0001684: GLByte color components are in range 0-127, not 0-255

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Severity

Reproducibility

Date Submitted

Last Update

0001684

[Croquet] Any

minor

always

08-16-05 02:38

08-20-05 03:27

Reporter

elenzil

View Status

public

Assigned To

Priority

normal

Resolution

no change required

Status

resolved

Summary

0001684: GLByte color components are in range 0-127, not 0-255

Description

When drawing points (and presumably other GL primitives)
with glDrawArrays (and presumably other methods)
with color components of type GLByte,
the color space seems to be the range 0-127, not 0-255.

Values of 127 are full, values of 128 and above are transformed to zero.

So when you would expect grey from 127, 127, 127, you get white,
and when you would expect the same grey but with a tiny bit of yellow added from 128, 128, 127, you get solid blue.

See screenshot below and attached TPrimitive subclass which demonstrate.

http://www.citris-uc.org/hosted/projects/ith/screenshots/GLByte%20colors.png [^]

Additional Information

Attached Files

TByteArrayPoint.st [^] (1,650 bytes) 08-16-05 02:38

Relationships

Notes
(0002448 - 140 - 140 - 140 - 140 - 140 - 140) bert 08-20-05 03:26	The range of GLByte is -128 to 127. This is not a bug. Read the OpenGL Spec. You'll also find GLUnsignedByte there with a range of 0 to 255.

Issue History
Date Modified	Username	Field	Change
08-16-05 02:38	elenzil	New Issue
08-16-05 02:38	elenzil	File Added: TByteArrayPoint.st
08-20-05 03:26	bert	Status	new => resolved
08-20-05 03:26	bert	Resolution	open => no change required
08-20-05 03:26	bert	Assigned To	=> bert
08-20-05 03:26	bert	Note Added: 0002448
08-20-05 03:27	bert	Assigned To	bert =>

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