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POHow to bypass SpriteBatch sorting? C# XNA
 

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  1. POHow to bypass SpriteBatch sorting? C# XNA
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    <p>I am working on a "falling sand" game in XNA. Of course, that means lots and lots of pixels must be drawn! It started fine, using a transparent blue color per pixel purely for testing algorithms. I was able to draw about 100,000 pixels to the screen before losing any frame rate (a steady 60 FPS), which was more than I needed! However, when I finally added a different color pixel (blue and red) and no other changes, my FPS dropped exponentially, only allowing for about 10,000 pixels to be drawn to the screen before FPS dropped to about 10. After experimenting some, I concluded that the sprite batch was most likely at fault, although I could be completely wrong and please let me know if you think of something different, because the sprite batch automatically sorts and blends the pixels together. I assume the act of blending the two colors together is where I am losing speed. So, how could I get around the sprite batch's methods? Or am I completely off base?</p> <p>I've tried messing with SpriteSortMode and BlendMode, and even only drawing like colored pixels per sprite batch call, but no luck so far.</p> <p>Also, the pixels I am drawing to the screen never have the same coordinates to begin with, so blending and the like is not needed.</p> <pre><code> //Game Draw Method protected override void Draw(GameTime gameTime) { stopWatch.Start(); GraphicsDevice.Clear(Color.Black); spriteBatch.Begin(); //backgroundSprite.Draw(spriteBatch); terrainSprite.Draw(spriteBatch); resourceMap.Draw(spriteBatch, spriteFont); frameCounter++; string fps = string.Format("fps: {0}", frameRate); int totalint = 0; for (int i = 0; i &lt; resourceMap.activeCoordinates.Count; i++) { totalint += resourceMap.activeCoordinates[i].Count; } string total = string.Format("resource count: {0}", totalint); spriteBatch.DrawString(spriteFont, fps, new Vector2(33, 33), Color.White); spriteBatch.DrawString(spriteFont, total, new Vector2(33, 45), Color.White); spriteBatch.DrawString(spriteFont, totalTime, new Vector2(33, 17), Color.White); spriteBatch.DrawString(spriteFont, totalTime, new Vector2(33, 17), Color.White); spriteBatch.End(); stopWatch.Stop(); totalTime = "Draw Time: " + stopWatch.Elapsed; stopWatch = new Stopwatch(); base.Draw(gameTime); } //resourceMap.Draw(SpriteBatch spriteBatch, SpriteFont font) from Game Draw public void Draw(SpriteBatch spriteBatch, SpriteFont font) { //spriteBatch.End(); //this was originally one for loop to draw all pixels, but was separated to draw each different color pixel after discovering performance issue for (int c = 0; c &lt; activeCoordinates.Count(); c++) { //spriteBatch.Begin(); for (int i = 0; i &lt; activeCoordinates[c].Count; i++) { mapArray[(int)activeCoordinates[c][i].X][(int)activeCoordinates[c][i].Y].Draw(spriteBatch); } //spriteBatch.End(); } //spriteBatch.Begin(); spriteBatch.DrawString(font, timeInMilli, new Vector2(33, 0), Color.White); } </code></pre> <p>Again, the only change made to the code was adding different colors to the list of pixels to be drawn, so the code here was working great (100,000 pixels drawn at around 60fps) until I added an extra color.</p> <p>Thanks for the help!</p>
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    1. PO
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      1. PTAnswer
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    1. PTQuestion
    1. USColton
    1. USColton
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    1. PO
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    1. COThe code is as simple as a for loop with a draw method. It shouldn't help as much as the explanation, but there you go ^^.
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      1. POHow to bypass SpriteBatch sorting? C# XNA
      1. USColton
    2. COCan you add code for whatever `mapArray[][].Draw` is? Although it's worth pointing out that drawing each pixel as its own individual sprite is very likely the wrong solution to this anyway.
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      1. POHow to bypass SpriteBatch sorting? C# XNA
      1. USAndrew Russell
    3. COI think you may solve your problem by drawing tinted white pixels, which is one texture for all sand particles, but with different coloring. It might raise the framerate, though the problem may be in something else you haven't posted. But yes, drawing a one pixel texture for each sand particle is a terribly slow approach. Try googling *powder* game and how they did it.
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      1. POHow to bypass SpriteBatch sorting? C# XNA
      1. USuser1306322
 

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