A program that runs on the GPU to determine output colors for pixels. Also known as a fragment shader.
3
votes
1answer
69 views
Shadow mapping. I don't understand what to do after creating the depth texture
I'm taking an intro to computer graphics course, so this is something we haven't touched on.
I am reading this tutorial ...
3
votes
2answers
194 views
How to implement color changing fragment shader?
I have a background of a given size and filled with a given color. I want to change it with an animation effect, starting from the center and spread out until it extends the whole background. The new ...
0
votes
1answer
120 views
3D position of an arbitrary UV coordinate
I have a UV map for a 3D mesh that encodes "links" between pairs of UV coordinates. I have previously defined this links (or pairs), one to one. The links are enconded using the function rgb_color(u1, ...
0
votes
1answer
92 views
2D RGBA texture is gray in GLSL shader
I have a shader to perform LUT coloring of a texture and a c++/c# programs that call it which work perfectly when i use a 1D texture.
Since i need to support computers that don't support the 1D ...
17
votes
3answers
1k views
Why is H (blinn) used instead of R (phong) in specular shading?
I can't find a good reason for this anywhere. The reflection vector used in phong has a simple basis in physics. But the half vector used in blinn seemingly has no rational basis, and does not ...
0
votes
2answers
64 views
Best way to detect if vec3 is between vec3(x) and vec3(y) in glsl
As titled
I am sampling from a texture and if the color is somehow gray [vec3(.8), vec3(.9)] and an uniform is 1 I need to substitute that color with another one
I am not a glsl veteran but I am ...
2
votes
2answers
167 views
Water silhouette shader using GLSL
I have this problem to solve using Cocos2d-x 3.x:
In my game there is water represented by rectangle texture, modified by the code on the go. I also have a character moving around, rotating etc.
I ...
0
votes
0answers
113 views
OpenGL shading doesn't work with different projection and view matrices?
I found an online (public-domain) code to do marching cubes, and I am trying to adapt this code to work in my own project. The code uses GLUT and "older-style" OpenGL, whereas I am using GLM and ...
0
votes
1answer
135 views
Can't sample texture in HLSL using DX11
Environment:
Windows 7 x64
Visual Studo 2012
DirextX11
HLSL Shader Model 5
Ogre 1.9
Okay, so I'm trying to sample a texture in my pixel shader but I'm coming across some strange problems. Here's ...
0
votes
1answer
88 views
How to fix this existing shadow shader/material with alpha textures?
I hope I could get some help here in finally resolving this problem of mine re: shadow casting with alpha textures.
Here's a screenshot on what I am hoping for as a result:
A friend of mine just ...
1
vote
2answers
108 views
Bad pixels on shader when loading cached binary programs
I have been trying to cache binary shader programs in my game and load them accordingly using "glGetProgramBinaryOES" and "glProgramBinaryOES" respectively.
I was successfully able to cache and load ...
0
votes
1answer
289 views
How to change pixel color of Texture with Fragment Shader
I want to change the pixel color of a texture. I don't know where to start and what to add. Really need help, I only find useless snippets in the internet.
My current Code:
public void ...
1
vote
2answers
334 views
Fast fullscreen quad rendering in Direct3D 11?
For the last few weeks, I've been trying to port a DX9 implementation of HDR rendering (tone mapping, bloom, stars, etc.) over to DX11. I believe I've got all features working but I'm not getting good ...
-1
votes
1answer
97 views
Combine Two Shader Program [closed]
For my android application, I want to apply brightness and contrast shader on same image.
At present I am using gpuimage plugin. In that I found two separate program for brightness and contrast as ...
0
votes
0answers
56 views
Pixel Shader : Backbuffer is 'Black'
After Fiddling around I am pretty sure this is not a Shader issue.
Edit 4:
The only diference I can see is that BasicEffect calls these methods before drawing:
// Make sure that domain, hull and ...
0
votes
0answers
77 views
Very basic OpenGL ES 2 error
This is an incredibly simple shader, yet I'm having a lot of trouble understanding what's wrong with it. I'm trying to send a float to my fragment shader. Its purpose is to adjust the alpha of the ...
2
votes
2answers
189 views
Strange if-else branching behavior in a fragment shader
In my fragment shader I have passed an uniform int uLightType variable, which indicates what type of light is in usage right now. The problem is that if-else branching does not work correctly - the ...
1
vote
1answer
138 views
Manually writing a dx11 tessellation shader
I am looking for resources on what are the steps of manually implementing tessellation (I happen to be using Unity CG, but any help is appreciated).
Today it seems that it is all the rage to hide ...
1
vote
1answer
50 views
Depth Map resolution shifting
the problem is with shadow mapping as you can see,
actually it works fine but in a certain condition that the Depth Map size must be equal to the size of rendering buffer, I use an infinite ...
0
votes
1answer
204 views
Optimizations using GLSL shaders
I have written a simple OpenGL application using GLSL shaders. Actually, my program just displays a simple cube with a phong lighting effect like below :
Here's a peace of the client code :
...
1
vote
1answer
43 views
Having trouble setting color in fragment shader
For some reason, the color isn't applying to the object. Here's my fragment shader code. There's probably something obvious wrong with it that i'm not seeing.
#version 330 core
out vec3 Color;
...
0
votes
1answer
100 views
How does OpenGL determine different outputs with shaders?
Lets say I have this GLSL code:
#version 330
out vec4 outputColor;
void main()
{
float lerpValue = gl_FragCoord.y / 500.0f;
outputColor = mix(vec4(1.0f, 1.0f, 1.0f, 1.0f),
...
0
votes
1answer
133 views
Normal Map Issues
I'm experiencing a very strange result in my very simple normal map implementation on iOS 7 - OpenGL ES 2.0. I'm only using the bare parameters necessary and I'm also skipping on all the tangent and ...
2
votes
2answers
414 views
3D position to UV coordinates in fragment shader
I am interested in converting an arbitrary 3D position computed at run time in the fragment shader to its corresponding UV coordinates. Notice that the 3D position I am interested in is NOT a 3D ...
0
votes
0answers
76 views
Shadow wall sight problems
i used this tutorial https://github.com/mattdesl/lwjgl-basics/wiki/2D-Pixel-Perfect-Shadows to make my shadows. I think its a pretty nice and easy method.
I render all my shadow in a Framebuffer and ...
1
vote
2answers
237 views
gl_FrontFacing - is there perfomance cost?
If I use gl_FrontFacing in my PS, is there any performance cost during vertex transformation (like cross product from triangle vertices), or is this value computed any time ?
0
votes
1answer
66 views
blend skybox runtime
I use soil to load the cubemaps. the fragment shader uses cubeMap2 as the current cube map. However, I want to change the cube Map based upon an event. My problem is how can I change the cube map. ...
1
vote
1answer
184 views
DirectX11 pixel shader in pipeline is missing
I'm writing a program which displays a MS3D model using DirectX, and unfortunately, the result shows nothing on the screen.
When I use the Graphics Debugger from Visual Studio 13, I notice that the ...
1
vote
1answer
302 views
GLSL blur shader algorithm results in a lumpy blur?
I'm writing a Gaussian blur shader and it's coming along pretty well. However, when I run it on a circle, the result is lumpy.
I'm using a simple nested for loop to create the blur. Here's the code ...
0
votes
2answers
170 views
Is there a way to optimize this 2D lighting effect shader? [duplicate]
I'm doing a little 2D game in C++ with Direct3D 11.
In the game I want to render a sort of shadow that covers part of the screen:
To do this I am using this pixel shader:
float4 PS_Main( PS_Input ...
0
votes
1answer
78 views
Why would I lose the D3D device during an HLSL unroll?
I have a pixel shader that downsamples a texture from one size to another. The downsample shader uses a nested 'for' loop to traverse the uv coordinates. When the for loop executes more than four ...
1
vote
1answer
2k views
Shader which supports vertex colors and pixel lights?
From my question at Unity Answers:
Hello everyone, I'm facing a bit of a problem here: I need a shader which has the ability to colour individual vertices and be lit pixel by pixel. Until recently, I ...
0
votes
1answer
744 views
problem using glm::lookAt and glm::perspective
I'm trying to change the code from the 22th tutorial at http://ogldev.atspace.co.uk/, using the GLM library, but the result seems wrong.
The problem is shown in the below picture:
While it should be:
...
1
vote
0answers
94 views
Can't understand the Schlick model formula
I'm trying to implement the Schlick shading model in the fragment shader. I took the formulas from Karsten Schwenk's "a survey of shading models for real-time rendering":
First of all I don't ...
0
votes
0answers
31 views
Strauss model : no specular component [duplicate]
I implemented the Strauss model with the metalness, transparency and smoothness parameters, taking the formulas from the book "Programming vertex geometry and pixel shaders", this is how I implemented ...
1
vote
1answer
764 views
Two pass blur shader using libgdx tile map renderer
I am trying to apply the following technique: blur effect using two pass shader to my libgdx game using the OrthogonalTiledMapRenderer. The idea is to blur the background wich is also a tilemap but ...
1
vote
2answers
348 views
Ward model implementation: specular component too weak
I'm trying to implement the Ward shading model, the anisotropic, computationally efficient version:
This is how I made it:
float alphaX=0.5, alphaY=0.5; // asinotropic roughness
float ...
0
votes
0answers
141 views
How can I compute spotlight attenuation when I only have a spotlight cutoff angle?
I am trying to compute the spot light attenuation, though I don't have a spotCosCutoff (cosine of the spotlight cutoff angle) predefined variable in the shader so I have to compute it myself. This is ...
2
votes
2answers
80 views
Compiling 2 Dimensional Constant Arrays Right into Pixel Shader to use as Lookup Table
I want to use a small 2 dimensional look up table in a fragment shader, but I don't want to pay for the performance cost of fetching it from memory for every fragment.
Is it feasible/reasonable to ...
2
votes
0answers
256 views
Ashikhmin-Shirley model implementation: ugly result
I am trying to implement the Ashikhmin-Shirley model using these formulas:
This is the GLSL 1.2 fragment shader code:
uniform vec4 materialAmbient, materialDiffuse, materialSpecular;
uniform ...
1
vote
2answers
391 views
What is the depth that a pixel shader may output? Is it necessary to write Depth?
In DirectX11, what does the depth that a Pixel Shader can output mean? Does a pixel shader need to output a depth so that we "write" the depth? If not, why would we output it?
For any doubts, I'm ...
3
votes
1answer
240 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 ...
0
votes
3answers
159 views
directional lightning
I have managed to get a point light working, but I am facing problem with directional lightning.
Fragment shader
uniform vec4 lightColour ;
uniform vec3 lightPos ;
uniform float lightRadius ;
...
2
votes
2answers
359 views
How can I remove branches from a fragment shader function?
I have a fragment shader, when I've carefully managed to remove most branching decisions, as I have found out through research here that they are bad.
But I have one function that I just can't work ...
0
votes
2answers
126 views
Alpha interpolation in a pixel shader
How does the interpolation in a fragment shader work when it comes to the alpha parameter?
I'm programming a shader with SharpDX, DirectX11. My idea is to interpolate 2 3d points of a segment, so ...
3
votes
4answers
729 views
How many times fragment shader is executed?
I have an OpenGL code, with 3 different shader programs.
I have a simple question, I know fragment shaders are executed for every every fragment in the scene.
But is there a way using which we can ...
2
votes
2answers
1k views
Computing pixel's screen position in a vertex shader: right or wrong?
I am building a deferred rendering engine and I have a question. The article I took the sample code from suggested computing screen position of the pixel as follows:
VertexShaderFunction()
{
...
...
0
votes
1answer
236 views
Why i can not load a simple pixel shader effect (. fx) file in xna?
I just want to load a simple *.fx file into my project to make a (pixel shader) effect.
But whenever I try to compile my project, I get the following error in visual studio Error List:
Errors ...
1
vote
1answer
294 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 ...
1
vote
0answers
87 views
How do I align textures properly with an exploding sprite / breakable body?
I'm working on a game based on Box2D and Starling which includes breakable bodies - bodies/objects that when hit with sufficient force break apart (into smaller pieces).
I've managed the physics part ...
