import { __decorate } from "../tslib.es6.js";
import { serialize } from "../Misc/decorators.js";
import { SerializationHelper } from "../Misc/decorators.serialization.js";
import { RegisterClass } from "../Misc/typeStore.js";
import { ComputeBindingType } from "../Engines/Extensions/engine.computeShader.js";
import { Texture } from "../Materials/Textures/texture.js";
import { UniqueIdGenerator } from "../Misc/uniqueIdGenerator.js";
import { Logger } from "../Misc/logger.js";
import { TextureSampler } from "../Materials/Textures/textureSampler.js";
import { WebGPUPerfCounter } from "../Engines/WebGPU/webgpuPerfCounter.js";
/**
 * The ComputeShader object lets you execute a compute shader on your GPU (if supported by the engine)
 */
export class ComputeShader {
    /**
     * The options used to create the shader
     */
    get options() {
        return this._options;
    }
    /**
     * The shaderPath used to create the shader
     */
    get shaderPath() {
        return this._shaderPath;
    }
    /**
     * Instantiates a new compute shader.
     * @param name Defines the name of the compute shader in the scene
     * @param engine Defines the engine the compute shader belongs to
     * @param shaderPath Defines the route to the shader code in one of three ways:
     *  * object: \{ compute: "custom" \}, used with ShaderStore.ShadersStoreWGSL["customComputeShader"]
     *  * object: \{ computeElement: "HTMLElementId" \}, used with shader code in script tags
     *  * object: \{ computeSource: "compute shader code string" \}, where the string contains the shader code
     *  * string: try first to find the code in ShaderStore.ShadersStoreWGSL[shaderPath + "ComputeShader"]. If not, assumes it is a file with name shaderPath.compute.fx in index.html folder.
     * @param options Define the options used to create the shader
     */
    constructor(name, engine, shaderPath, options = {}) {
        this._bindings = {};
        this._samplers = {};
        this._contextIsDirty = false;
        /**
         * When set to true, dispatch won't call isReady anymore and won't check if the underlying GPU resources should be (re)created because of a change in the inputs (texture, uniform buffer, etc.)
         * If you know that your inputs did not change since last time dispatch was called and that isReady() returns true, set this flag to true to improve performance
         */
        this.fastMode = false;
        /**
         * Callback triggered when the shader is compiled
         */
        this.onCompiled = null;
        /**
         * Callback triggered when an error occurs
         */
        this.onError = null;
        this.name = name;
        this._engine = engine;
        this.uniqueId = UniqueIdGenerator.UniqueId;
        if (engine.enableGPUTimingMeasurements) {
            this.gpuTimeInFrame = new WebGPUPerfCounter();
        }
        if (!this._engine.getCaps().supportComputeShaders) {
            Logger.Error("This engine does not support compute shaders!");
            return;
        }
        if (!options.bindingsMapping) {
            Logger.Error("You must provide the binding mappings as browsers don't support reflection for wgsl shaders yet!");
            return;
        }
        this._context = engine.createComputeContext();
        this._shaderPath = shaderPath;
        this._options = {
            bindingsMapping: {},
            defines: [],
            ...options,
        };
    }
    /**
     * Gets the current class name of the material e.g. "ComputeShader"
     * Mainly use in serialization.
     * @returns the class name
     */
    getClassName() {
        return "ComputeShader";
    }
    /**
     * Binds a texture to the shader
     * @param name Binding name of the texture
     * @param texture Texture to bind
     * @param bindSampler Bind the sampler corresponding to the texture (default: true). The sampler will be bound just before the binding index of the texture
     */
    setTexture(name, texture, bindSampler = true) {
        const current = this._bindings[name];
        this._bindings[name] = {
            type: bindSampler ? ComputeBindingType.Texture : ComputeBindingType.TextureWithoutSampler,
            object: texture,
            indexInGroupEntries: current?.indexInGroupEntries,
        };
        this._contextIsDirty || (this._contextIsDirty = !current || current.object !== texture || current.type !== this._bindings[name].type);
    }
    /**
     * Binds a storage texture to the shader
     * @param name Binding name of the texture
     * @param texture Texture to bind
     */
    setStorageTexture(name, texture) {
        const current = this._bindings[name];
        this._contextIsDirty || (this._contextIsDirty = !current || current.object !== texture);
        this._bindings[name] = {
            type: ComputeBindingType.StorageTexture,
            object: texture,
            indexInGroupEntries: current?.indexInGroupEntries,
        };
    }
    /**
     * Binds an external texture to the shader
     * @param name Binding name of the texture
     * @param texture Texture to bind
     */
    setExternalTexture(name, texture) {
        const current = this._bindings[name];
        this._contextIsDirty || (this._contextIsDirty = !current || current.object !== texture);
        this._bindings[name] = {
            type: ComputeBindingType.ExternalTexture,
            object: texture,
            indexInGroupEntries: current?.indexInGroupEntries,
        };
    }
    /**
     * Binds a video texture to the shader (by binding the external texture attached to this video)
     * @param name Binding name of the texture
     * @param texture Texture to bind
     * @returns true if the video texture was successfully bound, else false. false will be returned if the current engine does not support external textures
     */
    setVideoTexture(name, texture) {
        if (texture.externalTexture) {
            this.setExternalTexture(name, texture.externalTexture);
            return true;
        }
        return false;
    }
    /**
     * Binds a uniform buffer to the shader
     * @param name Binding name of the buffer
     * @param buffer Buffer to bind
     */
    setUniformBuffer(name, buffer) {
        const current = this._bindings[name];
        this._contextIsDirty || (this._contextIsDirty = !current || current.object !== buffer);
        this._bindings[name] = {
            type: ComputeShader._BufferIsDataBuffer(buffer) ? ComputeBindingType.DataBuffer : ComputeBindingType.UniformBuffer,
            object: buffer,
            indexInGroupEntries: current?.indexInGroupEntries,
        };
    }
    /**
     * Binds a storage buffer to the shader
     * @param name Binding name of the buffer
     * @param buffer Buffer to bind
     */
    setStorageBuffer(name, buffer) {
        const current = this._bindings[name];
        this._contextIsDirty || (this._contextIsDirty = !current || current.object !== buffer);
        this._bindings[name] = {
            type: ComputeShader._BufferIsDataBuffer(buffer) ? ComputeBindingType.DataBuffer : ComputeBindingType.StorageBuffer,
            object: buffer,
            indexInGroupEntries: current?.indexInGroupEntries,
        };
    }
    /**
     * Binds a texture sampler to the shader
     * @param name Binding name of the sampler
     * @param sampler Sampler to bind
     */
    setTextureSampler(name, sampler) {
        const current = this._bindings[name];
        this._contextIsDirty || (this._contextIsDirty = !current || !sampler.compareSampler(current.object));
        this._bindings[name] = {
            type: ComputeBindingType.Sampler,
            object: sampler,
            indexInGroupEntries: current?.indexInGroupEntries,
        };
    }
    /**
     * Specifies that the compute shader is ready to be executed (the compute effect and all the resources are ready)
     * @returns true if the compute shader is ready to be executed
     */
    isReady() {
        let effect = this._effect;
        for (const key in this._bindings) {
            const binding = this._bindings[key], type = binding.type, object = binding.object;
            switch (type) {
                case ComputeBindingType.Texture:
                case ComputeBindingType.TextureWithoutSampler:
                case ComputeBindingType.StorageTexture: {
                    const texture = object;
                    if (!texture.isReady()) {
                        return false;
                    }
                    break;
                }
                case ComputeBindingType.ExternalTexture: {
                    const texture = object;
                    if (!texture.isReady()) {
                        return false;
                    }
                    break;
                }
            }
        }
        const defines = [];
        const shaderName = this._shaderPath;
        if (this._options.defines) {
            for (let index = 0; index < this._options.defines.length; index++) {
                defines.push(this._options.defines[index]);
            }
        }
        const join = defines.join("\n");
        if (this._cachedDefines !== join) {
            this._cachedDefines = join;
            effect = this._engine.createComputeEffect(shaderName, {
                defines: join,
                entryPoint: this._options.entryPoint,
                onCompiled: this.onCompiled,
                onError: this.onError,
            });
            this._effect = effect;
        }
        if (!effect.isReady()) {
            return false;
        }
        return true;
    }
    /**
     * Dispatches (executes) the compute shader
     * @param x Number of workgroups to execute on the X dimension
     * @param y Number of workgroups to execute on the Y dimension (default: 1)
     * @param z Number of workgroups to execute on the Z dimension (default: 1)
     * @returns True if the dispatch could be done, else false (meaning either the compute effect or at least one of the bound resources was not ready)
     */
    dispatch(x, y, z) {
        if (!this.fastMode && !this._checkContext()) {
            return false;
        }
        this._engine.computeDispatch(this._effect, this._context, this._bindings, x, y, z, this._options.bindingsMapping, this.gpuTimeInFrame);
        return true;
    }
    /**
     * Dispatches (executes) the compute shader.
     * @param buffer Buffer containing the number of workgroups to execute on the X, Y and Z dimensions
     * @param offset Offset in the buffer where the workgroup counts are stored (default: 0)
     * @returns True if the dispatch could be done, else false (meaning either the compute effect or at least one of the bound resources was not ready)
     */
    dispatchIndirect(buffer, offset = 0) {
        if (!this.fastMode && !this._checkContext()) {
            return false;
        }
        const dataBuffer = ComputeShader._BufferIsDataBuffer(buffer) ? buffer : buffer.getBuffer();
        this._engine.computeDispatchIndirect(this._effect, this._context, this._bindings, dataBuffer, offset, this._options.bindingsMapping, this.gpuTimeInFrame);
        return true;
    }
    _checkContext() {
        if (!this.isReady()) {
            return false;
        }
        // If the sampling parameters of a texture bound to the shader have changed, we must clear the compute context so that it is recreated with the updated values
        // Also, if the actual (gpu) buffer used by a uniform buffer has changed, we must clear the compute context so that it is recreated with the updated value
        for (const key in this._bindings) {
            const binding = this._bindings[key];
            if (!this._options.bindingsMapping[key]) {
                throw new Error("ComputeShader ('" + this.name + "'): No binding mapping has been provided for the property '" + key + "'");
            }
            switch (binding.type) {
                case ComputeBindingType.Texture: {
                    const sampler = this._samplers[key];
                    const texture = binding.object;
                    if (!sampler || !texture._texture || !sampler.compareSampler(texture._texture)) {
                        this._samplers[key] = new TextureSampler().setParameters(texture.wrapU, texture.wrapV, texture.wrapR, texture.anisotropicFilteringLevel, texture._texture.samplingMode, texture._texture?._comparisonFunction);
                        this._contextIsDirty = true;
                    }
                    break;
                }
                case ComputeBindingType.ExternalTexture: {
                    // we must recreate the bind groups each time if there's an external texture, because device.importExternalTexture must be called each frame
                    this._contextIsDirty = true;
                    break;
                }
                case ComputeBindingType.UniformBuffer: {
                    const ubo = binding.object;
                    if (ubo.getBuffer() !== binding.buffer) {
                        binding.buffer = ubo.getBuffer();
                        this._contextIsDirty = true;
                    }
                    break;
                }
            }
        }
        if (this._contextIsDirty) {
            this._contextIsDirty = false;
            this._context.clear();
        }
        return true;
    }
    /**
     * Waits for the compute shader to be ready and executes it
     * @param x Number of workgroups to execute on the X dimension
     * @param y Number of workgroups to execute on the Y dimension (default: 1)
     * @param z Number of workgroups to execute on the Z dimension (default: 1)
     * @param delay Delay between the retries while the shader is not ready (in milliseconds - 10 by default)
     * @returns A promise that is resolved once the shader has been sent to the GPU. Note that it does not mean that the shader execution itself is finished!
     */
    dispatchWhenReady(x, y, z, delay = 10) {
        return new Promise((resolve) => {
            const check = () => {
                if (!this.dispatch(x, y, z)) {
                    setTimeout(check, delay);
                }
                else {
                    resolve();
                }
            };
            check();
        });
    }
    /**
     * Serializes this compute shader in a JSON representation
     * @returns the serialized compute shader object
     */
    serialize() {
        const serializationObject = SerializationHelper.Serialize(this);
        serializationObject.options = this._options;
        serializationObject.shaderPath = this._shaderPath;
        serializationObject.bindings = {};
        serializationObject.textures = {};
        for (const key in this._bindings) {
            const binding = this._bindings[key];
            const object = binding.object;
            switch (binding.type) {
                case ComputeBindingType.Texture:
                case ComputeBindingType.TextureWithoutSampler:
                case ComputeBindingType.StorageTexture: {
                    const serializedData = object.serialize();
                    if (serializedData) {
                        serializationObject.textures[key] = serializedData;
                        serializationObject.bindings[key] = {
                            type: binding.type,
                        };
                    }
                    break;
                }
                case ComputeBindingType.UniformBuffer: {
                    break;
                }
            }
        }
        return serializationObject;
    }
    /**
     * Creates a compute shader from parsed compute shader data
     * @param source defines the JSON representation of the compute shader
     * @param scene defines the hosting scene
     * @param rootUrl defines the root URL to use to load textures and relative dependencies
     * @returns a new compute shader
     */
    static Parse(source, scene, rootUrl) {
        const compute = SerializationHelper.Parse(() => new ComputeShader(source.name, scene.getEngine(), source.shaderPath, source.options), source, scene, rootUrl);
        for (const key in source.textures) {
            const binding = source.bindings[key];
            const texture = Texture.Parse(source.textures[key], scene, rootUrl);
            if (binding.type === ComputeBindingType.Texture) {
                compute.setTexture(key, texture);
            }
            else if (binding.type === ComputeBindingType.TextureWithoutSampler) {
                compute.setTexture(key, texture, false);
            }
            else {
                compute.setStorageTexture(key, texture);
            }
        }
        return compute;
    }
    static _BufferIsDataBuffer(buffer) {
        return buffer.underlyingResource !== undefined;
    }
}
__decorate([
    serialize()
], ComputeShader.prototype, "name", void 0);
__decorate([
    serialize()
], ComputeShader.prototype, "fastMode", void 0);
RegisterClass("BABYLON.ComputeShader", ComputeShader);
//# sourceMappingURL=computeShader.js.map