Updated Cg shaders (markdown)

Cg-shaders.md

@@ -1,35 +1 @@
-## Purpose
-Cg shaders is a spec from nVidia. It has the great advantage that shaders written in Cg are compatible with both OpenGL and Direct3D. It is also compatible with PlayStation 3 as well. They are also compatible with basic HLSL if some considerations are taken into account. They can even be automatically compiled into [[GLSL shaders]], which makes Cg shaders a true "write once, run everywhere" shader format.
-We encourage new shaders targeting RetroArch to be written in this format.
-
-### Example Cg shader
-    void main_vertex
-    (
-       float4 position : POSITION,
-       out float4 oPosition : POSITION,
-       uniform float4x4 modelViewProj,
-       float2 tex : TEXCOORD,
-       out float2 oTex : TEXCOORD
-    )
-    {
-       oPosition = mul(modelViewProj, position);
-       oTex = tex;
-    }
-
-    float4 main_fragment (float2 tex : TEXCOORD, uniform sampler2D s0 : TEXUNIT0) : COLOR
-    {
-       return tex2D(s0, tex);
-    }
-
-## Specification
-The Cg shader spec used in RetroArch is documented [here](https://github.com/Themaister/Emulator-Shader-Pack/blob/master/Cg/README). It defines single-pass Cg shaders as well as multi-pass shaders using a custom Cg preset format (.cgp).
-
-### Example Cg preset
-    shaders = 2
-    shader0 = 4xBR-v3.9.cg
-    scale_type0 = source
-    scale0 = 4.0
-    filter_linear0 = false
-    shader1 = dummy.cg
-    filter_linear1 = true
-
+This doc is now part of [https://github.com/libretro/docs libretro-docs] and can be viewed here: https://github.com/libretro/docs