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// dear 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; // ImTextureID == void*

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];
}

// 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.
- (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->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(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

generated by cgit v1.2.3 (git 2.25.1) at 2025-09-10 12:05:22 +0000