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  [Solved] Using glScissor  (Read 466 times)
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Offline CopyableCougar4
« Posted 2014-08-22 21:35:32 »

I was reading about
glScissor
, but I couldn't figure out how to use it. This is what I have but it doesn't trim anything.

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glPushMatrix();
renderable.render();
glEnable(GL_SCISSOR_TEST);
glScissor(Math.round(panel.x + sx), Math.round(panel.y + sy), Math.round(panel.width), Math.round(panel.height));
glDisable(GL_SCISSOR_TEST);
glPopMatrix();


Hope someone can help me Smiley

CopyableCougar4

Either wandering the forum or programming. Most likely the latter Smiley

Github: http://github.com/CopyableCougar4
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« Reply #1 - Posted 2014-08-22 22:06:23 »

You didn't draw anything...

The scissor test clips drawing while it's enabled.

Cas Smiley

Offline CopyableCougar4
« Reply #2 - Posted 2014-08-22 22:37:36 »

I shifted the rendering to after glScissor and it doesn't show anything? Do I have to flip the Y value for glScissor?

CopyableCougar4

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Github: http://github.com/CopyableCougar4
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Offline CopyableCougar4
« Reply #3 - Posted 2014-08-22 22:42:48 »

So I adjusted for OpenGL's y values and I think I got it working Smiley

Code:
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glPushMatrix();
glEnable(GL_SCISSOR_TEST);
glScissor(Math.round(panel.x + sx), (Launcher.getHeight() - Math.round(panel.y + sy)) - Math.round(panel.height), Math.round(panel.width), Math.round(panel.height));
renderable.render();
glDisable(GL_SCISSOR_TEST);
glPopMatrix();

Either wandering the forum or programming. Most likely the latter Smiley

Github: http://github.com/CopyableCougar4
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