Question

我正在使用等轴测视图创建游戏。我有一个结构，目前使用两个矩阵非常有效。但是，这需要我想要做的其他成员和功能。其中一个SpriteBatch.Begin函数接受转换矩阵作为参数。我想写一个新的SpriteBatch.Begin函数来接受两个矩阵（一个用于相机变换，一个用于等距变换）。我不知道实际的SpriteBatch.Begin函数是如何工作的，我不知道是否有任何可用的源。有没有人有想法？

Answer 1

好的，编辑后我搜索了SpriteBatch.begin（）的源代码功能。我找到了monogame的源代码，它是XNA的开源实现。

所以这是：

using System;
using System.Text;

namespace Microsoft.Xna.Framework.Graphics
{
    public class SpriteBatch : GraphicsResource
    {
        readonly SpriteBatcher _batcher;

            SpriteSortMode _sortMode;
            BlendState _blendState;
            SamplerState _samplerState;
            DepthStencilState _depthStencilState; 
            RasterizerState _rasterizerState;                
            Effect _effect;
            bool _beginCalled;

            Effect _spriteEffect;
            readonly EffectParameter _matrixTransform;
            readonly EffectPass _spritePass;

            Matrix _matrix;
            Rectangle _tempRect = new Rectangle (0,0,0,0);
            Vector2 _texCoordTL = new Vector2 (0,0);
            Vector2 _texCoordBR = new Vector2 (0,0);

            public SpriteBatch (GraphicsDevice graphicsDevice)
            {
                if (graphicsDevice == null) 
                {
                        throw new ArgumentException ("graphicsDevice");
                }        

                this.GraphicsDevice = graphicsDevice;

                // Use a custom SpriteEffect so we can control the transformation matrix
                _spriteEffect = new Effect(graphicsDevice, SpriteEffect.Bytecode);
                _matrixTransform = _spriteEffect.Parameters["MatrixTransform"];
                _spritePass = _spriteEffect.CurrentTechnique.Passes[0];

                _batcher = new SpriteBatcher(graphicsDevice);

                _beginCalled = false;
            }

            public void Begin ()
            {
                Begin(SpriteSortMode.Deferred, BlendState.AlphaBlend, SamplerState.LinearClamp, DepthStencilState.None, RasterizerState.CullCounterClockwise, null, Matrix.Identity);        
            }

            public void Begin (SpriteSortMode sortMode, BlendState blendState, SamplerState samplerState, DepthStencilState depthStencilState, RasterizerState rasterizerState, Effect effect, Matrix transformMatrix)
            {
                if (_beginCalled)
                    throw new InvalidOperationException("Begin cannot be called again until End has been successfully called.");

                // defaults
                _sortMode = sortMode;
                _blendState = blendState ?? BlendState.AlphaBlend;
                _samplerState = samplerState ?? SamplerState.LinearClamp;
                _depthStencilState = depthStencilState ?? DepthStencilState.None;
                _rasterizerState = rasterizerState ??   RasterizerState.CullCounterClockwise;

                _effect = effect;

                _matrix = transformMatrix;

                // Setup things now so a user can chage them.
                if (sortMode == SpriteSortMode.Immediate)
                    Setup();

                _beginCalled = true;
            }

            public void Begin (SpriteSortMode sortMode, BlendState blendState)
            {
                Begin (sortMode, blendState, SamplerState.LinearClamp, DepthStencilState.None, RasterizerState.CullCounterClockwise, null, Matrix.Identity);                        
            }

            public void Begin (SpriteSortMode sortMode, BlendState blendState, SamplerState samplerState, DepthStencilState depthStencilState, RasterizerState rasterizerState)
            {
                Begin (sortMode, blendState, samplerState, depthStencilState, rasterizerState, null, Matrix.Identity);        
            }

            public void Begin (SpriteSortMode sortMode, BlendState blendState, SamplerState samplerState, DepthStencilState depthStencilState, RasterizerState rasterizerState, Effect effect)
            {
                Begin (sortMode, blendState, samplerState, depthStencilState, rasterizerState, effect, Matrix.Identity);                        
            }

            public void End ()
            {        
                _beginCalled = false;

                if (_sortMode != SpriteSortMode.Immediate)
                        Setup();

#if PSM   
        GraphicsDevice.BlendState = _blendState;
        _blendState.ApplyState(GraphicsDevice);
#endif

        _batcher.DrawBatch(_sortMode);
    }

文件不完整，我没有在结束函数后粘贴但是如果你想读取整个文件。链接是：https://github.com/mono/MonoGame/blob/7ec1ec8a0e924eca60588e770121ed3e2593e74d/MonoGame.Framework/Graphics/SpriteBatch.cs

我希望这是你要找的源代码。

祝你好运！

这是我的另一个答案：

您需要在主Draw（）函数中调用spriteBatch.Begin（）和spriteBatch.End（），以便实际绘制。

以下是一个例子：

Game1.cs中的Draw（）函数：

protected override void Draw(GameTime gameTime)
{
    GraphicsDevice.Clear(Color.CornflowerBlue);

    // Start drawing
    spriteBatch.Begin();

    player.Draw(spriteBatch);

    // Stop drawing
    spriteBatch.End();

    base.Draw(gameTime);
}

Player.cs中的Draw（）函数：

public void Draw(SpriteBatch spriteBatch)
{
    spriteBatch.Draw(playerTexture, playerPosition, null, Color.White, 0f, Vector2.Zero, 1f, SpriteEffects.None, 1f);
}

这将使用Player.cs中的Draw（）函数将播放器绘制到屏幕上。 spriteBatch在Game1.cs的LoadContent（）函数中初始化。

我希望这有助于！

Answer 2

您可以为对象创建自己的“绘图”，并在“Game1.cs”的“绘图”中调用它们。

示例：

protected override void Draw(GameTime gameTime){

myObject.Draw(gameTime);

}

希望这有帮助！

是否可以编写新的SpriteBatch.Begin函数？

2 个答案: