Updated GLSL shaders (markdown => mediawiki)

GLSL-shaders.md

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-## Purpose
-GLSL shader support exists to be compatible in case [[Cg shaders]] cannot be supported, which is the case for OpenGL ES, and EGL contexts ([[KMS mode]] in Linux for one).
-
-Like Cg shaders, GLSL shaders represent a single pass, and requires a preset file to describe how multiple shaders are combined. The extension is .glsl. The internal format of the shaders are the same as modern [[XML shaders]].
-
-As GLSL shaders are normally placed in two different files (vertex, fragment), making it very impractical to select in a menu. This is worked around by using compiler defines in order to be equivalent to Cg shaders.
-
-### Example GLSL shader
-    varying vec2 tex_coord;
-    #if defined(VERTEX)
-        attribute vec2 TexCoord;
-        attribute vec2 VertexCoord;
-        uniform mat4 MVPMatrix;
-        void main()
-        {
-            gl_Position = MVPMatrix * vec4(VertexCoord, 0.0, 1.0);
-            tex_coord = TexCoord;
-        }
-    #elif defined(FRAGMENT)
-        uniform sampler2D Texture;
-        void main()
-        {
-            gl_FragColor = texture2D(Texture, tex_coord);
-        }
-    #endif
-
-GLSL shaders must be modern style, and using `ruby` prefix is discouraged.
-
-## Converting from Cg shaders
-GLSL shaders are mostly considered a compatibility format. It is possible to compile Cg shaders into GLSL shaders automatically using our `cg2glsl` script found [here](https://github.com/Themaister/RetroArch/blob/master/tools/cg2glsl.py). It can convert single shaders as well as batch conversion.
-
-It relies on nVidia's `cgc` tool found in `nvidia-cg-toolkit` package.
-
-## GLSL preset
-Like [[Cg shaders]], there is a preset format. Instead of .cgp extension, .glslp extension is used. The format is exactly the same, just replace .cg shaders with .glsl. To convert a .cgp preset, rename to .glslp and replace all references to .cg shaders with .glsl.

GLSL-shaders.mediawiki

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+This doc is now part of [https://github.com/libretro/docs libretro-docs] and can be viewed here: https://github.com/libretro/docs