Top "Shader" questions

Constant float values in GLSL shaders - any reason to use uniforms?

I'm looking at the source of an OpenGL application that uses shaders. One particular shader looks like this: uniform float …

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OpenGL ES 2.0 Shader best practices

I've been searching for examples of shaders in OpenGL and I've seen some varying styles. Some shaders specifically use the …

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Speed of cos() and sin() function in GLSL shaders?

I'm interested in information about the speed of sin() and cos() in Open GL Shader Language. The GLSL Specification Document …

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WebGL/GLSL - How does a ShaderToy work?

I've been knocking around Shadertoy - https://www.shadertoy.com/ - recently, in an effort to learn more about OpenGL …

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OpenGL - How to access depth buffer values? - Or: gl_FragCoord.z vs. Rendering depth to texture

I want to access the depth buffer value at the currently processed pixel in a pixel shader. How can we …

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Why does my OpenGL Phong shader behave like a flat shader?

I've been learning OpenGL for the past couple of weeks and I've run into some trouble implementing a Phong shader. …

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draw the depth value in opengl using shaders

I want to draw the depth buffer in the fragment shader, I do this: Vertex shader: varying vec4 position_; gl_…

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What is the relationship between gl_Color and gl_FrontColor in both vertex and fragment shaders

I have pass-through vertex and fragment shaders. vertex shader void main(void) { gl_TexCoord[0] = gl_MultiTexCoord0; gl_Position = gl_ModelViewProjectionMatrix * …

opengl shader pixel-shader vertex-shader

What can cause glDrawArrays to generate a GL_INVALID_OPERATION error?

I've been attempting to write a two-pass GPU implementation of the Marching Cubes algorithm, similar to the one detailed in …

opengl glsl shader geometry-shader marching-cubes

"flat" qualifier in glsl?

So I was reading "The Official OpenGL Guide" and in a section where they taught material lighting, they suddenly used …

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