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Removed offscreen demo program.

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git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@479 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
rkrolib 2004-03-15 06:08:08 +00:00
parent d566de6bc8
commit 68abc58465
4 changed files with 21 additions and 200 deletions
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2
.gitattributes vendored
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@ -53,8 +53,6 @@ freeglut/freeglut/progs/demos/One/Makefile.am svn_keywords=Author+Date+Id+Revisi
freeglut/freeglut/progs/demos/One/one.c svn_keywords=Author+Date+Id+Revision
freeglut/freeglut/progs/demos/One/one.dsp svn_keywords=Author+Date+Id+Revision
freeglut/freeglut/progs/demos/demos.dsw svn_keywords=Author+Date+Id+Revision
freeglut/freeglut/progs/demos/offscreen/Makefile.am svn_keywords=Author+Date+Id+Revision
freeglut/freeglut/progs/demos/offscreen/offscreen.c svn_keywords=Author+Date+Id+Revision
freeglut/freeglut/progs/demos/shapes/Makefile.am svn_keywords=Author+Date+Id+Revision
freeglut/freeglut/progs/demos/shapes/shapes.c svn_keywords=Author+Date+Id+Revision
freeglut/freeglut/progs/demos/shapes/shapes.dsp svn_keywords=Author+Date+Id+Revision

5
freeglut/freeglut/progs/demos/offscreen/Makefile.am
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@ -1,5 +0,0 @@
EXTRA_DIST = unmanaged.c unmanaged.dsp
noinst_PROGRAMS = offscreen
offscreen_SOURCES = offscreen.c
offscreen_LDFLAGS = -export-dynamic ../../../src/lib@LIBRARY@.la
offscreen_CFLAGS = -I$(top_srcdir)/include $(X_CFLAGS)

172
freeglut/freeglut/progs/demos/offscreen/offscreen.c
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@ -1,172 +0,0 @@
/*
* freeglut offscreen rendering demo.
*
* Usage:
*
* offscreen [standard GLUT options] [filename]
*
* The filename is used to say where to write a PNM image file
* that is the sole way to verify that this program is doing what
* it should (i.e., rendering offscreen).
*
* You can view the PNM file in image viewers and editors such as
* the GIMP. (Everyone doing any kind of graphics has at least one
* multi-format-reading image manipulation program, right?)
*
* If no filename is specified, the chosen filename is "offscreen.pnm".
*
* Some suggested uses for GLUT_OFFSCREEN:
*
* * Implementation of a graphics language that writes bitmapped image files.
* * Capture GLUT bitmapped fonts to a texture at runtime to make scalable
* bitmapped fonts.
* * Using OpenGL to create special-effect textures at run-time.
* * Making stencils.
* * Getting the depth-buffer for a height-field.
* * Using OpenGL to create a poster texture (e.g., for pasting onto a a
* video screen in a virtual world).
* * Using OpenGL to prescale an image to a power-of-2 dimension (including
* OpenGL antialiasing). There's no reason that you couldn't do this
* yourself, but OpenGL can do it for you, so why not?
* * Rendering to a bitmap larger than the display has been suggested
* as well. This is a cheap way to produce arbitrarily high resolution
* images for printing.
*
* In every case, there are at least cases where you would want to do this
* without actually rendering to a visible window.
*
*/
#include <stdio.h>
#include <GL/freeglut.h>
#define OFFSCREEN_W 500
#define OFFSCREEN_H 250
int offscreen_id;
int onscreen_id;
const char *save_file_name = "offscreen.pnm";
void cb_onscreen_display( void )
{
glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
glColor3d( 1.0, 0.0, 0.0 );
glBegin( GL_LINE_LOOP );
glVertex2d( 0.0, 0.0 );
glVertex2d( 0.5, 0.0 );
glVertex2d( 0.5, 0.5 );
glVertex2d( 0.0, 0.5 );
glVertex2d( 0.0, 0.0 );
glEnd( );
glColor3d( 1.0, 1.0, 1.0 );
glRasterPos2d( -1.0, 0.8 );
glutBitmapString(
GLUT_BITMAP_TIMES_ROMAN_24, "Press `s' or `S' to Send to"
);
glRasterPos2d( -.8, 0.6 );
glutBitmapString(
GLUT_BITMAP_TIMES_ROMAN_24, "'offscreen.pnm'"
);
glRasterPos2d( -1.0, 0.3 );
glutBitmapString(
GLUT_BITMAP_TIMES_ROMAN_24, "Press `q', `Q', or Esc to quit."
);
glutSwapBuffers( );
}
void write_raw_pnm( char *fname, char *pixels, int w, int h)
{
FILE *f;
printf( "Trying to create: %s\n", fname );
f = fopen( fname, "wb" );
if( !f )
printf( "Ouch! Cannot create file.\n" );
else
{
int row;
printf( "Opened file.\n" );
fprintf( f, "P6\n" );
fprintf( f, "# CREATOR: offscreen freeglut demo\n" );
fprintf( f, "%d %d\n", w, h );
fprintf( f, "255\n" );
/*
* Write the rows in reverse order because OpenGL's 0th row
* is at the bottom.
*/
for( row = h; row; --row )
fwrite( pixels + ((row - 1)*w*3), 1, 3 * w, f );
fclose( f );
}
}
void cb_offscreen_display( void )
{
static char pixels [OFFSCREEN_W * OFFSCREEN_H * 3];
int i;
cb_onscreen_display( );
glColor3d( 0.0, 1.0, 0.0 );
glBegin( GL_LINES );
for( i = 0; i < 100; ++i)
{
glVertex2d( +1 - (i/50.0), +1 );
glVertex2d( -1 + (i/50.0), -1 );
}
glEnd( );
glFinish( );
glPixelStorei( GL_PACK_ALIGNMENT, 1 );
glReadPixels(
0, 0, OFFSCREEN_W, OFFSCREEN_H,
GL_RGB, GL_UNSIGNED_BYTE, (GLvoid *)pixels
);
write_raw_pnm( save_file_name, pixels, OFFSCREEN_W, OFFSCREEN_H );
}
void cb_onscreen_keyboard( unsigned char key, int x, int y )
{
switch( key )
{
case 's':
case 'S':
glutSetWindow( offscreen_id );
glutPostRedisplay( );
break;
case '\x1b':
case 'q':
case 'Q':
exit( 0 );
break;
default:
break;
}
}
int main( int argc, char **argv )
{
glutInit( &argc, argv );
if( argv[ 1 ] )
save_file_name = argv[ 1 ];
glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
onscreen_id = glutCreateWindow( "Offscreen demo" );
glutDisplayFunc( cb_onscreen_display );
glutKeyboardFunc( cb_onscreen_keyboard );
glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_OFFSCREEN );
glutInitWindowSize( OFFSCREEN_W, OFFSCREEN_H );
offscreen_id = glutCreateWindow( "" );
glutDisplayFunc( cb_offscreen_display );
glutMainLoop( );
}