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https://github.com/eddyem/eddys_snippets.git
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add GLUT_window ex
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353
GLUT_window/imageview.c
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353
GLUT_window/imageview.c
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// bmpview.c
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//
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// Copyright 2010 Edward V. Emelianoff <eddy@sao.ru>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301, USA.
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//-lglut
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#include <X11/Xlib.h> // XInitThreads();
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//#include <GL/glew.h>
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#include <GL/glut.h>
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#include <GL/glext.h>
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#include <GL/freeglut.h>
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#include <math.h> // roundf(), log(), sqrt()
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#include <pthread.h>
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#include <usefull_macros.h>
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#include "imageview.h"
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static windowData *win = NULL; // main window
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static pthread_t GLUTthread; // main GLUT thread
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static int initialized = 0; // ==1 if GLUT is initialized; ==0 after clear_GL_context
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static void createWindow();
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static void RedrawWindow();
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static void *Redraw(_U_ void *arg);
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static void Resize(int width, int height);
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/**
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* calculate window properties on creating & resizing
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*/
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void calc_win_props(GLfloat *Wortho, GLfloat *Hortho){
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if(!win || ! win->image) return;
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float a, A, w, h, W, H;
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float Zoom = win->zoom;
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w = (float)win->image->w / 2.f;
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h = (float)win->image->h / 2.f;
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W = (float)win->w;
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H =(float) win->h;
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A = W / H;
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a = w / h;
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if(A > a){ // now W & H are parameters for glOrtho
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win->Daspect = (float)h / H * 2.f;
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W = h * A; H = h;
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}else{
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win->Daspect = (float)w / W * 2.f;
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H = w / A; W = w;
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}
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if(Wortho) *Wortho = W;
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if(Hortho) *Hortho = H;
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// calculate coordinates of center
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win->x0 = W/Zoom - w + win->x / Zoom;
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win->y0 = H/Zoom + h - win->y / Zoom;
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}
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/**
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* create window & run main loop
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*/
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static void createWindow(){
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FNAME();
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DBG("ini=%d, win %s", initialized, win ? "yes" : "no");
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if(!initialized) return;
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if(!win) return;
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int w = win->w, h = win->h;
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DBG("create window with title %s", win->title);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
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glutInitWindowSize(w, h);
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win->ID = glutCreateWindow(win->title);
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//glewInit();
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DBG("created GL_ID=%d", win->ID);
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glGenTextures(1, &(win->Tex));
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calc_win_props(NULL, NULL);
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win->zoom = 1. / win->Daspect;
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glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, win->Tex);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, win->image->w, win->image->h, 0,
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GL_RGB, GL_UNSIGNED_BYTE, win->image->rawdata);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
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// glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
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glDisable(GL_TEXTURE_2D);
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createMenu();
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DBG("Window opened");
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glutReshapeFunc(Resize);
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glutDisplayFunc(RedrawWindow);
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glutKeyboardFunc(keyPressed);
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//glutSpecialFunc(keySpPressed);
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//glutMouseWheelFunc(mouseWheel);
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glutMouseFunc(mousePressed);
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glutMotionFunc(mouseMove);
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//glutIdleFunc(glutPostRedisplay);
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glutIdleFunc(RedrawWindow);
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//pthread_create(&GLUTthread, NULL, &Redraw, NULL);
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}
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int killwindow(){
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FNAME();
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if(!win) return 0;
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if(!win->killthread){
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// say changed thread to die
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win->killthread = 1;
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}
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pthread_mutex_lock(&win->mutex);
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//glutSetWindow(win->ID); // obviously set window (for closing from menu)
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DBG("wait for changed thread");
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pthread_join(win->thread, NULL); // wait while thread dies
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if(win->menu) glutDestroyMenu(win->menu);
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glutDestroyWindow(win->ID);
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DBG("destroy menu, wundow & texture %d", win->Tex);
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glDeleteTextures(1, &(win->Tex));
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//glFinish();
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windowData *old = win;
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win->ID = 0;
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win = NULL;
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DBG("free(rawdata)");
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FREE(old->image->rawdata);
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DBG("free(image)");
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FREE(old->image);
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pthread_mutex_unlock(&old->mutex);
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DBG("free(win)");
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FREE(old);
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DBG("return");
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return 1;
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}
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void renderBitmapString(float x, float y, void *font, char *string, GLubyte *color){
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if(!initialized) return;
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char *c;
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int x1=x, W=0;
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for(c = string; *c; c++){
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W += glutBitmapWidth(font,*c);// + 1;
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}
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x1 -= W/2;
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glColor3ubv(color);
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glLoadIdentity();
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glTranslatef(0.,0., -150);
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//glTranslatef(x,y, -4000.);
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for (c = string; *c != '\0'; c++){
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glColor3ubv(color);
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glRasterPos2f(x1,y);
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glutBitmapCharacter(font, *c);
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//glutStrokeCharacter(GLUT_STROKE_ROMAN, *c);
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x1 = x1 + glutBitmapWidth(font,*c);// + 1;
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}
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}
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static void RedrawWindow(){
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if(!initialized || !win) return;
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if(pthread_mutex_trylock(&win->mutex) != 0) return;
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GLfloat w = win->image->w, h = win->image->h;
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glClearColor(0.0, 0.0, 0.5, 1.0);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glLoadIdentity();
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glTranslatef(win->x, win->y, 0.);
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glScalef(-win->zoom, -win->zoom, 1.);
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glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, win->Tex);
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if(win->image->changed){
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DBG("Changed");
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, win->image->w, win->image->h,
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GL_RGB, GL_UNSIGNED_BYTE, win->image->rawdata);
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win->image->changed = 0;
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}
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w /= 2.f; h /= 2.f;
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float lr = 1., ud = 1.; // flipping coefficients
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if(win->flip & WIN_FLIP_LR) lr = -1.;
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if(win->flip & WIN_FLIP_UD) ud = -1.;
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glBegin(GL_QUADS);
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glTexCoord2f(1.0f, 1.0f); glVertex2f( -1.f*lr*w, ud*h ); // top right
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glTexCoord2f(1.0f, 0.0f); glVertex2f( -1.f*lr*w, -1.f*ud*h ); // bottom right
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glTexCoord2f(0.0f, 0.0f); glVertex2f(lr*w, -1.f*ud*h ); // bottom left
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glTexCoord2f(0.0f, 1.0f); glVertex2f(lr*w, ud*h ); // top left
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glEnd();
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glDisable(GL_TEXTURE_2D);
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glFinish();
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glutSwapBuffers();
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pthread_mutex_unlock(&win->mutex);
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usleep(10000);
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}
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/**
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* main freeGLUT loop
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* waits for global signals to create windows & make other actions
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*/
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static void *Redraw(_U_ void *arg){
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FNAME();
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createWindow();
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glutMainLoop();
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/* while(1){
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if(!initialized){
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DBG("!initialized -> exit thread");
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return NULL;
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}
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if(!win || win->killthread){
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DBG("Thread killed");
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return NULL;
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}
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if(win && win->ID > 0){
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//glutSetWindow(win->ID);
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glutPostRedisplay();
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//RedrawWindow();
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glutMainLoopEvent();
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usleep(10000);
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}
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}*/
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return NULL;
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}
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static void Resize(int width, int height){
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if(!initialized) return;
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//int window = glutGetWindow();
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if(!win/* || !window*/) return;
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glutReshapeWindow(width, height);
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win->w = width;
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win->h = height;
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glViewport(0, 0, width, height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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GLfloat W, H;
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calc_win_props(&W, &H);
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glOrtho(-W,W, -H,H, -1., 1.);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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/**
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* create new window, run thread & return pointer to its structure or NULL
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* asynchroneous call from outside
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* wait for window creating & return its data
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* @param title - header (copyed inside this function)
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* @param w,h - image size
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* @param rawdata - NULL (then the memory will be allocated here with size w x h)
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* or allocated outside data
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*/
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windowData *createGLwin(char *title, int w, int h, rawimage *rawdata){
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FNAME();
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if(!initialized) return NULL;
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if(win) killwindow();
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win = MALLOC(windowData, 1);
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rawimage *raw;
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if(rawdata){
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raw = rawdata;
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}else{
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raw = MALLOC(rawimage, 1);
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if(raw){
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raw->rawdata = MALLOC(GLubyte, w*h*3);
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raw->w = w;
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raw->h = h;
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raw->changed = 1;
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// raw->protected is zero automatically
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}
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}
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if(!raw || !raw->rawdata){
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free(raw);
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return NULL;
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}
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win->title = strdup(title);
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win->image = raw;
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if(pthread_mutex_init(&win->mutex, NULL)){
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WARN(_("Can't init mutex!"));
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killwindow();
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return NULL;
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}
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win->w = w;
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win->h = h;
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pthread_create(&GLUTthread, NULL, &Redraw, NULL);
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return win;
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}
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/**
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* Init freeGLUT
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*/
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void imageview_init(){
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FNAME();
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char *v[] = {"Sample window", NULL};
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int c = 1;
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static int glutnotinited = 1;
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if(initialized){
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WARNX(_("Already initialized!"));
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return;
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}
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if(glutnotinited){
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DBG("init");
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// XInitThreads(); // we need it for threaded windows
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glutInit(&c, v);
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glutnotinited = 0;
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}
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glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION);
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initialized = 1;
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}
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/**
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* Close all opened windows and terminate main GLUT thread
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*/
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void clear_GL_context(){
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FNAME();
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if(!initialized) return;
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initialized = 0;
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glutLeaveMainLoop();
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DBG("kill");
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killwindow();
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DBG("join");
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pthread_join(GLUTthread, NULL); // wait while main thread exits
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DBG("main GL thread cancelled");
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}
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/*
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* Coordinates transformation from CS of drawingArea into CS of picture
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* x,y - pointer coordinates
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* X,Y - coordinates of appropriate point at picture
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*/
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void conv_mouse_to_image_coords(int x, int y,
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float *X, float *Y,
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windowData *window){
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float a = window->Daspect / window->zoom;
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*X = (float)x * a - window->x0;
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*Y = window->y0 - (float)y * a;
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}
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void conv_image_to_mouse_coords(float X, float Y,
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int *x, int *y,
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windowData *window){
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float a = window->zoom / window->Daspect;
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*x = (int)roundf((X + window->x0) * a);
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*y = (int)roundf((window->y0 - Y) * a);
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}
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windowData *getWin(){
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return win;
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}
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