Bug 720 – Writing with compressed textures will always fail due to invalid parameters

Khronos Public Bugzilla

Bug 720 - Writing with compressed textures will always fail due to invalid parameters


Summary:	Writing with compressed textures will always fail due to invalid parameters

Status:	NEW

Product:	KTX
Classification:	Unclassified
Component:	library
Version:	unspecified
Hardware:	PC Windows

Importance:	P3 normal
Target Milestone:	---
Assigned To:	callow.mark
QA Contact:

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Reported:	2012-09-24 11:47 PDT by svlad
Modified:	2012-09-24 11:47 PDT (History)
CC List:	0 users

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Description svlad 2012-09-24 11:47:07 PDT

Writing a compressed texture to the KTX format with libktx 1.0.1 will always fail due to the following code in ktxWriteKTXF():

if (header.glTypeSize != sizeofGLtype(header.glType))
    return KTX_INVALID_VALUE;

According to the format standard a compressed texture shall have a glType value of 0 and a glTypeSize value of 1. The combination of values will always fail the test above.

Removing the check and replacing it with the following one *after* compression has been detected should do the trick:

if (!compressed && (header.glTypeSize != sizeofGLtype(header.glType)))
    return KTX_INVALID_VALUE;^M