Pass from vertex shader to fragment shader

Question

I'm trying to send some vectors from vertex shader to fragment shader: ex:

vec3 N = (view*model*vNormal).xyz

and when trying to reach it in fragment shader:

Link errorERROR: Input of fragment shader 'N' not written by vertex shader

any ideas?

datenwolf · Accepted Answer · 2012-12-04 23:51:43Z

3

To pass values between shader stages you must use so called varyings; the keywords are varying or out and in – there was a keyword change between GLSL 1.20 to 1.40 but the basic gist that you need special type qualifiers. See http://www.opengl.org/wiki/GLSL_Type_Qualifiers#Shader_stage_inputs_and_outputs for the details.

answered Dec 4, 2012 at 23:51

datenwolf

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2 Comments

mjanisz1 Over a year ago

ofc in vector shader I use out vec3 N and in fs in vec3 N but it doesnt help

Nicol Bolas Over a year ago

@mjanisz1: You said your code was vec3 N = .... In this code, N is a local variable. You need to declare shader stage inputs/outputs globally.

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