#include "common.h"

#include <GL/gl.h>

#include <GL/glu.h>

int window; // GLUT window id

int width;

int height;

GLuint tex_id;

int buf_size;

GLubyte *buf;

void draw() {

const XnDepthPixel *data = depthMD.Data();

GLubyte tmp;

for (int i = 0; i < width*height; i++) {

tmp = (10000 - data[i]) >> 3;

buf[i*3] = tmp;

buf[i*3+1] = tmp;

buf[i*3+2] = tmp;

}

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, buf);

glBindTexture(GL_TEXTURE_2D, tex_id);

glColor4f(1.0, 1.0, 1.0, 1.0);

glBegin(GL_QUADS);

glTexCoord2f(0.0f, 0.0f); glVertex2i(0, 0);

glTexCoord2f(1.0f, 0.0f); glVertex2i(width, 0);

glTexCoord2f(1.0f, 1.0f); glVertex2i(width, height);

glTexCoord2f(0.0f, 1.0f); glVertex2i(0, height);

glEnd();

glutSwapBuffers();

}

void init_tex() {

// Create Texture

glGenTextures(1, &tex_id);

glBindTexture(GL_TEXTURE_2D, tex_id);

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);

}

void reshape_window(int w, int h) {

glutReshapeWindow(width, height);

}

void key_pressed(unsigned char key, int x, int y) {

if (key == 27)

glutDestroyWindow(window);

}

void init_window(int argc, char **argv, int w, int h, void main_loop(void)) {

width = w;

height = h;

buf_size = 3*width*height*sizeof(GLubyte);

buf = (GLubyte*)malloc(buf_size);

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH);

glutInitWindowSize(width, height);

glutInitWindowPosition(0, 0);

window = glutCreateWindow("OSCeleton");

glutDisplayFunc(main_loop);

glutIdleFunc(main_loop);

glutReshapeFunc(reshape_window);

glutKeyboardFunc(key_pressed);

gluOrtho2D(0.0, width, height, 0.0);

glEnable(GL_TEXTURE_2D);

glEnable(GL_BLEND);

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

init_tex();

}