Remove useless depth-related stuff from 2D rendering #1439
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This is a very 3D effect, the last thing that would make sense in a 2D shader.
Also remove the 'gl_FragDepth = 0;' bit from the 2D GLSL shader. It seemed to have no effect anyway, but with depth testing and writing disabled we can be sure of it.
With RmlUi transforms and 3D CSS directives such as transform: rotateX(...), nonzero z coordinates could be produced. Instead of relying on GL_DEPTH_CLAMP which is not always available to prevent clipping by near or far planes, just use a projection matrix that always maps z to 0.
All 3D rendering and even screen-space effects are done in FBOs. The default framebuffer is only targeted when drawing the UI, so a depth buffer is not neede.
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Disable depth fade, depth testing, depth writing for 2D rendering. Don't create a depth or stencil channel in the default framebuffer.
Instead of using the "depth clamp" GL extension (which disables clipping based on the z-coordinate), set the projection matrix to make z always 0. This is relevant if we use 3d CSS transformations like these.