1247053 - WebGL 1 GLSL ES function textureCubeLod() is not implemented.

Status: RESOLVED INVALID

(Core :: Graphics: CanvasWebGL, defect)

Description

[Jukka Jylänki]

Attachment: texturecubelod.html

Looks like the OpenGL ES Shading Language built-in texture lookup function textureCubeLod() has not been implemented. (see https://www.khronos.org/registry/gles/specs/2.0/GLSL_ES_Specification_1.0.17.pdf page 72)

STR: Run the attached page.

Observed: The page prints "*** Error compiling FRAGMENT_SHADER '[object WebGLShader]':ERROR: 0:9: 'textureCubeLod' : no matching overloaded function found "

Expected: The function textureCubeLod() is a built-in, so should be present on WebGL 1 contexts.

Comment 1

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

That's actually incorrect.  If you read the paragraph of text above these:

"The built-ins suffixed with “Lod” are allowed only in a vertex shader."

To use these in a fragment shader, you need to enable and use EXT_shader_texture_lod.  See bug 965848.

Comment 2

[Jukka Jylänki]

Doh, of course. Thanks!