Tagged Questions

1
vote
0answers
104 views

tex2dlod and tex2d giving different values [closed]

I've been having trouble with vertex texture fetch for a terrain system I am implementing. I'm using C++/DirectX9. I have already implemented exactly what I want as a prototype in C#/XNA and now ...
1
vote
0answers
114 views

How to achieve supersampling / anti-aliasing in pixel shaders?

I am trying to write a couple pixel shaders to apply to images similar to Photoshop effects. For example this effect: ...
0
votes
2answers
333 views

HLSL shader optimization [closed]

The following HLSL shader (without preprocessing) results in 65 arithmetic operations (see below). Can the same effect achieved with <=64 operations? // Center of "light" float x; float y; // ...
1
vote
1answer
178 views

MultiTexturing by neighbouring points textures

Visual example: I've been trying to understand multitexturing for a while now, I've created a terrain generator but have no need for height just yet and I still want one texture to blend over to ...
6
votes
1answer
125 views

XNA Deferred + Forward, Depth Problem?

Im working with my deferred engine in XNA 4.0 and Im combining it with a forwardpipeline to support semi-transparency and other "forward only" effects. Let me describe what I do: Render GBuffer ...
1
vote
2answers
307 views

HLSL Pixel Shader that does palette swap

I have implemented a simple pixel shader which can replace a particular colour in a sprite with another colour. It looks something like this: sampler input : register(s0); float4 ...
1
vote
1answer
186 views

XNA Shader Texture Memory

I was wondering about texture optimization in XNA 4.0. Will the the contentmanager send the texturedata to the GPU directly when the texture gets loaded or do I send the texture data to the GPU when ...
1
vote
0answers
173 views

Outline Shader Effect for Orthogonal Geometry in XNA

I just recently started learning the art of shading, but I can't give an outline width to 2D, concave geometry when restrained to a single vertex/pixel shader technique (thanks to XNA). the shape I ...
0
votes
1answer
104 views

how to create texture for modelmesh?

Is there a possibiltiy to create a texture from a meshpart in xna. By getting a flat version of the mesh. So I can create a texture for it and edit that texture(via rendertarget)? I need to get the ...
2
votes
0answers
1k views

Why is my deferred lighting implementation so expensive?

I've implemented deferred lighting and I tried to put about 20-26 lights on the viewable space of my map, and it brings down the FPS from 61 to 28-31. It also makes my VGA temperature to go from 68°C ...
2
votes
1answer
385 views

Using SurfaceFormat.Single and HLSL for GPGPU with XNA

I'm trying to implement a so-called ping-pong technique in XNA; you basically have two RenderTarget2D A and B and at each iteration you use one as texture and the other as target - and vice versa - ...
2
votes
1answer
205 views

Shader and Custom Vertex Format Errors

I am creating an editor of sorts that allow you to create 3D voxel models. I just got started and have ran into a few errors. Here is what it is producing: I think the problem has to do with the ...
1
vote
2answers
175 views

How (if possible) would I change the BasicEffect Matrix mid draw

Say, for example, I have a list of enemies. Each enemy is a textured quad which is the stored in a singular shared VertexBuffer and IndexBuffer with the buffer usage set to BufferUsage.WriteOnly ...
1
vote
1answer
631 views

How to set TextureFilter to Point to make example Bloom filter work?

I have simple app that renders some particles and now I am trying to apply the bloom shader from the xna samplers ( http://create.msdn.com/en-US/education/catalog/sample/bloom ) to it, but I am ...
2
votes
1answer
392 views

tiled map - changing textures? (XNA HLSL)

I have successfully created a tiled map of various textures. Right now, i had a Vector4 in my own custom Vertex declaration deciding what texture each of the tiles should be. This is working ...
1
vote
1answer
547 views

Rendering fancy particles?

I'm making a tower-defense game for Windows (not phone) in XNA. I've seen this video of another tower-defense game for Windows Phone that uses particle effects, which I really like. They change ...
9
votes
1answer
2k views

Wave ripple effect?

I've been working on a tower-defense game for some time now, and so far I am really satisfied with the results. However, there's one thing I'd like to add. I've seen a video of GeoDefense for Windows ...
5
votes
1answer
586 views

Perlin noise - copying the algorithm on the CPU?

I have successfully made a Perlin noise algorithm on the GPU. It works as expected, and generates great results. Now, as part of the physics calculations in my game, I need to replicate the exact same ...
6
votes
2answers
293 views

Does it make sense to include an index for linelists?

Does it make sense to include an index by using DrawIndexedPrimitives, when using linelists performance wise? I could imagine it would be easy for the GPU to generate such indexes anyway.
3
votes
1answer
145 views

Instancing with empty data, or varying vertex counts?

I am new to game development, having only developed a few games before, in 2D space, but with 3D rendering. I have implemented instancing before, but this is only my 2nd time doing it. I have a ...
4
votes
2answers
495 views

Rendering everything with a shader when only squares are needed?

I am building a game that is tile-based (filled with glowy vector squares). Right now, I am considering using instancing for drawing these, but I would like to know if there is a faster approach. The ...
2
votes
2answers
602 views

Compatibility between DirectX 9 and DirectX 10 shaders

I am a beginner to game development and as I am used to programming in C# I decided to go for XNA. I've been playing around with it for a while and now I am learning the basics of HLSL shaders, I have ...
4
votes
2answers
1k views

C# XNA - Sky Sphere Question

I have been banging my head against the wall trying to get a sky sphere to work appropriately in XNA 4.0. I have the sphere loading correctly, and even textured, but i would like something a little ...