How to pass uniform array of struct to shader via C++ code

Question

for eg. in FragmentShader:-

struct LightSource
{
        int Type;
        vec3 Position;
        vec3 Attenuation;
        vec3 Direction;
        vec3 Color;
};

uniform LightSource Light[4];

main(){
        //somecode
}

Now how can i send values for Light[4].

Is this for OpenGL or OpenGL ES? In GL (3.1+), the best way to do this would be with a Uniform Buffer. — Andon M. Coleman
– Andon M. Coleman, Commented May 12, 2014 at 2:02
No, and that is why I was asking you to be more specific with your tags. You have this tagged for ES and GL. — Andon M. Coleman
– Andon M. Coleman, Commented May 17, 2014 at 0:55

SWdV · Accepted Answer · 2019-04-02 00:40:56Z

39

You will need to get the location of each field of the struct for each array element and send the value separately. See the OpenGL wiki page for reference: https://www.khronos.org/opengl/wiki/Uniform_(GLSL)#Uniform_management.

For example to set the value of Light[0].Type you would do the following:

GLuint loc = glGetUniformLocation(shader_program_id, "Light[0].Type");
glUniform1i(loc, value);

edited Apr 2, 2019 at 0:40

SWdV

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answered May 11, 2014 at 18:50

user3256930

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