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/*
Copyright (C) 1997-2001 Id Software, Inc.
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
RW_IMP.C
This file contains ALL Win32 specific stuff having to do with the
software refresh. When a port is being made the following functions
must be implemented by the port:
SWimp_EndFrame
SWimp_Init
SWimp_SetPalette
SWimp_Shutdown
*/
#include "client.h"
typedef struct {
HDC dibdc; // DC compatible with DIB section
HBITMAP dibsect; // DIB section
byte *pixels; // DIB base pointer, NOT used directly for rendering!
HGDIOBJ prevobj;
} sww_t;
static sww_t sww;
/*
SWimp_Shutdown
System specific graphics subsystem shutdown routine.
Destroys DIB surfaces as appropriate.
*/
void VID_Shutdown(void)
{
if (sww.dibdc) {
SelectObject(sww.dibdc, sww.prevobj);
DeleteDC(sww.dibdc);
}
if (sww.dibsect) {
DeleteObject(sww.dibsect);
}
memset(&sww, 0, sizeof(sww));
Win_Shutdown();
}
void SWimp_ModeChanged(void)
{
BITMAPINFO info;
if (!sww.dibdc) {
return;
}
// destroy previous DIB section
if (sww.dibsect) {
SelectObject(sww.dibdc, sww.prevobj);
DeleteObject(sww.dibsect);
}
// fill in the BITMAPINFO struct
memset(&info, 0, sizeof(info));
info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
info.bmiHeader.biWidth = win.rc.width;
info.bmiHeader.biHeight = win.rc.height;
info.bmiHeader.biPlanes = 1;
info.bmiHeader.biCompression = BI_RGB;
info.bmiHeader.biBitCount = 32;
// create the DIB section
sww.dibsect = CreateDIBSection(win.dc,
&info,
DIB_RGB_COLORS,
(void **)&sww.pixels,
NULL,
0);
if (!sww.dibsect) {
Com_Error(ERR_FATAL, "DIB_Init: CreateDIBSection failed");
}
if (info.bmiHeader.biHeight > 0) {
// bottom up
win.buffer = sww.pixels + (win.rc.height - 1) * win.rc.width * 4;
win.pitch = -win.rc.width * 4;
} else {
// top down
win.buffer = sww.pixels;
win.pitch = win.rc.width * 4;
}
// clear the DIB memory buffer
memset(sww.pixels, 0, win.rc.width * win.rc.height * 4);
sww.prevobj = SelectObject(sww.dibdc, sww.dibsect);
if (!sww.prevobj) {
Com_Error(ERR_FATAL, "DIB_Init: SelectObject failed\n");
}
}
/*
SWimp_Init
This routine is responsible for initializing the implementation
specific stuff in a software rendering subsystem.
*/
qboolean VID_Init(void)
{
// create the window
Win_Init();
// set display mode
Win_SetMode();
// create logical DC
sww.dibdc = CreateCompatibleDC(win.dc);
if (!sww.dibdc) {
Com_EPrintf("DIB_Init: CreateCompatibleDC failed with error %lu\n", GetLastError());
Win_Shutdown();
return qfalse;
}
// call SWimp_ModeChanged and friends
Win_ModeChanged();
return qtrue;
}
void VID_VideoWait(void)
{
}
qboolean VID_VideoSync(void)
{
return qtrue;
}
void VID_BeginFrame(void)
{
}
/*
SWimp_EndFrame
This does an implementation specific copy from the backbuffer to the
front buffer. In the Win32 case it uses BitBlt if we're using DIB sections/GDI.
*/
void VID_EndFrame(void)
{
BitBlt(win.dc, 0, 0, win.rc.width, win.rc.height, sww.dibdc, 0, 0, SRCCOPY);
}
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