mesh.hpp

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#pragma once
 
#include <glad/glad.h>
#include <vector>
 
namespace solarsim {
    
    struct Mesh {
        uint32_t vao = 0;
        uint32_t vbo = 0;
        uint32_t ebo = 0;
        uint32_t vertexCount = 0;

        GLenum drawMode = GL_TRIANGLES;
        bool useElements = false;

        bool useNormals = true;

        std::vector<float> vertices;
        std::vector<uint32_t> indices;

        void setupBuffers() {
            glGenVertexArrays(1, &vao);
            glBindVertexArray(vao);
 
            glGenBuffers(1, &vbo);
            glBindBuffer(GL_ARRAY_BUFFER, vbo);
            glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(float), vertices.data(), GL_STATIC_DRAW);
 
            if (useElements && !indices.empty()) {
                glGenBuffers(1, &ebo);
                glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
                glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(uint32_t), indices.data(), GL_STATIC_DRAW);
            }
 
            size_t fields = useNormals ? 2 : 1;
            size_t stride = fields * 3;
 
            // TODO: Add more vertex data
            glEnableVertexAttribArray(0);
            glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, stride * sizeof(float), (void*)0);
 
            if (useNormals) {
                glEnableVertexAttribArray(1);
                glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, stride * sizeof(float), (void*)(3 * sizeof(float)));
            }
 
            glBindVertexArray(0);
        }
    };
}