directx

问题 i want to apply a shader to a bitmap (offline processing) with sharpdx. I found a sample on SharpDX homepage to apply an effect to an image with offline processing. Now i want to apply a shader.fx to it but i don't know how to do it. Can anyone help me out? Here are the code snipset: // Effect 1 : BitmapSource - take decoded image data and get a BitmapSource from it var bitmapSourceEffect = new d2.Effects.BitmapSource(d2dContext); bitmapSourceEffect.WicBitmapSource = formatConverter; //

问题 According to the documentation http://msdn.microsoft.com/en-us/library/windows/desktop/ff476635(v=vs.85).aspx ID3D11Texture2D inherits from the ID3D11Resource. I tried the following but it gives a std:non-rtti exception. ID3D11Texture2D *tex2d = dynamic_cast<ID3D11Texture2D*>(resource); 回答1: Since ID3D11Texture2D is a COM interface you should use QueryInterface to get other interfaces the object might support. Something like this: HRESULT hr = resource->QueryInterface(IID_ID3D11Texture2D,

问题 I am encountering a strange issue I think involves D3D11CreateDeviceAndSwapChain I can create the device and swap chain however when the application exits and ->destroy gets called on the swap chain, device, and device context a thread is still running. Commenting out this line the application terminates as expected. featureLevel = D3D_FEATURE_LEVEL_11_0; result = D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL, 0, &featureLevel, 1, D3D11_SDK_VERSION, &swapChainDesc, &m

问题 I tried to create this 2D triangle in with the Input Assembler set to triangle strip: 1.(0.0f, 0.0f, 0.5f) 2.(-0.5f, 0.0f, 0.5f) 3.(-0.5f, -0.5f, 0.5f) However, no triangle was drawn, in fact nothing was drawn on the render target, not even a single line. I messed around, and then I swapped coordinates 2 and 3 , and it worked. The triangle was drawn just as I intended it to be. What is the reason for this odd behaviour? 回答1: You define your vertex in counter-clockwise order, and Direct3D will

问题 I have circle in 3D space (red on image) with normals (white) This circle is being drawn as linestrip. Problem is: i need to draw only those pixels whose normals directed into camera (angle between normal and camera vector is < 90) using discard in fragment shader code. Like backface culling but for lines. Red part of circle is what i need to draw and black is what i need to discard in fragment shader. Good example is 3DS Max rotation gizmo, back sides of lines are hidden: So, in fragment

问题 Why does calling the inherited IUnknown::Release() function on a IWICImagingFactory object in a destructor cause a "CXX0030: Error: expression cannot be evaluated" to be shown each entry in the object's virtual function table (__vfptr)? This is in reference to an earlier question I posted but I've since realized that the problem only occurs in the destructor. The virtual function table appears valid anywhere else I have checked. However, once in the destructor all entries are shown with the

问题 I'm kinda learning Direct3D and have this quite basic code, nothing too fancy. During debugging in Visual Studio I noticed a constantly increasing memory usage, which is kinda weird. From what I observed, IDXGISwapChain::Present allocates new memory blocks with each frame update. Here is a difference between two memory snapshots, about 7 second difference. I have no idea what could be the cause of this, maybe I forgot to call some sort of clearing function? And I don't even have any buffers

问题 What is the fastest way to capture a screenshot in Windows? A driver? Using DirectX? 回答1: The fastest way would be to read mapped region of video card memory I think... Just an idea, never tried that. 回答2: A while back I timed the win32 api and the .net wrapper. Here is the complete blog post: http://blog.bobcravens.com/2009/04/fastest-screen-capture-using-c-vista-vs-win7/ The upshot is that the .net wrapper in the latest version of Win7 is as fast as the native win32 api. I have never tried

问题 I try to render the scene to texture which should be then displayed in corner of the screen. I though that I can do that this way: Render the scene (my Engine::render() method that will set shaders and make draw calls) - works ok . Change render target to the texture. Render the scene again - does not work. The context->ClearRenderTargetView(texture->getRenderTargetView(), { 1.0f, 0.0f, 0.0f, 1.0f } ) does set my texture to red color (for scene in step 1. I use different color), but none

问题 I am trying to write an HLSL pixel shader for a project I am working on. Basically want I want to do is if a texture has a pixel with a float value of 0.52 (on scale of 0-255 is 132.6) I want to output 133 60% of the time and output 132 40% of the time. Write now I am just trying to output the fractional remainder of the RGB value (i.e. the chance to bump the pixel up) however I always get a value of zero) I think this is because the colors are getting quantized to a 0-255 scale before they