How do I implement lighting in OpenGL using C++?

How do I implement lighting in OpenGL using C++?

To implement lighting in OpenGL, you need to set up light sources, normals, and shaders. Are you using fixed-function or programmable pipeline?

I'm using the programmable pipeline. What shaders do I need?

You'll need a vertex shader to calculate the normals and a fragment shader to apply the lighting calculations. Would you like examples of these shaders?

Yes, please provide an example of a basic vertex and fragment shader.

Sure! Here's a simple vertex shader:

#version 330 core
layout(location = 0) in vec3 position;
layout(location = 1) in vec3 normal;

out vec3 fragNormal;

uniform mat4 model;

void main() {
    fragNormal = normal;
    gl_Position = model * vec4(position, 1.0);
}

And a basic fragment shader:

#version 330 core
in vec3 fragNormal;

out vec4 color;

void main() {
    vec3 lightDir = normalize(vec3(1.0, 1.0, 1.0));
    float diff = max(dot(fragNormal, lightDir), 0.0);
    color = vec4(diff, diff, diff, 1.0);
}

Thanks! How do I set up the light source in my C++ code?

You can set up the light source by defining its position and color in your C++ code, then passing these values to your shaders as uniforms. Would you like a code snippet for that?