big changes here:

- Eliminate the useless check for cpu modifications option from efb to ram as it must be enabled always
- use constant names in dx11 for buffer length calculation instead to simplify code reading
- implemented scaled efb copy in opengl, still bugy in some games, the option is not in the gui but will add it when it works perfect
- Change the depth calculation behavior:
if the game use z textures is exactly the same as before.
if the game do not use z texture calculate z values in the vertex shader. the advantage id this approach is that early z culling is applied,
improving fill rate. this mus speed up things, even with ssaa and msaa enabled.
please test for regression and enjoy.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5896 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/VideoCommon/Src/PixelShaderGen.h

@@ -37,9 +37,8 @@
 #define C_INDTEXSCALE  (C_ZBIAS + 2)
 #define C_INDTEXMTX    (C_INDTEXSCALE + 2)
 #define C_FOG          (C_INDTEXMTX + 6)
-#define C_ENVCONST_END (C_FOG + 2)
-
 #define C_COLORMATRIX  (C_FOG + 2)
+#define C_PENVCONST_END (C_COLORMATRIX + 16)
 #define PIXELSHADERUID_MAX_VALUES (5 + 32 + 6 + 11)
 
 // DO NOT make anything in this class virtual.