Questions tagged [glsl]

The OpenGL Shading Language (GLSL) is the standard programming language for shaders in OpenGL. There are many versions of the language, with each version corresponding to a version of OpenGL. OpenGL ES 2.0 and above have separate versions of GLSL.

Information about GLSL (for desktops) can be found on the OpenGL Wiki

Versions

GLSL

GLSL ES

OpenGL ES Shading Language 1.00 Specification, #version 100 es, OpenGL ES 1.0
OpenGL ES Shading Language 3.00 Specification, #version 300 es, OpenGL ES 3.0
OpenGL ES Shading Language 3.10 Specification, #version 310 es, OpenGL ES 3.2
OpenGL ES Shading Language 3.20 Specification, #version 320 es, OpenGL ES 3.2

8020 questions

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2 answers

Access to 3D array in fragment shader

I'm trying to provide access to a 3-dimensional array of scalar data to a fragment shader, from a Python program using PyOpenGL. In the fragment shader, I declare the a 3d sampler uniform uniform sampler3D vol; and in the Python program I have the…

asked May 10 '19 at 02:35

A. Donda

8,381
2
20
49

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1 answer

How to texture non-unwrapped model using a cubemap

I have lots of models that ain't unwrapped (they don't have UV coordinates). They are quite complex to unwrap them. Thus, I decided to texture them using a seamless cubemap: [VERT] attribute vec4 a_position; varying vec3 texCoord; uniform mat4…

opengl-es libgdx glsl opengl-es-2.0

asked Apr 29 '19 at 05:01

Nolesh

6,848
12
75
112

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1 answer

X-Y-Distance from camera to object in vertex shader

I want to show some fog / aerial view in my application. But I only want to use the x,y world distance from camera to the model to determine the appearance. I already managed to get the signed z-distance from camera to the models with this…

opengl glsl shader perspectivecamera opengl-2.0

asked Apr 24 '19 at 14:07

User Rebo

3,056
25
30

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1 answer

PyOpenGL - Minimal glDrawArrays Example

I've seen many minimal PyOpenGL examples, but none of the ones I've found make use of VAOs or glDrawArrays / glDrawElements. Instead they all use glVertex, glut shapes, and occasionally the old glCallList function. I'm now trying to write a minimal…

python opengl glsl pyopengl opengl-4

asked Apr 17 '19 at 21:05

Codesmith

5,779
5
38
50

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1 answer

How do I convince glslang to give me reflection information on unsized multidimensional arrays?

I am using glslang in my C++ based Vulkan project to deduce information about shaders that I am using to help automatically build my descriptor sets and descriptor set layouts. I have come to a point that I need to support unsized/runtime-defined…

glsl vulkan

asked Apr 08 '19 at 03:17

user1712469

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1 answer

How to fix incorrect Blinn-Phong lighting

I am trying to implement Blinn-Phong shading for a single light source within a Vulkan shader but I am getting a result which is not what I expect. The output is shown below: The light position should be behind to the right of the camera, which is…

c++ glsl shader vulkan light

asked Mar 31 '19 at 17:03

tester

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1 answer

How to get coordinate of fragment shaders? gl_FragCoord not working

I'm trying to make a Mandelbrot set explorer, which will shade the pixels on the screen based on its coordinate in the window. I've done this before without using shaders but its extremely slow. I can't figure out how to get the position of the…

java opengl glsl shader lwjgl

asked Mar 24 '19 at 01:26

uhin

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2 answers

GLSL: How to do switch-like statement

I would like to dynamically invoke an easing based on the data passed into the shader. So in pseudocode: var easing = easings[easingId] var value = easing(point) I'm wondering the best way to accomplish this in GLSL. I could use a switch statement…

glsl shader

asked Mar 14 '19 at 23:54

user10869858

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1 answer

Make a shader storage buffer in different shader programs accessible

What layout and binding do i have to do to make a (working) shader storage buffer readable in a second shader program? I set up and populated a SSBO which i bound successfully and used in a geometry shader. That shader reads and writes to that SSBO…

opengl glsl shader shader-storage-buffer

asked Mar 14 '19 at 17:57

prox

votes

1 answer

WebGL interpolate with a reference color inside a triangle

Using regl, I am trying to draw a triangle with WebGL where I can define a color at some reference point inside the triangle, and have the color of the other pixels be a function of their distance to this point. So far, it only works when this…

javascript glsl shader webgl regl

asked Mar 05 '19 at 17:16

Ren

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1 answer

OpenGL - strange SSAO artifact

I followed the tutorial at Learn OpenGL to implement Screenspace Ambient Occlusion. Things are mostly looking okay besides a strange artifact at the top and bottom of the window. The problem is more obvious moving the camera, when it appears as if…

opengl glsl opentk ssao

asked Mar 05 '19 at 06:35

livin_amuk

1,285
12
26

votes

2 answers

Shader - Anti fisheye by "pulling" pixels

I would like to fix the distortion of this image : Sorry for the quality, but this is the best example I could find. I don't know if fixing this distortion is possible (I would like to have straight doors, and a straight ceiling), but basically,…

glsl shader fragment-shader

asked Feb 10 '19 at 17:22

Xys

8,486
2
38
56

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0 answers

Three.js - Improving mobile performance (VR cardboard)

I´m developing a mobile VR web-app based on Three.js. To test the app I use two devices: Android NEXUS 5 (with Adreno 330), about 8 years old Android BQ AQUARIS X (with Adreno 506), about 3 years old Here´s what I´m using: GLTF models I load…

performance mobile three.js glsl shader

asked Feb 06 '19 at 16:57

spacorum

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1 answer

Three.js uniform dashed line relative to camera

I'm working to display geometric figures in 3D, using three.js. When you draw (by hand) hidden lines as dashed lines, the 'dashes' are regular for all them. This means that a line parallel to the camera plane or a line (nearly) perpendicular to the…

javascript three.js glsl shader line

asked Feb 04 '19 at 13:05

Basil Gass

votes

1 answer

GLSL Shader Unwanted Grayscale Effect

Let me preface this with the fact that I am very new to GLSL. I am attempting to use a shader to add a blur effect to slot reel symbols while they spin. I have a working blur effect going, which I have commented out just for simplicity and isolating…

glsl shader fragment-shader vertex-shader pixel-shader

asked Jan 30 '19 at 20:39

Brett Weiss

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