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#include <SFML/Graphics.hpp>
int main() {
sf::Texture texture;
if(!texture.loadFromFile("flag.png"))
return 1;
texture.setSmooth(true);
sf::Vector2u window_size = texture.getSize();
sf::RenderWindow window(sf::VideoMode(window_size.x, window_size.y), "SFML works!", 0);
window.setVerticalSyncEnabled(true);
window.setFramerateLimit(24);
sf::Shader shader;
if(!shader.loadFromFile("flag.glsl", sf::Shader::Type::Fragment))
return 1;
shader.setUniform("texture", texture);
sf::Vertex vertex[4];
vertex[0] = sf::Vertex(sf::Vector2f(0.0f, 0.0f), sf::Color::White, sf::Vector2f(0.0f, 0.0f));
vertex[1] = sf::Vertex(sf::Vector2f(window_size.x, 0.0f), sf::Color::White, sf::Vector2f(1.0f, 0.0f));
vertex[2] = sf::Vertex(sf::Vector2f(window_size.x, window_size.y), sf::Color::White, sf::Vector2f(1.0f, 1.0f));
vertex[3] = sf::Vertex(sf::Vector2f(0.0f, window_size.y), sf::Color::White, sf::Vector2f(0.0f, 1.0f));
sf::Texture texture_output;
texture_output.create(texture.getSize().x, texture.getSize().y);
int flag_start_x = texture.getSize().x*0.2;
int flag_start_y = texture.getSize().y*0.2;
int flag_width = texture.getSize().x*0.6;
int flag_height = texture.getSize().y*0.6;
sf::Image output_image;
output_image.create(flag_width, flag_height, sf::Color::Transparent);
std::vector<sf::Image> frames;
sf::Clock timer;
while (window.isOpen()) {
sf::Event event;
while (window.pollEvent(event)) {
if (event.type == sf::Event::Closed)
window.close();
}
shader.setUniform("iTime", timer.getElapsedTime().asSeconds());
window.clear(sf::Color::Transparent);
window.draw(vertex, 4, sf::PrimitiveType::Quads, &shader);
window.display();
texture_output.update(window);
sf::Image image = texture_output.copyToImage();
output_image.copy(image, 0, 0, sf::IntRect(flag_start_x, flag_start_y, flag_width, flag_height), false);
frames.push_back(std::move(output_image));
}
system("rm -rf frames/*; mkdir frames");
for(size_t i = 0; i < frames.size(); ++i) {
frames[i].saveToFile("frames/" + std::to_string(i) + ".png");
}
system("ffmpeg -i \"frames/%d.png\" -framerate 24 -filter_complex \"fps=24,split=2[palette_in][gif];[palette_in]palettegen[palette_out];[gif]fifo[gif_fifo]; [gif_fifo][palette_out]paletteuse\" -y frames/output.gif");
return 0;
}
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