public static void Begin(GraphicsDevice gd, int width, int height)
{
Debug.Assert(batchMode == BatchMode.None, "Bad batch mode: " + batchMode);
matrixStack.Clear();
matrix = Matrix.Identity;
drawColor = Color.White;
blendMode = AppBlendMode.AlphaBlend;
samplerState = SamplerState.LinearClamp;
if (graphicsDevice != gd)
{
graphicsDevice = gd;
spriteBatch = new SpriteBatch(graphicsDevice);
basicEffect = new BasicEffect(graphicsDevice);
worldMatrix = Matrix.Identity;
viewMatrix = Matrix.CreateLookAt(new Vector3(0.0f, 0.0f, 1.0f), Vector3.Zero, Vector3.Up);
projection = Matrix.CreateOrthographicOffCenter(0.0f, width, height, 0, 1.0f, 1000.0f);
basicEffect.World = worldMatrix;
basicEffect.View = viewMatrix;
basicEffect.Projection = projection;
basicEffect.VertexColorEnabled = true;
rasterizerState = new RasterizerState();
rasterizerState.CullMode = CullMode.None;
}
}
public static void SetBlendMode(AppBlendMode mode)
{
if (blendMode != mode)
{
blendMode = mode;
EndBatch();
}
}
private static BlendState toBlendState(AppBlendMode mode)
{
switch (mode)
{
case AppBlendMode.AlphaBlend:
return(BlendState.AlphaBlend);
case AppBlendMode.Additive:
return(BlendState.Additive);
case AppBlendMode.Opaque:
return(BlendState.Opaque);
case AppBlendMode.NonPremultiplied:
return(BlendState.NonPremultiplied);
default:
throw new NotImplementedException();
}
}
private static void BeginSpriteBatch(SpriteBatch sb, AppBlendMode blendMode, Matrix m, BatchMode mode)
{
Debug.Assert(mode != BatchMode.None);
if (mode == BatchMode.Sprite)
{
BlendState blendState = toBlendState(blendMode);
sb.Begin(SpriteSortMode.Immediate, blendState, samplerState, null, rasterizerState, drawEffect == null ? null : drawEffect.Effect, m);
}
else if (mode == BatchMode.BasicEffect)
{
basicEffect.World = Matrix.Multiply(worldMatrix, m);
basicEffect.CurrentTechnique.Passes[0].Apply();
}
else if (mode == BatchMode.CustomEffect)
{
customEffect.Parameters["World"].SetValue(Matrix.Multiply(worldMatrix, m));
customEffect.Parameters["View"].SetValue(viewMatrix);
customEffect.Parameters["Projection"].SetValue(projection);
customEffect.CurrentTechnique.Passes[0].Apply();
}
batchMode = mode;
}