a computer program that runs on graphics hardware and provides a high degree of control over how scenes are rendered
3
votes
1answer
413 views
Spherical fractal noise generator in shader
I have a growing sphere in space, and I thought of having a procedural generated texture over it. Since it is growing, I thought a fractal would be a great choice, because more details would be ...
3
votes
4answers
448 views
Enconding/Decoding bit value in Texture Alpha Channel
I am Rendering to a SurfaceFormat.Color. (R8G8B8A8)
The alpha of this format has 8 bits and I want to be able to use those 8 bits as a bit field.
For example, in one pass of my render, I want to save ...
3
votes
3answers
1k 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, ...
3
votes
1answer
92 views
Messed up UVs in Unity3D for Android
All of my quads appear correctly textured on the Unity3D editor, a Motorola Xoom Android tablet, and on an iPad 2:
But on our Samsung Galaxy Mini 2 smartphone they kinda look like this:
I wrote ...
3
votes
1answer
400 views
How are vertex shader outs sent as inputs to the fragment shader?
I'm learning some OpenGL 3.2 way of doing things and I think it's quite great, I'm actually understanding more of shaders and non-fixed pipeline in 1 week rather than those 2 years I tried to learn ...
3
votes
1answer
195 views
cocos2d mask rotation
I've been experimenting with Ray Wenderlich's tutorial about masking sprite using shaders with cocos2D 2.0.
It works pretty well but now I'd like to rotate the mask independently of the masked ...
3
votes
1answer
464 views
Monogame/SharpDX - Shader parameters missing
I am currently working on a simple game that I am building in Windows 8 using MonoGame (develop3d). I am using some shader code from a tutorial (made by Charles Humphrey) and having an issue ...
3
votes
1answer
519 views
Shadow-mapping xna
I've been trying to implement shadows in my game and I've been following quite a few tutorials online, mainly Riemers, but I'm always getting the same 2 errors when I'm drawing my models and setting ...
3
votes
1answer
1k views
Changing the color of some fragment of a texture using shaders
Declarative programming language QML allows to connect the elements, their properties with universal variables in shader programs description. For these purposes there is such elements as ...
3
votes
2answers
355 views
WebGL geometry calculations
I have a dynamic surface in WebGL, that is animated in vertex shader. I want other objects to interact with this surface (for example, an object riding on dynamic terrain). What's the best way to do ...
3
votes
1answer
689 views
How'd they do it: TF2 payload cart glow?
How did the creators of TF2 make the glow on the payload cart visible through walls? Is it possible to implement this in Unity's shaderlab?
3
votes
1answer
900 views
How to make a gaussian blur effect in UDK
I want to make a plane shape (surface) that have a gaussian blur applied to it and this plane is transperant, so all objects behind it looks like they are having a gaussian blur effect.
3
votes
1answer
911 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;
...
3
votes
2answers
185 views
Techniques for reducing terrain shader complexity
My terrain shader does quite a bit, but I don't know how to break it up in any way that will reduce my instruction count without removing key features of the terrain. It does the following:
...
3
votes
1answer
947 views
DirectX11, how to properly update a staging buffer with a structured buffer's count using CopyStructureCount
Alright, I'm not quite sure what is going on with my code at the moment.
I'm currently getting around to defining behavior for my particle system, and to better do this I need to know how many ...
3
votes
2answers
231 views
Fire range arc behind buildings
need some help with HLSL. Each charater in my game shows a fire range arc (which is a textured model) which show how far the guy can shoot, see
It looks ok, but I hate the fact that it shows even ...
3
votes
0answers
54 views
Multipass shaders and switching between passes
As mentioned here Effects should be avoided in DX11. If I understand correctly, that includes techniques and passes defined in *.FX files. So when doing a multipass shader (like the always-mentioned ...
3
votes
2answers
234 views
2D water shader similar to Limbo's effect
I'm wondering how I would go about creating a 2D water shader that is seen in this video http://www.youtube.com/watch?v=phChFfi4GOs
The water effect that limbo uses is pretty awesome. I'm not so ...
3
votes
0answers
99 views
Combining Effects
To be able to work efficiently with effects, isn't there a "good" way to combine multiple effects so that one effect handles stuff like "Multi texturing" and another controls the value like Ambient ...
3
votes
1answer
219 views
Does Unity's “Transparent Bumped Specular” translate to “semi-shiny must be semi-transparent”?
Unity's documentation for the "Transparent Bumped Specular" shader/material-type is simply a concatenation of each of the descriptions for its Transparent and Specular Shaders (and also Bumped, but ...
3
votes
0answers
191 views
Suitability of ground fog using layered alpha quads?
A layered approach would use a series of massive alpha-textured quads arranged parallel to the ground, intersecting all intervening terrain geometry, to provide the illusion of ground fog quite ...
3
votes
0answers
239 views
How to reproduce the 3ds Max Gradient Ramp effect?
The material definition of a mesh is composed of these three components: Self-Illumunation, Refletcion and Refraction. Each of these components has a Gradient Ramp as a map and the mapping mode is set ...
3
votes
0answers
692 views
Sampling from depth texture causes shader to stop working
I'm currently having issues with depth textures. When I sample from a depth texture it causes my other samplers to fail. For example, when I set gl_FragColor manually the depth buffer is correct. I ...
3
votes
1answer
381 views
Phone complains that identical GLSL struct definition differs in vert/frag programs
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 ...
3
votes
2answers
94 views
Screen effects and antialiasing
I have been working on a game for a while using glut for basic window creation.
I was rendering to an offscreen buffer so that I could implement various effects like screen bulging, motion blur, ...
2
votes
2answers
612 views
Optimizing gaussian blur with linear filtering
There's a few (here, and here) gaussian blur tutorials out there suggesting that you can essentially cut the number of texture lookups in a gaussian blur shader in half by exploiting the GPU's ...
2
votes
3answers
527 views
Rain effect using DirectX 9 capabilities
Is it possible to achieve something similar to nVidia's rain demo using only shader model 3.0 capabilities? If yes, could you point out a few documents/web resources that are suitable candidates and ...
2
votes
1answer
164 views
What are the factors that determine the default frequency of a shader call?
After i have been played for some days with various vertex and fragments shaders seems clear to me that this programs are called by the GPU at every and each rendering cycle, the problem is that I ...
2
votes
2answers
582 views
Which is worst: Too many VertexShader instructions, or FragmentShader instructions?
I want to have a better understanding of how to create shaders with optimal performance and realize where some bottlenecks can occur.
Is it usually favorable (when possible) to delegate most of the ...
2
votes
2answers
428 views
Lighting problems with Terrain
I'm in the process of learning Open GL and am having issues with lighting on my Terrian, I don't know if the issue is related to how I calculate my normals or the shader itself (I am using the shader ...
2
votes
1answer
486 views
Shader optimization - Cg/HLSL pseudo and via multiplication
HLSL/Cg do not allow texture fetching inside conditional blocks. To get around this I am first checking a variable and performing some computations, afterwards I set a float flag to 0.0 or 1.0, ...
2
votes
3answers
1k 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
1answer
162 views
How can I pass an array of floats to the fragment shader using textures?
I want to map out a 2D array of depth elements for the fragment shader to use to check depth against to create shadows. I want to be able to copy a float array into the GPU, but using large uniform ...
2
votes
1answer
214 views
Graphic hardware texture formats shaders relational speed
I'm interested to know, is there a direct correlation to the speed that a shader will run based on the bit depth of a texture upon which it is running. For example: If I have a 2 bit stencil texture ...
2
votes
1answer
221 views
Basic knowledge for 2d gaming and images?
Can anybody refer me some pdf or ebook that i should follow for basic 2d programming and texture ,shaders and other gaming elements details in depth.By which i can easily get through the 2d game ...
2
votes
2answers
817 views
Multiplatform GLSL shader validator?
Im working on a multiplatform (Pc,Mac,Linux) game that uses shaders quite extensively. Since we do not have any funding, it is pretty hard to test our game on all possible hardware configurations.
...
2
votes
1answer
261 views
shader coding: calculate screen coordinates of fragment
Good morning,
I'm new to shader coding and trying to implement some visual effects code in shaders using billboards. (Yes, I couldn't have picked anything harder to start with, but I'm lucky that way)
...
2
votes
1answer
373 views
Transformed Pretransformed coordinates?
I am creating a minecraft like terrain engine thing in XNA and C#, and I am trying to create a item/block selector tool. The thing is I would like to have 3D objects on the tool. So I thought for the ...
2
votes
2answers
656 views
implementing multi pass rendering in a game engine
I have done multi pass rendering before and understand how it works. I did a simple example which rendered a basic scene with shadows. This was all done in one file. Now I am trying to figure out is ...
2
votes
2answers
712 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 ...
2
votes
1answer
120 views
How can I render the whole faces instead of only the vertices? [closed]
I'm doing my master thesis in comparing DX9 LoD with DX11 Tesselation LoD. Therefore I use a ShaderManager that calls either the shader for the DX9 implementation, where the model is exchanged by the ...
2
votes
1answer
170 views
How to draw a Bezier line with shaders?
I found a shader code to draw filled Quadratic Bezier in
http://http.developer.nvidia.com/GPUGems3/gpugems3_ch25.html
How can use something similar to draw a Bezier line that follows the same path?
...
2
votes
1answer
186 views
VBO and shaders confusion, what's their connection?
Considering OpenGL 2.1 VBOs and 1.20 GLSL shaders:
When creating an entity like "Zombie", is it good to initialize just the VBO buffer with the data once and do N glDrawArrays() calls per each N ...
2
votes
1answer
125 views
Shadow cubemapping?
I am working on a game with C++ and OpenGL 3.2. I have successfully implemented directional shadow maps and now I'd like to upgrade them to shadow cube maps (for point lights). I've done some Googling ...
2
votes
1answer
749 views
Unity custom shaders and z-fighting
I've just readed a chapter of Unity iOS Essential by Robert Wiebe.
It shows a solution for handling z-figthing problem occuring while rendering a street on a plane with the same y offset.
Basically ...
2
votes
1answer
160 views
Efficient manager/controller for uniform and/or attribute variables in a rendering engine
Most engines on the market have their drawbacks and it's difficult to find a simple/light-weight one that's open-source and doesn't have to put you through a rather complex learning process. Writing ...
2
votes
3answers
878 views
Decompile an FX shader
Is it possible to decompile a .xnb file? I've lost my shader code, but only have my .xnb file left.
2
votes
1answer
1k views
I cannot update a shader constant via a constant buffer in DirectX 11
I've tried everything I can think of, but I cannot get a constant buffer to update a variable in my shader in DirectX 11. I followed the examples on msdn. I read and re-read the articles on constant ...
2
votes
1answer
213 views
pixel shader and vertex shader problem in visual studio 2008
I have just installed XNA for VB2008 professional, now i try to run my first game development and i get this error,
any way around this, am using windows xp sp3
my system configuration
Host Name: ...
2
votes
2answers
2k views
How do I create a sky box with OpenGL ES 2.0?
Can you give me hint to any good sky box example in OpenGL ES 2.0? I have found only OpenGL and does not work for me.
I am doing it this way:
Initialization:
glUseProgram(m_programSkyBox.Program);
...
