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/*
* render.c
*
* Created on: 15.01.2018
* Author: Superleo1810
*/
#include "render.h"
#define HAVE_STRUCT_TIMESPEC
#include <pthread.h>
void render_init(Config *config, u32 (*sfunc) (long double, long double, u32))
{
delta = glutGet(GLUT_ELAPSED_TIME);
x_min_s = -2.0;
x_max_s = 1.0;
y_min_s= -1.0;
y_max_s = 1.0;
x_min = x_min_s;
x_max = x_max_s;
y_min = y_min_s;
y_max = y_max_s;
_config = config;
_sfunc = sfunc;
s_arr = (u32 *) malloc((_config->width) * (_config->height) * sizeof(u32));
calculate(x_min, y_min, x_max, y_max, _sfunc, s_arr);
//glutInit(0, NULL);
glutInitWindowPosition(0, 0);
glutInitWindowSize(_config->width, _config->height);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("Renderer");
glutDisplayFunc(gl_render);
glutIdleFunc(gl_idle);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, _config->width, _config->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, s_arr);
glBindTexture(GL_TEXTURE_2D, 0);
//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, _config->width, _config->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, s_arr);
glMatrixMode(GL_PROJECTION);
glOrtho(0, _config->width, 0, _config->height, -1, 1);
glMatrixMode(GL_MODELVIEW);
glutMainLoop();
}
void render_show()
{
}
void gl_render(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D, tex);
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
glTexCoord2i(0, 0); glVertex2i(0, 0);
glTexCoord2i(0, 1); glVertex2i(0, _config->height);
glTexCoord2i(1, 1); glVertex2i(_config->width, _config->height);
glTexCoord2i(1, 0); glVertex2i(_config->width, 0);
glEnd();
glDisable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
// glBegin(GL_TRIANGLES);
// glVertex3f(-0.5,-0.5,0.0);
// glVertex3f(0.5,0.0,0.0);
// glVertex3f(0.0,0.5,0.0);
// glEnd();
glutSwapBuffers();
}
void calculate(long double x_min, long double y_min, long double x_max, long double y_max, u32 (*sfunc) (long double, long double, u32), u32 *arr)
{
pthread_t thread;
ThreadArgs *args = (ThreadArgs *) malloc(_config->threads * sizeof(ThreadArgs));
for(u8 i = 0; i < _config->threads; i++)
{
args[i] = (ThreadArgs) { .tc = _config->threads, .tid = i, .x_min = x_min, .y_min = y_min, .x_max = x_max, .y_max = y_max, .sfunc = sfunc, .arr = arr };
pthread_create(&thread, NULL, calculate_t, (void *)&args[i]);
}
pthread_join(thread, NULL);
}
void calculate_t(void *args)
{
ThreadArgs *_args = (ThreadArgs *)args;
long double x_math, y_math;
u32 iterations;
for (u32 y = (_config->height/_args->tc)*(_args->tid); y < _config->height; y++)
{
for (u32 x = 0; x < _config->width; x++)
{
x_math = _args->x_min + ((long double) x * (_args->x_max - _args->x_min)) / _config->width;
y_math = _args->y_min + ((long double) (_config->height - y) * (_args->y_max - _args->y_min)) / _config->height;
iterations = _args->sfunc(x_math, y_math, _config->iterations);
_args->arr[COORDS(x, y, _config->width)] = (((1<<24)-1)*iterations)/_config->iterations;
}
}
}
long double zoom_func(long double ft, long double s)
{
return (s - expl(-ft));
}
void gl_idle(void)
{
calculate(x_min, y_min, x_max, y_max, _sfunc, s_arr);
//glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, _config->width, _config->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, s_arr);
glBindTexture(GL_TEXTURE_2D, 0);
int t = glutGet(GLUT_ELAPSED_TIME);
dt = (t - delta) / 1000.0;
delta = t;
ft+=(0.1*dt);
x_min = x_min_s + zoom_func(ft, (long double)2.0 + _config->to_x);
y_min = y_min_s + zoom_func(ft, (long double)1.0 + _config->to_y);
x_max = x_max_s - zoom_func(ft, (long double)1.0 - _config->to_x);
y_max = y_max_s - zoom_func(ft, (long double)1.0 - _config->to_y);
glutPostRedisplay();
}
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