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/*
* PARSEC - Frame Buffer Functions (OPENGL)
*
* $Author: uberlinuxguy $ - $Date: 2004/09/15 12:25:37 $
*
* Orginally written by:
* Copyright (c) Markus Hadwiger <msh@parsec.org> 1999
* Copyright (c) Clemens Beer <cbx@parsec.org> 1999
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
// C library
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// compilation flags/debug support
#include "config.h"
#include "debug.h"
// general definitions
#include "general.h"
#include "objstruc.h"
// global externals
#include "globals.h"
// subsystem headers
#include "vid_defs.h"
// local module header
#include "vsdl_buffo.h"
// opengl headers
#include "r_gl.h"
// proprietary module headers
#include "con_aux.h"
#include "ro_api.h"
#include "ro_supp.h"
#include "vsdl_ogl.h"
// clear entire rendering buffer ----------------------------------------------
//
void VIDs_ClearRenderBuffer()
{
glClearColor( 0, 0, 0, 0 );
glClearDepth( 0.0 );
//NOTE:
// when clearing the depth buffer, write access has
// to be enabled which is disabled on function entry.
// interestingly enough, on TNT drivers this doesn't
// matter, since the mask is completely ignored by
// the driver when clearing the buffer. however, this
// is not the case on a Rage128, for instance.
if ( !AUX_DISABLE_BUFFER_CLEAR && !AUX_DISABLE_ZBUFFER_CLEAR ) {
// simultaneously clear color and depth buffers
RO_DepthMask( GL_TRUE );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
RO_DepthMask( GL_FALSE );
} else if ( !AUX_DISABLE_BUFFER_CLEAR ) {
// clear color buffer only
glClear( GL_COLOR_BUFFER_BIT );
} else if ( !AUX_DISABLE_ZBUFFER_CLEAR ) {
// clear depth buffer only
RO_DepthMask( GL_TRUE );
glClear( GL_DEPTH_BUFFER_BIT );
RO_DepthMask( GL_FALSE );
}
}
// commit render buffer (make backbuffer visible) -----------------------------
//
void VIDs_CommitRenderBuffer()
{
// swap buffers
VSDL_CommitOGLBuff();
}
// create/deinitialize screenshot buffer --------------------------------------
//
char *VIDs_ScreenshotBuffer( int create, int *size )
{
//NOTE:
// this function must be called twice in order to
// make a screenshot.
// first, to get a pointer to the screenshot buffer
// and its size (create==TRUE). like:
// shotbuff = VIDs_ScreenshotBuffer( TRUE, &bufsiz );
// second, to deallocate the buffer (create==FALSE).
// like: VIDs_ScreenshotBuffer( FALSE, NULL );
// temporary screenshot buffer
static char *buffer = NULL;
// validate parameters with respect to buffer allocation
ASSERT( ( create && ( buffer == NULL ) && ( size != NULL ) ) ||
( !create && ( buffer != NULL ) && ( size == NULL ) ) );
if ( create ) {
// alloc screenshot buffer
*size = Screen_Width * Screen_Height * 3;
buffer = (char *) ALLOCMEM( *size );
if ( buffer == NULL ) {
return NULL;
}
// alloc temp readpixels buffer
char *readbuffer = NULL;
readbuffer = (char *) ALLOCMEM( *size );
if ( readbuffer == NULL ) {
return NULL;
}
// assert that screenwidth is even
ASSERT( ( Screen_Width & 0x01 ) == 0 );
// read from back buffer
glReadBuffer( GL_BACK );
// read RGB data from the backbuffer
glReadPixels( 0, 0, Screen_Width, Screen_Height, GL_RGB, GL_UNSIGNED_BYTE, readbuffer );
size_t scanlinelen = (Screen_Width * 3);
char *readpo = readbuffer + ((Screen_Height-1) * scanlinelen);
char *writepo = buffer;
// flip the image upside down
for ( int i = 0; i < Screen_Height; i++ ) {
memcpy( writepo, readpo, scanlinelen );
writepo += scanlinelen;
readpo -= scanlinelen;
}
FREEMEM( readbuffer );
} else if ( buffer != NULL ) {
// free screenshot buffer
FREEMEM( buffer );
buffer = NULL;
}
return buffer;
}
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