Method prepareProgramMaterial

src/Readback.ts:99–137

(reader: Rgba8Readback)

  // Get a program and THREE.RawShaderMaterial for a given Rgba8Readback,
  // generating it if necessary and caching the result.
  prepareProgramMaterial(reader: Rgba8Readback): {
    program: DynoProgram;
    material: THREE.RawShaderMaterial;
  } {
    let program = Readback.readbackProgram.get(reader);
    if (!program) {
      const graph = dynoBlock(
        { index: "int" },
        { rgba8: "vec4" },
        ({ index }) => {
          reader.inputs.index = index;
          const rgba8 = new OutputRgba8({ rgba8: reader.outputs.rgba8 });
          return { rgba8 };
        },
      );
      if (!Readback.programTemplate) {
        Readback.programTemplate = new DynoProgramTemplate(
          getShaders().computeVec4Template,
        );
      }
      // Create a program from the template and graph
      program = new DynoProgram({
        graph,
        inputs: { index: "_index" },
        outputs: { rgba8: "target" },
        template: Readback.programTemplate,
      });
      Object.assign(program.uniforms, {
        targetLayer: { value: 0 },
        targetBase: { value: 0 },
        targetCount: { value: 0 },
      });
      Readback.readbackProgram.set(reader, program);
    }

    const material = program.prepareMaterial();
    Readback.fullScreenQuad.material = material;
    return { program, material };
  }

  private saveRenderState(renderer: THREE.WebGLRenderer) {
    return {