void Renderer::flush() {
    if (vertices.size() > 0) {
        glBindTexture(GL_TEXTURE_2D, texManager->getTexture(currentTexture).getID());
        normal->setInt("image", 0);
        glBindBuffer(GL_ARRAY_BUFFER, VBO);
        glBufferData(GL_ARRAY_BUFFER, sizeof(texVec2) * vertices.size(), &vertices[0], GL_STATIC_DRAW);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, IBO);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(unsigned int) * indices.size(), &indices[0], GL_STATIC_DRAW);
        glBindVertexArray(VAO);
        glEnableVertexAttribArray(0);
        glEnableVertexAttribArray(1);
        glEnableVertexAttribArray(2);
        glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(texVec2), NULL);
        glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, sizeof(texVec2), (void*)(2 * sizeof(float)));
        glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(texVec2), (void*)(6 * sizeof(float)));
        glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);
        indices.clear();
        vertices.clear();
    }
    fontManager->flushFonts();
}

void Renderer::renderTexture(Sprite sprite, BBox destination, BBox source, Color color) {
    if (currentTexture != sprite.getName()) {
        flush();
        currentTexture = sprite.getName();
    }

    if (destination.x + destination.w < 0 || destination.y + destination.h < 0 || destination.x > m_data.width || destination.y > m_data.height) return;
    if (source.w == 0.0f && source.h == 0.0f) {
        source.w = sprite.getWidth();
        source.h = sprite.getHeight();
    }
    int i = vertices.size();
    indices.push_back(i + 0);
    indices.push_back(i + 1);
    indices.push_back(i + 3);
    indices.push_back(i + 1);
    indices.push_back(i + 2);
    indices.push_back(i + 3);
    vertices.push_back(texVec2(destination.x + destination.w, destination.y, color.r, color.g, color.b, color.a, source.x + source.w, source.y));
    vertices.push_back(texVec2(destination.x + destination.w, destination.y + destination.h, color.r, color.g, color.b, color.a, source.x + source.w, source.y + source.h));
    vertices.push_back(texVec2(destination.x, destination.y + destination.h, color.r, color.g, color.b, color.a, source.x, source.y + source.h));
    vertices.push_back(texVec2(destination.x, destination.y, color.r, color.g, color.b, color.a, source.x, source.y));
}