XRWebGLSubImage: imageIndex property
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The read-only imageIndex
property of the XRWebGLSubImage
interface is a number representing the offset into the texture array if the layer was requested with texture-array
; null
otherwise.
Value
A number or null
if the layer wasn't requested with texture-array
.
Using imageIndex
The imageIndex
property can be passed WebGL2RenderingContext.framebufferTextureLayer()
to attach the depth and color textures to a framebuffer with the correct layer index.
js
const xrGlBinding = new XRWebGLBinding(xrSession, gl);
const layer = xrGlBinding.createProjectionLayer({
textureType: "texture-array",
});
const framebuffer = gl.createFramebuffer();
xrSession.updateRenderState({ layers: [layer] });
xrSession.requestAnimationFrame(onXRFrame);
function onXRFrame(time, xrFrame) {
xrSession.requestAnimationFrame(onXRFrame);
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
const viewport = xrGlBinding.getSubImage(layer, xrFrame).viewport;
gl.viewport(viewport.x, viewport.y, viewport.width, viewport.height);
for (const view in xrViewerPose.views) {
const subImage = xrGlBinding.getViewSubImage(layer, view);
gl.framebufferTextureLayer(
gl.FRAMEBUFFER,
gl.COLOR_ATTACHMENT0,
subImage.colorTexture,
0,
subImage.imageIndex
);
gl.framebufferTextureLayer(
gl.FRAMEBUFFER,
gl.DEPTH_ATTACHMENT,
subImage.depthStencilTexture,
0,
subImage.imageIndex
);
// Render from the viewpoint of xrView
}
}
Specifications
Specification |
---|
WebXR Layers API Level 1 # dom-xrwebglsubimage-imageindex |
Browser compatibility
BCD tables only load in the browser