- Minor improvements in D3D8/D3D9 blend operation mechanism.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4785 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CD3D8Driver.cpp

@@ -1590,14 +1590,17 @@ void CD3D8Driver::setBasicRenderStates(const SMaterial& material, const SMateria
 		pID3DDevice->SetRenderState(D3DRS_COLORWRITEENABLE, flag);
 	}
 
-	if (queryFeature(EVDF_BLEND_OPERATIONS) &&
-		(resetAllRenderstates|| lastmaterial.BlendOperation != material.BlendOperation))
+    // Blend Operation
+	if (resetAllRenderstates || lastmaterial.BlendOperation != material.BlendOperation)
 	{
 		if (material.BlendOperation==EBO_NONE)
 			pID3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
 		else
 		{
 			pID3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE);
+
+			if (queryFeature(EVDF_BLEND_OPERATIONS))
+			{
                 switch (material.BlendOperation)
                 {
                 case EBO_MAX:
@@ -1622,6 +1625,7 @@ void CD3D8Driver::setBasicRenderStates(const SMaterial& material, const SMateria
                 }
             }
 		}
+	}
 
 	// Polygon offset
 	if (queryFeature(EVDF_POLYGON_OFFSET) && (resetAllRenderstates ||

source/Irrlicht/CD3D9Driver.cpp

@@ -2301,14 +2301,17 @@ void CD3D9Driver::setBasicRenderStates(const SMaterial& material, const SMateria
 		pID3DDevice->SetRenderState(D3DRS_COLORWRITEENABLE, flag);
 	}
 
-	if (queryFeature(EVDF_BLEND_OPERATIONS) &&
-		(resetAllRenderstates|| lastmaterial.BlendOperation != material.BlendOperation))
+    // Blend Operation
+	if (resetAllRenderstates || lastmaterial.BlendOperation != material.BlendOperation)
 	{
 		if (material.BlendOperation==EBO_NONE)
 			pID3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
 		else
 		{
 			pID3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE);
+
+			if (queryFeature(EVDF_BLEND_OPERATIONS))
+			{
                 switch (material.BlendOperation)
                 {
                 case EBO_SUBTRACT:
@@ -2333,6 +2336,7 @@ void CD3D9Driver::setBasicRenderStates(const SMaterial& material, const SMateria
                 }
             }
 		}
+	}
 
 	// Polygon offset
 	if (queryFeature(EVDF_POLYGON_OFFSET) && (resetAllRenderstates ||