https://learnopengl.com/Getting-started/Shaders
It is easier to understand and saves you (and OpenGL) some work. The other exception is that the fragment shader requires a vec4 color output variable, since the fragment shaders needs to generate a final output color. If you fail to specify an output color in your fragment shader, the color buffer output for those fragments will be undefined

https://www.youtube.com/watch?v=5W7JLgFCkwI
Patreon https://patreon.com/thechernoTwitter https://twitter.com/thechernoInstagram https://instagram.com/thechernoDiscord https://thecherno.com/disc

https://stackoverflow.com/questions/17789575/what-are-shaders-in-opengl-and-what-do-we-need-them-for
73. The OpenGL wiki gives a good definition: A Shader is a user-defined program designed to run on some stage of a graphics processor. History lesson. In the past, graphics cards were non-programmable pieces of silicon which performed a set of fixed algorithms: inputs: 3D coordinates of triangles, their colors, light sources. output: a 2D image.

https://medium.com/@yvanscher/an-introduction-to-shaders-in-opengl-c19a1376eda1
Tutorial 1. The point of this tutorial is to get started. You need two shaders, a vertex shader and a fragment shader. The vertex shaders processes each point/vertex that you pass in and returns

https://www.khronos.org/opengl/wiki/Shader
They exist mostly to compute Implicit Derivatives to make many texture sampling functions work. Compute Shaders: ... The maximum number of image variables for this shader stage. The OpenGL-required minimum is 8 for fragment and compute shaders, and 0 for the rest. This means implementations may not allow you to use image variables in non

https://tutorialedge.net/gamedev/opengl/getting-started-with-shaders/
The last part of the shading pipeline processes the individual fragments generated by OpenGL's rasterizer and must also have a shader bound to it. In practice this means that for a very basic example we need only provide a vertex and a fragment shader in order for us to have a working shader pipeline. ##5. The Compute Shading Stage

https://learnopengl.com/Guest-Articles/2022/Compute-Shaders/Introduction
In order to complete this chapter, you will need to be able to create an OpenGL 4.3+ context. The compute shaders to be discussed are only available starting in OpenGL 4.3. Using OpenGL 3.3 or earlier will result in errors. The sample shader code will use OpenGL 4.3. To summarize, compute shaders work great for many small parallel batches.

https://www.youtube.com/watch?v=YaiSvKTOeRg
In this tutorial I'll teach you the basics of Shaders in OpenGL and play around with them for a bit.*Source Code and Exercises*https://github.com/VictorGorda

https://antongerdelan.net/opengl/shaders.html
OpenGL 4 shaders are written in OpenGL Shader Language version 4.00.9. The GLSL language from OpenGL versions 3 to 4 is almost identical, so we can port between versions without changing the code. OpenGL version 3.2 added a new type of shader: geometry shaders, and version 4.0 added tessellation control and tessellation evaluation shaders.

https://learnopengl.com/Advanced-OpenGL/Geometry-Shader#!
The focus of these chapters are on Modern OpenGL. Learning (and using) modern OpenGL requires a strong knowledge of graphics programming and how OpenGL operates under the hood to really get the best of your experience. So we will start by discussing core graphics aspects, how OpenGL actually draws pixels to your screen, and how we can leverage

https://www.classcentral.com/course/youtube-how-shaders-work-in-opengl-228984
This course teaches the fundamentals of how shaders work in OpenGL. By the end of the course, learners will understand the concepts of shaders, specifically vertex and fragment shaders. The course covers the differences between vertex and fragment shaders and their roles in OpenGL rendering. The teaching method involves a concise 18-minute

https://www.khronos.org/opengl/wiki/Fragment_Shader
The fragment shader is the OpenGL pipeline stage after a primitive is rasterized. For each sample of the pixels covered by a primitive, a "fragment" is generated. ... Shader Storage Buffer Object writes issued after the discard from working (such operations performed before the discard work as expected).

https://antongerdelan.net/opengl/compute.html
This article gives a practical introduction to OpenGL compute shaders, and we start building a toy ray-traced renderer. You should be familiar with basic OpenGL initialisation, and know how to render a texture to a full-screen quad before starting this tutorial. ... You define a fixed size of the work to complete in terms of number of jobs

https://www.khronos.org/opengl/wiki/Compute_Shader
The frequency at which a shader stage executes is specified by the nature of that stage; vertex shaders execute once per input vertex, for example (though some executions can be skipped via caching). Fragment shader execution is defined by the fragments generated from the rasterization process. Compute shaders work very differently.

https://open.gl/geometry
Since OpenGL 3.2 there is a third optional type of shader that sits between the vertex and fragment shaders, known as the geometry shader. This shader has the unique ability to create new geometry on the fly using the output of the vertex shader as input. Since we've neglected the kitten from the previous chapters for too long, it ran off to a

https://gamedev.stackexchange.com/questions/25904/how-do-multipass-shaders-work-in-opengl
There is no "theory" behind multipass. There are no "multipass shaders". Multipass is very simple: you draw the object with one program. Then you draw the object with a different program. You can use D3DX stuff like FX files to hide these extra passes. But they still work that way. OpenGL simply doesn't have a hiding place for it.

https://opentk.net/learn/chapter1/4-shaders.html
We will now explain shaders, and specifically the OpenGL Shading Language, in a more general fashion. GLSL. ... It is easier to understand and saves you (and OpenGL) some work. The other exception is that the fragment shader requires a vec4 color output variable, since the fragment shaders needs to generate a final output color.

https://www.youtube.com/watch?v=yrFo1_Izlk0
Join the Discord: https://discord.gg/4tHeAkxNg7Follow me on Twitch: https://www.twitch.tv/gameswthgabeIn this episode I do a deep dive into the code and conc

https://stackoverflow.com/questions/17972051/proper-way-to-manage-shaders-in-opengl
I've ended up having models, materials, etc. each have a handle to the shader so they can do things like glUniform1f(shader->getKdLocation(),kd), but this kind of hot potato seems like bad design to me. I've seen tutorials where uniforms and ins and outs are hardcoded in the shader (eg layout = 0) and then just bound with glUniform1f(0,kd

https://unity.com/blog/engine-platform/shader-variants-optimization-troubleshooting-tips
For example, on OpenGL, the OpenGL ES and Vulkan suffixes will be ignored. You can use the directive #pragma skip_variants to define keywords that should be excluded when generating variants for that specific shader. When making your player build, all shader variants for that shader containing one of those keywords will be skipped.

https://stackoverflow.com/questions/867653/how-to-implement-grayscale-rendering-in-opengl
2. If you're working against a modern-enough OpenGL, I would say pixel shaders is a very suitable solution here. Either by hooking into each polygon's shading as they render, or by doing a single full-screen quad in a second pass that just reads each pixel, converts to grayscale, and writes it back.

https://stackoverflow.com/questions/30982539/opengl-defining-variables-in-shaders
9. My OpenGL program, using GLSL for shaders, has a simple vertex and fragment shader (given by a tutorial). The vertex shader is: gl_Position = vec4(0.5 * Position.x, 0.5 * Position.y, Position.z, 1.0); And the fragment shader is: FragColor = vec4(1.0, 0.0, 0.0, 1.0); What is happening here is that the vertex shader divides the vertex

https://stackoverflow.com/questions/78664551/opengl-depth-test-with-unclamped-range
I'm using a OpenGL pipeline with a vertex and fragment shader, which is such that early fragment tests need to be enabled. So the depth test is always done with the vertex shader output gl_Position.z which (after perspective divide) need to be between -1 and +1. So the vertex shader needs to normalize the Z values of the vertices from their full possible range to [-1, +1].