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#ifdef WIN32
#include <windows.h> /* necessary because of the Microsoft OpenGL headers dependency */
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <iup.h>
#include <iupgl.h>
#include <im.h>
#include <im_image.h>
#include <im_util.h>
#include <im_convert.h>
int app_repaint_cb(Ihandle* self)
{
unsigned char* gl_data = (unsigned char*)IupGetAttribute(self, "APP_GL_DATA");
int width = IupGetInt(self, "APP_GL_WIDTH");
int height = IupGetInt(self, "APP_GL_HEIGHT");
IupGLMakeCurrent(self); /* activates this GL Canvas as the current drawing area. */
glClear(GL_COLOR_BUFFER_BIT); /* clears the back buffer */
if (gl_data)
{
/* Draws the captured image at (0,0) */
glRasterPos2f(0.f, 0.f);
glDrawPixels(width, height, GL_RGB, GL_UNSIGNED_BYTE, gl_data);
}
IupGLSwapBuffers(self); /* swap data from back buffer to front buffer */
return IUP_DEFAULT;
}
void appGLInit(int width, int height)
{
glClearColor(0., 0., 0., 1.0); /* window background */
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); /* data alignment is 1 */
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D (0.0, (GLdouble)width, 0.0, (GLdouble)height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int app_resize_cb(Ihandle* self, int width, int height)
{
IupGLMakeCurrent(self);
appGLInit(width, height);
return IUP_DEFAULT;
}
/* OpenGL does not supports palette based images, so convert to RGB */
/* this function can also be use for RGBA images */
void ConvertMapToGLData(unsigned char* data, int count, int depth, long* palette, int palette_count)
{
int c, i;
unsigned char r[256], g[256], b[256];
unsigned char* src_data = data + count-1;
unsigned char* dst_data = data + depth*(count-1);
for (c = 0; c < palette_count; c++)
imColorDecode(&r[c], &g[c], &b[c], palette[c]);
for (i = 0; i < count; i++)
{
int index = *src_data;
*dst_data = r[index];
*(dst_data+1) = g[index];
*(dst_data+2) = b[index];
dst_data -= depth;
src_data--;
}
}
int app_open_cb(Ihandle* self)
{
imFile* ifile; /* file input */
int ret, error;
unsigned char* gl_data = (unsigned char*)IupGetAttribute(self, "APP_GL_DATA");
char filename[1024] = ".\\*.*";
/* get a file name */
ret = IupGetFile(filename);
if (ret == -1)
return IUP_DEFAULT;
ifile = imFileOpen(filename, &error);
if (!ifile)
{
IupMessage("Error", "Error reading image file.");
return IUP_DEFAULT;
}
{
int width = 0, height = 0, file_color_mode, color_space;
Ihandle* dialog = IupGetDialog(self);
imFileReadImageInfo(ifile, 0, &width, &height, &file_color_mode, NULL);
/* alocates the buffers */
if (gl_data) free(gl_data);
gl_data = malloc(width*height*3);
IupSetAttribute(dialog, "APP_GL_DATA", gl_data);
IupSetfAttribute(dialog, "APP_GL_WIDTH", "%d", width);
IupSetfAttribute(dialog, "APP_GL_HEIGHT", "%d", height);
imFileReadImageData(ifile, gl_data, 1, IM_PACKED);
color_space = imColorModeSpace(file_color_mode);
if (color_space == IM_MAP || color_space == IM_GRAY || color_space == IM_BINARY)
{
long palette[256];
int palette_count;
imFileGetPalette(ifile, palette, &palette_count);
ConvertMapToGLData(gl_data, width*height, 3, palette, palette_count);
}
}
imFileClose(ifile);
return IUP_DEFAULT;
}
int app_exit_cb(Ihandle *self)
{
unsigned char* gl_data = (unsigned char*)IupGetAttribute(self, "APP_GL_DATA");
/* destroy buffers */
if (gl_data)
free(gl_data);
return IUP_CLOSE;
}
int app_about_cb(Ihandle *self)
{
IupMessagef("About", "IUPGLView 1.0\n"
"Tecgraf/PUC-Rio\n"
" ---------------- \n"
"IUP Version %s\n"
"IM Version %s\n"
" ---------------- \n"
"OpenGL:\n"
" Vendor: %s\n"
" Renderer: %s\n"
" Version: %s\n"
, IUP_RELEASE_VERSION, IM_VERSION,
glGetString(GL_VENDOR),glGetString(GL_RENDERER),glGetString(GL_VERSION));
return IUP_DEFAULT;
}
void mainMenuCreate(void)
{
Ihandle* file_menu = IupMenu(
IupItem( "Open...", "app_open_cb"),
IupSeparator(),
IupItem( "Exit", "app_exit_cb"),
NULL
);
Ihandle* menu = IupMenu(
IupSubmenu("File", file_menu),
NULL
);
/* this will be used by the dialog */
IupSetHandle("app_menu", menu);
IupSetFunction("app_open_cb", (Icallback)app_open_cb);
IupSetFunction("app_exit_cb", (Icallback)app_exit_cb);
}
void mainDialogCreate(void)
{
Ihandle *dialog, *box, *canvas;
/* initialize interface */
/* canvas for the image */
canvas = IupGLCanvas("app_repaint_cb");
IupSetAttribute(canvas, "BORDER", "NO");
IupSetAttribute(canvas, "BUFFER", "DOUBLE"); /* use double buffer */
IupSetAttribute(canvas, "RESIZE_CB", "app_resize_cb"); /* configure the resize callback */
IupSetFunction("app_resize_cb", (Icallback)app_resize_cb);
IupSetFunction("app_repaint_cb", (Icallback)app_repaint_cb);
/* this is the most external box that puts together
the toolbar, the two canvas and the status bar */
box = IupSetAttributes(IupHbox(
canvas,
NULL), "MARGIN=10x10");
/* create the dialog and set its attributes */
mainMenuCreate();
dialog = IupDialog(box);
IupSetAttribute(dialog, "MENU", "app_menu"); /* configure the menu */
IupSetAttribute(dialog, "CLOSE_CB", "app_exit_cb");
IupSetAttribute(dialog, "TITLE", "IUPGLView");
IupSetAttribute(dialog, "RASTERSIZE", "680x380"); /* initial size */
IupSetAttribute(dialog, "SHRINK", "YES");
IupSetHandle("app_dialog", dialog);
IupShowXY(dialog, IUP_CENTER, IUP_CENTER);
}
int main(int argc, char* argv[])
{
/* IUP initialization */
IupOpen();
IupGLCanvasOpen();
/* Create and show the main dialog */
mainDialogCreate();
/* IUP event loop */
IupMainLoop();
/* IUP closing */
IupClose();
return 0;
}
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