StackOverflow2013

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PO
primarykey
Id
13690209
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2012-12-03T19:23:41.397
FavoriteCount
0
LastActivityDate
2012-12-04T14:50:19.773
LastEditDate
2012-12-04T14:50:19.773
LastEditorUserId
1871166
OwnerUserId
1871166
ParentId
13676070
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
After hours of further research I've found out that this problem is specific to Adreno 200 GPU that is utilized in my Samsung Galaxy Ace (GT-S5830). It seems like Adreno 200 driver assigns the texture to the sampler in the first call to a drawing function and after that it ignores any changes to the sampler value (<code>glUniform1i(samplerLocation, textureImageUnit)</code>) until one of the two occurs: <ul> <li><code>glUseProgram</code> is called with a different shader program,</li> <li>a different texture is bound to any texture image unit used by the shader program.</li> </ul> There's a <a href="https://developer.qualcomm.com/forum/qdevnet-forums/mobile-gaming-graphics-optimization-adreno/8896" rel="nofollow">thread</a> in the forums of the manufacturer of Adreno 200 GPU describing the very same problem. So if you call drawing functions several times with the same shader program and with different textures bound before, there are two workarounds to the described problem: <ol> <li>Call <code>glUseProgram(0); glUseProgram(yourDrawingProgram);</code> before every drawing function.</li> <li>Before every drawing call, bind different texture to at least one texture image unit used by your shader program. This solution can be difficult to maintain, because if you bind the same texture that is already bound to the texture image unit, the problem will remain. So in this case the easiest solution is to simply not change sampler values and bind textures of all texture image units used by the shader program before every drawing call.</li> </ol>
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1. POHow to properly mix drawing calls and changes of a sampler value with a single shader program?
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1. USuser1871166
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1. USuser1871166
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1. POHow to properly mix drawing calls and changes of a sampler value with a single shader program?
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1. COThank for this, I've no idea how I'd have narrowed down the problem myself.
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