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- commit patch from Matthew Plough to request buffer with SWAP_COPY 

behavior
This commit is contained in:
Daniel Dunbar 2005-07-17 20:40:07 +00:00
parent e6e9b1ea80
commit 5bc4eae608
1 changed files with 77 additions and 2 deletions
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79
intern/ghost/intern/GHOST_WindowWin32.cpp
View File

@ -49,6 +49,9 @@ LPCSTR GHOST_WindowWin32::s_windowClassName = "GHOST_WindowClass";
const int GHOST_WindowWin32::s_maxTitleLength = 128;
HGLRC GHOST_WindowWin32::s_firsthGLRc = NULL;
static int WeightPixelFormat(PIXELFORMATDESCRIPTOR& pfd);
static int EnumPixelFormats(HDC hdc);
/*
* Color and depth bit values are not to be trusted.
* For instance, on TNT2:
@ -63,6 +66,7 @@ static PIXELFORMATDESCRIPTOR sPreferredFormat = {
1, /* version */
PFD_SUPPORT_OPENGL |
PFD_DRAW_TO_WINDOW |
PFD_SWAP_COPY | /* support swap copy */
PFD_DOUBLEBUFFER, /* support double-buffering */
PFD_TYPE_RGBA, /* color type */
32, /* prefered color depth */
@ -393,11 +397,11 @@ GHOST_TSuccess GHOST_WindowWin32::installDrawingContext(GHOST_TDrawingContextTyp
switch (type) {
case GHOST_kDrawingContextTypeOpenGL:
{
if(m_stereoVisual)
if(m_stereoVisual)
sPreferredFormat.dwFlags |= PFD_STEREO;
// Attempt to match device context pixel format to the preferred format
int iPixelFormat = ::ChoosePixelFormat(m_hDC, &sPreferredFormat);
int iPixelFormat = EnumPixelFormats(m_hDC);
if (iPixelFormat == 0) {
success = GHOST_kFailure;
break;
@ -630,3 +634,74 @@ GHOST_TSuccess GHOST_WindowWin32::setWindowCustomCursorShape(GHOST_TUns8 *bitmap
return GHOST_kSuccess;
}
/* Ron Fosner's code for weighting pixel formats and forcing software.
See http://www.opengl.org/resources/faq/technical/weight.cpp */
static int WeightPixelFormat(PIXELFORMATDESCRIPTOR& pfd) {
int weight = 0;
/* assume desktop color depth is 32 bits per pixel */
/* cull unusable pixel formats */
/* if no formats can be found, can we determine why it was rejected? */
if( !(pfd.dwFlags & PFD_SUPPORT_OPENGL) ||
!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) ||
!(pfd.dwFlags & PFD_DOUBLEBUFFER) || /* Blender _needs_ this */
( pfd.cDepthBits <= 8 ) ||
!(pfd.iPixelType == PFD_TYPE_RGBA) )
return 0;
weight = 1; /* it's usable */
/* the bigger the depth buffer the better */
/* give no weight to a 16-bit depth buffer, because those are crap */
weight += pfd.cDepthBits - 16;
weight += pfd.cColorBits - 8;
/* want swap copy capability -- it matters a lot */
if(pfd.dwFlags & PFD_SWAP_COPY) weight += 16;
/* but if it's a generic (not accelerated) view, it's really bad */
if(pfd.dwFlags & PFD_GENERIC_FORMAT) weight /= 10;
return weight;
}
/* A modification of Ron Fosner's replacement for ChoosePixelFormat */
/* returns 0 on error, else returns the pixel format number to be used */
static int EnumPixelFormats(HDC hdc) {
int iPixelFormat;
int i, n, w, weight = 0;
PIXELFORMATDESCRIPTOR pfd, pfd_fallback;
/* we need a device context to do anything */
if(!hdc) return 0;
iPixelFormat = 1; /* careful! PFD numbers are 1 based, not zero based */
/* obtain detailed information about
the device context's first pixel format */
n = 1+::DescribePixelFormat(hdc, iPixelFormat,
sizeof(PIXELFORMATDESCRIPTOR), &pfd);
/* choose a pixel format using the useless Windows function in case
we come up empty handed */
iPixelFormat = ::ChoosePixelFormat( hdc, &sPreferredFormat );
if(!iPixelFormat) return 0; /* couldn't find one to use */
for(i=1; i<=n; i++) { /* not the idiom, but it's right */
::DescribePixelFormat( hdc, i, sizeof(PIXELFORMATDESCRIPTOR), &pfd );
w = WeightPixelFormat(pfd);
if(w > weight) {
weight = w;
iPixelFormat = i;
}
}
return iPixelFormat;
}