrawCallback_ResetRenderState) - ImGui_ImplMetal_SetupRenderState(draw_data, commandBuffer, commandEncoder, renderPipelineState, vertexBuffer, vertexBufferOffset); - else - pcmd->UserCallback(draw_list, pcmd); - } - else - { - // Project scissor/clipping rectangles into framebuffer space - ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y); - ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y); - - // Clamp to viewport as setScissorRect() won't accept values that are off bounds - if (clip_min.x < 0.0f) { clip_min.x = 0.0f; } - if (clip_min.y < 0.0f) { clip_min.y = 0.0f; } - if (clip_max.x > fb_width) { clip_max.x = (float)fb_width; } - if (clip_max.y > fb_height) { clip_max.y = (float)fb_height; } - if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y) - continue; - if (pcmd->ElemCount == 0) // drawIndexedPrimitives() validation doesn't accept this - continue; - - // Apply scissor/clipping rectangle - MTLScissorRect scissorRect = - { - .x = NSUInteger(clip_min.x), - .y = NSUInteger(clip_min.y), - .width = NSUInteger(clip_max.x - clip_min.x), - .height = NSUInteger(clip_max.y - clip_min.y) - }; - [commandEncoder setScissorRect:scissorRect]; - - // Bind texture, Draw - if (ImTextureID tex_id = pcmd->GetTexID()) - [commandEncoder setFragmentTexture:(__bridge id<MTLTexture>)(void*)(intptr_t)(tex_id) atIndex:0]; - - [commandEncoder setVertexBufferOffset:(vertexBufferOffset + pcmd->VtxOffset * sizeof(ImDrawVert)) atIndex:0]; - [commandEncoder drawIndexedPrimitives:MTLPrimitiveTypeTriangle - indexCount:pcmd->ElemCount - indexType:sizeof(ImDrawIdx) == 2 ? MTLIndexTypeUInt16 : MTLIndexTypeUInt32 - indexBuffer:indexBuffer.buffer - indexBufferOffset:indexBufferOffset + pcmd->IdxOffset * sizeof(ImDrawIdx)]; - } - } - - vertexBufferOffset += (size_t)draw_list->VtxBuffer.Size * sizeof(ImDrawVert); - indexBufferOffset += (size_t)draw_list->IdxBuffer.Size * sizeof(ImDrawIdx); - } - - MetalContext* sharedMetalContext = bd->SharedMetalContext; - [commandBuffer addCompletedHandler:^(id<MTLCommandBuffer>) - { - dispatch_async(dispatch_get_main_queue(), ^{ - @synchronized(sharedMetalContext.bufferCache) - { - [sharedMetalContext.bufferCache addObject:vertexBuffer]; - [sharedMetalContext.bufferCache addObject:indexBuffer]; - } - }); - }]; -} - -static void ImGui_ImplMetal_DestroyTexture(ImTextureData* tex) -{ - MetalTexture* backend_tex = (__bridge_transfer MetalTexture*)(tex->BackendUserData); - if (backend_tex == nullptr) - return; - IM_ASSERT(backend_tex.metalTexture == (__bridge id<MTLTexture>)(void*)(intptr_t)tex->TexID); - backend_tex.metalTexture = nil; - - // Clear identifiers and mark as destroyed (in order to allow e.g. calling InvalidateDeviceObjects while running) - tex->SetTexID(ImTextureID_Invalid); - tex->SetStatus(ImTextureStatus_Destroyed); - tex->BackendUserData = nullptr; -} - -void ImGui_ImplMetal_UpdateTexture(ImTextureData* tex) -{ - ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); - if (tex->Status == ImTextureStatus_WantCreate) - { - // Create and upload new texture to graphics system - //IMGUI_DEBUG_LOG("UpdateTexture #%03d: WantCreate %dx%d\n", tex->UniqueID, tex->Width, tex->Height); - IM_ASSERT(tex->TexID == ImTextureID_Invalid && tex->BackendUserData == nullptr); - IM_ASSERT(tex->Format == ImTextureFormat_RGBA32); - - // We are retrieving and uploading the font atlas as a 4-channels RGBA texture here. - // In theory we could call GetTexDataAsAlpha8() and upload a 1-channel texture to save on memory access bandwidth. - // However, using a shader designed for 1-channel texture would make it less obvious to use the ImTextureID facility to render users own textures. - // You can make that change in your implementation. - MTLTextureDescriptor* textureDescriptor = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm - width:(NSUInteger)tex->Width - height:(NSUInteger)tex->Height - mipmapped:NO]; - textureDescriptor.usage = MTLTextureUsageShaderRead; - #if TARGET_OS_OSX || TARGET_OS_MACCATALYST - textureDescriptor.storageMode = MTLStorageModeManaged; - #else - textureDescriptor.storageMode = MTLStorageModeShared; - #endif - id <MTLTexture> texture = [bd->SharedMetalContext.device newTextureWithDescriptor:textureDescriptor]; - [texture replaceRegion:MTLRegionMake2D(0, 0, (NSUInteger)tex->Width, (NSUInteger)tex->Height) mipmapLevel:0 withBytes:tex->Pixels bytesPerRow:(NSUInteger)tex->Width * 4]; - MetalTexture* backend_tex = [[MetalTexture alloc] initWithTexture:texture]; - - // Store identifiers - tex->SetTexID((ImTextureID)(intptr_t)texture); - tex->SetStatus(ImTextureStatus_OK); - tex->BackendUserData = (__bridge_retained void*)(backend_tex); - } - else if (tex->Status == ImTextureStatus_WantUpdates) - { - // Update selected blocks. We only ever write to textures regions which have never been used before! - // This backend choose to use tex->Updates[] but you can use tex->UpdateRect to upload a single region. - MetalTexture* backend_tex = (__bridge MetalTexture*)(tex->BackendUserData); - for (ImTextureRect& r : tex->Updates) - { - [backend_tex.metalTexture replaceRegion:MTLRegionMake2D((NSUInteger)r.x, (NSUInteger)r.y, (NSUInteger)r.w, (NSUInteger)r.h) - mipmapLevel:0 - withBytes:tex->GetPixelsAt(r.x, r.y) - bytesPerRow:(NSUInteger)tex->Width * 4]; - } - tex->SetStatus(ImTextureStatus_OK); - } - else if (tex->Status == ImTextureStatus_WantDestroy && tex->UnusedFrames > 0) - { - ImGui_ImplMetal_DestroyTexture(tex); - } -} - -bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device) -{ - ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); - MTLDepthStencilDescriptor* depthStencilDescriptor = [[MTLDepthStencilDescriptor alloc] init]; - depthStencilDescriptor.depthWriteEnabled = NO; - depthStencilDescriptor.depthCompareFunction = MTLCompareFunctionAlways; - bd->SharedMetalContext.depthStencilState = [device newDepthStencilStateWithDescriptor:depthStencilDescriptor]; -#ifdef IMGUI_IMPL_METAL_CPP - [depthStencilDescriptor release]; -#endif - - return true; -} - -void ImGui_ImplMetal_DestroyDeviceObjects() -{ - ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData(); - - // Destroy all textures - for (ImTextureData* tex : ImGui::GetPlatformIO().Textures) - if (tex->RefCount == 1) - ImGui_ImplMetal_DestroyTexture(tex); - - [bd->SharedMetalContext.renderPipelineStateCache removeAllObjects]; -} - -#pragma mark - MetalBuffer implementation - -@implementation MetalBuffer -- (instancetype)initWithBuffer:(id<MTLBuffer>)buffer -{ - if ((self = [super init])) - { - _buffer = buffer; - _lastReuseTime = GetMachAbsoluteTimeInSeconds(); - } - 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 - MetalTexture implementation - -@implementation MetalTexture -- (instancetype)initWithTexture:(id<MTLTexture>)metalTexture -{ - if ((self = [super init])) - self.metalTexture = metalTexture; - return self; -} - -@end - -#pragma mark - MetalContext implementation - -@implementation MetalContext -- (instancetype)init -{ - if ((self = [super init])) - { - self.renderPipelineStateCache = [NSMutableDictionary dictionary]; - self.bufferCache = [NSMutableArray array]; - _lastBufferCachePurge = GetMachAbsoluteTimeInSeconds(); - } - return self; -} - -- (MetalBuffer*)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device -{ - uint64_t now = GetMachAbsoluteTimeInSeconds(); - - @synchronized(self.bufferCache) - { - // 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]; -} - -// Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling. -- (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 = offsetof(ImDrawVert, pos); - vertexDescriptor.attributes[0].format = MTLVertexFormatFloat2; // position - vertexDescriptor.attributes[0].bufferIndex = 0; - vertexDescriptor.attributes[1].offset = offsetof(ImDrawVert, uv); - vertexDescriptor.attributes[1].format = MTLVertexFormatFloat2; // texCoords - vertexDescriptor.attributes[1].bufferIndex = 0; - vertexDescriptor.attributes[2].offset = 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.rasterSampleCount = self.framebufferDescriptor.sampleCount; - pipelineDescriptor.colorAttachments[0].pixelFormat = self.framebufferDescriptor.colorPixelFormat; - pipelineDescriptor.colorAttachments[0].blendingEnabled = YES; - pipelineDescriptor.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd; - pipelineDescriptor.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorSourceAlpha; - pipelineDescriptor.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha; - pipelineDescriptor.colorAttachments[0].alphaBlendOperation = MTLBlendOperationAdd; - pipelineDescriptor.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorOne; - 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; -} - -@end - -//----------------------------------------------------------------------------- - -#endif // #ifndef IMGUI_DISABLE |