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import ComponentDatatype from "../Core/ComponentDatatype.js";
import defined from "../Core/defined.js";
import IndexDatatype from "../Core/IndexDatatype.js";
import Buffer from "../Renderer/Buffer.js";
import BufferUsage from "../Renderer/BufferUsage.js";
import AttributeType from "./AttributeType.js";
import ModelComponents from "./ModelComponents.js";
import PrimitiveOutlineGenerator from "./Model/PrimitiveOutlineGenerator.js";
/**
* Simple struct for tracking whether an attribute will be loaded as a buffer
* or typed array after post-processing.
*
* @alias PrimitiveLoadPlan.AttributeLoadPlan
* @constructor
*
* @param {ModelComponents.Attribute} attribute The attribute to be updated
*
* @private
*/
function AttributeLoadPlan(attribute) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("attribute", attribute);
//>>includeEnd('debug');
/**
* The attribute to track.
*
* @type {ModelComponents.Attribute}
* @readonly
* @private
*/
this.attribute = attribute;
/**
* Whether the attribute will be loaded as a GPU buffer by the time
* {@link PrimitiveLoadPlan#postProcess} is finished.
*
* @type {boolean}
* @private
*/
this.loadBuffer = false;
/**
* Whether the attribute will be loaded as a packed typed array by the time
* {@link PrimitiveLoadPlan#postProcess} is finished.
*
* @type {boolean}
* @private
*/
this.loadTypedArray = false;
}
/**
* Simple struct for tracking whether an index buffer will be loaded as a buffer
* or typed array after post-processing.
*
* @alias PrimitiveLoadPlan.IndicesLoadPlan
* @constructor
*
* @param {ModelComponents.Indices} indices The indices to be updated
*
* @private
*/
function IndicesLoadPlan(indices) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("indices", indices);
//>>includeEnd('debug');
/**
* The indices to track.
*
* @type {ModelComponents.Indices}
* @readonly
* @private
*/
this.indices = indices;
/**
* Whether the indices will be loaded as a GPU buffer by the time
* {@link PrimitiveLoadPlan#postProcess} is finished.
*
* @type {boolean}
* @private
*/
this.loadBuffer = false;
/**
* Whether the indices will be loaded as a typed array copy of the GPU
* buffer by the time {@link PrimitiveLoadPlan#postProcess} is finished.
*
* @type {boolean}
* @private
*/
this.loadTypedArray = false;
}
/**
* Primitives may need post-processing steps after their attributes and indices
* have loaded, such as generating outlines for the CESIUM_primitive_outline glTF
* extension. This object tracks what indices and attributes need to be
* post-processed.
*
* @alias PrimitiveLoadPlan
* @constructor
*
* @param {ModelComponents.Primitive} primitive The primitive to track
*
* @private
*/
function PrimitiveLoadPlan(primitive) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("primitive", primitive);
//>>includeEnd('debug');
/**
* The primitive to track.
*
* @type {ModelComponents.Primitive}
* @readonly
* @private
*/
this.primitive = primitive;
/**
* A flat list of attributes that need to be post-processed. This includes
* both regular attributes and morph target attributes.
*
* @type {PrimitiveLoadPlan.AttributeLoadPlan[]}
* @private
*/
this.attributePlans = [];
/**
* Information about the triangle indices that need to be post-processed,
* if they exist.
*
* @type {PrimitiveLoadPlan.IndicesLoadPlan}
* @private
*/
this.indicesPlan = undefined;
/**
* Set this true to indicate that the primitive has the
* CESIUM_primitive_outline extension and needs to be post-processed
*
* @type {boolean}
* @private
*/
this.needsOutlines = false;
/**
* The outline edge indices from the CESIUM_primitive_outline extension
*
* @type {number[]}
* @private
*/
this.outlineIndices = undefined;
/**
* Set this true to indicate that the primitive has the
* KHR_gaussian_splatting and KHR_gaussian_splatting_compression_spz_2 extension and needs to be post-processed
*
* @type {boolean}
* @private
*/
this.needsGaussianSplats = false;
}
/**
* Apply post-processing steps that may modify geometry such as generating
* outline coordinates. If no post-processing steps are needed, this function
* is a no-op.
*
* @param {Context} context The context for generating buffers on the GPU
*/
PrimitiveLoadPlan.prototype.postProcess = function (context) {
// Handle CESIUM_primitive_outline. This modifies indices and attributes and
// also generates a new attribute for the outline coordinates. These steps
// are synchronous.
if (this.needsOutlines) {
generateOutlines(this);
generateBuffers(this, context);
}
if (this.needsGaussianSplats) {
setupGaussianSplatBuffers(this, context);
}
};
function generateOutlines(loadPlan) {
const primitive = loadPlan.primitive;
const indices = primitive.indices;
const vertexCount = primitive.attributes[0].count;
const generator = new PrimitiveOutlineGenerator({
triangleIndices: indices.typedArray,
outlineIndices: loadPlan.outlineIndices,
originalVertexCount: vertexCount,
});
// The generator modifies/adds indices. In some uncommon cases it may have
// to upgrade to 16- or 32-bit indices so the datatype may change.
indices.typedArray = generator.updatedTriangleIndices;
indices.indexDatatype = IndexDatatype.fromTypedArray(indices.typedArray);
// The outline generator creates a new attribute for the outline coordinates
// that are used with a lookup texture.
const outlineCoordinates = makeOutlineCoordinatesAttribute(
generator.outlineCoordinates,
);
const outlineCoordinatesPlan = new AttributeLoadPlan(outlineCoordinates);
outlineCoordinatesPlan.loadBuffer = true;
outlineCoordinatesPlan.loadTypedArray = false;
loadPlan.attributePlans.push(outlineCoordinatesPlan);
primitive.outlineCoordinates = outlineCoordinatesPlan.attribute;
// Some vertices may be copied due to the addition of the new attribute
// which may have multiple values at a vertex depending on the face
const attributePlans = loadPlan.attributePlans;
const attributesLength = loadPlan.attributePlans.length;
for (let i = 0; i < attributesLength; i++) {
const attribute = attributePlans[i].attribute;
attribute.typedArray = generator.updateAttribute(attribute.typedArray);
}
}
function makeOutlineCoordinatesAttribute(outlineCoordinatesTypedArray) {
const attribute = new ModelComponents.Attribute();
attribute.name = "_OUTLINE_COORDINATES";
attribute.typedArray = outlineCoordinatesTypedArray;
attribute.componentDatatype = ComponentDatatype.FLOAT;
attribute.type = AttributeType.VEC3;
attribute.normalized = false;
attribute.count = outlineCoordinatesTypedArray.length / 3;
return attribute;
}
function setupGaussianSplatBuffers(loadPlan, context) {
const attributePlans = loadPlan.attributePlans;
const attrLen = attributePlans.length;
for (let i = 0; i < attrLen; i++) {
const attributePlan = attributePlans[i];
attributePlan.loadBuffer = false;
attributePlan.loadTypedArray = true;
}
}
function generateBuffers(loadPlan, context) {
generateAttributeBuffers(loadPlan.attributePlans, context);
Eif (defined(loadPlan.indicesPlan)) {
generateIndexBuffers(loadPlan.indicesPlan, context);
}
}
function generateAttributeBuffers(attributePlans, context) {
const attributesLength = attributePlans.length;
for (let i = 0; i < attributesLength; i++) {
const attributePlan = attributePlans[i];
const attribute = attributePlan.attribute;
const typedArray = attribute.typedArray;
if (attributePlan.loadBuffer) {
const buffer = Buffer.createVertexBuffer({
typedArray: typedArray,
context: context,
usage: BufferUsage.STATIC_DRAW,
});
buffer.vertexArrayDestroyable = false;
attribute.buffer = buffer;
}
if (!attributePlan.loadTypedArray) {
attribute.typedArray = undefined;
}
}
}
function generateIndexBuffers(indicesPlan, context) {
const indices = indicesPlan.indices;
if (indicesPlan.loadBuffer) {
const buffer = Buffer.createIndexBuffer({
typedArray: indices.typedArray,
context: context,
usage: BufferUsage.STATIC_DRAW,
indexDatatype: indices.indexDatatype,
});
indices.buffer = buffer;
buffer.vertexArrayDestroyable = false;
}
if (!indicesPlan.loadTypedArray) {
indices.typedArray = undefined;
}
}
PrimitiveLoadPlan.AttributeLoadPlan = AttributeLoadPlan;
PrimitiveLoadPlan.IndicesLoadPlan = IndicesLoadPlan;
export default PrimitiveLoadPlan;
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