Could not set the background color

[leonsal]

Hi,

In my tests after generating the drawing commands for several rectangles,
the framebuffer is cleared to white, but the background of my window remains black.
Please see the screenshot.

Commands executed after drawing the rectangles:

...
mPainter->end();
// Make sure we are rendering to the default fraembuffer of GL
fastuidraw_glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);

// Clear the framebuffer
fastuidraw_glClearColor(1.0, 1.0, 1.0, 1.0);
fastuidraw_glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

// blit the contents of m_surface to the default framebuffer with nearest filtering
mSurface->blit_surface(GL_NEAREST);
...

Any ideas of what could be wrong ?

[krogueintel]

The function blit_surface() copies the contents of the surface to the framebuffer which completely overwrites the contents of the framebuffer; you need to give the PainterSurfaceGL object the white background. This is done by the method clear_color() of PainterSurface: https://intel.github.io/fastuidraw/docs/html/d5/d60/classfastuidraw_1_1_painter_surface.html#a7faefd57636f4c98b13ed6aab6744cab .

[leonsal]

It worked, but when I continuously resize the window, the background color alternates between
black and white in a flickering effect. Please see this.

[krogueintel]

You need to set the clear color before Painter::begin(). That function clears the surface with it's clear color.

[krogueintel]

If setting he clear color resolved the issue, we should close it.

[leonsal]

It is much better, though there are still some artifacts. I will continue testing. Thanks.