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#import "Renderer.h"
#import <Metal/Metal.h>
#include "imgui.h"
#include "imgui_impl_metal.h"
#if TARGET_OS_OSX
#include "imgui_impl_osx.h"
#endif
@interface Renderer ()
@property (nonatomic, strong) id <MTLDevice> device;
@property (nonatomic, strong) id <MTLCommandQueue> 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<MTLCommandBuffer> 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 <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
[renderEncoder pushDebugGroup:@"ImGui demo"];
// Start the Dear ImGui frame
ImGui_ImplMetal_NewFrame(renderPassDescriptor);
#if TARGET_OS_OSX
ImGui_ImplOSX_NewFrame(view);
#endif
ImGui::NewFrame();
// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
// 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window.
{
static float f = 0.0f;
static int counter = 0;
ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
ImGui::Checkbox("Another Window", &show_another_window);
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
if (ImGui::Button("Button")) // Buttons return true when clicked (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);
ImGui::End();
}
// 3. Show another simple window.
if (show_another_window)
{
ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
ImGui::End();
}
// Rendering
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
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