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@@ -65,4 +65,37 @@ make && sudo make install
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```
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### Shaders
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-These are implemented, but not flushed out. I haven't gotten around to writing some tutorials on them. So check back later!
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+
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+Slop allows for chained post-processing shaders. Shaders are written in a language called GLSL, and have access to the following data from slop:
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+| GLSL Name | Data Type | Bound to |
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+|------------|----------------|-------------------------------------------------------------------------------------------------|
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+| mouse | vec2 | The mouse position on the screen. |
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+| desktop | sampler2D | An upside-down snapshot of the desktop, this doesn't update as the screen changes. |
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+| texture | sampler2D | The current pixel values of slop's frame buffer. Usually just contains the selection rectangle. |
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+| screenSize | vec2 | The dimensions of the screen, where the x value is the width. |
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+| position | vec2 attribute | This contains the vertex data for the rectangle. Only contains (0,0), (1,0), (1,1), and (0,1). |
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+| uv | vec2 attribute | Same as the position, this contians the UV information of each vertext. |
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+The desktop texture is upside-down because flipping it would cost valuable time.
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+
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+Shaders must be placed in your `${XDG_CONFIG_HOME}/slop` directory, where *XDG_CONFIG_HOME* is typically `~/.config/`. This folder won't exist unless you make it yourself.
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+
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+Shaders are loaded from the `--shader` flag in slop. They are delimited by commas, and rendered in order from left to right. This way you can combine multiple shaders for interesting effects! For example, `slop -rblur1,wiggle` would load `~/.config/slop/blur1{.frag,.vert}` and `~/.config/slop/wiggle{.frag,.vert}`. Then render the selection rectangle twice, each time accumulating the changes from the different shaders.
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+
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+Enough chatting about it though, here's some example shaders you can copy to `~/.config/slop` to try out!
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+
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+* `slop -rblur1,blur2 -b100` | `~/.config/slop/{blur1,blur2}{.frag,.vert}`
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+
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+* `slop -rwiggle -b10` | `~/.config/slop/wiggle{.frag,.vert}`
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+
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+And all together now...
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+* `slop -rblur1,blur2,wiggle -b50 -c1,1,1` | `~/.config/slop/{blur1,blur2,wiggle}{.frag,.vert}`
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+
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+
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+Finally here's an example of a magnifying glass.
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+* `slop -rcrosshair` | `~/.config/slop/crosshair{.frag,.vert}`
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+It's fairly easy to adjust how the shaders work by editing them with your favourite text editor. Or even make your own!
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naelstrof
7 years ago