This is a post effects shader for CRYENGINE that enhances the default sharpening and adds texture sharpening.
The code for the sharpening begins on the line 1352.
By default the value is 5. You can change it by modyfing the following code:
float textureSharpenAmount = 5; // e.g., add a new param to control this
The control of the texture sharpen can be controlled only in the shader file. This only includes the shader - not any new CVars. When editing the shader you can have CRYENGINE open. Once saved the shader will automatically reloads and you will be able to see the changes. You also must have r_sharpening CVar set to at least 1.