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.
Resources
Questions tagged [fragment-shader]
1506 questions
0
votes
1 answer
Smooth gradient in fragment shader
I am looking for some way how to get smooth gradient with fragment shader. I have palette with 11 colors and value which used to define color (it lays in range from 0.0 to 1.0).
I am trying to get smooth color translation with such fragment…
frankie
- 728
- 1
- 10
- 28
0
votes
1 answer
Writing a Atom editor plugin, animated syntax coloring
I am in for a little experiment, I just need someone to guide me..
I want to make my own custom syntax coloring (for Javascript), and that needs to be animated.
Big plus would be (if it is possible) is posibility of using shader-language for fonts…
Vili Volcini
- 327
- 4
- 16
0
votes
3 answers
How to determine if point lies inside shape?
I need to determine if point lies inside shape. In case our shape is circle it's easy:
highp vec2 textureCoordinateToUse = vec2(textureCoordinate.x, (textureCoordinate.y * aspectRatio + 0.5 - 0.5 * aspectRatio));
highp float dist = distance(center,…
Timur Bernikovich
- 5,660
- 4
- 45
- 58
0
votes
1 answer
OpenGL texture precision / texcoord vs. attribute
I'm drawing a simple textured quad (2 triangles) using a one dimensional texture that hold 512 values ranging from 0 to 1. I'm using RGBA_32F on a NVIDIA GeForce GT 750M, GL_LINEAR interpolation and GL_CLAMP_TO_EDGE.
I draw the quad using the…
Nicolas Rougier
- 670
- 7
- 15
0
votes
1 answer
Add radial gradient texture to each white part of another texture in shader
Recently, I have read article about sun shader (XNA Sun Shader) and decided to implement it using OpenGL ES 2.0. But I faced with a problem connected with shader:
I have two textures, one of them is fire gradient texture:
And another one is texture…
Nolesh
- 6,848
- 12
- 75
- 112
0
votes
0 answers
What is wrong in this fragment shader?
I am writing a simple OpenGL app, that applies a 2D texture to a triangle strip. My fragment shader does not compile (I am using PyOpenGL):
FRAGMENT_SHADER = shaders.compileShader("""#version 130
in vec4 color_v;
layout(location = 0) out…
Raoul
- 1,872
- 3
- 26
- 48
0
votes
1 answer
GLSL: How to lower 2D light center density?
I found a shader on the Internet which creates 2D lights.
What I'm curious about is that "How can I make the centre of the light less dense to be able to see other objects while still illuminating them?"
Here is the shader:
uniform vec2…
Sierox
- 459
- 3
- 18
0
votes
0 answers
Chroma Keying Shader
I want to apply chroma keying shader for my application. For this I used GPUImage plugin. In that I found GPUImageChromaKeyingBlendFilter class to satisfy my needs.
In plugin, GPUImageChromaKeyingBlendFilter class contains wrong program for chroma…
Siddharth
- 4,142
- 9
- 44
- 90
0
votes
1 answer
OpenGL Diffuse Lighting Shader Bug?
The Orange book, section 16.2, lists implementing diffuse lighting as:
void main()
{
vec3 N = normalize(gl_NormalMatrix * gl_Normal);
vec4 V = gl_ModelViewMatrix * gl_vertex;
vec3 L = normalize(lightPos - V.xyz);
gl_FrontColor = gl_Color *…
anon
- 41,035
- 53
- 197
- 293
0
votes
1 answer
Compatibility issues on GLSL fragment shaders
I have found a few times differences between GPUs handling fragment shaders. One example was doing pow(x) where x is negative. One GPU handled it well while the other one failed.
Another situation was where I rewrote if() statements with step()…
lukas.pukenis
- 13,057
- 12
- 47
- 81
0
votes
1 answer
OpenGL finding `in vec3 vert` but not `in float val` in vertex shader
I have some code that draws squares by passing points through a geometry shader. I construct an array which is sequences of 3 floats, bind that to the in vec3 vert attribute of my vertex shader, and everything is fine.
However, I want to add another…
vgel
- 3,225
- 1
- 21
- 35
0
votes
2 answers
Segfault on glProgramUniform1i
I'm trying to get screenWidth and screenHeight into my fragment shader through uniform variables. Here's my main.cpp where the offender lies, I can get the location (non -1) but when it actually sets the uniform variable thingy I segfault.
#include…
Dan Brinkman
- 71
- 3
0
votes
1 answer
How to properly implement Cook-Torrance shading in three.js?
I'm trying to implement the Cook-Torrance shading algorithm in three.js I have a mostly working solution, however it doesn't show the effects of the ambient light. The sides of the cube not illuminated by the light are completely black. If I remove…
Bakuriu
- 98,325
- 22
- 197
- 231
0
votes
1 answer
Diffuse lighting error on parallel surfaces
As a test, I created a simple quad. Here are its attributes:
Vertex vertices[] =
{
// Positions Normals
{vec3(-1,-1, 0), vec3(-1,-1, 1)}, // v0
{vec3( 1,-1, 0), vec3( 1,-1, 1)}, // v1
{vec3(-1, 1, 0), vec3(-1, 1, 1)}, //…
mchiasson
- 2,452
- 25
- 27
0
votes
2 answers
WebGL - Example of WHERE to set attributes/uniforms
I have seen several examples/tutorials of WebGL where the gl.getAttributeLocation() or gl.getUniformLocation() and the like are called. However, these are all in a demo/tutorial scenario.
The issue/concern is this:
The gl.getAttributeLocation, for…
AlvinfromDiaspar
- 6,611
- 13
- 75
- 140