Christian Duerr f37dd5c5bc Draw visual bell as big quad over everything ... A method `render_rect` has been added that allows drawing a rectangle over anything in the terminal. This is used by the visual bell to draw a big rectangle over everything. To achieve this a new shader has been added. Shaders are now kept around until the program is dropped. Then whenever a rectangle draw call is issued, the shader is swapped from the default shader to the rectangle drawing shader. After the shader has been swapped and the rectangle has been drawn, uniforms (like projection) and blending function are reset to make sure the rendering can be continued on the default shader. All current instances of visual_bell in the rendering have been removed, it is now all done exclusively through the rectangle rendering function. Currently the shaders are swapped every time `render_rect` is called, so when rendering multiple rectangles (potentially for underline / strikethrough) there would be a loads of shader swaps that could be potentially very expensive. So before using `render_rect` for a different application, the shader swap should be removed from the `render_rect` method. As long as the visual bell's alpha value is 0, this has no effect on performance because no rectangle is rendered.		2018-02-16 22:41:55 +01:00
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rect.f.glsl	Draw visual bell as big quad over everything	2018-02-16 22:41:55 +01:00
rect.v.glsl	Draw visual bell as big quad over everything	2018-02-16 22:41:55 +01:00
text.f.glsl	Draw visual bell as big quad over everything	2018-02-16 22:41:55 +01:00
text.v.glsl	Draw visual bell as big quad over everything	2018-02-16 22:41:55 +01:00