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The drawing of the robot image utilizes drawScreen() again, so the robot s transparent background won t be rendered: private void drawRobotImage(float xc, float yc, float size) /* The screen is centered on (xc, yc), with sides of length size, and standing upright. */ { float[] verts = { xc-size/2, yc+size/2, 0, xc+size/2, yc+size/2, 0, xc+size/2, yc-size/2, 0, xc-size/2, yc-size/2, 0}; drawScreen(verts, robotTex); } end2D() pops the stored projection and model view matrices from their stacks and restores them: private void end2D() // switch back to 3D viewing { gl.glEnable(GL.GL_DEPTH_TEST); gl.glMatrixMode(GL.GL_PROJECTION); gl.glPopMatrix(); // restore previous projection settings gl.glMatrixMode(GL.GL_MODELVIEW); gl.glPopMatrix(); // restore previous model view settings } // end of end2D()

them by the corresponding elements from the ColorSourceBlend value. It then repeats this with the color of the pixel already present on the screen, multiplying it by the ColorDestinationBlend elements. With these two colors calculated, they are combined using the appropriate ColorBlendFunction. We will look at all the available options for them in a moment, but before we do that let s pick a simple example to demonstrate this calculation. One of the available blend types is Blend.One, which provides the value 1.0 for each of the red, green, blue, and alpha color elements. Another factor is Blend.Zero, which provides the value 0.0 for each color component. Finally we have a blend function named BlendFunction.Add which simply adds the source and the destination color element values together. If we use Blend.One as the source blend, Blend.Zero as the destination blend, and BlendFunction.Add as the blend function, the color for each pixel is calculated as follows: Rednew Green new Blue new = (Redsource x 1.0) = (Green source x 1.0) = (Blue source x 1.0) + + + (Reddest x 0.0) (Green dest x 0.0) (Blue dest x 0.0)

refers to the strategy deployed by MySQL when it does a sequential scan of all the key entries in an index This access type is usually seen only when both of the following two conditions exist: No WHERE clause is specified or the table in question does not have an index that would speed up data retrieval (see the preceding discussion of the range access type) All columns used in the SELECT statement for this table are available in the index This is called a covering index To see an example, let s go back to Listing 7-33, where we continued to see MySQL use an ALL access type, even though an index was available on columns in the WHERE condition The ALL access type indicates that a sequential scan of the table data is occurring.

The floor consists of a series of green and blue tiles in a checkerboard pattern, a single red square over the origin, and x- and z- axes labels: // globals private final static int BLUE_TILE = 0; private final static int GREEN_TILE = 1; private void drawFloor() { gl.glDisable(GL.GL_LIGHTING); drawTiles(BLUE_TILE); drawTiles(GREEN_TILE); addOriginMarker(); labelAxes(); gl.glEnable(GL.GL_LIGHTING); // end of CheckerFloor() // floor tile color types

As you can see, the end result if these blending parameters are used is that the object is rendered absolutely opaque; no blending takes place at all. The output colors calculated are exactly the same as the source colors, with the existing destination color completely ignored. This is in fact the configuration that is provided by the BlendState.Opaque object. The code to configure this blend state is shown in Listing 6 27. Listing 6 27. Manually configuring a BlendState object for opaque blending // Create a new BlendState object BlendState blendState = new BlendState(); // Set the color blend properties blendState.ColorBlendFunction = BlendFunction.Add; blendState.ColorSourceBlend = Blend.One; blendState.ColorDestinationBlend = Blend.Zero; // Copy the color blend properties to the alpha blend properties blendState.AlphaBlendFunction = blendState.ColorBlendFunction; blendState.AlphaSourceBlend = blendState.ColorSourceBlend; blendState.AlphaDestinationBlend = blendState.ColorDestinationBlend; // Set the object into the GraphicsDevice GraphicsDevice.BlendState = blendState;

The reason the table data is being sequentially scanned is because of the SELECT *, which means that all table columns in CustomerOrder are used in the SELECT statement Watch what happens if we change the statement to read SELECT ordered_on, so that the only column used in the SELECT statement is available in the index on ordered_on, and we remove the WHERE clause to force a scan, as shown in Listing 7-35 Listing 7-35 Example of the index Access Type mysql> EXPLAIN -> SELECT ordered_on -> FROM CustomerOrder co \G *************************** 1 row *************************** id: 1 select_type: SIMPLE table: co type: index possible_keys: NULL key: ordered_on key_len: 3 ref: NULL rows: 6 Extra: Using index 1 row in set (000 sec) Notice that in the Extra column of the EXPLAIN output, you see Using index.

NOTE The initial configuration of a newly instantiated BlendState object is exactly the same as that of the builtin BlendState.Opaque object.

The trick to tiles creation is the calculation of their coordinates. Figure 16-16 shows a simplified view of the floor from above (B is for blue tile, G for green).