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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 <time.h>
#include <GL/gl.h>
#include "../ui/ui.h"
#define RANGE_GL 2.0f
static float xstep;
static float ystep;
static int width;
static int height;
typedef struct Engine {
void (*draw_frame)();
} Engine;
static Engine engine;
/* FPS */
static time_t start;
static int frames;
static time_t end;
void
engine_init(int w, int h)
{
width = w;
height = h;
ui_init(w, h);
xstep = RANGE_GL / (float) w;
ystep = RANGE_GL / (float) h;
}
void
engine_draw_line(int x1, int y1, int x2, int y2)
{
float _x1 = x1 * xstep - 1; float _y1 = (height - y1) * ystep - 1;
float _x2 = x2 * xstep - 1; float _y2 = (height - y2) * ystep - 1;
glVertex2f(_x1, _y1);
glVertex2f(_x2, _y2);
}
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
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);
engine.draw_frame();
engine_calculate_fps();
}
void
engine_loop(void (*draw_frame)())
{
engine.draw_frame = draw_frame;
ui_set_loop_listener(draw_frames);
/* FPS calculation */
start = time(NULL);
frames = 0;
ui_loop();
}
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