Questions tagged [directx]

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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12
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1answer
2k views

Information about rendering, batches, the graphical card, performance etc. + XNA?

I know the title is a bit vague but it's hard to describe what I'm really looking for, but here goes. When it comes to CPU rendering, performance is mostly easy to estimate and straightforward, but ...
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5answers
6k views

Should I learn Direct3D 9, 10 or 11? [closed]

I'm just starting to get into 3D programming with Direct3D. What version of D3D should I pick up? 11 looks pretty neat, but 9 and 10 still seems to be pretty present. Given the current state of the ...
12
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1answer
5k views

What are screen space derivatives and when would I use them?

I see the ddx and ddy glsl functions and the hlsl equivalents come up in shader code every now and then. I'm currently using ...
2
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1answer
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Quaternion rotation problems [duplicate]

I want to rotate my model and I have X and Y rotations. Here is my code: ...
28
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4answers
5k views

game story event programming

I have developed a game engine in c/c++ and DirectX. I have a tile engine for the maps, animated player/npc sprites, talking to the npc, menus, and level changing but there is no game, it just feels ...
2
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3answers
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how to detect same keyboard key press only once

I am designing a keyboard class that can detect the keyboard key press only one time but I still cannot figure out the way to do it. My goal is just check and perform the action only once when the ...
29
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9answers
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Should I continue studying OpenGL or just switch to DirectX to give me a better chance of landing a job in the game industry? [closed]

I've been learning graphics programming for some time now using OpenGL and Linux. I'm pretty familiar with most of the concepts, but I would really like to further my knowledge and eventually pursue a ...
4
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1answer
4k views

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 ...
6
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2answers
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Low quality bilinear sampling in WebGL/OpenGL/DirectX

I'm seeing low quality bilinear texture sampling in WebGL, OpenGL and Directx, and was wondering if anyone knew how to make it higher quality? The picture below should help show what I mean. The ...
0
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2answers
901 views

Debugging .FX files in Visual Studio not working

So I have been learning how to use DirectX 11 for a while now and I have chosen to use the .FX framework rather than seperate .vs & .ps files. (I know it's deprecated but I found it a little ...
26
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3answers
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For voxel rendering, what is more efficient: pre-made VBO or a geometry shader?

Given a fairly static voxel array, what is more efficient: using the CPU to pre-generate a VBO to render the voxel faces (ignoring more advanced forms of rendering like marching cubes for now) or ...
24
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7answers
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How to get PS3/Xbox 360 experience without having access to Dev kits?

I am a budding game programmer trying to get into the industry programming for PS3, Xbox 360. The main problem I see is the need to demonstrate my skills to a potential employer, but without access ...
8
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4answers
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How to capture the screen in DirectX 9 to a raw bitmap in memory without using D3DXSaveSurfaceToFile

I know that in OpenGL I can do something like this glReadBuffer( GL_FRONT ); glReadPixels( 0, 0, _width, _height, GL_RGB, GL_UNSIGNED_BYTE, _buffer ); And its ...
4
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1answer
6k views

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 ...
3
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3answers
4k views

simplest way of making a sphere roll in a realistic way

rather than just moving a sphere across a plane, I want to make it roll like a ball. What is the simplest way of doing this? I assume it will have something to do with the circumference of the ball ...
7
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2answers
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Point Light Soft Shadows

How to implement soft shadows for omni directional (point) light. We use typical shadow mapping technique. Depth is rendered to texture cube and addresing is pretty simple then. Just using vector from ...
7
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1answer
3k views

How can I draw a perspective-correct quad?

I'm trying to draw a quad in 2D (in SharpDX, but that is basically XNA). But texture correction is not working, and I'm getting only an affine textured quad. I'm using ...
3
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1answer
989 views

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 ...
1
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1answer
300 views

How can I set the world matrix from an array of floats in D3D9?

I have objects that hold their own transform matrix (calculated every frame by the physics system) held in a linear array of floats as follows: ...
1
vote
1answer
1k views

Color grading, shaders and 3d textures

I'm trying to implement color correction with the 3d lookup table. The lookup table is actually just a 2d texture 256x16 and consists of 16 squares which one is 16x16. When it comes to rendering, I ...
12
votes
1answer
20k views

How do I integrate bullet physics into my game?

I downloaded the release file found here, but I'm just not sure where to start. In my game I have a number of oblongs and a sphere, I want all of these to collide with one another. (They all have ...
20
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7answers
9k views

Modern Shader Book? [closed]

I'm interested in learning about Shaders: What are they, when/for what would I use them, and how to use them. (Specifically I'm interested in Water and Bloom effects, but I know close to 0 about ...
14
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3answers
13k views

Fastest way to render lines with AA, varying thickness in DirectX

So I'm doing some DirectX development, using SharpDX under .NET to be exact (but DirectX/C++ API solutions are applicable). I'm looking for the fastest way to render lines in an orthogonal projection (...
14
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4answers
16k views

What are the current books for DirectX (w/ focus on 3D)? [closed]

For OpenGL, the OpenGL SuperBible 5th edition was just released only a few months ago, and is considered a fantastic, highly rated book for not only learning OpenGL 3 (Part 1 of the book), but it also ...
4
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4answers
31k views

Starting programming in 3D with C++ [closed]

EDIT: There aren't sufficient enough tutorials for what I'm trying to do in Python, so I'm going to take my time and slowly build up my skills in C++. It's hard to trip and not land in a book of C++ ...
20
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7answers
4k views

For 2D games, is there any reason NOT to use a 3D API like Direct3D or OpenGL?

I've been out of hobby Game Development for quite a while now. Back when I did it, most people used Direct Draw to create 2D games. By the time I stopped people were saying OpenGL or Direct3D with ...
9
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6answers
5k views

Good example of a multi-pass effect?

In XNA (and Direct3D in general AFAIK), rather than creating individual vertex and fragment shaders, you bundle potentially many related shaders into 'Effects'. When you come to use an effect you ...
7
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1answer
4k views

2D Line drawing with Pixel Shaders

Recently I asked a question, what is the fastest way to render 2D lines using DirectX, and one of the answers mentioned this paper on Fast Prefiltered Lines which uses Pixel Shaders to accomplish ...
7
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5answers
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Best pathfinding algorithm for a tower-defense game? [duplicate]

What do you suggest would be the best algorithm for a tower-defense game? It's a 2D based tile game, where there is walls and towers blocking the way, between spawnpoints and their destination points. ...
5
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2answers
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Is the “impossible object” possible in computer graphics?

This may be a silly question but I want to know the answer to it. I saw this thing called the "impossible object", while they're many different images of this online, it's suppost to be impossible ...
8
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1answer
1k views

How do commercial games engines organise the index/vertex buffers?

Preface: This question is going to be coming from a Direct3D point-of-view, because that's what I'm familiar with. Obviously we incur a slight overhead every time we change the vertex or index ...
7
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1answer
3k views

SRV from UAV on the same texture in directx

I'm programming gpgpu raymarching (volumetric raytracing) in directx11. I succesfully perform compute shader and save raymarched volume data to texture. Then i want to use same texture as SRV in ...
6
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2answers
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How does one write to another process's OpenGL/DirectX context?

I want to write a short of chat client that display the messages in-game (OpenGL/DirectX), but I really don't know how to handle this. It is easy to write my client in my graphic context... but what ...
9
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2answers
3k views

D3D/DXGI handle fullscreen transition

I have a D3D11 application, and I want to add proper fullscreen suport. Now I can let DXGI switch my window to fullscreen for me, and I'm under the impression that DXGI will take care of everything ...
8
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3answers
2k views

Display a Message Box over a Full Screen DirectX application

In our custom assertion handler, I'd like to display a message box asking to see whether or not this failure can be ignored. However, when our DirectX game is full screen, I can't get the MessageBox ...
6
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1answer
3k views

Spherical to Cartesian Coordinates

Well I'm reading the Frank's Luna DirectX10 book and, while I'm trying to understand the first demo, I found something that's not very clear at least for me. In the updateScene method, when I press A, ...
4
votes
3answers
4k views

Loading and using an HLSL shader?

I've been looking everywhere and all I can find are tutorials on writing the shaders. None of them showed me how to incorporate them into my scene. So essentially: Given an hlsl shader, if I were to ...
4
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1answer
1k views

Simplex Noise flat land and hills

I'm using the simplex noise to create Minecraft like terrain. I can only achieve hills like this. Does anyone know how to use simplex to make more dynamic landscapes?
3
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4answers
4k views

DirectX 11 Constant Buffers vs Effect Framework

I'm having some trouble understanding the differences between using constant buffers or using the effect framework of DirectX11 for updating shader constants. From what I understand they both do ...
1
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2answers
4k views

How does Windows GDI work compared to DirectX/OpenGL?

OpenGL and DirectX, if we are talking about graphics, are somehow built into a graphics card and you can access them using appropriate environment and draw some graphics. After reading wiki, I came ...
8
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1answer
1k views

How can I implement a renderer that can draw many kinds of primitives?

This is somewhat linked to a question I previously asked concerning the drawing of indexed primitives. My problem was that I was only drawing one cube when I wanted to draw many. I was told that the ...
5
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3answers
3k views

The pros and cons - DX9 moving to DX11 render?

We are a "nano" game dev company working on REFUSION. DX9 renderer is almost done and question is: Should we move it to DX11 or not? Anyone have experience with this? Here are some videos from dev ...
4
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5answers
2k views

How do I convert DirectX's .X from binary encoding to text encoding and back

As far as I know, .X format can be text encoded and binary-encoded. I basically want to look into the model I'm playing with, get a better understanding of .X, possibly make some changes in it and ...
4
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2answers
487 views

DirectX11 - Color Interpolation Along Quad Diagonal

Imagine that we have a vertex structure that looks like this: struct Vertex { XMFLOAT3 position; XMFLOAT4 color; }; The vertex shader looks like this: <...
4
votes
1answer
3k views

Bitwise operators in DX9 ps_2_0 shader

I've got the following code in a shader: // v & y are both uints nPixel = v; nPixel << 8; nPixel |= y; and this gives me the following error in ...
3
votes
2answers
3k views

How do I convert matrices intended for OpenGL to be compatible for DirectX?

I have finished working through the book "Game Physics Engine Development 2nd Ed" by Millington, and have got it working, but I want to adapt it to work with DirectX. I understand that D3D9+ has the ...
3
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2answers
2k views

Implementing Geometry Instancing in DirectX

I have a project that I'm doing in Managed DirectX (DX9) where I want to render lots of grass. My current method (many draw calls) is slow, but I've heard Geometry Instancing can fix that. I know ...
1
vote
5answers
2k views

Why would a game developer choose Direct3D instead of something with more cross-platform support?

Why would a game developer choose to use Direct3D (D3D), instead of using something with more cross-platform support, like the Vulkan or OpenGL APIs? I know the hardware is actually rendering.
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6answers
23k views

Visual Studio 2012 and Game Development [closed]

Alright, I think it's a simple question, but I got difficulties to find some answers around. I already read that XNA wouldn't be in Visual Studio 2012. I recently learned to use XNA, but since I ...
9
votes
3answers
13k views

Does Windows 8 still support DirectX 9?

Is Windows 8 supporting DirectX 9? Because I was looking through some samples written in C++ and DirectX 9 made for Windows 8. It wasn't that, like I know it ( look here http://directxtutorial.com/...