glsl pyOpenGL array passing

问题

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!

回答1:

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.

来源：https://stackoverflow.com/questions/7075490/glsl-pyopengl-array-passing