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// Copyright 2024 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
//
// This file and library_webgpu.js together implement <webgpu/webgpu.h>.
//
#include <webgpu/webgpu.h>
#include <array>
#include <cstdlib>
#include <cassert>
//
// WebGPU function definitions, with methods organized by "class". Note these
// don't need to be extern "C" because they are already declared in webgpu.h.
//
// Standalone (non-method) functions
WGPUInstance wgpuCreateInstance(const WGPUInstanceDescriptor* descriptor) {
assert(descriptor == nullptr); // descriptor not implemented yet
return reinterpret_cast<WGPUInstance>(1);
}
// Instance
void wgpuInstanceReference(WGPUInstance) { /* no-op for now */ }
void wgpuInstanceRelease(WGPUInstance) { /* no-op for now */ }
// WGPUSurface
void wgpuSurfaceGetCapabilities(WGPUSurface surface,
WGPUAdapter adapter,
WGPUSurfaceCapabilities* capabilities) {
assert(capabilities->nextInChain == nullptr); // TODO: Return WGPUStatus_Error
static constexpr std::array<WGPUTextureFormat, 3> kSurfaceFormatsRGBAFirst = {
WGPUTextureFormat_RGBA8Unorm,
WGPUTextureFormat_BGRA8Unorm,
WGPUTextureFormat_RGBA16Float,
};
static constexpr std::array<WGPUTextureFormat, 3> kSurfaceFormatsBGRAFirst = {
WGPUTextureFormat_BGRA8Unorm,
WGPUTextureFormat_RGBA8Unorm,
WGPUTextureFormat_RGBA16Float,
};
WGPUTextureFormat preferredFormat = wgpuSurfaceGetPreferredFormat(surface, adapter);
switch (preferredFormat) {
case WGPUTextureFormat_RGBA8Unorm:
capabilities->formatCount = kSurfaceFormatsRGBAFirst.size();
capabilities->formats = kSurfaceFormatsRGBAFirst.data();
break;
case WGPUTextureFormat_BGRA8Unorm:
capabilities->formatCount = kSurfaceFormatsBGRAFirst.size();
capabilities->formats = kSurfaceFormatsBGRAFirst.data();
break;
default:
assert(false);
}
{
static constexpr WGPUPresentMode kPresentMode = WGPUPresentMode_Fifo;
capabilities->presentModeCount = 1;
capabilities->presentModes = &kPresentMode;
}
{
static constexpr std::array<WGPUCompositeAlphaMode, 2> kAlphaModes = {
WGPUCompositeAlphaMode_Opaque,
WGPUCompositeAlphaMode_Premultiplied,
};
capabilities->alphaModeCount = kAlphaModes.size();
capabilities->alphaModes = kAlphaModes.data();
}
};
// WGPUSurfaceCapabilities
void wgpuSurfaceCapabilitiesFreeMembers(WGPUSurfaceCapabilities value) {
// wgpuSurfaceCapabilities doesn't currently allocate anything.
}
// WGPUAdapterInfo
void wgpuAdapterInfoFreeMembers(WGPUAdapterInfo value) {
free(const_cast<char *>(value.vendor));
free(const_cast<char *>(value.architecture));
free(const_cast<char *>(value.device));
free(const_cast<char *>(value.description));
}
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