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/*-
* Copyright (C) 2025 Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
*
* This file is part of Tris Game.
*
* Tris Game is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tris Game is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tris Game. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <GL/gl.h>
#include "engine.h"
#include "../util.h"
#include "ui/ui.h"
#include "../util/list.h"
#ifdef X11
#include <X11/Xlib.h>
#endif
#define RANGE_GL 2.0f
static float xstep;
static float ystep;
static int width;
static int height;
static list_t *lines = NULL;
typedef struct Line {
int x1, y1, x2, y2;
} Line;
typedef struct Engine {
UI *ui;
void (*draw_frame)();
} Engine;
static Engine *engine;
/* FPS */
static time_t start;
static int frames;
static time_t end;
void (*dispatch_ui_event)(int);
void (*on_mouse_pressed)();
void
engine_init(int w, int h)
{
engine = malloc(sizeof(Engine));
if (engine == NULL) {
log_error("Error allocating memory for engine");
exit(EXIT_FAILURE);
}
width = w;
height = h;
engine->ui = ui_init(w, h);
xstep = RANGE_GL / (float) w;
ystep = RANGE_GL / (float) h;
lines = list_create();
}
static Line *
engine_new_line(int x1, int y1, int x2, int y2)
{
Line *line = malloc(sizeof(Line));
line->x1 = x1;
line->y1 = y1;
line->x2 = x2;
line->y2 = y2;
return line;
}
void
engine_draw_line(int x1, int y1, int x2, int y2)
{
if (lines != NULL) {
Line *line = engine_new_line(x1, y1, x2, y2);
list_add(lines, line);
}
}
static void
engine_calculate_fps()
{
frames ++;
end = time(NULL);
if (end - start >= 1.0) {
printf("FPS: %d\n", frames);
frames = 0;
start = time(NULL);
}
}
static void
render_line(Line *line)
{
float _x1 = line->x1 * xstep - 1; float _y1 = (height - line->y1) * ystep - 1;
float _x2 = line->x2 * xstep - 1; float _y2 = (height - line->y2) * ystep - 1;
glVertex2f(_x1, _y1);
glVertex2f(_x2, _y2);
}
static void
draw_lines()
{
if (lines == NULL || lines->size <= 0) return;
glLineWidth(5.0f);
glBegin(GL_LINES);
glColor3f(1.0f, 1.0f, 0.0f); /* Yellow */
list_node_t *current = lines->head;
do {
render_line((Line *) current->data);
current = current->next;
} while (current != NULL);
glEnd();
}
static void
draw_frames()
{
glClearColor(0.0f, 0.0f, 0.2f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
draw_lines();
engine_calculate_fps();
}
void
engine_loop(void)
{
ui_set_loop_listener(draw_frames);
/* FPS calculation */
start = time(NULL);
frames = 0;
ui_loop();
}
void
engine_on_mouse_pressed(void (*event)())
{
on_mouse_pressed = event;
}
static void
engine_dispatch_ui_events(int type)
{
int event_type = 0;
switch (type) {
#ifdef X11
case ButtonPress:
event_type = ENGINE_MOUSE_PRESSED;
if (on_mouse_pressed != NULL) {
on_mouse_pressed();
}
break;
#endif
default:
event_type = 0;
break;
}
dispatch_ui_event(event_type);
}
void
engine_input(void (*f_input)(int engine_input))
{
ui_set_generic_listener(engine_dispatch_ui_events);
dispatch_ui_event = f_input;
}
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