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/* Copyright (c) Nate Robins, 1997. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
#include <stdio.h>
#include "glutint.h"
#include "win32_glx.h"
/* global current HDC */
extern HDC XHDC;
GLXContext
glXCreateContext(Display * display, XVisualInfo * visinfo,
GLXContext share, Bool direct)
{
/* KLUDGE: GLX really expects a display pointer to be passed
in as the first parameter, but Win32 needs an HDC instead,
so BE SURE that the global XHDC is set before calling this
routine. */
HGLRC context;
context = CreateContext(XHDC);
#if 0
/* XXX GLUT doesn't support it now, so don't worry about display list
and texture object sharing. */
if (share) {
wglShareLists(share, context);
}
#endif
/* Since direct rendering is implicit, the direct flag is
ignored. */
return context;
}
int
glXGetConfig(Display * display, XVisualInfo * visual, int attrib, int *value)
{
if (!visual)
return GLX_BAD_VISUAL;
switch (attrib) {
case GLX_USE_GL:
if (visual->dwFlags & (PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW)) {
/* XXX Brad's Matrix Millenium II has problems creating
color index windows in 24-bit mode (lead to GDI crash)
and 32-bit mode (lead to black window). The cColorBits
filed of the PIXELFORMATDESCRIPTOR returned claims to
have 24 and 32 bits respectively of color indices. 2^24
and 2^32 are ridiculously huge writable colormaps.
Assume that if we get back a color index
PIXELFORMATDESCRIPTOR with 24 or more bits, the
PIXELFORMATDESCRIPTOR doesn't really work and skip it.
-mjk */
if (visual->iPixelType == PFD_TYPE_COLORINDEX
&& visual->cColorBits >= 24) {
*value = 0;
} else {
*value = 1;
}
} else {
*value = 0;
}
break;
case GLX_BUFFER_SIZE:
/* KLUDGE: if we're RGBA, return the number of bits/pixel,
otherwise, return 8 (we guessed at 256 colors in CI
mode). */
if (visual->iPixelType == PFD_TYPE_RGBA)
*value = visual->cColorBits;
else
*value = 8;
break;
case GLX_LEVEL:
/* The bReserved flag of the pfd contains the
overlay/underlay info. */
*value = visual->bReserved;
break;
case GLX_RGBA:
*value = visual->iPixelType == PFD_TYPE_RGBA;
break;
case GLX_DOUBLEBUFFER:
*value = visual->dwFlags & PFD_DOUBLEBUFFER;
break;
case GLX_STEREO:
*value = visual->dwFlags & PFD_STEREO;
break;
case GLX_AUX_BUFFERS:
*value = visual->cAuxBuffers;
break;
case GLX_RED_SIZE:
*value = visual->cRedBits;
break;
case GLX_GREEN_SIZE:
*value = visual->cGreenBits;
break;
case GLX_BLUE_SIZE:
*value = visual->cBlueBits;
break;
case GLX_ALPHA_SIZE:
*value = visual->cAlphaBits;
break;
case GLX_DEPTH_SIZE:
*value = visual->cDepthBits;
break;
case GLX_STENCIL_SIZE:
*value = visual->cStencilBits;
break;
case GLX_ACCUM_RED_SIZE:
*value = visual->cAccumRedBits;
break;
case GLX_ACCUM_GREEN_SIZE:
*value = visual->cAccumGreenBits;
break;
case GLX_ACCUM_BLUE_SIZE:
*value = visual->cAccumBlueBits;
break;
case GLX_ACCUM_ALPHA_SIZE:
*value = visual->cAccumAlphaBits;
break;
default:
return GLX_BAD_ATTRIB;
}
return 0;
}
XVisualInfo *
glXChooseVisual(Display * display, int screen, int *attribList)
{
/* KLUDGE: since we need the HDC, MAKE SURE to set XHDC
before calling this routine. */
int *p = attribList;
int pf;
PIXELFORMATDESCRIPTOR pfd;
PIXELFORMATDESCRIPTOR *match = NULL;
int stereo = 0;
/* Avoid seg-faults. */
if (!p)
return NULL;
memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize = (sizeof(PIXELFORMATDESCRIPTOR));
pfd.nVersion = 1;
/* Defaults. */
pfd.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
pfd.iPixelType = PFD_TYPE_COLORINDEX;
pfd.cColorBits = 32;
pfd.cDepthBits = 0;
while (*p) {
switch (*p) {
case GLX_USE_GL:
pfd.dwFlags |= PFD_SUPPORT_OPENGL;
break;
case GLX_BUFFER_SIZE:
pfd.cColorBits = *(++p);
break;
case GLX_LEVEL:
/* the bReserved flag of the pfd contains the
overlay/underlay info. */
pfd.bReserved = *(++p);
break;
case GLX_RGBA:
pfd.iPixelType = PFD_TYPE_RGBA;
break;
case GLX_DOUBLEBUFFER:
pfd.dwFlags |= PFD_DOUBLEBUFFER;
break;
case GLX_STEREO:
stereo = 1;
pfd.dwFlags |= PFD_STEREO;
break;
case GLX_AUX_BUFFERS:
pfd.cAuxBuffers = *(++p);
break;
case GLX_RED_SIZE:
pfd.cRedBits = 8; /* Try to get the maximum. */
++p;
break;
case GLX_GREEN_SIZE:
pfd.cGreenBits = 8;
++p;
break;
case GLX_BLUE_SIZE:
pfd.cBlueBits = 8;
++p;
break;
case GLX_ALPHA_SIZE:
pfd.cAlphaBits = 8;
++p;
break;
case GLX_DEPTH_SIZE:
pfd.cDepthBits = 32;
++p;
break;
case GLX_STENCIL_SIZE:
pfd.cStencilBits = *(++p);
break;
case GLX_ACCUM_RED_SIZE:
case GLX_ACCUM_GREEN_SIZE:
case GLX_ACCUM_BLUE_SIZE:
case GLX_ACCUM_ALPHA_SIZE:
/* I believe that WGL only used the cAccumRedBits,
cAccumBlueBits, cAccumGreenBits, and cAccumAlphaBits fields
when returning info about the accumulation buffer precision.
Only cAccumBits is used for requesting an accumulation
buffer. */
pfd.cAccumBits = 1;
++p;
break;
}
++p;
}
/* Let Win32 choose one for us. */
pf = ChoosePixelFormat(XHDC, &pfd);
if (pf > 0) {
match = (PIXELFORMATDESCRIPTOR *) malloc(sizeof(PIXELFORMATDESCRIPTOR));
DescribePixelFormat(XHDC, pf, sizeof(PIXELFORMATDESCRIPTOR), match);
/* ChoosePixelFormat is dumb in that it will return a pixel
format that doesn't have stereo even if it was requested
so we need to make sure that if stereo was selected, we
got it. */
if (stereo) {
if (!(match->dwFlags & PFD_STEREO)) {
free(match);
return NULL;
}
}
/* XXX Brad's Matrix Millenium II has problems creating
color index windows in 24-bit mode (lead to GDI crash)
and 32-bit mode (lead to black window). The cColorBits
filed of the PIXELFORMATDESCRIPTOR returned claims to
have 24 and 32 bits respectively of color indices. 2^24
and 2^32 are ridiculously huge writable colormaps.
Assume that if we get back a color index
PIXELFORMATDESCRIPTOR with 24 or more bits, the
PIXELFORMATDESCRIPTOR doesn't really work and skip it.
-mjk */
if (match->iPixelType == PFD_TYPE_COLORINDEX
&& match->cColorBits >= 24) {
free(match);
return NULL;
}
}
return match;
}
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