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How to use a procedural texture in xna?

cache_hit Member since: 7/27/2009 From: Houston, TX

Posted - 9/30/2009 6:09:18 PM

I am generating the data for a 2D texture manually, and this data might change from frame to frame. Currently I just use a simple function to compute the texture, given below:


private void RenderTexture()
{
	for (int i = 0; i < 256; ++i)
	{
		for (int j = 0; j < 256; ++j)
		{
			int x = (int)(4.0f * (float)i / 256.0f);
			int y = (int)(4.0f * (float)j / 256.0f);
			textureData[i*256 + j] = gridColors[x, y];
		}
	}

	texture_.SetData<Color>(textureData, 0, 256 * 256, SetDataOptions.Discard);
}

So it basically contains a 5x5 grid of colors, and then just "scales" this value to fit into a larger texture.

In my Draw() method I then just call effect.Parameters["Texture"] = texture;

When I do this I get an error:

Additional information: The operation was aborted. You may not modify a resource that has been set on a device, or after it has been used within a tiling bracket.

I'm obviously just supposed to do things a bit differently, could someone clarify how I'm supposed to do this?

Thanks

------------------------------------------------------------
First differentiate, then integrate. This should give you the answer. And if all else fails, let epsilon > 0.

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ColdEquation Member since: 8/15/2009 From: San Juan Capistrano, CA, United States

Posted - 10/1/2009 10:13:20 AM

The error you are getting is that the texture is currently in use. You can make sure that nothing is using your texture by clearing the texture registers before calling SetData. The texture registers can be set directly with GraphicsDevice.Textures[], which contains GraphicsDevice.GraphicsDeviceCapabilities.MaxSimultaneousTextures registers.

That said, you might want to move this code to a shader, and change your dynamic texture to a render target. Event shader model 2.0 can handle 25 colors as effect parameters, and it would save your CPU from having to loop through the pixels.

Finally, if this texture is only ever going to display 5x5 color blocks, you might just want to write a material shader that chooses the grid color procedurally from the uv's, rather than sampling a texture.

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cache_hit Member since: 7/27/2009 From: Houston, TX

Posted - 10/1/2009 11:05:47 AM

Quote:
Original post by ColdEquation
The error you are getting is that the texture is currently in use. You can make sure that nothing is using your texture by clearing the texture registers before calling SetData. The texture registers can be set directly with GraphicsDevice.Textures[], which contains GraphicsDevice.GraphicsDeviceCapabilities.MaxSimultaneousTextures registers.

That said, you might want to move this code to a shader, and change your dynamic texture to a render target. Event shader model 2.0 can handle 25 colors as effect parameters, and it would save your CPU from having to loop through the pixels.

Finally, if this texture is only ever going to display 5x5 color blocks, you might just want to write a material shader that chooses the grid color procedurally from the uv's, rather than sampling a texture.

It's eventually going to be more complicated, as I'm going to be writing text into each grid cell as well. It's also eventually going to write color grids that are layed out differently, the 5x5 was just a simple example so that I could get a proof of concept. I'll look into the GraphicsDevice.Textures[] member, thanks!

------------------------------------------------------------
First differentiate, then integrate. This should give you the answer. And if all else fails, let epsilon > 0.

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