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basic shader questions

Graphics and GPU Programming Programming

Started by MikeCyber April 25, 2020 03:15 PM

1 comment, last by cozzie 4 years, 2 months ago

MikeCyber

Author

April 25, 2020 03:15 PM

as a shader newbie, I want to use a existing shader but don't understand to begin those:

// textures

uniform sampler2D u_textureFg;

uniform sampler2D u_textureBg;

…

// alpha-blends two colors

vec4 blend(vec4 bg,vec4 fg){

…

How should I give a loaded texture to for ex:

uniform sampler2D u_textureBg;

Why is it later only named bg and not u_textureBg?

Many thanks

cozzie

5,064

May 01, 2020 09:10 PM

You might need to start with some HLSL basics, for example this could work: http://rbwhitaker.wikidot.com/hlsl-tutorials

Answering your question(s):

uniform means you can update it from outside the shader
the names of variables can be many things ?
the vec4 bg is a 4d vector, the u_textureBg is a texture sampler, which is used to determine how the texels of a texture are sampled