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Search found 444 results on 18 pages for 'shaders'.

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• Does use of simple shaders improve performace/battery life?

  - by Miro

  I'm making OpenGL game for Android. Till now i've used only fixed function pipeline, but i'm rendering simple things. Fixed function pipeline includes a lot of stuff i don't need. So i'm thinking about implementing shaders in my game to simplify OpenGL pipeline if it can make better performance. Better performance = better battery life, unless…

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• How do I pass vertex and color positions to OpenGL shaders?

  - by smoth190

  I've been trying to get this to work for the past two days, telling myself I wouldn't ask for help. I think you can see where that got me... I thought I'd try my hand at a little OpenGL, because DirectX is complex and depressing. I picked OpenGL 3.x, because even with my OpenGL 4 graphics card, all my friends don't have that, and I like to let…

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• Shaders with pygtkglext

  - by qba

  Do someone know how to get glsl shaders work in gtk-opengl window? With glut all glCreateProgram etc. functions works, but when I tried to put the same gl code into pygtkglext window, its complaining about NullReference: OpenGL.error.NullFunctionError: Attempt to call an undefined function glCreateProgram, check for bool(glCreateProgram)…

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• Differences in cg shader code for OpenGL vs. for DirectX?

  - by Cray

  I have been trying to use an existing library that automatically generates shaders (Hydrax plugin for Ogre3D). These shaders are used to render water and somewhat involved, but are not extremely complicated. However there seems to be some differences in how the cg shaders are handled by OpenGL and DirectX, more specifically, I am pretty…

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• Understanding DeviceContext and Shaders in Direct3D/SlimDX

  - by Carson Myers

  I've been working through this tutorial about drawing triangles with SlimDX, and while it works, I've been trying to structure my program differently than in the tutorial. The tutorial just has everything in the main method, I'm trying to separate components into their own classes. But I'm not sure where certain components belong:…

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• Separate shaders from HTML file in WebGL

  - by Chris Smith

  I'm ramping up on WebGL and was wondering what is the best way to specify my vertex and fragment shaders. Looking at some tutorials, the shaders are embedded directly in the HTML. (And referenced via an ID.) For example: <script id="shader_1-fs" type="x-shader/x-fragment"> precision highp float; void main(void) { …

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• YUV Textures and Shaders

  - by Luca

  I've always used RGB textures. Now comes up the need of use of YUV textures (a set of three texture, specifying 1 luminance and 2 chrominance channels). Of course the YUV texture could be converted on CPU, getting the RGB texture usable as usual... but I need to get RGB pixel directly on GPU, to avoid unnecessary processor…

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• Modern Shader Book?

  - by Michael Stum

  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 Shaders, so I need a general introduction). I saw a lot of books that are a couple of years old, so I don't know if they still…

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• Developing GLSL Shaders?

  - by skln

  I want to create shaders but I need a tool to create and see the visual result before I put them into my game. As to determine if there is something wrong with my game or if it's something with the shader I created. I've looked at some like Render Monkey and OpenGL Shader Designer from what I recall of Render Monkey it…

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• How to handle multiple effect files in XNA

  - by Adam 'Pi' Burch

  So I'm using ModelMesh and it's built in Effects parameter to draw a mesh with some shaders I'm playing with. I have a simple GUI that lets me change these parameters to my heart's desire. My question is, how do I handle shaders that have unique parameters? For example, I want a 'shiny' parameter that affects shaders…

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• Painting with pixel shaders

  - by Gustavo Maciel

  I have an almost full understanding of how 2D Lighting works, saw this post and was tempted to try implementing this in HLSL. I planned to paint each of the layers with shaders, and then, combine them just drawing one on top of another, or just pass the 3 textures to the shader and getting a better way to combine…

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• Using raw vertex information for sprites rather than SpriteBatch in XNA

  - by The Communist Duck

  I have been wondering whether using SpriteBatch is the best option. Obviously for prototyping or small games it works well. However, I've been wanting to apply techniques such as shaders and lighting to my game. I know you can use shaders to some extent with SpriteSortMode.Immediate, but I'm not sure if you lose…

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• New to CG shader programming, what program should I use to write and test them?

  - by Notbad

  I have started witting some shaders. First ones were fairly easy to write in notepad but now I need something with a bit more meat. I have checked rendermonnkey that seems to support CG but it is really old and don't know if it is a good option. On the other hand there exist this FX Composer 2.0 but it seems…

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• Phone complains that identical GLSL struct definition differs in vert/frag programs

  - by stephelton

  When I provide the following struct definition in linked frag and vert shaders, my phone (Samsung Vibrant / Android 2.2) complains that the definition differs. struct Light { mediump vec3 _position; lowp vec4 _ambient; lowp vec4 _diffuse; lowp vec4 _specular; bool _isDirectional; …

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• WPF Parent Window shading using Pixel Shaders

  This article discusses using Pixel Shaders to shade the main window when a dialog is showing.

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• Impact of variable-length loops on GPU shaders

  - by Will

  Its popular to render procedural content inside the GPU e.g. in the demoscene (drawing a single quad to fill the screen and letting the GPU compute the pixels). Ray marching is popular: This means the GPU is executing some unknown number of loop iterations per pixel (although you can have an upper…

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• How to get warnings when compiling fx files

  - by jdv-Jan de Vaan

  When I compile DirectX shaders (.fx files), I dont see any compiler warnings unless there was an error in the effect. This happens both when using the offline FXC compiler, as well as calling SlimDx's CompileEffect (which is what we normally do). I could force warnings as errors (/WX), but if you…

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• Questions before I revamp my rendering engine to use shaders (GLSL)

  - by stephelton

  I've written a fairly robust rendering engine using OpenGL ES 1.1 (fixed-function.) I've been looking into revamping the engine to use OpenGL ES 2.0, which necessitates that I use shaders. I've been absorbing information all day long and still have some questions. Firstly, lighting. The…

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• GLSL vertex shaders with movements vs vertex off the screen

  - by user827992

  If i have a vertex shader that manage some movements and variations about the position of some vertex in my OpenGL context, OpenGL is smart enough to just run this shader on only the vertex visible on the screen? This part of the OpenGL programmable pipeline is not clear to me because…

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• glsl demo suggestions ?

  - by brainydexter

  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. Recently, one of the places asked me if I can send them a sample of 'something' that…

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• Bump mapping Problem GLSL

  - by jmfel1926

  I am having a slight problem with my Bump Mapping project. Although everything works OK (at least from what I know) there is a slight mistake somewhere and I get incorrect shading on the brick wall when the light goes to the one side or the other as seen in the picture below: The…

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• Partial Shader Signatures HLSL D3D11 C++

  - by ThePhD

  I had been debugging a problem I was having in a single shader file with 2 functions in it. I'm using DirectX 11, vs_5_0 and ps_5_0. I have stripped it down to its basic components to understand what was going wrong with the shaders, because the different named components of the…

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• Different ways to pass Textures into HLSL shaders

  - by codymanix

  The GraphicsDevice class of xna 4 has the properties Textures and VertexTextures. What is the exact difference? I don't really understand what MSDN tells me about this. I usually use Effect parameters to pass textures to my HLSL shaders. What are the differences between these…

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• Calculating distance from viewer to object in a shader

  - by Jay

  Good morning, I'm working through creating the spherical billboards technique outlined in this paper. I'm trying to create a shader that calculates the distance from the camera to all objects in the scene and stores the results in a texture. I keep getting either a completely…

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• Queries regarding Geometry Shaders

  - by maverick9888

  I am dealing with geometry shaders using GL_ARB_geometry_shader4 extension. My code goes like : GLfloat vertices[] = { 0.5,0.25,1.0, 0.5,0.75,1.0, -0.5,0.75,1.0, -0.5,0.25,1.0, 0.6,0.35,1.0, 0.6,0.85,1.0, …

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