Direct3D 纹理后处理/复制
因此，我尝试实现一些 Direct3D 后处理，但在渲染纹理时遇到问题。基本上，我的程序看起来像这样：
// Render scene to "scene_texture" (an HDR texture)...
...
device->SetRenderTarget(0, brightpass_surface);
device->SetTexture(0, scene_texture);
// Render "scene_texture" to "brightpass_texture" using full-screen quad.
// This involves passing the quad geometry through a brightpass shader.
...
device->SetRenderTarget(0, ldr_surface);
device->SetTexture(0, brightpass_texture);
// Render "brightpass_texture" to "ldr_surface" using full-screen quad...
我遗漏了一些部分，因为有相当数量的代码（我只是想了解总体思路）。不幸的是，上述结果会导致空白屏幕。这是我想要发生的事情：
- 将场景渲染到纹理（HDR）
- 通过 Brightpass 着色器将该纹理渲染到第二个纹理
- 将第二个纹理渲染到可见的 LDR 表面
请注意，如果我将上面的最后一行从 更改
device->SetTexture(0, brightpass_texture);
为
device->SetTexture(0, scene_texture);
那么一切正常。请注意，我尝试跳过 Brightpass 着色器并简单地传递像素，但这也不起作用。
So I'm trying to implement some Direct3D post-processing, and I'm having issues rendering to textures. Basically, my program looks like this:
// Render scene to "scene_texture" (an HDR texture)...
...
device->SetRenderTarget(0, brightpass_surface);
device->SetTexture(0, scene_texture);
// Render "scene_texture" to "brightpass_texture" using full-screen quad.
// This involves passing the quad geometry through a brightpass shader.
...
device->SetRenderTarget(0, ldr_surface);
device->SetTexture(0, brightpass_texture);
// Render "brightpass_texture" to "ldr_surface" using full-screen quad...
I've left out some parts b/c there is a fair amount of code (I'm just trying to get across the general idea). Unfortunately, the above results in a blank screen. Here is what I want to happen:
- Render scene to a texture (HDR)
- Render that texture to a second texture THROUGH a brightpass shader
- Render the second texture to the visible LDR surface
Note that if I change the last line above from
device->SetTexture(0, brightpass_texture);
to
device->SetTexture(0, scene_texture);
Then everything works. Note that I've tried skipping the brightpass shader and simply passing the pixels through, but that doesn't work either.
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评论（3）
问题是多重采样。在
D3DPRESENT_PARAMS结构中，我启用了多重采样。在启用多重采样时，您无法使用“全屏四边形”技术从一个浮点纹理渲染到另一个浮点纹理。相反，我在 HDR 场景渲染目标 (
scene_texture) 中启用多重采样，并在PRESENT_PARAMS结构中禁用它。这很好，因为我只需要多重采样来进行场景渲染。The problem was multisampling. In the
D3DPRESENT_PARAMSstructure, I had enabled multisampling. You can't render from one floating point texture into another floating point texture using the "full-screen quad" technique while multisampling is enabled.Instead, I enabled multisampling in the HDR scene render target (
scene_texture) and disabled it in thePRESENT_PARAMSstructure. This is good because I only needed multisampling for the scene rendering.您是否确定使用渲染到纹理标志创建了 Brightpass_texture？
Did you make sure you created the brightpass_texture with a render-to-texture flag?
调试运行时是否会出现任何错误？你如何获得ldr_surface？
如果将场景直接渲染到 ldr_surface 并绕过所有 HDR 内容，会发生什么？事情可能看起来有点饱和，但它应该给你一个想法......
Does the debug runtime spew any errors out? How do you get ldr_surface?
What happens if you render your scene straight to ldr_surface and bypass all the HDR stuff? Thing will probably look a bit saturated but it should give you an idea ...