/*
** - get a DC if one doesn't exist
** - create an HGLRC if one doesn't exist
*/
static qbool GLW_InitDriver( int colorbits )
{
int tpfd;
int depthbits, stencilbits;
static PIXELFORMATDESCRIPTOR pfd; // save between frames since 'tr' gets cleared
ri.Printf( PRINT_DEVELOPER, "Initializing OpenGL driver\n" );
//
// get a DC for our window if we don't already have one allocated
//
if ( glw_state.hDC == NULL )
{
if ( ( glw_state.hDC = GetDC( g_wv.hWnd ) ) == NULL )
{
ri.Printf( PRINT_ALL, "...Get DC failed\n" );
return qfalse;
}
ri.Printf( PRINT_DEVELOPER, "...Get DC succeeded\n" );
}
if ( colorbits == 0 )
{
colorbits = glw_state.desktopBPP;
}
//
// implicitly assume Z-buffer depth == desktop color depth
//
if ( r_depthbits->integer == 0 ) {
if ( colorbits > 16 ) {
depthbits = 24;
} else {
depthbits = 16;
}
} else {
depthbits = r_depthbits->integer;
}
//
// do not allow stencil if Z-buffer depth likely won't contain it
//
stencilbits = r_stencilbits->integer;
if ( depthbits < 24 )
{
stencilbits = 0;
}
//
// make two attempts to set the PIXELFORMAT
//
//
// first attempt: r_colorbits, depthbits, and r_stencilbits
//
if ( !glw_state.pixelFormatSet )
{
GLW_CreatePFD( &pfd, colorbits, depthbits, stencilbits, (qbool)r_stereo->integer );
if ( ( tpfd = GLW_MakeContext( &pfd ) ) != TRY_PFD_SUCCESS )
{
if ( tpfd == TRY_PFD_FAIL_HARD )
{
ri.Printf( PRINT_WARNING, "...failed hard\n" );
return qfalse;
}
//
// punt if we've already tried the desktop bit depth and no stencil bits
//
if ( ( r_colorbits->integer == glw_state.desktopBPP ) && !stencilbits )
{
ReleaseDC( g_wv.hWnd, glw_state.hDC );
glw_state.hDC = NULL;
ri.Printf( PRINT_ALL, "...failed to find an appropriate PIXELFORMAT\n" );
return qfalse;
}
//
// second attempt: desktop's color bits and no stencil
//
if ( colorbits > glw_state.desktopBPP )
colorbits = glw_state.desktopBPP;
GLW_CreatePFD( &pfd, colorbits, depthbits, 0, (qbool)r_stereo->integer );
if ( GLW_MakeContext( &pfd ) != TRY_PFD_SUCCESS )
{
if ( glw_state.hDC )
{
ReleaseDC( g_wv.hWnd, glw_state.hDC );
glw_state.hDC = NULL;
}
ri.Printf( PRINT_ALL, "...failed to find an appropriate PIXELFORMAT\n" );
return qfalse;
}
}
// report if stereo is desired but unavailable
//
if ( r_stereo->integer && !( pfd.dwFlags & PFD_STEREO ) )
{
ri.Printf( PRINT_ALL, "...failed to select stereo pixel format\n" );
glConfig.stereoEnabled = qfalse;
}
}
// store PFD specifics
//
glConfig.colorBits = ( int ) pfd.cColorBits;
glConfig.depthBits = ( int ) pfd.cDepthBits;
glConfig.stencilBits = ( int ) pfd.cStencilBits;
return qtrue;
}
// - get a DC if one doesn't exist
// - create an HGLRC if one doesn't exist
static bool GLW_InitDriver( int colorbits ) {
static PIXELFORMATDESCRIPTOR pfd; // save between frames since 'tr' gets cleared
common->Printf( "Initializing OpenGL driver\n" );
//
// get a DC for our window if we don't already have one allocated
//
if ( maindc == NULL ) {
common->Printf( "...getting DC: " );
if ( ( maindc = GetDC( GMainWindow ) ) == NULL ) {
common->Printf( "failed\n" );
return false;
}
common->Printf( "succeeded\n" );
}
if ( colorbits == 0 ) {
colorbits = desktopBitsPixel;
}
//
// implicitly assume Z-buffer depth == desktop color depth
//
int depthbits;
if ( r_depthbits->integer == 0 ) {
if ( colorbits > 16 ) {
depthbits = 24;
} else {
depthbits = 16;
}
} else {
depthbits = r_depthbits->integer;
}
//
// do not allow stencil if Z-buffer depth likely won't contain it
//
int stencilbits = r_stencilbits->integer;
if ( depthbits < 24 ) {
stencilbits = 0;
}
//
// make two attempts to set the PIXELFORMAT
//
//
// first attempt: r_colorbits, depthbits, and r_stencilbits
//
if ( !pixelFormatSet ) {
GLW_CreatePFD( &pfd, colorbits, depthbits, stencilbits, !!r_stereo->integer );
int tpfd = GLW_MakeContext( &pfd );
if ( tpfd != TRY_PFD_SUCCESS ) {
if ( tpfd == TRY_PFD_FAIL_HARD ) {
if ( maindc ) {
ReleaseDC( GMainWindow, maindc );
maindc = NULL;
}
common->Printf( S_COLOR_YELLOW "...failed hard\n" );
return false;
}
//
// punt if we've already tried the desktop bit depth and no stencil bits
//
if ( ( r_colorbits->integer == desktopBitsPixel ) && ( stencilbits == 0 ) ) {
if ( maindc ) {
ReleaseDC( GMainWindow, maindc );
maindc = NULL;
}
common->Printf( "...failed to find an appropriate PIXELFORMAT\n" );
return false;
}
//
// second attempt: desktop's color bits and no stencil
//
if ( colorbits > desktopBitsPixel ) {
colorbits = desktopBitsPixel;
}
GLW_CreatePFD( &pfd, colorbits, depthbits, 0, !!r_stereo->integer );
if ( GLW_MakeContext( &pfd ) != TRY_PFD_SUCCESS ) {
if ( maindc ) {
ReleaseDC( GMainWindow, maindc );
maindc = NULL;
}
common->Printf( "...failed to find an appropriate PIXELFORMAT\n" );
return false;
}
}
//
// Report if stereo is desired but unavailable.
//
if ( !( pfd.dwFlags & PFD_STEREO ) && ( r_stereo->integer != 0 ) ) {
common->Printf( "...failed to select stereo pixel format\n" );
glConfig.stereoEnabled = false;
}
}
//
// Store PFD specifics.
//
glConfig.colorBits = ( int )pfd.cColorBits;
glConfig.depthBits = ( int )pfd.cDepthBits;
glConfig.stencilBits = ( int )pfd.cStencilBits;
return true;
}