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//
// lager - library for functional interactive c++ programs
// Copyright (C) 2017 Juan Pedro Bolivar Puente
//
// This file is part of lager.
//
// lager is free software: you can redistribute it and/or modify
// it under the terms of the MIT License, as detailed in the LICENSE
// file located at the root of this source code distribution,
// or here: <https://github.com/arximboldi/lager/blob/master/LICENSE>
//
#include "../autopong.hpp"
#include <SDL.h>
#include <SDL_ttf.h>
#include <lager/debug/debugger.hpp>
#include <lager/debug/http_server.hpp>
#include <lager/event_loop/sdl.hpp>
#include <lager/resources_path.hpp>
#include <lager/store.hpp>
#include <cereal/types/complex.hpp>
#include <lager/extra/cereal/struct.hpp>
#include <cmath>
#include <iostream>
#include <string>
#include <variant>
constexpr auto font_size = 32;
std::string font_path()
{
using namespace std::string_literals;
return lager::resources_path() + "/SourceSansPro-Bold.ttf"s;
}
struct sdl_view
{
SDL_Window* window = SDL_CreateWindow("Lager Counter Example",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
autopong::window_width,
autopong::window_height,
SDL_WINDOW_SHOWN);
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);
TTF_Font* font = TTF_OpenFont(font_path().c_str(), font_size);
};
void draw(sdl_view& v, autopong::model g)
{
using namespace autopong;
SDL_RenderClear(v.renderer);
// render background
{
SDL_SetRenderDrawColor(v.renderer, 0, 0, 0, 255);
auto rect = SDL_Rect{0, 0, window_width, window_height};
SDL_RenderFillRect(v.renderer, &rect);
}
// render text
{
auto c = (std::uint8_t)(255 *
(1 - std::cos(g.death_anim * M_PI - M_PI / 2)));
auto msg = std::to_string(g.score);
auto surf =
TTF_RenderText_Blended(v.font, msg.c_str(), {255, c, c, 255});
auto text = SDL_CreateTextureFromSurface(v.renderer, surf);
SDL_FreeSurface(surf);
auto rect = SDL_Rect{2 * padding, 2 * padding - font_size / 3};
SDL_QueryTexture(text, nullptr, nullptr, &rect.w, &rect.h);
SDL_RenderCopy(v.renderer, text, nullptr, &rect);
if (g.max_score) {
auto msg = std::to_string(g.max_score);
auto surf =
TTF_RenderText_Blended(v.font, msg.c_str(), {255, c, c, 255});
auto text = SDL_CreateTextureFromSurface(v.renderer, surf);
SDL_FreeSurface(surf);
auto rect = SDL_Rect{2 * padding, 2 * padding - font_size / 3};
SDL_QueryTexture(text, nullptr, nullptr, &rect.w, &rect.h);
rect.x = window_width - rect.x - rect.w;
SDL_RenderCopy(v.renderer, text, nullptr, &rect);
}
}
// render border
{
auto c = (std::uint8_t)(255 *
(1 - std::cos(g.death_anim * M_PI - M_PI / 2)));
SDL_SetRenderDrawColor(v.renderer, 255, c, c, 255);
auto rect = SDL_Rect{padding - border,
padding - border,
window_width - 2 * padding + 2 * border,
window_height - 2 * padding + 2 * border};
for (auto i = 0; i < border;
++i, ++rect.x, ++rect.y, ----rect.w, ----rect.h)
SDL_RenderDrawRect(v.renderer, &rect);
}
// render game
{
auto rect = SDL_Rect{
padding,
padding,
window_width - 2 * padding,
window_height - 2 * padding,
};
auto c =
(std::uint8_t)(255 * (1. - std::sin(g.bounce_anim * M_PI / 2)));
SDL_RenderSetClipRect(v.renderer, &rect);
SDL_SetRenderDrawColor(v.renderer, 255, c, c, 255);
// paddle
{
auto rect = SDL_Rect{
(int) g.paddle_x, paddle_y, paddle_width, paddle_height};
SDL_RenderFillRect(v.renderer, &rect);
}
// ball
{
auto rect = SDL_Rect{(int) x(g.ball) - ball_r,
(int) y(g.ball) - ball_r,
ball_r * 2,
ball_r * 2};
SDL_RenderFillRect(v.renderer, &rect);
}
SDL_RenderSetClipRect(v.renderer, nullptr);
}
SDL_RenderPresent(v.renderer);
}
std::optional<autopong::action> intent(const SDL_Event& event)
{
switch (event.type) {
case SDL_MOUSEMOTION:
return autopong::paddle_move_action{(float) event.motion.xrel};
default:
return std::nullopt;
}
}
int main(int argc, const char** argv)
{
using namespace std::placeholders;
SDL_Init(SDL_INIT_VIDEO);
TTF_Init();
SDL_SetRelativeMouseMode(SDL_TRUE);
#ifdef DEBUGGER
auto debugger =
lager::http_debug_server{argc, argv, 8080, lager::resources_path()};
#endif
auto view = sdl_view{};
auto loop = lager::sdl_event_loop{};
auto store =
lager::make_store<autopong::action>(autopong::model{},
lager::with_sdl_event_loop{loop},
#ifdef DEBUGGER
lager::with_debugger(debugger)
#else
lager::identity
#endif
);
watch(store, [&](auto&& val) { draw(view, LAGER_FWD(val)); });
loop.run(
[&](const SDL_Event& ev) {
if (auto act = intent(ev))
store.dispatch(*act);
return ev.type != SDL_QUIT;
},
[&](float delta) {
store.dispatch(autopong::tick_action{delta});
return true;
});
}
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