@openhps/core
Version:
Open Hybrid Positioning System - Core component
99 lines (98 loc) • 2.58 kB
JavaScript
class WebGLBufferRenderer {
constructor(backend) {
this.gl = backend.gl;
this.extensions = backend.extensions;
this.info = backend.renderer.info;
this.mode = null;
this.index = 0;
this.type = null;
this.object = null;
}
render(start, count) {
const {
gl,
mode,
object,
type,
info,
index
} = this;
if (index !== 0) {
gl.drawElements(mode, count, type, start);
} else {
gl.drawArrays(mode, start, count);
}
info.update(object, count, 1);
}
renderInstances(start, count, primcount) {
const {
gl,
mode,
type,
index,
object,
info
} = this;
if (primcount === 0) return;
if (index !== 0) {
gl.drawElementsInstanced(mode, count, type, start, primcount);
} else {
gl.drawArraysInstanced(mode, start, count, primcount);
}
info.update(object, count, primcount);
}
renderMultiDraw(starts, counts, drawCount) {
const {
extensions,
mode,
object,
info
} = this;
if (drawCount === 0) return;
const extension = extensions.get('WEBGL_multi_draw');
if (extension === null) {
for (let i = 0; i < drawCount; i++) {
this.render(starts[i], counts[i]);
}
} else {
if (this.index !== 0) {
extension.multiDrawElementsWEBGL(mode, counts, 0, this.type, starts, 0, drawCount);
} else {
extension.multiDrawArraysWEBGL(mode, starts, 0, counts, 0, drawCount);
}
let elementCount = 0;
for (let i = 0; i < drawCount; i++) {
elementCount += counts[i];
}
info.update(object, elementCount, 1);
}
}
renderMultiDrawInstances(starts, counts, drawCount, primcount) {
const {
extensions,
mode,
object,
info
} = this;
if (drawCount === 0) return;
const extension = extensions.get('WEBGL_multi_draw');
if (extension === null) {
for (let i = 0; i < drawCount; i++) {
this.renderInstances(starts[i], counts[i], primcount[i]);
}
} else {
if (this.index !== 0) {
extension.multiDrawElementsInstancedWEBGL(mode, counts, 0, this.type, starts, 0, primcount, 0, drawCount);
} else {
extension.multiDrawArraysInstancedWEBGL(mode, starts, 0, counts, 0, primcount, 0, drawCount);
}
let elementCount = 0;
for (let i = 0; i < drawCount; i++) {
elementCount += counts[i] * primcount[i];
}
info.update(object, elementCount, 1);
}
}
//
}
export { WebGLBufferRenderer };