Hey, sorry for the late reply.
I’m using a linear clamp.
It would be a bit difficult to split out the code from my project and put it up here, so I’ve modified a test project that uses the stock SpriteBatch with the same AlphaTestEffect used by DrawUserIndexedPrimitives to draw lines and still illistrates the problems I am having with the matrices:
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
namespace WithVertexAlpha
{
/// <summary>
/// This is the main type for your game.
/// </summary>
public class WithVertexAlphaGame : Game
{
Matrix worldMatrix;
Matrix viewMatrix;
Matrix projectionMatrix;
BasicEffect basicEffect;
VertexDeclaration vertexDeclaration;
VertexPositionColor[] PointList;
short[] lineListIndices;
RasterizerState rasterizerState;
GamePadState currentGamePadState;
GamePadState lastGamePadState;
KeyboardState currentKeyboardState;
KeyboardState lastKeyboardState;
GraphicsDeviceManager graphics;
public WithVertexAlphaGame()
{
graphics = new GraphicsDeviceManager(this);
graphics.IsFullScreen = false;
graphics.PreferredBackBufferHeight = 1080;
graphics.PreferredBackBufferWidth = 1920;
Window.IsBorderless = true;
Content.RootDirectory = "Content";
}
protected override void Initialize()
{
InitializeTransform();
InitializeEffect();
rasterizerState = new RasterizerState();
rasterizerState.FillMode = FillMode.WireFrame;
rasterizerState.CullMode = CullMode.None;
base.Initialize();
}
SpriteBatch sb;
AlphaTestEffect alphaTestEffect;
Texture2D t2D;
protected override void LoadContent()
{
sb = new SpriteBatch(GraphicsDevice);
alphaTestEffect = new AlphaTestEffect(GraphicsDevice);
alphaTestEffect.World = worldMatrix;
alphaTestEffect.View = viewMatrix;
alphaTestEffect.Projection = projectionMatrix;
t2D = Content.Load<Texture2D>("TestTexture");
// TODO: use this.Content to load your game content here
}
protected override void UnloadContent()
{
// TODO: Unload any non ContentManager content here
}
private void InitializeTransform()
{
worldMatrix = Matrix.CreateTranslation(0.5f, 0.5f, 0f);
//worldMatrix = Matrix.Identity;
viewMatrix = Matrix.CreateLookAt(
new Vector3(0, 0, 1),
new Vector3(0, 0, 0),//Vector3.Zero,
Vector3.Up
);
projectionMatrix =
Matrix.CreateOrthographicOffCenter(
0, //Left
(float)GraphicsDevice.Viewport.Width, //Right
(float)GraphicsDevice.Viewport.Height , //Bottom
0, //Top
0f, //zNearPlane
1f //zFarPlane
);
}
AlphaTestEffect vertexEffectWithAlpha;
private void InitializeEffect()
{
vertexDeclaration = new VertexDeclaration(new VertexElement[]
{
new VertexElement(0, VertexElementFormat.Vector3, VertexElementUsage.Position, 0),
new VertexElement(12, VertexElementFormat.Color, VertexElementUsage.Color, 0)
}
);
basicEffect = new BasicEffect(GraphicsDevice);
basicEffect.VertexColorEnabled = true;
basicEffect.World = worldMatrix;
basicEffect.View = viewMatrix;
basicEffect.Projection = projectionMatrix;
Texture2D pixel = new Texture2D(GraphicsDevice, 2, 1, false, SurfaceFormat.Color);
pixel.SetData(new[] { Color.White, Color.Transparent });
vertexEffectWithAlpha = new AlphaTestEffect(GraphicsDevice);
vertexEffectWithAlpha.Texture = pixel;
vertexEffectWithAlpha.VertexColorEnabled = true;
vertexEffectWithAlpha.World = worldMatrix;
vertexEffectWithAlpha.View = viewMatrix;
vertexEffectWithAlpha.Projection = projectionMatrix;
//vertexEffectWithAlpha.;
}
protected override void Update(GameTime gameTime)
{
// Allows the game to exit
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
this.Exit();
#if WINDOWS
if (Keyboard.GetState().IsKeyDown(Keys.Escape))
this.Exit();
#endif
base.Update(gameTime);
}
int FrameCount = 0;
VertexPositionColorTexture[] PointListWithTexture;
protected override void Draw(GameTime gameTime)
{
#region Vertices
PointList = new VertexPositionColor[100];
//Top left corner lines
PointList[0] = new VertexPositionColor(new Vector3(1, 0, 1), Color.Red);
PointList[1] = new VertexPositionColor(new Vector3(200, 0, 1), Color.Red);
PointList[2] = new VertexPositionColor(new Vector3(0, 1, 1), Color.Green);
PointList[3] = new VertexPositionColor(new Vector3(0, 200, 1), Color.Green);
//Middle to edge stuff
PointList[4] = new VertexPositionColor(new Vector3(200, 200, 1), Color.Black);
PointList[5] = new VertexPositionColor(new Vector3(1520 - 1, 200, 1), Color.Red);// new Color(255, 0, 0, 50));// Color.White);
PointList[6] = new VertexPositionColor(new Vector3(200, 1080 - 1, 1), Color.White);
//Right edge stuff
PointList[7] = new VertexPositionColor(new Vector3(1920 - 1, 0, 0), Color.Red);
PointList[8] = new VertexPositionColor(new Vector3(1920 - 1, 150, 0), Color.Red);
//Render target stuff
PointList[9] = new VertexPositionColor(new Vector3(0, 0, 1), Color.Purple);
PointList[10] = new VertexPositionColor(new Vector3(10, 10, 1), Color.Purple);
PointList[11] = new VertexPositionColor(new Vector3(2, 400, 1), Color.Blue);
PointListWithTexture = new VertexPositionColorTexture[PointList.Length];
for (int index = 0; index < PointListWithTexture.Length; index++ )
{
VertexPositionColor point = PointList[index];
PointListWithTexture[index] = new VertexPositionColorTexture(point.Position, point.Color, new Vector2(1f - (point.Color.A * (1f / 255f)), 0));
}
#endregion
#region Indices
lineListIndices = new short[PointList.Length * 2];
//Top left corner lines
lineListIndices[0] = 0;
lineListIndices[1] = 1;
lineListIndices[2] = 2;
lineListIndices[3] = 3;
//Middle to edge stuff
lineListIndices[4] = 4;
lineListIndices[5] = 5;
lineListIndices[6] = 4;
lineListIndices[7] = 6;
//Right edge
lineListIndices[8] = 7;
lineListIndices[9] = 8;
lineListIndices[10] = 9;
lineListIndices[11] = 10;
lineListIndices[12] = 11;
#endregion
FrameCount++;
//RenderTarget2D r2D = new RenderTarget2D(GraphicsDevice, 600, 600, false, SurfaceFormat.Color, DepthFormat.Depth24);
//GraphicsDevice.SetRenderTarget(r2D);
//GraphicsDevice.Clear(new Color(109, 0, 0, 100));
//Draw_Vertices(PointList, PointList.Length, lineListIndices, 0, 5);
//sb.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend, SamplerState.LinearClamp, DepthStencilState.Default, RasterizerState.CullNone, alphaTestEffect);
//sb.Draw(t2D, new Rectangle(700, 198, 617, 107), null, Color.White, 0, new Vector2(0, 0), SpriteEffects.None, 0.5f);
//sb.End();
//GraphicsDevice.SetRenderTarget(null);
GraphicsDevice.Clear(Color.SteelBlue);
Draw_Vertices(PointList, PointList.Length, lineListIndices, 0, 6);
sb.Begin(SpriteSortMode.Deferred, null, SamplerState.LinearClamp, null, null, vertexEffectWithAlpha);
//sb.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend, SamplerState.LinearClamp, DepthStencilState.Default, RasterizerState.CullNone, alphaTestEffect);
sb.Draw(t2D, new Rectangle(20, 20, 417, 107), null, Color.White, 0, new Vector2(0, 0), SpriteEffects.None, 0.5f);
////sb.Draw(r2D, new Rectangle(20, 20, 600, 600), null, Color.White, 0, new Vector2(0, 0), SpriteEffects.None, 1f);
sb.End();
//Draw_Vertices(PointListWithTexture, PointList.Length, lineListIndices, 0, 5);
base.Draw(gameTime);
}
private void Draw_Vertices(VertexPositionColorTexture[] vertexData, int numVertices, short[] indices, int firstIndex, int primitiveCount)
{
foreach (EffectPass pass in vertexEffectWithAlpha.CurrentTechnique.Passes)
{
pass.Apply();
GraphicsDevice.BlendState = BlendState.AlphaBlend;
DrawLineList(vertexData, numVertices, indices, firstIndex, primitiveCount);
}
}
private void Draw_Vertices(VertexPositionColor[] vertexData, int numVertices, short[] indices, int firstIndex, int primitiveCount)
{
foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
{
pass.Apply();
DrawLineList(vertexData, numVertices, indices, firstIndex, primitiveCount);
}
}
private void DrawLineList(VertexPositionColorTexture[] vertexData, int numVertices, short[] indices, int firstIndex, int primitiveCount)
{
GraphicsDevice.DrawUserIndexedPrimitives<VertexPositionColorTexture>(
PrimitiveType.LineList,
vertexData, //
0, // vertex buffer offset to add to each element of the index buffer
numVertices, // number of vertices in pointList
indices, // // the index buffer
firstIndex, // first index element to read
primitiveCount // number of primitives to draw
);
}
private void DrawLineList(VertexPositionColor[] vertexData, int numVertices, short[] indices, int firstIndex, int primitiveCount)
{
GraphicsDevice.DrawUserIndexedPrimitives<VertexPositionColor>(
PrimitiveType.LineList,
vertexData, //
0, // vertex buffer offset to add to each element of the index buffer
numVertices, // number of vertices in pointList
indices, // // the index buffer
firstIndex, // first index element to read
primitiveCount // number of primitives to draw
);
}
}
}
The test sprite is:
Again to clarify the problem I am looking to create Matrices for an effect so that primitives that have that effect applied to appear relative to the top left of the screen (0,0 would be the top left pixel and Viewport.Width-1,Viewport.Height-1 would be the bottom right pixel) and doesn’t blur the pixels of the texture when drawing quads with the effect.
Cheers!
