[Development] Failed assertion in QSGBatchRenderer::ShaderManager::prepareMaterial()

[Bojan Petrović]

Hi Gunnar,

It's the official dynamic build for VS 2013. I am working on a laptop
with AMD Radeon HD 7470M card. Driver is 8.93-111205a-131054C (OpenGL
version 6.14.10.11399).

Bojan

On 17 February 2015 at 16:56, Gunnar Sletta <gunnar at sletta.org> wrote:

> The renderer will give that assertion if your OpenGL context isn’t working
> correctly. For instance, if you compiled Qt with desktop gl, but you don’t
> have up to date drivers. Though this should have been caught by the error
> checking in the render loop already, so it is a bit puzzling.
>
> What kind of Qt build is this? dynamic, desktop GL, Angle? What kind of
> driver / hardware?
>
> cheers,
> Gunnar
>
>
> On 17 Feb 2015, at 07:22, Bojan Petrović <bojan85 at gmail.com> wrote:
>
> Hi,
>
> I am using Qt 5.4 on Windows. I have encountered a failed assertion
> in QSGBatchRenderer::ShaderManager::prepareMaterial(QSGMaterial *
> material), line 158 C++. It happens when I start my application, but not
> every time. This is the message I got in the console:
>
> uniform highp float _qt_zRange;
>> void main()
>> {
>>     gl_Position = matrix * vertexCoord;
>>     color = vertexColor * opacity;
>>     gl_Position.z = (gl_Position.z * _qt_zRange + _qt_order) *
>> gl_Position.w;
>> }
>> ***
>> QOpenGLShader::compile(Fragment): Fragment shader failed to compile with
>> the fol
>> lowing errors:
>> *** Problematic Fragment shader source code ***
>> #define lowp
>> #define mediump
>> #define highp
>> varying lowp vec4 color;
>> void main()
>> {
>>     gl_FragColor = color;
>> }
>> ***
>> ASSERT: "shader->id_zRange >= 0" in file
>> scenegraph\coreapi\qsgbatchrenderer.cpp
>> , line 158
>
>
> Am I failing to respect some restriction or could this be a Qt bug?
>
> I created a debugger dump and I;m downloading Qt source now so I can see
> it in debugger, but I am not familiar with that code so I doubt that I will
> help me too much.
>
> Bojan
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