DirectX is a set of multimedia APIs from Microsoft aimed primarily at game developers. Popular APIs within the DirectX collection include Direct3D, XInput, and XAudio.

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How can I draw multiple lines connected via “nodes” with SlimDX?

I currently read out XML data with the following scheme: Position x,y,z I try to add one new Vertex for each position node and add it to a Vertex array. Then I try to render this list of vertices so ...
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Mapping a Vertex Buffer in DirectX11

I have a VertexBuffer that I am remapping on a per frame base for a bunch of quads that are constantly updated, sharing the same material\index buffer but have different width/heights. However, ...
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What do you need to know in C++ before starting to program with DirectX

I was wondering what do you need to know in C++ before starting to program with DirectX? I have only been programming in C++ (more for 2D games using SDL and learning the basics) for just over a ...
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When to return a reference and when to return a copy?

I was looking at the d3dx math .h and noticed that a difference between the "+" and "+=" operators: D3DXVECTOR3& operator += ( CONST D3DXVECTOR3& ); D3DXVECTOR3 operator + ( CONST ...
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Is there any reason why there isn't a cross-platform implementation of DirectX?

Similar to how Mono can compile C# to various platforms, why isn't there an API that conforms to DirectX's specifications but can produce binaries for all platforms? I understand that there is OpenGL ...
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Teamviewer doesn't show my game screen

I've been building a 3D engine from scratch using C# and I've tried to show the result to a friend of mine using Teamviewer. When my demo game starts he doesn't see it. He can only see the last active ...
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Vertex Buffer Sharing between DirectX11 and Directx9

In my d3d9 engine i want to take benifit of compute shader of d3d11. So firstly I created a vertex buffer in d3d11 with D3D11_BIND_UNORDERED_ACCESS and then tried to create the d3d9 vertex buffer ...
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Matrix in constant buffer on the GPU contains NaNs but not on the CPU

I've got a shader with the following constant buffer: cbuffer ShaderParameters { matrix inverseViewProjectionMatrix; float4 cameraPosition; }; When using Visual Studio 2012's graphic ...
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What happens to a D3D11 application when Windows hibernates?

In D3D9 there was the concept of a "device reset". When a device reset occurred textures created with D3DPOOL_DEFAULT had to be recreated, but textures created with D3DPOOL_MANAGED didn't, because, ...
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Having the same texture data in different ID3D11Texture2D

Sorry if this has been answered elsewhere - I'm rather new to DX. My question concerns conservation of resources - specifically textures in VRAM. I assume that upon returning from a call to ...
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How to reconcile depth ordering with minimal shader context changes?

We generally want to minimise shader-program switches (glUseProgram and all associated context changes) for the sake of performance. AFAIK it is not uncommon to render by shader program, i.e. group ...
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How can I load .FBX files?

I am looking into options for the model assets for my game. I have gotten pretty good with Blender, and want to use C++/DirectX9 (don't need all the excess from 10+), but Blender 2.6 exports .fbx not ...
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Why can't I get a bool packed and aligned into a D3D constant buffer?

Alright, I'm having a hard time getting a bool packed and aligned into a hlsl constant buffer and I'm not sure why. Here is the buffer in hlsl cbuffer MaterialBuffer : register(b1) { float3 ...
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914 views

Converting from different handedness coordinate systems

I am currently porting a demo from XNA to DirectX which, as I understand it, both have coordinate systems with different handednesses. What are the things I need to bare in mind when converting ...
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Where have the cross and dot products gone in DirectX10?

In D3D9 there were functions to deal with D3DXVECTOR3's in order to calculate dot and cross products. However these have disappeared from the math library in D3D10. I assume they must have gone ...
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What is the “DirectX for Managed Code Update”?

I came upon this site while looking for information about working with DX in managed code and saw that MS released something containing a 'DirectX for Managed Code Update'. This sounds promising but ...
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loading 3d model data into buffers

I am using assimp to load 3d model data. I have noticed that each loaded model is made up of different meshes. I was wondering should each mesh have it's own vertex/index buffer or should there just ...
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WM_PAINT and Direct3D

I've seen people who've written in code where the graphics of a scene are rendered in response to WM_PAINT. I only ever rendered the scene once all Windows messages were done translating, and then ...
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Local shape color blending

I am trying to implement this in Unity 4 Pro. But I am stuck in the blending part. I don't understand how you could blend multiples textures/colors using multiples volumes on an object. How could you ...
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243 views

Gamepad thumbsticks active range

for my current project I use gamepad. I was successfull in hooking it up in C# through SlimDX. Everything works fine, only problem is that thumbsticks don't fully use the active range. If I move ...
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499 views

Implementing multithreaded loading screens

Ok, I have fairly little multi-threading experience, but i have done a similar thing before without issue...but this has me stumped. This is in C++, Directx9 Visual Studio... My game basically runs ...
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261 views

Per Instance Textures, and Vertex And Pixel Shaders?

How do you implement per instance textures, vertex shaders, and pixel shaders? Given: 1. Two different model templates in Vertex Buffer, Square & Triangle 2. Instance Buffer with [n] instances of ...
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CreateRenderTarget returns 0x80070057 in big surface resolution

I have created the SLI merged desktop of three 1920x1680 monitors, so the desktop resolution is 5760x1080. There is a 0x80070057 error, while calling CreateRenderTarget to create the RT_Surface: ...
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Pix for visual studio express 2012 (Desktop)

(Originally asked on stackoverflow) Using visual c++ express 2010 for direct3d you have to download the directX sdk and there is a tool called pix for debugging shaders, looking at 3d resources etc. ...
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D3DXMatrixDecompose gives different quaternion than D3DXQuaternionRotationMatrix

In trying to solve this problem, I tracked down the problem to the conversion of the rotation matrix to quaternion. In particular, consider the following matrix: -0.02099178 0.9997436 -0.008475631 0 ...
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SV_POSITION in pixel shader

What are the uses for SV_POSITION in the pixel shader? Previously this was the POSITION semantic and it wasn't readable in the pixel shader, but now that it is, what can it be used for? In an SM2 ...
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How do I create a decal system?

I'm currently given the task to design & create a simple decal-system in C++/DirectX. Does anybody know a great tutorial, article or paper to start with? (Especially the part about 2D-texture to ...
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How can I check for Shader Model 3 support?

Currently I am working on a 3D visualization app. A requirement of my app is that host's graphics card supports Shader Model 3. How can I check for Shader Model 3 support? I know that these versions ...
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Does the latest DirectX SDK support both Direct3D 9.0c and 11?

1) What is the latest version of DirectX SDK? 2) For my purposes I need DirectX 9.0c SDK and DirectX 11 SDK. Do I need to install these libraries separately or last DirectX SDK package contains both ...
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How do I plot individual pixels using the XNA APIs?

If I wanted to fill my game screen with individually coloured pixels, how would I do this? For example, if I wanted to write a 'game of life'-type game where each pixel was a cell, how would I ...
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How to fill/initialize D3D11_SAMPLER_DESC properly?

If I want to set explicitly every parameter of the structure I just do so and that's it. But what if I want to set only some of them and leave the rest with default values? I've seen in some tutorial ...
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Finding Pixels within UV Coordinates

I am building lightmaps for 3D models. My lightmap algorithm needs to determine which pixels( lumels ) within the lightmap texture fall within the boundary of a mesh face( triangle )...this process ...
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Adding false if statement to pixel shader produces a lag

One of lines in pixel shader produces a lag (lower fps). I can't understand why. if (TextureEnabled) color *= texDiffuse.Sample(texDiffuseSam, input.UV); Interesting fact is: TextureEnabled is ...
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Direct3D reducing DrawIndexed CPU usage

I am trying to optimise some of my rendering to get is useable on lower end machines (in my case a 2GHz i5 laptop with a GT 520M). A quick investigation showed that the GPU isnt actually getting to ...
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using DirectX to generate a sprite sheet

I am building a site in HTML5 for my client and it must run on the iPad/iPhone (i.e. Safari on iOS). They want a 3D effect where they have a simple, yet, specific product they want to show on the ...
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creating a UI menu in c++

Im currently working on a 2D Game where the users can interact with specific nodes and are able to edit certain bits of information and I also plan for the users to be able to click buttons to set ...
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Why are some objects not rendering properly?

Here's a button I exported from Blender into a .x format: Now here it is in the game with BasicEffect applied to everything: And now with my custom shader: And there's the problem. While the ...
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301 views

DirectX Unproject troubles

I have an orthographic projection and I try to unproject a point from screen space. Following are the view and projection matrices: var w2 = ScreenWidthInPixels/2; var h2 = ScreenHeightInPixels/2; ...
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blurry image rendered

I'm using Direct2D to render a PNG image using a ID2D1BitmapRenderTarget and then caling it's GetBitmap() function and rendering the image using ID2D1HwndRenderTarget::DrawBitmap(). Some of the ...
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How can I simulate multiple depth channels?

Here's what I'd like to achieve: Rendering a first pass of objects in my scene, using standard depth comparison Rendering another pass of objects in the same scene, but with the following rules: A ...
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Does calling VSSetShader() twice with the same shader have a performance penalty?

Let's say I render 2 objects that are using the same shader (and the same ID3D11VertexShader object). When I call VSSetShader() to set the shader for the 1st object DirectX has to change previous ...
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Multiple pixel shader passes

I currently have a pixel shader that calculates the texture and I have another that calculates the light. I want another shader that does both. What I would ideally like to do is instead of creating a ...
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Extract smaller frustum from camera frustum?

Background: I was thinking of implementing multiselection by performing a frustum culling on a sub-part of the screen. Problem: Given total screensize, a rectangle on the screen (pos, size), and ...
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Proper use of Dynamic Vertex Buffers for rapid update

I am creating a C#/SharpDx/DirectX10 application to plot line charts in a fast way. I have a prototype which uses Dynamic Vertex Buffers and fills a fixed-size buffer, say 1M vertices, with new data ...
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What does multisampling skip or improve? (so it can be faster than supersampling)

I never really fully understood this, or found an article which explained all the steps in a friendly way. I'll start with what I do know already (which I hope do not contain misconceptions). I'm ...
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How to mix textures in DirectX?

I am new to DirectX development and I am wondering if I am taking the wrong route to achieve the following: I would like to mix three textures which contain transparent areas and some solid areas ...
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Preventing banding textures in DirectX

I have a 3D scene that I've tried rendering in Direct3D 10 and using WPF's 3D framework. Obviously, going directly to Direct3D is producing far better performance but I am getting banding which ...
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DirectCompute information

I've been trying to make use of the GPU as part of a project of mine. I've looked into both CUDA and OpenCL, but the lack of information showing you how to introduce these into a project is shocking. ...
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Learning to code first game, few questions on basic game development and 3D

I've been programming for a while, and I'm concurrently learning how to make a basic game and slimdx, and wanted to talk to someone to hopefully get a few pointers. I've read that Tetris is the ...
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XNA - Drawing 2D Primitives (Boxes) and Understanding Matrices in Computer Graphics

I have two issues which I wish to solve by creating 2D primitives in XNA. In my game, I wish to have a "debug mode" which will draw a red box around all hitboxes in the game (Red outline, ...