Rendering glitches

[barnex]

This rendering glitch occurred for me with m000000.ovf obtained from mumax/3/test/standardproblem4.txt (I will mail you the file). Only present when rendering vectors.

Edit: this was on Linux (obviously) and only occurs when rendering on my intel graphics. Nvidia does it fine.

[grahamrow]

Looks cool! Does it complain about loading the shaders? Could you send the OpenGL debug info written to terminal? This modern OpenGL stuff is really a headache!

[barnex]

There's not much to see here:

VENDOR: Intel Open Source Technology Center RENDERDER: Mesa DRI Intel(R) Ivybridge Mobile VERSION: 3.1 (Core Profile) Mesa 9.2.1 GLSL VERSION: 1.40 QBackingStore::flush() called with non-exposed window, behavior is undefined QBackingStore::flush() called with non-exposed window, behavior is undefined QBackingStore::flush() called with non-exposed window, behavior is undefined QBackingStore::flush() called with non-exposed window, behavior is undefined QBackingStore::flush() called with non-exposed window, behavior is undefined QBackingStore::flush() called with non-exposed window, behavior is undefined QBackingStore::flush() called with non-exposed window, behavior is undefined QBackingStore::flush() called with non-exposed window, behavior is undefined

[grahamrow]

Hmmm... I only have a discrete graphics card (on which the file you sent renders fine). What happens if you change to the boring fragment shader (line 218 in glwidget_assets.cpp):

-- result = result && vect.shader.addShaderFromSourceFile( QOpenGLShader::Fragment, ":/shaders/diffuse.frag" ); ++ result = result && vect.shader.addShaderFromSourceFile( QOpenGLShader::Fragment, ":/shaders/standard.frag" );

[barnex]

Using the standard fragment sharder instead of diffuse indeed seems to solve it.

On 2014-02-14 16:16, Graham Rowlands wrote:

result = result && vect.shader.addShaderFromSourceFile( QOpenGLShader::Fragment, ":/shaders/standard.frag" );

[grahamrow]

It looks like I'll be added a number of fallback options, such as using basic shaders. Probably I'll reintroduce my old OpenGL 1.2 code for backwards compatibility...

[grahamrow]

I get this same sort of issue occasionally on an AMD Radeon 5770 card. I'm still planning on adding a compatibility option...