import EventEmitter from 'eventemitter3';
import { GlProgram } from '../../gl/shader/GlProgram.mjs';
import { BindGroup } from '../../gpu/shader/BindGroup.mjs';
import { GpuProgram } from '../../gpu/shader/GpuProgram.mjs';
import { RendererType } from '../../types.mjs';
import { UniformGroup } from './UniformGroup.mjs';

"use strict";
class Shader extends EventEmitter {
  constructor(options) {
    super();
    /**
     * A record of the uniform groups and resources used by the shader.
     * This is used by WebGL renderer to sync uniform data.
     * @internal
     * @ignore
     */
    this._uniformBindMap = /* @__PURE__ */ Object.create(null);
    this._ownedBindGroups = [];
    let {
      gpuProgram,
      glProgram,
      groups,
      resources,
      compatibleRenderers,
      groupMap
    } = options;
    this.gpuProgram = gpuProgram;
    this.glProgram = glProgram;
    if (compatibleRenderers === void 0) {
      compatibleRenderers = 0;
      if (gpuProgram)
        compatibleRenderers |= RendererType.WEBGPU;
      if (glProgram)
        compatibleRenderers |= RendererType.WEBGL;
    }
    this.compatibleRenderers = compatibleRenderers;
    const nameHash = {};
    if (!resources && !groups) {
      resources = {};
    }
    if (resources && groups) {
      throw new Error("[Shader] Cannot have both resources and groups");
    } else if (!gpuProgram && groups && !groupMap) {
      throw new Error("[Shader] No group map or WebGPU shader provided - consider using resources instead.");
    } else if (!gpuProgram && groups && groupMap) {
      for (const i in groupMap) {
        for (const j in groupMap[i]) {
          const uniformName = groupMap[i][j];
          nameHash[uniformName] = {
            group: i,
            binding: j,
            name: uniformName
          };
        }
      }
    } else if (gpuProgram && groups && !groupMap) {
      const groupData = gpuProgram.structsAndGroups.groups;
      groupMap = {};
      groupData.forEach((data) => {
        groupMap[data.group] = groupMap[data.group] || {};
        groupMap[data.group][data.binding] = data.name;
        nameHash[data.name] = data;
      });
    } else if (resources) {
      groups = {};
      groupMap = {};
      if (gpuProgram) {
        const groupData = gpuProgram.structsAndGroups.groups;
        groupData.forEach((data) => {
          groupMap[data.group] = groupMap[data.group] || {};
          groupMap[data.group][data.binding] = data.name;
          nameHash[data.name] = data;
        });
      }
      let bindTick = 0;
      for (const i in resources) {
        if (nameHash[i])
          continue;
        if (!groups[99]) {
          groups[99] = new BindGroup();
          this._ownedBindGroups.push(groups[99]);
        }
        nameHash[i] = { group: 99, binding: bindTick, name: i };
        groupMap[99] = groupMap[99] || {};
        groupMap[99][bindTick] = i;
        bindTick++;
      }
      for (const i in resources) {
        const name = i;
        let value = resources[i];
        if (!value.source && !value._resourceType) {
          value = new UniformGroup(value);
        }
        const data = nameHash[name];
        if (data) {
          if (!groups[data.group]) {
            groups[data.group] = new BindGroup();
            this._ownedBindGroups.push(groups[data.group]);
          }
          groups[data.group].setResource(value, data.binding);
        }
      }
    }
    this.groups = groups;
    this._uniformBindMap = groupMap;
    this.resources = this._buildResourceAccessor(groups, nameHash);
  }
  /**
   * Sometimes a resource group will be provided later (for example global uniforms)
   * In such cases, this method can be used to let the shader know about the group.
   * @param name - the name of the resource group
   * @param groupIndex - the index of the group (should match the webGPU shader group location)
   * @param bindIndex - the index of the bind point (should match the webGPU shader bind point)
   */
  addResource(name, groupIndex, bindIndex) {
    var _a, _b;
    (_a = this._uniformBindMap)[groupIndex] || (_a[groupIndex] = {});
    (_b = this._uniformBindMap[groupIndex])[bindIndex] || (_b[bindIndex] = name);
    if (!this.groups[groupIndex]) {
      this.groups[groupIndex] = new BindGroup();
      this._ownedBindGroups.push(this.groups[groupIndex]);
    }
  }
  _buildResourceAccessor(groups, nameHash) {
    const uniformsOut = {};
    for (const i in nameHash) {
      const data = nameHash[i];
      Object.defineProperty(uniformsOut, data.name, {
        get() {
          return groups[data.group].getResource(data.binding);
        },
        set(value) {
          groups[data.group].setResource(value, data.binding);
        }
      });
    }
    return uniformsOut;
  }
  /**
   * Use to destroy the shader when its not longer needed.
   * It will destroy the resources and remove listeners.
   * @param destroyPrograms - if the programs should be destroyed as well.
   * Make sure its not being used by other shaders!
   */
  destroy(destroyPrograms = false) {
    this.emit("destroy", this);
    if (destroyPrograms) {
      this.gpuProgram?.destroy();
      this.glProgram?.destroy();
    }
    this.gpuProgram = null;
    this.glProgram = null;
    this.removeAllListeners();
    this._uniformBindMap = null;
    this._ownedBindGroups.forEach((bindGroup) => {
      bindGroup.destroy();
    });
    this._ownedBindGroups = null;
    this.resources = null;
    this.groups = null;
  }
  static from(options) {
    const { gpu, gl, ...rest } = options;
    let gpuProgram;
    let glProgram;
    if (gpu) {
      gpuProgram = GpuProgram.from(gpu);
    }
    if (gl) {
      glProgram = GlProgram.from(gl);
    }
    return new Shader({
      gpuProgram,
      glProgram,
      ...rest
    });
  }
}

export { Shader };
//# sourceMappingURL=Shader.mjs.map