OpenGL Renderer: Partially revert commit 0f045d4 -- don't do the Z adjust in the vertex shader. Apparently, we shouldn't need to explicitly do this in OpenGL, as this adjustment should be automatic. Fixes a graphical glitch that can occur in "Sonic Chronicles: The Dark Brotherhood".

desmume/src/OGLRender.cpp

@@ -294,8 +294,7 @@ void main() \n\
 	\n\
 	vtxTexCoord = texScaleMtx * inTexCoord0; \n\
 	vtxColor = vec4(inColor / 63.0, polyAlpha); \n\
-	gl_Position.xyw = inPosition.xyw;\n\
-	gl_Position.z = (inPosition.z + inPosition.w) / 2.0;\n\
+	gl_Position = inPosition;\n\
 } \n\
 "};
 

desmume/src/OGLRender_3_2.cpp

@@ -146,8 +146,7 @@ void main()\n\
 	\n\
 	vtxTexCoord = texScaleMtx * inTexCoord0;\n\
 	vtxColor = vec4(inColor / 63.0, polyAlpha);\n\
-	gl_Position.xyw = inPosition.xyw;\n\
-	gl_Position.z = (inPosition.z + inPosition.w) / 2.0;\n\
+	gl_Position = inPosition;\n\
 }\n\
 "};