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Add texture-array option to projection layer sample #205

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Jan 23, 2025
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Add texture-array option to projection layer sample #205

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57 changes: 39 additions & 18 deletions layers-samples/proj-layer.html
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,7 @@
controllers or menu systems/other UI elements.
<a class="back" href="./index.html">Back</a>
</p>
<input type="checkbox" id="texture-array">Use Texture Array</input>
</details>
</header>
<main style='text-align: center;'>
Expand All @@ -65,6 +66,7 @@
}

// XR globals.
let textureArrayCheck = document.getElementById('texture-array');
let xrButton = null;
let xrSession = null;
let xrRefSpace = null;
Expand All @@ -80,6 +82,7 @@

// Layer globals
let proj_layer = null;
let usingTextureArray = false;

function initXR() {
xrButton = new WebXRButton({
Expand Down Expand Up @@ -144,7 +147,10 @@

session.requestReferenceSpace('local').then((refSpace) => {
xrRefSpace = refSpace;
proj_layer = xrGLFactory.createProjectionLayer({ space: refSpace, stencil: false });
usingTextureArray = textureArrayCheck.checked;
proj_layer = xrGLFactory.createProjectionLayer({
textureType: usingTextureArray ? 'texture-array' : 'texture',
space: refSpace, stencil: false });
session.updateRenderState({ layers: [proj_layer] });

session.requestAnimationFrame(onXRFrame);
Expand Down Expand Up @@ -183,24 +189,39 @@
glLayer.framebuffer = xrFramebuffer;
viewport = glLayer.viewport;
gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, glLayer.colorTexture, 0);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, glLayer.depthStencilTexture, 0);

gl.enable(gl.SCISSOR_TEST);
gl.scissor(viewport.x, viewport.y, viewport.width, viewport.height);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.disable(gl.SCISSOR_TEST);

// Gather all the values needed for one view and push it into the
// array of views to be drawn. WebXRView is a utility class that
// holds all the necessary values for drawing a single view.

// In future samples we'll hide this part away as well by using the
// scene.drawXRViews() function, which handles gathering these
// values internally.
views.push(new WebXRView(view, glLayer, viewport));

if (usingTextureArray) {
gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, glLayer.colorTexture, 0, glLayer.imageIndex);
gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, glLayer.depthStencilTexture, 0, glLayer.imageIndex);

// No need to set the scissor when clearing a layered texture, since only one layer is exposed at a time.
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

scene.drawViewArray([new WebXRView(view, glLayer, viewport)]);
} else {
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, glLayer.colorTexture, 0);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, glLayer.depthStencilTexture, 0);

// If you need to clear a non-layered texture you must set the scissor to the sub image viewport. Otherwise
// you will clear sections of the texture that have already been drawn to by previous views.
gl.enable(gl.SCISSOR_TEST);
gl.scissor(viewport.x, viewport.y, viewport.width, viewport.height);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.disable(gl.SCISSOR_TEST);

// Gather all the values needed for one view and push it into the
// array of views to be drawn. WebXRView is a utility class that
// holds all the necessary values for drawing a single view.

// In future samples we'll hide this part away as well by using the
// scene.drawXRViews() function, which handles gathering these
// values internally.
views.push(new WebXRView(view, glLayer, viewport));
}
}
if (!usingTextureArray) {
scene.drawViewArray(views);
}
scene.drawViewArray(views);
}
scene.endFrame();
}
Expand Down