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 <boja...@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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