@openhps/core
Version:
Open Hybrid Positioning System - Core component
328 lines (321 loc) • 12.8 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.WebGLBindingStates = WebGLBindingStates;
var _constants = require("../../constants.js");
function WebGLBindingStates(gl, attributes) {
const maxVertexAttributes = gl.getParameter(gl.MAX_VERTEX_ATTRIBS);
const bindingStates = {};
const defaultState = createBindingState(null);
let currentState = defaultState;
let forceUpdate = false;
function setup(object, material, program, geometry, index) {
let updateBuffers = false;
const state = getBindingState(geometry, program, material);
if (currentState !== state) {
currentState = state;
bindVertexArrayObject(currentState.object);
}
updateBuffers = needsUpdate(object, geometry, program, index);
if (updateBuffers) saveCache(object, geometry, program, index);
if (index !== null) {
attributes.update(index, gl.ELEMENT_ARRAY_BUFFER);
}
if (updateBuffers || forceUpdate) {
forceUpdate = false;
setupVertexAttributes(object, material, program, geometry);
if (index !== null) {
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, attributes.get(index).buffer);
}
}
}
function createVertexArrayObject() {
return gl.createVertexArray();
}
function bindVertexArrayObject(vao) {
return gl.bindVertexArray(vao);
}
function deleteVertexArrayObject(vao) {
return gl.deleteVertexArray(vao);
}
function getBindingState(geometry, program, material) {
const wireframe = material.wireframe === true;
let programMap = bindingStates[geometry.id];
if (programMap === undefined) {
programMap = {};
bindingStates[geometry.id] = programMap;
}
let stateMap = programMap[program.id];
if (stateMap === undefined) {
stateMap = {};
programMap[program.id] = stateMap;
}
let state = stateMap[wireframe];
if (state === undefined) {
state = createBindingState(createVertexArrayObject());
stateMap[wireframe] = state;
}
return state;
}
function createBindingState(vao) {
const newAttributes = [];
const enabledAttributes = [];
const attributeDivisors = [];
for (let i = 0; i < maxVertexAttributes; i++) {
newAttributes[i] = 0;
enabledAttributes[i] = 0;
attributeDivisors[i] = 0;
}
return {
// for backward compatibility on non-VAO support browser
geometry: null,
program: null,
wireframe: false,
newAttributes: newAttributes,
enabledAttributes: enabledAttributes,
attributeDivisors: attributeDivisors,
object: vao,
attributes: {},
index: null
};
}
function needsUpdate(object, geometry, program, index) {
const cachedAttributes = currentState.attributes;
const geometryAttributes = geometry.attributes;
let attributesNum = 0;
const programAttributes = program.getAttributes();
for (const name in programAttributes) {
const programAttribute = programAttributes[name];
if (programAttribute.location >= 0) {
const cachedAttribute = cachedAttributes[name];
let geometryAttribute = geometryAttributes[name];
if (geometryAttribute === undefined) {
if (name === 'instanceMatrix' && object.instanceMatrix) geometryAttribute = object.instanceMatrix;
if (name === 'instanceColor' && object.instanceColor) geometryAttribute = object.instanceColor;
}
if (cachedAttribute === undefined) return true;
if (cachedAttribute.attribute !== geometryAttribute) return true;
if (geometryAttribute && cachedAttribute.data !== geometryAttribute.data) return true;
attributesNum++;
}
}
if (currentState.attributesNum !== attributesNum) return true;
if (currentState.index !== index) return true;
return false;
}
function saveCache(object, geometry, program, index) {
const cache = {};
const attributes = geometry.attributes;
let attributesNum = 0;
const programAttributes = program.getAttributes();
for (const name in programAttributes) {
const programAttribute = programAttributes[name];
if (programAttribute.location >= 0) {
let attribute = attributes[name];
if (attribute === undefined) {
if (name === 'instanceMatrix' && object.instanceMatrix) attribute = object.instanceMatrix;
if (name === 'instanceColor' && object.instanceColor) attribute = object.instanceColor;
}
const data = {};
data.attribute = attribute;
if (attribute && attribute.data) {
data.data = attribute.data;
}
cache[name] = data;
attributesNum++;
}
}
currentState.attributes = cache;
currentState.attributesNum = attributesNum;
currentState.index = index;
}
function initAttributes() {
const newAttributes = currentState.newAttributes;
for (let i = 0, il = newAttributes.length; i < il; i++) {
newAttributes[i] = 0;
}
}
function enableAttribute(attribute) {
enableAttributeAndDivisor(attribute, 0);
}
function enableAttributeAndDivisor(attribute, meshPerAttribute) {
const newAttributes = currentState.newAttributes;
const enabledAttributes = currentState.enabledAttributes;
const attributeDivisors = currentState.attributeDivisors;
newAttributes[attribute] = 1;
if (enabledAttributes[attribute] === 0) {
gl.enableVertexAttribArray(attribute);
enabledAttributes[attribute] = 1;
}
if (attributeDivisors[attribute] !== meshPerAttribute) {
gl.vertexAttribDivisor(attribute, meshPerAttribute);
attributeDivisors[attribute] = meshPerAttribute;
}
}
function disableUnusedAttributes() {
const newAttributes = currentState.newAttributes;
const enabledAttributes = currentState.enabledAttributes;
for (let i = 0, il = enabledAttributes.length; i < il; i++) {
if (enabledAttributes[i] !== newAttributes[i]) {
gl.disableVertexAttribArray(i);
enabledAttributes[i] = 0;
}
}
}
function vertexAttribPointer(index, size, type, normalized, stride, offset, integer) {
if (integer === true) {
gl.vertexAttribIPointer(index, size, type, stride, offset);
} else {
gl.vertexAttribPointer(index, size, type, normalized, stride, offset);
}
}
function setupVertexAttributes(object, material, program, geometry) {
initAttributes();
const geometryAttributes = geometry.attributes;
const programAttributes = program.getAttributes();
const materialDefaultAttributeValues = material.defaultAttributeValues;
for (const name in programAttributes) {
const programAttribute = programAttributes[name];
if (programAttribute.location >= 0) {
let geometryAttribute = geometryAttributes[name];
if (geometryAttribute === undefined) {
if (name === 'instanceMatrix' && object.instanceMatrix) geometryAttribute = object.instanceMatrix;
if (name === 'instanceColor' && object.instanceColor) geometryAttribute = object.instanceColor;
}
if (geometryAttribute !== undefined) {
const normalized = geometryAttribute.normalized;
const size = geometryAttribute.itemSize;
const attribute = attributes.get(geometryAttribute);
// TODO Attribute may not be available on context restore
if (attribute === undefined) continue;
const buffer = attribute.buffer;
const type = attribute.type;
const bytesPerElement = attribute.bytesPerElement;
// check for integer attributes
const integer = type === gl.INT || type === gl.UNSIGNED_INT || geometryAttribute.gpuType === _constants.IntType;
if (geometryAttribute.isInterleavedBufferAttribute) {
const data = geometryAttribute.data;
const stride = data.stride;
const offset = geometryAttribute.offset;
if (data.isInstancedInterleavedBuffer) {
for (let i = 0; i < programAttribute.locationSize; i++) {
enableAttributeAndDivisor(programAttribute.location + i, data.meshPerAttribute);
}
if (object.isInstancedMesh !== true && geometry._maxInstanceCount === undefined) {
geometry._maxInstanceCount = data.meshPerAttribute * data.count;
}
} else {
for (let i = 0; i < programAttribute.locationSize; i++) {
enableAttribute(programAttribute.location + i);
}
}
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
for (let i = 0; i < programAttribute.locationSize; i++) {
vertexAttribPointer(programAttribute.location + i, size / programAttribute.locationSize, type, normalized, stride * bytesPerElement, (offset + size / programAttribute.locationSize * i) * bytesPerElement, integer);
}
} else {
if (geometryAttribute.isInstancedBufferAttribute) {
for (let i = 0; i < programAttribute.locationSize; i++) {
enableAttributeAndDivisor(programAttribute.location + i, geometryAttribute.meshPerAttribute);
}
if (object.isInstancedMesh !== true && geometry._maxInstanceCount === undefined) {
geometry._maxInstanceCount = geometryAttribute.meshPerAttribute * geometryAttribute.count;
}
} else {
for (let i = 0; i < programAttribute.locationSize; i++) {
enableAttribute(programAttribute.location + i);
}
}
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
for (let i = 0; i < programAttribute.locationSize; i++) {
vertexAttribPointer(programAttribute.location + i, size / programAttribute.locationSize, type, normalized, size * bytesPerElement, size / programAttribute.locationSize * i * bytesPerElement, integer);
}
}
} else if (materialDefaultAttributeValues !== undefined) {
const value = materialDefaultAttributeValues[name];
if (value !== undefined) {
switch (value.length) {
case 2:
gl.vertexAttrib2fv(programAttribute.location, value);
break;
case 3:
gl.vertexAttrib3fv(programAttribute.location, value);
break;
case 4:
gl.vertexAttrib4fv(programAttribute.location, value);
break;
default:
gl.vertexAttrib1fv(programAttribute.location, value);
}
}
}
}
}
disableUnusedAttributes();
}
function dispose() {
reset();
for (const geometryId in bindingStates) {
const programMap = bindingStates[geometryId];
for (const programId in programMap) {
const stateMap = programMap[programId];
for (const wireframe in stateMap) {
deleteVertexArrayObject(stateMap[wireframe].object);
delete stateMap[wireframe];
}
delete programMap[programId];
}
delete bindingStates[geometryId];
}
}
function releaseStatesOfGeometry(geometry) {
if (bindingStates[geometry.id] === undefined) return;
const programMap = bindingStates[geometry.id];
for (const programId in programMap) {
const stateMap = programMap[programId];
for (const wireframe in stateMap) {
deleteVertexArrayObject(stateMap[wireframe].object);
delete stateMap[wireframe];
}
delete programMap[programId];
}
delete bindingStates[geometry.id];
}
function releaseStatesOfProgram(program) {
for (const geometryId in bindingStates) {
const programMap = bindingStates[geometryId];
if (programMap[program.id] === undefined) continue;
const stateMap = programMap[program.id];
for (const wireframe in stateMap) {
deleteVertexArrayObject(stateMap[wireframe].object);
delete stateMap[wireframe];
}
delete programMap[program.id];
}
}
function reset() {
resetDefaultState();
forceUpdate = true;
if (currentState === defaultState) return;
currentState = defaultState;
bindVertexArrayObject(currentState.object);
}
// for backward-compatibility
function resetDefaultState() {
defaultState.geometry = null;
defaultState.program = null;
defaultState.wireframe = false;
}
return {
setup: setup,
reset: reset,
resetDefaultState: resetDefaultState,
dispose: dispose,
releaseStatesOfGeometry: releaseStatesOfGeometry,
releaseStatesOfProgram: releaseStatesOfProgram,
initAttributes: initAttributes,
enableAttribute: enableAttribute,
disableUnusedAttributes: disableUnusedAttributes
};
}