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// Copyright (C) 2025 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
#if canImport(RealityCoreRenderer, _version: 9999)
import Metal
@_spi(RealityCoreRendererAPI) import RealityCoreRenderer
@_spi(RealityCoreTextureProcessingAPI) import RealityCoreTextureProcessing
class IBLTextures {
static func loadIBLTextures(
resourceContext: _Proto_LowLevelResourceContext_v1,
renderer: _Proto_LowLevelRenderer_v1,
diffuseTextureOriginal: MTLTexture,
specularTextureOriginal: MTLTexture
) throws -> (
diffuse: _Proto_LowLevelTextureResource_v1,
specular: _Proto_LowLevelTextureResource_v1
) {
guard let commandQueue = renderer.device.makeCommandQueue() else {
fatalError("Failed to create command queue")
}
guard let commandBuffer = commandQueue.makeCommandBuffer() else {
fatalError("Failed to create command buffer")
}
let diffuseTextureResource = try resourceContext.makeTextureResource(
descriptor: .init(
textureType: diffuseTextureOriginal.textureType,
pixelFormat: diffuseTextureOriginal.pixelFormat,
width: diffuseTextureOriginal.width,
height: diffuseTextureOriginal.height,
depth: diffuseTextureOriginal.depth,
mipmapLevelCount: diffuseTextureOriginal.mipmapLevelCount,
arrayLength: diffuseTextureOriginal.arrayLength,
textureUsage: .shaderRead,
swizzle: .init(
red: .red,
green: .red,
blue: .red,
alpha: .one
)
)
)
let specularTextureResource = try resourceContext.makeTextureResource(
descriptor: .init(
textureType: specularTextureOriginal.textureType,
pixelFormat: specularTextureOriginal.pixelFormat,
width: specularTextureOriginal.width,
height: specularTextureOriginal.height,
depth: specularTextureOriginal.depth,
mipmapLevelCount: specularTextureOriginal.mipmapLevelCount,
arrayLength: specularTextureOriginal.arrayLength,
textureUsage: .shaderRead,
swizzle: .init(
red: .red,
green: .red,
blue: .red,
alpha: .one
)
)
)
let diffuseTexture = diffuseTextureResource.replace(using: commandBuffer)
let specularTexture = specularTextureResource.replace(using: commandBuffer)
// swift-format-ignore: NeverForceUnwrap
let blitEncoder = commandBuffer.makeBlitCommandEncoder()!
blitEncoder.copy(from: diffuseTextureOriginal, to: diffuseTexture)
blitEncoder.copy(from: specularTextureOriginal, to: specularTexture)
blitEncoder.endEncoding()
commandBuffer.commit()
commandBuffer.waitUntilCompleted()
return (diffuseTextureResource, specularTextureResource)
}
}
#endif
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