@pixi/core/lib/shader/ShaderSystem.js

Core PixiJS

"use strict";
var extensions = require("@pixi/extensions");
require("./utils/index.js");
var generateProgram = require("./utils/generateProgram.js"), generateUniformBufferSync = require("./utils/generateUniformBufferSync.js"), unsafeEvalSupported = require("./utils/unsafeEvalSupported.js"), generateUniformsSync = require("./utils/generateUniformsSync.js");
let UID = 0;
const defaultSyncData = { textureCount: 0, uboCount: 0 };
class ShaderSystem {
  /** @param renderer - The renderer this System works for. */
  constructor(renderer) {
    this.destroyed = !1, this.renderer = renderer, this.systemCheck(), this.gl = null, this.shader = null, this.program = null, this.cache = {}, this._uboCache = {}, this.id = UID++;
  }
  /**
   * Overrideable function by `@pixi/unsafe-eval` to silence
   * throwing an error if platform doesn't support unsafe-evals.
   * @private
   */
  systemCheck() {
    if (!unsafeEvalSupported.unsafeEvalSupported())
      throw new Error("Current environment does not allow unsafe-eval, please use @pixi/unsafe-eval module to enable support.");
  }
  contextChange(gl) {
    this.gl = gl, this.reset();
  }
  /**
   * Changes the current shader to the one given in parameter.
   * @param shader - the new shader
   * @param dontSync - false if the shader should automatically sync its uniforms.
   * @returns the glProgram that belongs to the shader.
   */
  bind(shader, dontSync) {
    shader.disposeRunner.add(this), shader.uniforms.globals = this.renderer.globalUniforms;
    const program = shader.program, glProgram = program.glPrograms[this.renderer.CONTEXT_UID] || this.generateProgram(shader);
    return this.shader = shader, this.program !== program && (this.program = program, this.gl.useProgram(glProgram.program)), dontSync || (defaultSyncData.textureCount = 0, defaultSyncData.uboCount = 0, this.syncUniformGroup(shader.uniformGroup, defaultSyncData)), glProgram;
  }
  /**
   * Uploads the uniforms values to the currently bound shader.
   * @param uniforms - the uniforms values that be applied to the current shader
   */
  setUniforms(uniforms) {
    const shader = this.shader.program, glProgram = shader.glPrograms[this.renderer.CONTEXT_UID];
    shader.syncUniforms(glProgram.uniformData, uniforms, this.renderer);
  }
  /* eslint-disable @typescript-eslint/explicit-module-boundary-types */
  /**
   * Syncs uniforms on the group
   * @param group - the uniform group to sync
   * @param syncData - this is data that is passed to the sync function and any nested sync functions
   */
  syncUniformGroup(group, syncData) {
    const glProgram = this.getGlProgram();
    (!group.static || group.dirtyId !== glProgram.uniformDirtyGroups[group.id]) && (glProgram.uniformDirtyGroups[group.id] = group.dirtyId, this.syncUniforms(group, glProgram, syncData));
  }
  /**
   * Overrideable by the @pixi/unsafe-eval package to use static syncUniforms instead.
   * @param group
   * @param glProgram
   * @param syncData
   */
  syncUniforms(group, glProgram, syncData) {
    (group.syncUniforms[this.shader.program.id] || this.createSyncGroups(group))(glProgram.uniformData, group.uniforms, this.renderer, syncData);
  }
  createSyncGroups(group) {
    const id = this.getSignature(group, this.shader.program.uniformData, "u");
    return this.cache[id] || (this.cache[id] = generateUniformsSync.generateUniformsSync(group, this.shader.program.uniformData)), group.syncUniforms[this.shader.program.id] = this.cache[id], group.syncUniforms[this.shader.program.id];
  }
  /**
   * Syncs uniform buffers
   * @param group - the uniform buffer group to sync
   * @param name - the name of the uniform buffer
   */
  syncUniformBufferGroup(group, name) {
    const glProgram = this.getGlProgram();
    if (!group.static || group.dirtyId !== 0 || !glProgram.uniformGroups[group.id]) {
      group.dirtyId = 0;
      const syncFunc = glProgram.uniformGroups[group.id] || this.createSyncBufferGroup(group, glProgram, name);
      group.buffer.update(), syncFunc(
        glProgram.uniformData,
        group.uniforms,
        this.renderer,
        defaultSyncData,
        group.buffer
      );
    }
    this.renderer.buffer.bindBufferBase(group.buffer, glProgram.uniformBufferBindings[name]);
  }
  /**
   * Will create a function that uploads a uniform buffer using the STD140 standard.
   * The upload function will then be cached for future calls
   * If a group is manually managed, then a simple upload function is generated
   * @param group - the uniform buffer group to sync
   * @param glProgram - the gl program to attach the uniform bindings to
   * @param name - the name of the uniform buffer (must exist on the shader)
   */
  createSyncBufferGroup(group, glProgram, name) {
    const { gl } = this.renderer;
    this.renderer.buffer.bind(group.buffer);
    const uniformBlockIndex = this.gl.getUniformBlockIndex(glProgram.program, name);
    glProgram.uniformBufferBindings[name] = this.shader.uniformBindCount, gl.uniformBlockBinding(glProgram.program, uniformBlockIndex, this.shader.uniformBindCount), this.shader.uniformBindCount++;
    const id = this.getSignature(group, this.shader.program.uniformData, "ubo");
    let uboData = this._uboCache[id];
    if (uboData || (uboData = this._uboCache[id] = generateUniformBufferSync.generateUniformBufferSync(group, this.shader.program.uniformData)), group.autoManage) {
      const data = new Float32Array(uboData.size / 4);
      group.buffer.update(data);
    }
    return glProgram.uniformGroups[group.id] = uboData.syncFunc, glProgram.uniformGroups[group.id];
  }
  /**
   * Takes a uniform group and data and generates a unique signature for them.
   * @param group - The uniform group to get signature of
   * @param group.uniforms
   * @param uniformData - Uniform information generated by the shader
   * @param preFix
   * @returns Unique signature of the uniform group
   */
  getSignature(group, uniformData, preFix) {
    const uniforms = group.uniforms, strings = [`${preFix}-`];
    for (const i in uniforms)
      strings.push(i), uniformData[i] && strings.push(uniformData[i].type);
    return strings.join("-");
  }
  /**
   * Returns the underlying GLShade rof the currently bound shader.
   *
   * This can be handy for when you to have a little more control over the setting of your uniforms.
   * @returns The glProgram for the currently bound Shader for this context
   */
  getGlProgram() {
    return this.shader ? this.shader.program.glPrograms[this.renderer.CONTEXT_UID] : null;
  }
  /**
   * Generates a glProgram version of the Shader provided.
   * @param shader - The shader that the glProgram will be based on.
   * @returns A shiny new glProgram!
   */
  generateProgram(shader) {
    const gl = this.gl, program = shader.program, glProgram = generateProgram.generateProgram(gl, program);
    return program.glPrograms[this.renderer.CONTEXT_UID] = glProgram, glProgram;
  }
  /** Resets ShaderSystem state, does not affect WebGL state. */
  reset() {
    this.program = null, this.shader = null;
  }
  /**
   * Disposes shader.
   * If disposing one equals with current shader, set current as null.
   * @param shader - Shader object
   */
  disposeShader(shader) {
    this.shader === shader && (this.shader = null);
  }
  /** Destroys this System and removes all its textures. */
  destroy() {
    this.renderer = null, this.destroyed = !0;
  }
}
ShaderSystem.extension = {
  type: extensions.ExtensionType.RendererSystem,
  name: "shader"
};
extensions.extensions.add(ShaderSystem);
exports.ShaderSystem = ShaderSystem;
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