Function updateForTextures

docs/tests/v2/es6/js/sanddance.js:29687–29749

(_ref)

// for texture target, get varying type and inject position instruction

function updateForTextures(_ref) {
  var vs = _ref.vs,
      sourceTextureMap = _ref.sourceTextureMap,
      targetTextureVarying = _ref.targetTextureVarying,
      targetTexture = _ref.targetTexture;
  var texAttributeNames = Object.keys(sourceTextureMap);
  var sourceCount = texAttributeNames.length;
  var targetTextureType = null;
  var samplerTextureMap = {};
  var updatedVs = vs;
  var finalInject = {};

  if (sourceCount > 0 || targetTextureVarying) {
    var vsLines = updatedVs.split('\n');
    var updateVsLines = vsLines.slice();
    vsLines.forEach(function (line, index, lines) {
      // TODO add early exit
      if (sourceCount > 0) {
        var updated = processAttributeDefinition(line, sourceTextureMap);

        if (updated) {
          var updatedLine = updated.updatedLine,
              inject = updated.inject;
          updateVsLines[index] = updatedLine; // sampleInstructions.push(sampleInstruction);

          finalInject = (0, _src.combineInjects)([finalInject, inject]);
          Object.assign(samplerTextureMap, updated.samplerTextureMap);
          sourceCount--;
        }
      }

      if (targetTextureVarying && !targetTextureType) {
        targetTextureType = getVaryingType(line, targetTextureVarying);
      }
    });

    if (targetTextureVarying) {
      (0, _assert.default)(targetTexture);
      var sizeName = "".concat(SIZE_UNIFORM_PREFIX).concat(targetTextureVarying);
      var uniformDeclaration = "uniform vec2 ".concat(sizeName, ";\n");
      var posInstructions = "     vec2 ".concat(VS_POS_VARIABLE, " = transform_getPos(").concat(sizeName, ");\n     gl_Position = vec4(").concat(VS_POS_VARIABLE, ", 0, 1.);\n");
      var inject = {
        'vs:#decl': uniformDeclaration,
        'vs:#main-start': posInstructions
      };
      finalInject = (0, _src.combineInjects)([finalInject, inject]);
    }

    updatedVs = updateVsLines.join('\n');
  }

  return {
    // updated vertex shader (commented texture attribute definition)
    vs: updatedVs,
    // type (float, vec2, vec3 of vec4) target texture varying
    targetTextureType: targetTextureType,
    // required vertex and fragment shader injects
    inject: finalInject,