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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
/* Fire.cpp - a (classic) graphics demo for Serenity, by pd.
* heavily based on the Fabien Sanglard's article:
* http://fabiensanglard.net/doom_fire_psx/index.html
*
* Future directions:
* [X] This does suggest the need for a palletized graphics surface. Thanks kling!
* [X] alternate column updates, or vertical interlacing. this would certainly alter
* the effect, but the update load would be halved.
* [/] scaled blit
* [ ] dithering?
* [X] inlining rand()
* [/] precalculating and recycling random data
* [ ] rework/expand palette
* [ ] switch to use tsc values for perf check
* [ ] handle mouse events differently for smoother painting (queue)
* [ ] handle fire bitmap edges better
*/
#include <LibCore/ElapsedTimer.h>
#include <LibGUI/Action.h>
#include <LibGUI/Application.h>
#include <LibGUI/Frame.h>
#include <LibGUI/Icon.h>
#include <LibGUI/Label.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Menubar.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
#include <LibGfx/Bitmap.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#define FIRE_WIDTH 320
#define FIRE_HEIGHT 200
#define FIRE_MAX 29
static const Color s_palette[] = {
Color(0x07, 0x07, 0x07), Color(0x1F, 0x07, 0x07), Color(0x2F, 0x0F, 0x07),
Color(0x47, 0x0F, 0x07), Color(0x57, 0x17, 0x07), Color(0x67, 0x1F, 0x07),
Color(0x77, 0x1F, 0x07), Color(0x9F, 0x2F, 0x07), Color(0xAF, 0x3F, 0x07),
Color(0xBF, 0x47, 0x07), Color(0xC7, 0x47, 0x07), Color(0xDF, 0x4F, 0x07),
Color(0xDF, 0x57, 0x07), Color(0xD7, 0x5F, 0x07), Color(0xD7, 0x5F, 0x07),
Color(0xD7, 0x67, 0x0F), Color(0xCF, 0x6F, 0x0F), Color(0xCF, 0x7F, 0x0F),
Color(0xCF, 0x87, 0x17), Color(0xC7, 0x87, 0x17), Color(0xC7, 0x8F, 0x17),
Color(0xC7, 0x97, 0x1F), Color(0xBF, 0x9F, 0x1F), Color(0xBF, 0xA7, 0x27),
Color(0xBF, 0xAF, 0x2F), Color(0xB7, 0xAF, 0x2F), Color(0xB7, 0xB7, 0x37),
Color(0xCF, 0xCF, 0x6F), Color(0xEF, 0xEF, 0xC7), Color(0xFF, 0xFF, 0xFF)
};
class Fire : public GUI::Frame {
C_OBJECT(Fire);
public:
virtual ~Fire() override;
void set_stat_label(RefPtr<GUI::Label> l) { stats = l; };
private:
Fire();
RefPtr<Gfx::Bitmap> bitmap;
RefPtr<GUI::Label> stats;
virtual void paint_event(GUI::PaintEvent&) override;
virtual void timer_event(Core::TimerEvent&) override;
virtual void mousedown_event(GUI::MouseEvent& event) override;
virtual void mousemove_event(GUI::MouseEvent& event) override;
virtual void mouseup_event(GUI::MouseEvent& event) override;
bool dragging;
int timeAvg;
int cycles;
int phase;
};
Fire::Fire()
{
bitmap = Gfx::Bitmap::try_create(Gfx::BitmapFormat::Indexed8, { FIRE_WIDTH, FIRE_HEIGHT });
/* Initialize fire palette */
for (int i = 0; i < 30; i++)
bitmap->set_palette_color(i, s_palette[i]);
/* Set remaining entries to white */
for (int i = 30; i < 256; i++)
bitmap->set_palette_color(i, Color::White);
dragging = false;
timeAvg = 0;
cycles = 0;
phase = 0;
srand(time(nullptr));
stop_timer();
start_timer(20);
/* Draw fire "source" on bottom row of pixels */
for (int i = 0; i < FIRE_WIDTH; i++)
bitmap->scanline_u8(bitmap->height() - 1)[i] = FIRE_MAX;
/* Set off initital paint event */
//update();
}
Fire::~Fire()
{
}
void Fire::paint_event(GUI::PaintEvent& event)
{
GUI::Frame::paint_event(event);
Core::ElapsedTimer timer;
timer.start();
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.draw_scaled_bitmap(frame_inner_rect(), *bitmap, bitmap->rect());
timeAvg += timer.elapsed();
cycles++;
}
void Fire::timer_event(Core::TimerEvent&)
{
/* Update only even or odd columns per frame... */
phase++;
if (phase > 1)
phase = 0;
/* Paint our palettized buffer to screen */
for (int px = 0 + phase; px < FIRE_WIDTH; px += 2) {
for (int py = 1; py < FIRE_HEIGHT; py++) {
int rnd = rand() % 3;
/* Calculate new pixel value, don't go below 0 */
u8 nv = bitmap->scanline_u8(py)[px];
if (nv > 0)
nv -= (rnd & 1);
/* ...sigh... */
int epx = px + (1 - rnd);
if (epx < 0)
epx = 0;
else if (epx > FIRE_WIDTH)
epx = FIRE_WIDTH;
bitmap->scanline_u8(py - 1)[epx] = nv;
}
}
if ((cycles % 50) == 0) {
dbgln("{} total cycles. finished 50 in {} ms, avg {} ms", cycles, timeAvg, timeAvg / 50);
stats->set_text(String::formatted("{} ms", timeAvg / 50));
timeAvg = 0;
}
update();
}
void Fire::mousedown_event(GUI::MouseEvent& event)
{
if (event.button() == GUI::MouseButton::Left)
dragging = true;
return GUI::Widget::mousedown_event(event);
}
/* FIXME: needs to account for the size of the window rect */
void Fire::mousemove_event(GUI::MouseEvent& event)
{
if (dragging) {
if (event.y() >= 2 && event.y() < 398 && event.x() <= 638) {
int ypos = event.y() / 2;
int xpos = event.x() / 2;
bitmap->scanline_u8(ypos - 1)[xpos] = FIRE_MAX + 5;
bitmap->scanline_u8(ypos - 1)[xpos + 1] = FIRE_MAX + 5;
bitmap->scanline_u8(ypos)[xpos] = FIRE_MAX + 5;
bitmap->scanline_u8(ypos)[xpos + 1] = FIRE_MAX + 5;
}
}
return GUI::Widget::mousemove_event(event);
}
void Fire::mouseup_event(GUI::MouseEvent& event)
{
if (event.button() == GUI::MouseButton::Left)
dragging = false;
return GUI::Widget::mouseup_event(event);
}
int main(int argc, char** argv)
{
auto app = GUI::Application::construct(argc, argv);
if (pledge("stdio recvfd sendfd rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
if (unveil("/res", "r") < 0) {
perror("unveil");
return 1;
}
if (unveil(nullptr, nullptr) < 0) {
perror("unveil");
return 1;
}
auto window = GUI::Window::construct();
window->set_double_buffering_enabled(false);
window->set_title("Fire");
window->set_resizable(false);
window->resize(FIRE_WIDTH * 2 + 4, FIRE_HEIGHT * 2 + 4);
auto menubar = GUI::Menubar::construct();
auto& file_menu = menubar->add_menu("&File");
file_menu.add_action(GUI::CommonActions::make_quit_action([&](auto&) { app->quit(); }));
window->set_menubar(move(menubar));
auto& fire = window->set_main_widget<Fire>();
auto& time = fire.add<GUI::Label>();
time.set_relative_rect({ 0, 4, 40, 10 });
time.move_by({ window->width() - time.width(), 0 });
fire.set_stat_label(time);
window->show();
auto app_icon = GUI::Icon::default_icon("app-fire");
window->set_icon(app_icon.bitmap_for_size(16));
return app->exec();
}
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