vs_CellFace: Add log depth hook to fix cell edge geometry and mesh lines

vs_CellFace.glsl and vs_2dTextureCellFace.glsl were missing the
calcLogDepth() call after setting gl_Position. This left v_logz
undefined, causing fs_Standard's applyLogDepth() to write garbage
gl_FragDepth values. Side faces disappeared and mesh lines were
invisible because their log depth values failed the LEQUAL depth
test against the incorrect surface depths.

Author: magnesj

ApplicationExeCode/Resources/vs_2dTextureCellFace.glsl

@@ -126,5 +126,8 @@ void main()
     v_ecNormal = cvfu_normalMatrix * cvfa_normal;
 
     gl_Position = cvfu_modelViewProjectionMatrix*cvfa_vertex;
+#ifdef CVF_LOG_DEPTH_IMPL
+    calcLogDepth(gl_Position);
+#endif
 }
 

ApplicationExeCode/Resources/vs_CellFace.glsl

@@ -177,5 +177,8 @@ void main()
     v_ecNormal = cvfu_normalMatrix * cvfa_normal;
 
     gl_Position = cvfu_modelViewProjectionMatrix*cvfa_vertex;
+#ifdef CVF_LOG_DEPTH_IMPL
+    calcLogDepth(gl_Position);
+#endif
 }