Fix for RTShader GLSLES Writer

[KelevrA]

Hi to all.
When i start test OGRE 1.8 with GLES2 on android, i found bug on device with PowerVR graphic card (LG Optimus Black SGX530, Nexus Prime SGX 540, Galaxy Tab P1000 SGX530 and other sgx, as i think), models was black (on some device) or filled by random color =( But on SGS2 with Mali-400 all works fine.

Bug was in (FFP_Add(gl_FragColor.xyz, lLocalParam_0.xyz, gl_FragColor.xyz)) and other func wich take gl_FragColor as out parma.

This is the fixed class of OgreShaderGLSLESProgramWriter

OgreShaderGLSLESProgramWriter.cpp

I surround my code with // ***************************************** lines.

Good luck.

[masterfalcon]

Thanks! I don't have any android devices but I'll commit this on good faith.

[KelevrA]

If some one test this it will be good =) I tested this on 4 PowerVR devices.

It's just replace gl_FragColor passed in func, and at end of fragment shader write line "gl_FragColor = tmpFragColor;"

[Shamun]

I've got another update to the glsleswriter.
The sgs2 can't handle gl_Position as out parameter so I changed it. (same fix as gl_FragColor)
So now I can see my models but black for some reason, only when using sgs2. (I've tested the code on the Tegra 2 and it works great)

[Shamun]

Apparently the Mali-400 can't handle any varying as out parameter so I changed the glsles writer and now it looks great.
I'll upload a patch soon.

Here is the patch https://sourceforge.net/tracker/?func=d ... tid=302997