CODEWITHSUNDEEP
glslpyopengl
Donny
Donny

Reputation: 559

glsl pyOpenGL array passing

I'm currently playing around with glsl. For that purpose i need to pass an array from the opengl code to the gsls, which then in return calculates a new color out of the array. But somehow this doesn't work for me. Instead of getting the whole array I'm always stuck with only the first entry. Could you help me by saying what I'm doing wrong?

import numpy as np
\\...
array = np.array([1.2,2.5,3.8,4.3,5.6, #....])
location = glGetUniformLocation(program,"arrayInShader")
glUniform1fv(location,1,array)

and in the shader:

uniform float arrayInShader[5];
varying vec3 color;
void main()
{
    color.r=arrayInShader[0]+arrayInShader[1];
    color.g=arrayInShader[2];
    color.b=arrayInShader[3]+arrayInShader[4];
}

Thanks a lot guys!

Upvotes: 4

Views: 1595

Answers (1)

Nicol Bolas
Nicol Bolas

Reputation: 473946

The second parameter of glUniform*v is the count. The number of elements to upload. You say that you're only loading 1 float into the array, so OpenGL only loads one float into the array.

Upvotes: 6

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