Hi everyone, I’m new to the forum and already in need of some help 
I’ve been messing around trying to learn GLSL and do some simple shaders and got to a point where there’s
a number of point lights I need to pass to the shader in order to iterate through them via for loop.
If I understand correctly what’s noted in glsl manual section it should be possible to have an array of LightSourceParameters structs and then access individual light parameter through an index?
As in:
p3d_LightSource[i].position
p3d_LightSource[i].ambient
...I’ve tried to set it up like this but it doesn’t seem to work 
//multiple_lights.vert
#version 430
layout (location = 0) in vec3 p3d_Vertex;
layout (location = 1) in vec3 p3d_Normal;
out vec3 Color;
uniform struct p3d_LightSourceParameters {
vec4 position;
vec4 color;
} p3d_LightSource[3];
uniform struct {
vec4 ambient;
vec4 diffuse;
vec3 specular;
float shininess;
} p3d_Material;
uniform mat4 p3d_ModelViewMatrix;
uniform mat3 p3d_NormalMatrix;
uniform mat4 p3d_ProjectionMatrix;
const int NumEnabledLights = 3;
vec3 ads( int lightIndex, vec4 position, vec3 norm )
{
vec3 s = normalize( vec3(p3d_LightSource[lightIndex].position - position) );
vec3 v = normalize(vec3(-position));
vec3 r = reflect( -s, norm );
vec3 I = vec3(p3d_LightSource[lightIndex].color);
return
I * ( p3d_Material.ambient.xyz +
p3d_Material.diffuse.xyz * max( dot(s, norm), 0.0 ) +
p3d_Material.specular * pow( max( dot(r,v), 0.0 ), p3d_Material.shininess ) );
}
void main()
{
vec3 eyeNorm = normalize( p3d_NormalMatrix * p3d_Normal);
vec4 eyePosition = p3d_ModelViewMatrix * vec4(p3d_Vertex, 1.0);
Color = vec3(0.0);
for( int i = 0; i < NumEnabledLights; i++ )
Color += ads( i, eyePosition, eyeNorm );
gl_Position = p3d_ProjectionMatrix * p3d_ModelViewMatrix * vec4(p3d_Vertex, 1.0);
}here’s the log:
:display:gsg:glgsg(error): Unrecognized uniform name 'p3d_LightSource[0].color'!
:display:gsg:glgsg(error): Unrecognized uniform name 'p3d_LightSource[0].position'!
:display:gsg:glgsg(error): Unrecognized uniform name 'p3d_LightSource[1].color'!
:display:gsg:glgsg(error): Unrecognized uniform name 'p3d_LightSource[1].position'!
:display:gsg:glgsg(error): Unrecognized uniform name 'p3d_LightSource[2].color'!
:display:gsg:glgsg(error): Unrecognized uniform name 'p3d_LightSource[2].position'!I’m not sure what I’m doing wrong, it’d be awesome if someone has an idea how to fix this.
