[Public WebGL] WEBGL_multiview discussion
Tue Jan 10 00:18:26 PST 2017
Addendum: The extension also does not define a formative section on what
identifiers it adds to shaders.
An example of how that works is contained there:
> When this extension is enabled:
> - ...
> - ...
> - ...
On Tue, Jan 10, 2017 at 9:12 AM, Florian Bösch <[email protected]> wrote:
> The extension adds the following:
> - FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_OVR accepted by
> - FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_OVR accepted by
> - MAX_VIEWS_OVR accepted by getParameter
> - FRAMEBUFFER_INCOMPLETE_VIEW_TARGETS_OVR accepted by
> - BACK_LEFT_AND_RIGHT_MULTIVIEW_WEBGL accepted by drawBuffer
> - framebufferTextureMultiviewWEBGL(...)
> - context creation parameter "stereo"
> - gl.drawBuffer
> - gl.BACK_LEFT
> - gl.BACK_RIGHT
> - layout qualifier to specify the number of views a shader renders
> There are some issues with that extension:
> 1. The enums BACK_LEFT and BACK_RIGHT are added to the
> WebGLRenderingContextBase instead of the extension objects IDL
> 2. the function drawBuffer which does not exist in WebGL is added to
> the WebGLRenderingContextBase instead of the extension objects IDL
> 3. The relationship between WebGL2 gl.drawBuffer*s* and this
> extensions drawBuffer is unclear
> 4. The layout qualifier is not WebGL1 compatible, and the extension
> does not define WebGL1 usable gl_NumViews constant or the like
> 5. The extension does not contain a differentiation between WebGL1 and
> WebGL2, but those need to be 2 specifications, so either there's two
> extensions needed, or this extension needs to define differing
> functionality in different sections for both WebGL1 and WebGL2
> 6. The examples section is insufficient, examples should be added for
> context creation and back buffer use, framebuffer object use and selection
> of traditional or stereo view rendering.
> 7. Since this extension is meant to interact with the WebVR
> specification, and the WebVR specification so far requires the application
> to render to the back buffer in split-view, the interaction with WebVR is
> unclear and should be clarified
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