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import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
/**
* An enum describing the built-in vertex attribute semantics.
*
* @enum {string}
*
* @private
*/
const VertexAttributeSemantic = {
/**
* Per-vertex position.
*
* @type {string}
* @constant
*/
POSITION: "POSITION",
/**
* Per-vertex normal.
*
* @type {string}
* @constant
*/
NORMAL: "NORMAL",
/**
* Per-vertex tangent.
*
* @type {string}
* @constant
*/
TANGENT: "TANGENT",
/**
* Per-vertex texture coordinates.
*
* @type {string}
* @constant
*/
TEXCOORD: "TEXCOORD",
/**
* Per-vertex color.
*
* @type {string}
* @constant
*/
COLOR: "COLOR",
/**
* Per-vertex joint IDs for skinning.
*
* @type {string}
* @constant
*/
JOINTS: "JOINTS",
/**
* Per-vertex joint weights for skinning.
*
* @type {string}
* @constant
*/
WEIGHTS: "WEIGHTS",
/**
* Per-vertex feature ID.
*
* @type {string}
* @constant
*/
FEATURE_ID: "_FEATURE_ID",
/**
* Gaussian Splat Scale
*
* @type {string}
* @constant
*/
SCALE: "KHR_gaussian_splatting:SCALE",
/**
* Gaussian Splat Rotation
*
* @type {string}
* @constant
*/
ROTATION: "KHR_gaussian_splatting:ROTATION",
};
function semanticToVariableName(semantic) {
switch (semantic) {
case VertexAttributeSemantic.POSITION:
return "positionMC";
case VertexAttributeSemantic.NORMAL:
return "normalMC";
case VertexAttributeSemantic.TANGENT:
return "tangentMC";
case VertexAttributeSemantic.TEXCOORD:
return "texCoord";
case VertexAttributeSemantic.COLOR:
return "color";
case VertexAttributeSemantic.JOINTS:
return "joints";
case VertexAttributeSemantic.WEIGHTS:
return "weights";
case VertexAttributeSemantic.FEATURE_ID:
return "featureId";
case VertexAttributeSemantic.SCALE:
return "scale";
case VertexAttributeSemantic.ROTATION:
return "rotation";
//>>includeStart('debug', pragmas.debug);
default:
throw new DeveloperError("semantic is not a valid value.");
//>>includeEnd('debug');
}
}
/**
* Returns whether the vertex attribute semantic can have a set index.
*
* @param {VertexAttributeSemantic} semantic The semantic.
*
* @returns {boolean} Whether the semantic can have a set index.
*
* @private
*/
VertexAttributeSemantic.hasSetIndex = function (semantic) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.string("semantic", semantic);
//>>includeEnd('debug');
switch (semantic) {
case VertexAttributeSemantic.POSITION:
case VertexAttributeSemantic.NORMAL:
case VertexAttributeSemantic.TANGENT:
return false;
case VertexAttributeSemantic.TEXCOORD:
case VertexAttributeSemantic.COLOR:
case VertexAttributeSemantic.JOINTS:
case VertexAttributeSemantic.WEIGHTS:
case VertexAttributeSemantic.FEATURE_ID:
case VertexAttributeSemantic.SCALE:
case VertexAttributeSemantic.ROTATION:
return true;
//>>includeStart('debug', pragmas.debug);
default:
throw new DeveloperError("semantic is not a valid value.");
//>>includeEnd('debug');
}
};
/**
* Gets the vertex attribute semantic matching the glTF semantic.
*
* @param {string} gltfSemantic The glTF semantic.
*
* @returns {VertexAttributeSemantic|undefined} The vertex attribute semantic, or undefined if there is no match.
*
* @private
*/
VertexAttributeSemantic.fromGltfSemantic = function (gltfSemantic) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.string("gltfSemantic", gltfSemantic);
//>>includeEnd('debug');
let semantic = gltfSemantic;
// Strip the set index from the semantic
const setIndexRegex = /^(\w+)_\d+$/;
const setIndexMatch = setIndexRegex.exec(gltfSemantic);
if (setIndexMatch !== null) {
semantic = setIndexMatch[1];
}
switch (semantic) {
case "POSITION":
return VertexAttributeSemantic.POSITION;
case "NORMAL":
return VertexAttributeSemantic.NORMAL;
case "TANGENT":
return VertexAttributeSemantic.TANGENT;
case "TEXCOORD":
return VertexAttributeSemantic.TEXCOORD;
case "COLOR":
return VertexAttributeSemantic.COLOR;
case "JOINTS":
return VertexAttributeSemantic.JOINTS;
case "WEIGHTS":
return VertexAttributeSemantic.WEIGHTS;
case "_FEATURE_ID":
return VertexAttributeSemantic.FEATURE_ID;
case "KHR_gaussian_splatting:SCALE":
case "_SCALE":
return VertexAttributeSemantic.SCALE;
case "KHR_gaussian_splatting:ROTATION":
case "_ROTATION":
return VertexAttributeSemantic.ROTATION;
}
return undefined;
};
/**
* Gets the vertex attribute semantic matching the pnts semantic.
*
* @param {string} pntsSemantic The pnts semantic.
*
* @returns {VertexAttributeSemantic|undefined} The vertex attribute semantic, or undefined if there is no match.
*
* @private
*/
VertexAttributeSemantic.fromPntsSemantic = function (pntsSemantic) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.string("pntsSemantic", pntsSemantic);
//>>includeEnd('debug');
switch (pntsSemantic) {
case "POSITION":
case "POSITION_QUANTIZED":
return VertexAttributeSemantic.POSITION;
case "RGBA":
case "RGB":
case "RGB565":
return VertexAttributeSemantic.COLOR;
case "NORMAL":
case "NORMAL_OCT16P":
return VertexAttributeSemantic.NORMAL;
case "BATCH_ID":
return VertexAttributeSemantic.FEATURE_ID;
//>>includeStart('debug', pragmas.debug);
default:
throw new DeveloperError("pntsSemantic is not a valid value.");
//>>includeEnd('debug');
}
};
/**
* Gets the GLSL type (such as <code>vec3</code> or <code>int</code>) for the
* given vertex attribute.
*
* @param {VertexAttributeSemantic} semantic The semantic.
*
* @returns {string} The shader type.
*
* @private
*/
VertexAttributeSemantic.getGlslType = function (semantic) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.string("semantic", semantic);
//>>includeEnd('debug');
switch (semantic) {
case VertexAttributeSemantic.POSITION:
case VertexAttributeSemantic.NORMAL:
case VertexAttributeSemantic.TANGENT:
return "vec3";
case VertexAttributeSemantic.TEXCOORD:
return "vec2";
case VertexAttributeSemantic.COLOR:
return "vec4";
case VertexAttributeSemantic.JOINTS:
return "ivec4";
case VertexAttributeSemantic.WEIGHTS:
return "vec4";
case VertexAttributeSemantic.FEATURE_ID:
return "int";
case VertexAttributeSemantic.SCALE:
return "vec3";
case VertexAttributeSemantic.ROTATION:
return "vec4";
case VertexAttributeSemantic.OPACITY:
return "float";
//>>includeStart('debug', pragmas.debug);
default:
throw new DeveloperError("semantic is not a valid value.");
//>>includeEnd('debug');
}
};
/**
* Gets the variable name for the given semantic and set index.
*
* @param {VertexAttributeSemantic} semantic The semantic.
* @param {number} [setIndex] The set index.
*
* @returns {string} The variable name.
*
* @private
*/
VertexAttributeSemantic.getVariableName = function (semantic, setIndex) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.string("semantic", semantic);
//>>includeEnd('debug');
let variableName = semanticToVariableName(semantic);
if (defined(setIndex)) {
variableName += `_${setIndex}`;
}
return variableName;
};
export default Object.freeze(VertexAttributeSemantic);
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