gsdx ogl: Enable by default advance DATE effect on nvidia (GL4 GPU)

Note: DATE is used for shadows (persona 3) and others effect

You can disable it when you disable gl image extension (override_GL_ARB_shader_image_load_store = 0)
You can also enable it on AMD too (set it to 1 this time) but no guarantee.

If you feel the extension is too slow, you can try disable some gl barrier (aka "damn the torpedo full steam ahead!").
It can be done with the option UserHacks_DateGL4 = 1. Otherwise just disable the extension.

Note: don't enable UserHacks_AlphaStencil in the same time. GL_ARB_shader_image_load_store is an alternative implementation.
Enabling both in the same time will lead to undefined (well surely wrong) behavior.




git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5890 96395faa-99c1-11dd-bbfe-3dabce05a288
the "don't let users shoot themself in the foot" commit

UserHacks_AlphaStencil will take precedence on override_GL_ARB_shader_image_load_store


git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5891 96395faa-99c1-11dd-bbfe-3dabce05a288
GameGB: Syphon Filter - Omega Strain Europe patch for Flashlight. Removed an incorrect/pointless patch on the US version.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5892 96395faa-99c1-11dd-bbfe-3dabce05a288
SPU2-X: Just fixing up a small error i came across while looking into something else. Nothing to see here.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5893 96395faa-99c1-11dd-bbfe-3dabce05a288