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Examples: GLFW+WebGPU: Amends. (#7435, #7132)

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This commit is contained in:
ocornut 2024-04-16 12:08:45 +02:00
parent 80a5fdb108
commit 648278cd62
3 changed files with 43 additions and 44 deletions
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1
docs/CHANGELOG.txt
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@ -50,6 +50,7 @@ Other changes:
mitigitate issues with reading vertex indexing limits with 16-bit indices. (#7496, #5720)
- Backends: SDL3: Fixed text inputs. Re-enable calling SDL_StartTextInput()/SDL_StopTextInput()
as SDL3 no longer enables it by default. (#7452, #6306, #6071, #1953) [@Green-Sky]
- Examples: GLFW+WebGPU: Added support for WebGPU-native/Dawn (#7435, #7132) [@eliasdaler, @Zelif]
-----------------------------------------------------------------------

9
examples/example_emscripten_wgpu/CMakeLists.txt
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@ -1,15 +1,12 @@
# Building for desktop (WebGPU-native) with Dawn:
#
# git clone https://github.com/google/dawn dawn
# cmake -B build -DIMGUI_DAWN_DIR=dawn
# cmake --build build
#
# 1. git clone https://github.com/google/dawn dawn
# 2. cmake -B build -DIMGUI_DAWN_DIR=dawn
# 3. cmake --build build
# The resulting binary will be found at one of the following locations:
# * build/Debug/example_emscripten_wgpu[.exe]
# * build/example_emscripten_wgpu[.exe]
# Building for Emscripten:
#
# 1. Install Emscripten SDK following the instructions: https://emscripten.org/docs/getting_started/downloads.html
# 2. Install Ninja build system
# 3. emcmake cmake -G Ninja -B build

67
examples/example_emscripten_wgpu/main.cpp
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@ -1,7 +1,6 @@
// Dear ImGui: standalone example application for using GLFW + WebGPU
// Dawn is used as a WebGPU implementation on desktop and Emscripten is supported for
// publishing on web.
// (Emscripten is a C++-to-javascript compiler, used to publish executables for the web. See https://emscripten.org/)
// - Emscripten is supported for publishing on web. See https://emscripten.org.
// - Dawn is used as a WebGPU implementation on desktop.
// Learn about Dear ImGui:
// - FAQ https://dearimgui.com/faq
@ -12,7 +11,6 @@
#include "imgui.h"
#include "imgui_impl_glfw.h"
#include "imgui_impl_wgpu.h"
#include <stdio.h>
#ifdef __EMSCRIPTEN__
@ -64,33 +62,6 @@ static void wgpu_error_callback(WGPUErrorType error_type, const char* message, v
printf("%s error: %s\n", error_type_lbl, message);
}
static WGPUAdapter requestAdapter(WGPUInstance instance) {
auto onAdapterRequestEnded = [](WGPURequestAdapterStatus status, WGPUAdapter adapter, char const* message, void* pUserData) {
if (status == WGPURequestAdapterStatus_Success) {
*static_cast<WGPUAdapter*>(pUserData) = adapter;
} else {
printf("Could not get WebGPU adapter: %s\n", message);
}
};
WGPUAdapter adapter;
wgpuInstanceRequestAdapter(instance, nullptr, onAdapterRequestEnded, (void*)&adapter);
return adapter;
}
static WGPUDevice requestDevice(WGPUAdapter& adapter) {
auto onDeviceRequestEnded = [](WGPURequestDeviceStatus status, WGPUDevice device, char const* message, void* pUserData) {
if (status == WGPURequestDeviceStatus_Success) {
*static_cast<WGPUDevice*>(pUserData) = device;
} else {
printf("Could not get WebGPU device: %s\n", message);
}
};
WGPUDevice device;
wgpuAdapterRequestDevice(adapter, nullptr, onDeviceRequestEnded, (void*)&device);
return device;
}
// Main code
int main(int, char**)
{
@ -289,6 +260,36 @@ int main(int, char**)
return 0;
}
#ifndef __EMSCRIPTEN__
static WGPUAdapter RequestAdapter(WGPUInstance instance)
{
auto onAdapterRequestEnded = [](WGPURequestAdapterStatus status, WGPUAdapter adapter, const char* message, void* pUserData)
{
if (status == WGPURequestAdapterStatus_Success)
*(WGPUAdapter*)(pUserData) = adapter;
else
printf("Could not get WebGPU adapter: %s\n", message);
};
WGPUAdapter adapter;
wgpuInstanceRequestAdapter(instance, nullptr, onAdapterRequestEnded, (void*)&adapter);
return adapter;
}
static WGPUDevice RequestDevice(WGPUAdapter& adapter)
{
auto onDeviceRequestEnded = [](WGPURequestDeviceStatus status, WGPUDevice device, const char* message, void* pUserData)
{
if (status == WGPURequestDeviceStatus_Success)
*(WGPUDevice*)(pUserData) = device;
else
printf("Could not get WebGPU device: %s\n", message);
};
WGPUDevice device;
wgpuAdapterRequestDevice(adapter, nullptr, onDeviceRequestEnded, (void*)&device);
return device;
}
#endif
static bool InitWGPU(GLFWwindow* window)
{
wgpu::Instance instance = wgpuCreateInstance(nullptr);
@ -298,10 +299,10 @@ static bool InitWGPU(GLFWwindow* window)
if (!wgpu_device)
return false;
#else
WGPUAdapter adapter = requestAdapter(instance.Get());
WGPUAdapter adapter = RequestAdapter(instance.Get());
if (!adapter)
return false;
wgpu_device = requestDevice(adapter);
wgpu_device = RequestDevice(adapter);
#endif
#ifdef __EMSCRIPTEN__