Add a test case for correctly aligned pixel rendering. Not yet working for Direct3d

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3690 dfc29bdd-3216-0410-991c-e03cc46cb475

tests/drawPixel.cpp

@@ -15,7 +15,7 @@ using namespace gui;
 	One line should run from green at the top left to red at the bottom right.
 	The other should run from cyan 100% transparent at the bottom left to
 	cyan 100% opaque at the top right. */
-static bool runTestWithDriver(E_DRIVER_TYPE driverType)
+static bool lineRender(E_DRIVER_TYPE driverType)
 {
 	IrrlichtDevice *device = createDevice( driverType, dimension2d<u32>(160, 120), 32);
 	if (!device)
@@ -53,21 +53,84 @@ static bool runTestWithDriver(E_DRIVER_TYPE driverType)
 	return result;
 }
 
+// this test draws alternating white and black borders with
+// increasing thickness. Intended use of this test is to ensure
+// the corect pixel alignment within the render window.
+static bool pixelAccuracy(E_DRIVER_TYPE driverType)
+{
+	IrrlichtDevice *device = createDevice( driverType, dimension2d<u32>(160, 120), 32);
+	if (!device)
+		return true; // Treat a failure to create a driver as benign; this saves a lot of #ifdefs
+
+	IVideoDriver* driver = device->getVideoDriver();
+
+	device->getSceneManager()->addCameraSceneNode();
+
+	driver->beginScene(true, true, SColor(255,100,101,140));
+	u32 start=0;
+	for (u32 count=1; count<10; ++count)
+	{
+		for (u32 j=0; j<count; ++j)
+		{
+			for (u32 x=0; x<100-start; ++x)
+			{
+				driver->drawPixel(start+x, start, (count%2==1)?0xffffffff:0xff000000);
+			}
+			++start;
+		}
+	}
+	start=0;
+	for (u32 count=1; count<10; ++count)
+	{
+		for (u32 j=0; j<count; ++j)
+		{
+			for (u32 x=0; x<100-start; ++x)
+			{
+				driver->drawPixel(start, start+x, (count%2==1)?0xffffffff:0xff000000);
+			}
+			++start;
+		}
+	}
+	for (u32 x=0; x<100; ++x)
+	{
+		driver->drawPixel(x, x, 0xffff0000);
+	}
+	driver->endScene();
+
+	bool result = takeScreenshotAndCompareAgainstReference(driver, "-pixelAccuracy.png");
+
+	device->closeDevice();
+	device->run();
+	device->drop();
+
+	return result;
+}
 
 bool drawPixel(void)
 {
 	bool passed = true;
 
 	logTestString("Check OpenGL driver\n");
-	passed &= runTestWithDriver(EDT_OPENGL);
+	passed &= lineRender(EDT_OPENGL);
+	logTestString("Check Software driver\n");
+	passed &= lineRender(EDT_SOFTWARE);
+	logTestString("Check Burning's Video driver\n");
+	passed &= lineRender(EDT_BURNINGSVIDEO);
+	logTestString("Check Direct3D9 driver\n");
+	passed &= lineRender(EDT_DIRECT3D9);
+	logTestString("Check Direct3D8 driver\n");
+	passed &= lineRender(EDT_DIRECT3D8);
+
+	logTestString("Check OpenGL driver\n");
+	passed &= pixelAccuracy(EDT_OPENGL);
 	logTestString("Check Software driver\n");
-	passed &= runTestWithDriver(EDT_SOFTWARE);
+	passed &= pixelAccuracy(EDT_SOFTWARE);
 	logTestString("Check Burning's Video driver\n");
-	passed &= runTestWithDriver(EDT_BURNINGSVIDEO);
+	passed &= pixelAccuracy(EDT_BURNINGSVIDEO);
 	logTestString("Check Direct3D9 driver\n");
-	passed &= runTestWithDriver(EDT_DIRECT3D9);
+	passed &= pixelAccuracy(EDT_DIRECT3D9);
 	logTestString("Check Direct3D8 driver\n");
-	passed &= runTestWithDriver(EDT_DIRECT3D8);
+	passed &= pixelAccuracy(EDT_DIRECT3D8);
 
 	return passed;
 }