A GPU program used in rendering. It is executed for each sample taken from a rasterized primitive. The output of this process is a number of values and a floating-point depth.
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Questions tagged [fragment-shader]
1506 questions
9
votes
1 answer
How to write pass-through vertex and fragment shaders for a framebuffer with attached texture?
I'm attempting to use shaders to modify a texture that is bound to a framebuffer, but I'm confused as to how the shaders get the "original" input values.
I'm doing the following:
GLuint textureId = 0;
glGenTextures(1,…
Mark Ingram
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9
votes
2 answers
Android OpenGL ES 2.0: Is "switch-case" syntax possible in GLSL fragment shader on Samsung Galaxy S2?
Does anybody know how to do switch case syntax in the fragment shader on the Samsung Galaxy S2? I get the compilation error: Expected literal or '(', got 'switch'.
My syntax is as follows:
switch(i){
case 0: x = alphas[0]; break;
case 1:…
Navigateur
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8
votes
2 answers
2 Textures, 1 Shader - OpenGL ES 2.0
ES 2.0 newbie here. I'm currently trying to make some 3D interlaced images from stereo images with ES 2.0 and the PowerVR SDK. I can output one image texture fine, but when I try to output the second one, I seem to be overwriting the first. So, my…
Stereoscopic
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8
votes
1 answer
Passing a float or color into a Metal fragment shader from Swift
I'm trying to write a fragment shader in Metal but can't get my head around how to pass in single values (e.g. float, float4 or half4). My shaders are as follows:
#include
using namespace metal;
typedef struct {
float4…
Doug
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8
votes
3 answers
ThreeJS [r85]: Custom Shader with Shadowmap
I've created a custom shader to be able to use a BlendMap with 4 different textures but I'm unable to get the shadows/lightning effects to work with it.
What am I missing here? Or is there some other way I can achieve same functionality?
Mesh…
Yenza
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8
votes
1 answer
Pixelated lighting shader
I've written a GLSL shader for use in Unity3D with my pixelated iOS app. It has two ONE problems:
1) The effect doesn't always stay with the moon, and
2) the lighting doesn't look pixelated.
I'll explain a little. The shader is meant to cause a…
Catlard
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8
votes
1 answer
What is this technique, if not bilinear filtering?
I'm trying to replicate the automatic bilinear filtering algorithm of Unity3D using the next code:
fixed4 GetBilinearFilteredColor(float2 texcoord)
{
fixed4 s1 = SampleSpriteTexture(texcoord + float2(0.0, _MainTex_TexelSize.y));
fixed4 s2 =…
A.Quiroga
- 5,704
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- 58
8
votes
3 answers
Compute bounding quad of a sphere with vertex shader
I'm trying to implement an algorithm from a graphics paper and part of the algorithm is rendering spheres of known radius to a buffer. They say that they render the spheres by computing the location and size in a vertex shader and then doing…
Ben Jones
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8
votes
1 answer
Accessing same-named uniform in vertex and fragment shaders fails
I'm still very inexperienced with shaders but I'm climbing the learning curve well.
Something I've stumbled upon this morning is an effort to use a same-named uniform in both fragment and vertex shaders.
The uniform can be defined in both shaders,…
Tom Pace
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8
votes
1 answer
Passing several textures to shader in LibGDX
I need to pass 2(or more) textures to one shader. Also I have to bind textures in render method, because I use FrameBuffer and try to bind textures on fly. So, my code is below:
@Override
public void show () {
fbo = new…
Nolesh
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8
votes
1 answer
GLSL shader not unrolling loop when needed
My 9600GT hates me.
Fragment shader:
#version 130
uint aa[33] = uint[33](
0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,
0,0,0
);
void main() {
int i=0;
int a=26;
for (i=0; i
user2464424
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8
votes
1 answer
Can someone please explain this Fragment Shader? It is a Chroma Key Filter (Green screen effect)
I'm trying to understand how this chroma key filter works. Chroma Key, if you don't know, is a green screen effect. Would someone be able to explain how some of these functions work and what they are doing exactly?
float maskY = 0.2989 *…
kilakev
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8
votes
1 answer
what's the counterpart for gl_TexCoord in OpenGL ES 2.0
I have a OpenGL shader which uses gl_TexCoord like the following does. But in OpenGL ES, gl_TexCoord is not supported. I wonder what can I do to refactor the code to get it work on OpenGL ES.
void main()
{
//scene depth calculation
float…
tom
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7
votes
1 answer
Really simple custom shader in Three.js - how to make it work?
I'm trying to make the simplest custom shader for Three.js that I can, but I haven't figured out how to make it work. The object the I'm using the shader for doesn't appear at all.
In my page html I have: