a computer program that runs on graphics hardware and provides a high degree of control over how scenes are rendered

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6
votes
3answers
7k views

shader tutorial for unity

I would like to start developing my own shaders within unity. For starters I would like to do a screen spaced blur. Are there any good tutorials to learn shader development besides the official ...
2
votes
3answers
3k views

2D shader to draw representation of rotating sphere

I want to display a 3D textured sphere, and then rotate it in one direction. The direction will never change, and the camera will never move. One way is to actually create a spherical mesh, map a ...
2
votes
2answers
798 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 ...
18
votes
3answers
3k views

What is a fragment?

What is a fragment in a fragment shader? Wikipedia says that: In general, a fragment can be thought of as the data needed to shade the pixel, plus the data needed to test whether the fragment ...
7
votes
1answer
2k views

Atmospheric Scattering

I'm trying to implement atmospheric scattering based on Sean O`Neil algorithm that was published in GPU Gems 2. But I have some trouble getting the shader to work. My latest attempts resulted in: ...
14
votes
2answers
13k views

GLSL Shader Effects: How to do motion blur, etc?

I am not sure how right it is to ask this question, but still here it goes. I have a full 2D environment, with sprites going around as landscape, characters, etc And to make it more state-of-art ...
1
vote
1answer
398 views

Mandelbrot set not displaying properly

I am trying to render mandelbrot set using glsl. I'm not sure why its not rendering the correct shape. Does the mandelbrot calculation require values to be within a range for the (x,y) [ or (real, ...
7
votes
4answers
1k views

glsl demo suggestions?

In a lot of places I interviewed recently, I have been asked many a times if I have worked with shaders. Even though, I have read and understand the pipeline, the answer to that question has been no. ...
16
votes
1answer
2k views

The practical cost of swapping effects

I use XNA for my projects and on those forums I sometimes see references to the fact that swapping an effect for a mesh has a relatively high cost, which surprises me as I thought to swap an effect ...
5
votes
2answers
721 views

What does the term 'photorealistic' really mean?

I was wondering about the term 'photorealistic' in regards to rendering and was wondering how this is used. Is it used to describe a shader (or set of) that have certain quantifiable features? Or any ...
8
votes
1answer
719 views

What is a rim shader used for?

What does a rim shader do and what is it used for? In what cases would it make sense to utilize a rim shader?
2
votes
1answer
263 views

Bluring behind something then drawing text?

I want to basically make a blur shader in glsl and use it like Windows 7 does for Windows. I want to for example draw something and then blur a rectangle, then draw text over it. If someone could ...
2
votes
1answer
574 views

Doubt about texture waves in CG Ocean Shader

I'm new on graphical programming, and I'm having some trouble understanding the Ocean Shader described on "Effective Water Simulation from Physical Models" from GPU Gems. The source code associated to ...
10
votes
2answers
4k views

Efficient skeletal animation

I am looking at adopting a skeletal animation format (as prompted here) for an RTS game. The individual representation of each model on-screen will be small but there will be lots of them! In ...
8
votes
1answer
1k views

Sprite sheets with buffer objects and shaders

What is the "best" way to handle sprite sheets with shaders and buffers? In immediate mode it is easy to modify a sprite's texcoords when it is drawn, but I don't know how to do this with modern ...
1
vote
1answer
1k views

OpenGL ES Shader help (Blending)

Earlier I required assistance getting to grips with how to retain the alpha channel of a transparent texture in my colourised texture shader program. Whilst playing with that first version of my ...
3
votes
1answer
1k views

OpenGL ES Basic Fragment Shader help with transparency

I have just spent my first half hour playing with the shader language. I have modified the basic program I have which renders the texture, to allow me to colour the texture. varying vec2 texCoord; ...
8
votes
4answers
699 views

I need help with 3d shading/lighting

How do you guys handle shading in a 3d game? I have a directional light source that shades one side of a tree made of cubes. The remaining 3 sides all get ambient shading only. So the 3d effect is ...
2
votes
1answer
359 views

What is the best way to render eletric wires (like in gta 4)?

From the top of my mind, I see 2 ways to do it : classic mesh. (but that's likely to be a lot of tris for little screenspace) bilboards (but the placements of the billboards may be tricky. still ...
15
votes
6answers
4k views

Modern Shader Book?

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 ...
-1
votes
1answer
778 views

2d Pixel Shader literature, algorithms, etc. for Pixel Bender for flash

I am looking for some literature about pixel shaders algorithms or how would you call it. It's for 2d top down space shooter kind of game. I was thinking effects like halos, slow time, trails, fast ...
4
votes
3answers
2k views

BlitzMax - generating 2D neon glowing line effect to png file

Originally asked on StackOverflow, but it became tumbleweed. I'm looking to create a glowing line effect in BlitzMax, something like a Star Wars lightsaber or laserbeam. Doesn't have to be realtime, ...
1
vote
1answer
553 views

Porting an HLSL 3.0 shader to 2.0?

I have a couple of .fx files from a Shader-Based 2D Shadows example. I want to utilize the same kind of technique with XNA 4.0's Reach profile, which if I understand correctly needs to have HLSL 2.0 ...
14
votes
2answers
4k views

How can I debug shader programs?

I'm in the process of debugging GLSL vertex shaders and I can't shake the feeling that I'm doing it wrong. In general I have two strategies to make up for the lack of tracing I stuff values into a ...
9
votes
3answers
1k views

Very slow direct3D texture sampling

So I'm writing a small game using Direct3D 9 and I'm using multitexturing for the terrain. All I'm doing is sampling 3 textures and a blend map and getting the overall color from the three textures ...
6
votes
2answers
1k views

Looking for an example of glass with XNA or DirectX 9

Any good pointers on how to get the refractive look of glass? I'm looking to create a think piece of glass type of look, sort of the type that you'd have on bathroom shower doors.
14
votes
2answers
17k views

OpenGL ES 2.0: Setting up 2D Projection

This article describes in general, how to draw sharp OpenGL 2D graphics, using fixed function pipeline. http://basic4gl.wikispaces.com/2D+Drawing+in+OpenGL Because OpenGL ES 2.0 has some ES 1.x ...
6
votes
3answers
2k views

What are the big advantages of shaders ? What is doable with them, and what can't be done without them?

I don't really know when vertex and/or pixel shaders became available for consoles and computers, but what could we do without them ? I don't really understand what is achievable with shaders and what ...
41
votes
6answers
19k views

What are the pros and cons of HLSL vs GLSL vs cg? [closed]

What are the pros / cons of the three?
12
votes
3answers
1k views

HLSL Translucent Plastic Shader

I'm trying to produce a shader to replicate a white plastic object with a colored light inside. Either by having a shader that will be translucent and if I put a light inside the object the light will ...
5
votes
3answers
1k views

Vertex Shader Fundamental Workings

I understand that water ripples (e.g. stone thrown into a pond) are often handled with vertex shaders. My first question is: are the ripples nothing more than an algorithm that is the function of ...
2
votes
2answers
921 views

vertex/pixel shaders and “materials”

What relationship is there, if any, of "materials" and vertex/pixel shaders (or the "effects" that combine the latter two)? I have the impression that before the advent of HLSL, materials were ...
5
votes
1answer
752 views

GLSL shader without a vertex array

Ok so I have a idea for a neat GPU driven curve renderer, and I realised that the vertex shader can be hardwired to generate points of the curve segment (to be rendered as a line strip) without ...
14
votes
7answers
13k views

What are some cool examples of procedural pixel shader effects? [closed]

What are some good examples of procedural or screen-space pixel shader effects? No code is necessary; I'm just looking for inspiration. In particular, I'm looking for effects that are not dependent ...
9
votes
6answers
4k 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 ...
11
votes
4answers
897 views

Is there any Shaders Directory? [closed]

There are many tutorials to learn GLSL, Cg, HLSL... with classical samples as bump mapping, toon-shading... But is there a shaders directory? a website where i can share my shaders search shader by ...
6
votes
2answers
610 views

What is a good alternative to Unified Shader for Shadows?

Most shadow systems I have seen use a unified shader system for shadowing techniques, resulting in an uber shader for the projects. What alternatives do you find work well or is the unified shader ...
19
votes
13answers
8k views

What are some good resources for learning HLSL?

The last time I tried learning HLSL, I made a few shaders and mostly understood what I was doing, but I still felt like I was stumbling in the dark. Most of what I learned I got from various blog ...
5
votes
2answers
1k views

OpenGL equivalent of .fx files in GLSL or Cg?

There's a lot of learning material in the DirectX world that uses .fx files to manage shaders, and .fx seems to be well integrated with 3D packages such as Maya and 3D Studio Max What do larger ...