如何提高 Direct3D 流纹理性能？

发布于 2024-10-16 15:13:35 字数 981 浏览 5 评论 0原文

我正在尝试加速全屏纹理的绘制，该纹理会改变每一帧。在我的系统上，使用 GDI 和 BitBlt() 可以获得大约 1000 FPS，但我认为可以通过使用 Direct3D 和动态纹理来提高性能。相反，我只能获得 250 FPS 左右。

我在配备 ATI HD 4870 和最新驱动程序的 Mac Pro 上运行。

我尝试过使用动态纹理，这给了我一个小的增益（~15FPS），我尝试过使用纹理链来避免管道停顿，但这没有效果。

我环顾四周，关于以这种方式使用动态纹理的信息很少。

我错过了一些基本的东西吗？

设备设置：

pparams.BackBufferCount = 1;
pparams.SwapEffect = D3DSWAPEFFECT_DISCARD;
pparams.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;

纹理创建：

device->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC,
                      D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &texture, NULL);

纹理更新：

texture->LockRect(0, &locked, NULL, D3DLOCK_DISCARD);
... write texture data
texture->UnlockRect(0);
device->DrawPrimitiveUP(D3DPT_TRIANGLEFAN, 2, vertices, sizeof(*vertices));
...

您可以从以下位置获取正在进行的代码 http://www.libsdl.org/tmp/SDL-1.3.zip

谢谢！

原文

I'm trying to accelerate the drawing of a full-screen texture which changes every frame. On my system, I can get around 1000 FPS using GDI and BitBlt(), but I thought I could improve performance by using Direct3D and dynamic textures. Instead I'm only getting around 250 FPS.

I'm running on a Mac Pro with an ATI HD 4870 with current drivers.

I've tried using dynamic textures and that gives me a small gain (~15FPS) and I've tried using a texture chain to avoid pipeline stalls and that has no effect.

I've looked around quite a bit and there's very little information on using dynamic textures this way.

Am I missing something fundamental?

Device Setup:

pparams.BackBufferCount = 1;
pparams.SwapEffect = D3DSWAPEFFECT_DISCARD;
pparams.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;

Texture create:

device->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC,
                      D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &texture, NULL);

Texture update:

texture->LockRect(0, &locked, NULL, D3DLOCK_DISCARD);
... write texture data
texture->UnlockRect(0);
device->DrawPrimitiveUP(D3DPT_TRIANGLEFAN, 2, vertices, sizeof(*vertices));
...

You can get the work in progress code from
http://www.libsdl.org/tmp/SDL-1.3.zip

Thanks!

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