@openhps/core
Version:
Open Hybrid Positioning System - Core component
56 lines (54 loc) • 1.89 kB
JavaScript
function WebGLIndexedBufferRenderer(gl, extensions, info) {
let mode;
function setMode(value) {
mode = value;
}
let type, bytesPerElement;
function setIndex(value) {
type = value.type;
bytesPerElement = value.bytesPerElement;
}
function render(start, count) {
gl.drawElements(mode, count, type, start * bytesPerElement);
info.update(count, mode, 1);
}
function renderInstances(start, count, primcount) {
if (primcount === 0) return;
gl.drawElementsInstanced(mode, count, type, start * bytesPerElement, primcount);
info.update(count, mode, primcount);
}
function renderMultiDraw(starts, counts, drawCount) {
if (drawCount === 0) return;
const extension = extensions.get('WEBGL_multi_draw');
extension.multiDrawElementsWEBGL(mode, counts, 0, type, starts, 0, drawCount);
let elementCount = 0;
for (let i = 0; i < drawCount; i++) {
elementCount += counts[i];
}
info.update(elementCount, mode, 1);
}
function renderMultiDrawInstances(starts, counts, drawCount, primcount) {
if (drawCount === 0) return;
const extension = extensions.get('WEBGL_multi_draw');
if (extension === null) {
for (let i = 0; i < starts.length; i++) {
renderInstances(starts[i] / bytesPerElement, counts[i], primcount[i]);
}
} else {
extension.multiDrawElementsInstancedWEBGL(mode, counts, 0, type, starts, 0, primcount, 0, drawCount);
let elementCount = 0;
for (let i = 0; i < drawCount; i++) {
elementCount += counts[i] * primcount[i];
}
info.update(elementCount, mode, 1);
}
}
//
this.setMode = setMode;
this.setIndex = setIndex;
this.render = render;
this.renderInstances = renderInstances;
this.renderMultiDraw = renderMultiDraw;
this.renderMultiDrawInstances = renderMultiDrawInstances;
}
export { WebGLIndexedBufferRenderer };