1000443 - WebGL: texSubImage2D fails on float textures

Status: RESOLVED DUPLICATE of bug 1003607

(Core :: Graphics: CanvasWebGL, defect)

Description

[Daniel Lewis]

Attachment: texsubimage2d_float.html

User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.116 Safari/537.36

Steps to reproduce:

1. Create a WebGL context with the OES_texture_float extension
2. Create, bind an initialise a float texture using texImage2D
3. Try to update the texture using texSubImage2D

You can run this JSFiddle with the console open to catch the error:

http://jsfiddle.net/5htBG/3/

or there is a file attached (texsubimage2d_float.html)


Actual results:

texSubImage2D fails to update the texture, throwing this error instead:

Error: WebGL: texSubImage2D: format or type doesn't match the existing texture


Expected results:

texSubImage2D should succeed, no error should be thrown regarding format.

I suspect this bug may be due to the extra type checking added to pass conformance tests:

https://bugzilla.mozilla.org/show_bug.cgi?id=667222

Perhaps the problem might be that the desktop OpenGL internal format is "RGBA32F", while in OpenGL ES or WebGL this is simplified as just RGBA and FLOAT?

Float textures are popular for things like GPU-based particle systems, and texSubImage2D provides a neat way to update a subset of particle data.