Material.js

var Context = require('./Context');

function Material(program, uniforms) {
  this.gl = Context.currentContext;
  this.program = program;
  this.uniforms = uniforms || {};
  this.prevUniforms = {};
  this.missingUniforms = {};
}

Material.prototype.use = function () {
  this.program.use();
  var numTextures = 0;
  for (var name in this.program.uniforms) {
    if (this.uniforms[name] == null) {
      if (name.indexOf('[') == -1) { //don't warn for arrays
        if (!this.missingUniforms[name]) {
          this.missingUniforms[name] = 0;
        }
        this.missingUniforms[name]++;

        if (this.missingUniforms[name] == 2) {
          console.log('WARN', 'Uniform', name, 'is null');
        }
      }
    }
    else if (this.program.uniforms[name].type == this.gl.SAMPLER_2D || this.program.uniforms[name].type == this.gl.SAMPLER_CUBE) {
      this.gl.activeTexture(this.gl.TEXTURE0 + numTextures);
      if (this.uniforms[name].width > 0 && this.uniforms[name].height > 0) {
        this.gl.bindTexture(this.uniforms[name].target, this.uniforms[name].handle);
        this.program.uniforms[name](numTextures);
      }
      numTextures++;
    }
    else {
      var newValue = this.uniforms[name];
      var oldValue = this.prevUniforms[name];
      var newHash = null;
      if (oldValue !== null) {
        if (newValue && newValue.hash) {
          newHash = newValue.hash();
          if (newHash == oldValue) {
            continue;
          }
        } else if (newValue == oldValue) {
          continue;
        }
      }
      this.program.uniforms[name](this.uniforms[name]);
      this.prevUniforms[name] = newHash ? newHash : newValue;
    }
  }
};

module.exports = Material;