rcpp_framework/rendering/opengl/sprite.cpp

#include "sprite.h"

void Sprite::render() {
    mesh_instance->position.x = position.x;
    mesh_instance->position.y = position.y;

    mesh_instance->rotation.z = rotation;

    mesh_instance->scale.x = scale.x;
    mesh_instance->scale.y = scale.y;

    mesh_instance->render();
}

void Sprite::update_mesh() {
    Mesh *mesh = mesh_instance->mesh;

    mesh->clear();

    float w2 = width / 2.0;
    float h2 = height / 2.0;

    mesh->add_uv(region_x, region_y);
    mesh->add_vertex2(-w2, h2);

    mesh->add_uv(region_x + region_width, region_y + region_height);
    mesh->add_vertex2(w2, -h2);

    mesh->add_uv(region_x, region_y + region_height);
    mesh->add_vertex2(-w2, -h2);

    mesh->add_uv(region_x + region_width, region_y);
    mesh->add_vertex2(w2, h2);

    mesh->add_triangle(1, 0, 2);
    mesh->add_triangle(0, 1, 3);

    mesh->upload();
}

Sprite::Sprite() : Object2D() {
    mesh_instance = new MeshInstance();
    mesh_instance->mesh = new Mesh(2);

    width = 1;
    height = 1;

    region_x = 0;
    region_y = 0;
    region_width = 1;
    region_height = 1;
}

Sprite::~Sprite() {
    delete mesh_instance->mesh;
    delete mesh_instance;
}