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This commit is contained in:
Gabriele Cosmo
2016-06-09 15:16:48 +02:00
parent 75c7fd177d
commit a8e9364cea
6592 changed files with 84274 additions and 69292 deletions
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source/visualization/OpenGL/src/G4OpenGLXViewer.cc
+92 -559
View File
@@ -24,8 +24,8 @@
// ********************************************************************
//
//
// $Id: G4OpenGLXViewer.cc,v 1.36 2007/02/08 13:47:22 allison Exp $
// GEANT4 tag $Name: geant4-08-03 $
// $Id: G4OpenGLXViewer.cc,v 1.42 2007/05/25 10:47:17 allison Exp $
// GEANT4 tag $Name: geant4-09-00 $
//
//
// Andrew Walkden 7th February 1997
@@ -76,41 +76,11 @@ int G4OpenGLXViewer::dblBuf_RGBA[13] =
#define USE_DEFAULT_COLORMAP 1
#define USE_STANDARD_COLORMAP 0
static const char* gouraudtriangleEPS[] =
{
"/bd{bind def}bind def /triangle { aload pop setrgbcolor aload pop 5 3",
"roll 4 2 roll 3 2 roll exch moveto lineto lineto closepath fill } bd",
"/computediff1 { 2 copy sub abs threshold ge {pop pop pop true} { exch 2",
"index sub abs threshold ge { pop pop true} { sub abs threshold ge } ifelse",
"} ifelse } bd /computediff3 { 3 copy 0 get 3 1 roll 0 get 3 1 roll 0 get",
"computediff1 {true} { 3 copy 1 get 3 1 roll 1 get 3 1 roll 1 get",
"computediff1 {true} { 3 copy 2 get 3 1 roll 2 get 3 1 roll 2 get",
"computediff1 } ifelse } ifelse } bd /middlecolor { aload pop 4 -1 roll",
"aload pop 4 -1 roll add 2 div 5 1 roll 3 -1 roll add 2 div 3 1 roll add 2",
"div 3 1 roll exch 3 array astore } bd /gouraudtriangle { computediff3 { 4",
"-1 roll aload 7 1 roll 6 -1 roll pop 3 -1 roll pop add 2 div 3 1 roll add",
"2 div exch 3 -1 roll aload 7 1 roll exch pop 4 -1 roll pop add 2 div 3 1",
"roll add 2 div exch 3 -1 roll aload 7 1 roll pop 3 -1 roll pop add 2 div 3",
"1 roll add 2 div exch 7 3 roll 10 -3 roll dup 3 index middlecolor 4 1 roll",
"2 copy middlecolor 4 1 roll 3 copy pop middlecolor 4 1 roll 13 -1 roll",
"aload pop 17 index 6 index 15 index 19 index 6 index 17 index 6 array",
"astore 10 index 10 index 14 index gouraudtriangle 17 index 5 index 17",
"index 19 index 5 index 19 index 6 array astore 10 index 9 index 13 index",
"gouraudtriangle 13 index 16 index 5 index 15 index 18 index 5 index 6",
"array astore 12 index 12 index 9 index gouraudtriangle 17 index 16 index",
"15 index 19 index 18 index 17 index 6 array astore 10 index 12 index 14",
"index gouraudtriangle 18 {pop} repeat } { aload pop 5 3 roll aload pop 7 3",
"roll aload pop 9 3 roll 4 index 6 index 4 index add add 3 div 10 1 roll 7",
"index 5 index 3 index add add 3 div 10 1 roll 6 index 4 index 2 index add",
"add 3 div 10 1 roll 9 {pop} repeat 3 array astore triangle } ifelse } bd",
NULL
};
XVisualInfo* G4OpenGLXViewer::vi_single_buffer = 0;
XVisualInfo* G4OpenGLXViewer::vi_double_buffer = 0;
extern "C" {
Bool G4OpenGLXViewerWaitForNotify (Display*, XEvent* e, char* arg) {
static Bool G4OpenGLXViewerWaitForNotify (Display*, XEvent* e, char* arg) {
return (e->type == MapNotify) && (e->xmap.window == (Window) arg);
}
}
@@ -124,6 +94,21 @@ void G4OpenGLXViewer::ShowView () {
glXWaitGL (); //Wait for effects of all previous OpenGL commands to
//be propagated before progressing.
glFlush ();
if (fVP.IsPicking()) {
G4cout <<
"Window activated for picking (left-mouse), exit (middle-mouse)."
<< G4endl;
while (true) {
if (XPending(dpy)) {
XNextEvent(dpy, &event);
if (event.type == ButtonPress && event.xbutton.button == 1) {
Pick(event.xbutton.x, event.xbutton.y);
}
else if (event.type == ButtonPress && event.xbutton.button == 2) break;
}
}
}
}
void G4OpenGLXViewer::GetXConnection () {
@@ -307,7 +292,17 @@ void G4OpenGLXViewer::CreateMainWindow () {
XIfEvent (dpy, &event, G4OpenGLXViewerWaitForNotify, (char*) win);
// connect the context to a window
glXMakeCurrent (dpy, win, cx);
Bool success = glXMakeCurrent (dpy, win, cx);
if (!success) {
fViewId = -1; // This flags an error.
G4cerr << "G4OpenGLViewer::G4OpenGLViewer failed to attach a GLX context."
<< G4endl;
GLint error = GL_NO_ERROR;
while ((error = glGetError()) != GL_NO_ERROR) {
G4cout << "GL Error: " << gluErrorString(error) << G4endl;
}
return;
}
}
@@ -351,15 +346,11 @@ void G4OpenGLXViewer::CreateFontLists () {
G4OpenGLXViewer::G4OpenGLXViewer (G4OpenGLSceneHandler& scene):
G4VViewer (scene, -1),
G4OpenGLViewer (scene),
print_colour (true),
vectored_ps (true),
vi_immediate (0),
vi_stored (0),
vi (0),
cmap (0)
{
strcpy (print_string, "G4OpenGL.eps");
GetXConnection ();
if (fViewId < 0) return;
@@ -442,36 +433,19 @@ void G4OpenGLXViewer::print() {
//cout << "print_col_callback requested with file name: " << print_string << G4endl;
if (vectored_ps) {
G4int size = 5000000;
GLfloat* feedback_buffer;
GLint returned;
FILE* file;
feedback_buffer = new GLfloat[size];
glFeedbackBuffer (size, GL_3D_COLOR, feedback_buffer);
glRenderMode (GL_FEEDBACK);
DrawView();
returned = glRenderMode (GL_RENDER);
if (print_string) {
file = fopen (print_string, "w");
if (file) {
spewWireframeEPS (file, returned, feedback_buffer, "rendereps");
} else {
printf("Could not open %s\n", print_string);
}
} else {
printBuffer (returned, feedback_buffer);
}
// free (feedback_buffer);
delete[] feedback_buffer;
G4OpenGLViewer::print();
} else {
XVisualInfo* pvi;
GLXContext pcx = create_GL_print_context(pvi);
if (!pcx) {
G4cout << "Unable to create print context." << G4endl;
return;
}
GLXContext tmp_cx;
tmp_cx = cx;
cx=pcx;
@@ -496,6 +470,7 @@ void G4OpenGLXViewer::print() {
glViewport (0, 0, WinSize_x, WinSize_y);
ClearView ();
SetView ();
DrawView ();
generateEPS (print_string,
@@ -513,464 +488,53 @@ void G4OpenGLXViewer::print() {
}
void G4OpenGLXViewer::print3DcolorVertex(GLint size, GLint * count, GLfloat * buffer)
{
G4int i;
printf(" ");
for (i = 0; i < 7; i++) {
printf("%4.2f ", buffer[size - (*count)]);
*count = *count - 1;
}
printf("\n");
}
void G4OpenGLXViewer::spewWireframeEPS (FILE* file, GLint size, GLfloat* buffer, const char* cr) {
GLfloat EPS_GOURAUD_THRESHOLD=0.1;
GLfloat clearColor[4], viewport[4];
GLfloat lineWidth;
G4int i;
glGetFloatv (GL_VIEWPORT, viewport);
glGetFloatv (GL_COLOR_CLEAR_VALUE, clearColor);
glGetFloatv (GL_LINE_WIDTH, &lineWidth);
glGetFloatv (GL_POINT_SIZE, &pointSize);
fputs ("%!PS-Adobe-2.0 EPSF-2.0\n", file);
fprintf (file, "%%%%Creator: %s (using OpenGL feedback)\n", cr);
fprintf (file, "%%%%BoundingBox: %g %g %g %g\n", viewport[0], viewport[1], viewport[2], viewport[3]);
fputs ("%%EndComments\n", file);
fputs ("\n", file);
fputs ("gsave\n", file);
fputs ("\n", file);
fputs ("% the gouraudtriangle PostScript fragment below is free\n", file);
fputs ("% written by Frederic Delhoume (delhoume@ilog.fr)\n", file);
fprintf (file, "/threshold %g def\n", EPS_GOURAUD_THRESHOLD);
for (i=0; gouraudtriangleEPS[i]; i++) {
fprintf (file, "%s\n", gouraudtriangleEPS[i]);
}
fprintf(file, "\n%g setlinewidth\n", lineWidth);
GLubyte* G4OpenGLXViewer::grabPixels (int inColor, unsigned int width, unsigned int height) {
fprintf (file, "%g %g %g setrgbcolor\n", clearColor[0], clearColor[1], clearColor[2]);
fprintf (file, "%g %g %g %g rectfill\n\n", viewport[0], viewport[1], viewport[2], viewport[3]);
GLubyte* buffer;
GLint swapbytes, lsbfirst, rowlength;
GLint skiprows, skippixels, alignment;
GLenum format;
int size;
spewSortedFeedback (file, size, buffer);
fputs ("grestore\n\n", file);
fputs ("showpage\n", file);
fclose(file);
}
void G4OpenGLXViewer::printBuffer (GLint size, GLfloat* buffer) {
GLint count;
G4int token, nvertices;
count=size;
while(count) {
token=G4int (buffer[size-count]);
count--;
switch (token) {
case GL_PASS_THROUGH_TOKEN:
printf ("GL_PASS_THROUGH_TOKEN\n");
printf (" %4.2f\n", buffer[size-count]);
count--;
break;
case GL_POINT_TOKEN:
printf ("GL_POINT_TOKEN\n");
print3DcolorVertex (size, &count, buffer);
break;
case GL_LINE_TOKEN:
printf ("GL_LINE_TOKEN\n");
print3DcolorVertex (size, &count, buffer);
print3DcolorVertex (size, &count, buffer);
break;
case GL_LINE_RESET_TOKEN:
printf ("GL_LINE_RESET_TOKEN\n");
print3DcolorVertex (size, &count, buffer);
print3DcolorVertex (size, &count, buffer);
break;
case GL_POLYGON_TOKEN:
printf ("GL_POLYGON_TOKEN\n");
nvertices=G4int (buffer[size-count]);
count--;
for (; nvertices>0; nvertices--) {
print3DcolorVertex (size, &count, buffer);
}
}
if (inColor) {
format = GL_RGB;
size = width*height*3;
} else {
format = GL_LUMINANCE;
size = width*height*1;
}
}
G4float* G4OpenGLXViewer::spewPrimitiveEPS (FILE* file, GLfloat* loc) {
buffer = new GLubyte[size];
if (buffer == NULL)
return NULL;
glGetIntegerv (GL_UNPACK_SWAP_BYTES, &swapbytes);
glGetIntegerv (GL_UNPACK_LSB_FIRST, &lsbfirst);
glGetIntegerv (GL_UNPACK_ROW_LENGTH, &rowlength);
glGetIntegerv (GL_UNPACK_SKIP_ROWS, &skiprows);
glGetIntegerv (GL_UNPACK_SKIP_PIXELS, &skippixels);
glGetIntegerv (GL_UNPACK_ALIGNMENT, &alignment);
glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
glReadPixels (0, 0, (GLsizei)width, (GLsizei)height, format, GL_UNSIGNED_BYTE, (GLvoid*) buffer);
glPixelStorei (GL_UNPACK_SWAP_BYTES, swapbytes);
glPixelStorei (GL_UNPACK_LSB_FIRST, lsbfirst);
glPixelStorei (GL_UNPACK_ROW_LENGTH, rowlength);
G4int token;
G4int nvertices, i;
GLfloat red, green, blue, intensity;
G4int smooth;
GLfloat dx, dy, dr, dg, db, absR, absG, absB, colormax;
G4int steps;
Feedback3Dcolor *vertex;
GLfloat xstep(0.), ystep(0.), rstep(0.), gstep(0.), bstep(0.);
GLfloat xnext(0.), ynext(0.), rnext(0.), gnext(0.), bnext(0.), distance(0.);
token=G4int (*loc);
loc++;
switch (token) {
case GL_LINE_RESET_TOKEN:
case GL_LINE_TOKEN:
vertex=(Feedback3Dcolor*)loc;
dr=vertex[1].red - vertex[0].red;
dg=vertex[1].green - vertex[0].green;
db=vertex[1].blue - vertex[0].blue;
if (!print_colour) {
dr+=(dg+db);
dr/=3.0;
dg=dr;
db=dr;
}
if (dr!=0 || dg!=0 || db!=0) {
dx=vertex[1].x - vertex[0].x;
dy=vertex[1].y - vertex[0].y;
distance=std::sqrt(dx*dx + dy*dy);
absR=std::fabs(dr);
absG=std::fabs(dg);
absB=std::fabs(db);
#define Max(a, b) (((a)>(b))?(a):(b))
#define EPS_SMOOTH_LINE_FACTOR 0.06
colormax=Max(absR, Max(absG, absB));
steps=Max(1, G4int (colormax*distance*EPS_SMOOTH_LINE_FACTOR));
xstep=dx/steps;
ystep=dy/steps;
rstep=dr/steps;
gstep=dg/steps;
bstep=db/steps;
xnext=vertex[0].x;
ynext=vertex[0].y;
rnext=vertex[0].red;
gnext=vertex[0].green;
bnext=vertex[0].blue;
if (!print_colour) {
rnext+=(gnext+bnext);
rnext/=3.0;
gnext=rnext;
bnext=rnext;
}
xnext -= xstep/2.0;
ynext -= ystep/2.0;
rnext -= rstep/2.0;
gnext -= gstep/2.0;
bnext -= bstep/2.0;
} else {
steps=0;
}
if (print_colour) {
fprintf (file, "%g %g %g setrgbcolor\n",
vertex[0].red, vertex[0].green, vertex[0].blue);
} else {
intensity = (vertex[0].red + vertex[0].green + vertex[0].blue) / 3.0;
fprintf (file, "%g %g %g setrgbcolor\n",
intensity, intensity, intensity);
}
fprintf (file, "%g %g moveto\n", vertex[0].x, vertex[0].y);
for (i=0; i<steps; i++) {
xnext += xstep;
ynext += ystep;
rnext += rstep;
gnext += gstep;
bnext += bstep;
fprintf (file, "%g %g lineto stroke\n", xnext, ynext);
fprintf (file, "%g %g %g setrgbcolor\n", rnext, gnext, bnext);
fprintf (file, "%g %g moveto\n", xnext, ynext);
}
fprintf (file, "%g %g lineto stroke\n", vertex[1].x, vertex[1].y);
loc += 14;
break;
case GL_POLYGON_TOKEN:
nvertices = G4int (*loc);
loc++;
vertex=(Feedback3Dcolor*)loc;
if (nvertices>0) {
red=vertex[0].red;
green=vertex[0].green;
blue=vertex[0].blue;
smooth=0;
if (!print_colour) {
red+=(green+blue);
red/=3.0;
green=red;
blue=red;
}
if (print_colour) {
for (i=1; i<nvertices; i++) {
if (red!=vertex[i].red || green!=vertex[i].green || blue!=vertex[i].blue) {
smooth=1;
break;
}
}
} else {
for (i=1; i<nvertices; i++) {
intensity = vertex[i].red + vertex[i].green + vertex[i].blue;
intensity/=3.0;
if (red!=intensity) {
smooth=1;
break;
}
}
}
if (smooth) {
G4int triOffset;
for (i=0; i<nvertices-2; i++) {
triOffset = i*7;
fprintf (file, "[%g %g %g %g %g %g]",
vertex[0].x, vertex[i+1].x, vertex[i+2].x,
vertex[0].y, vertex[i+1].y, vertex[i+2].y);
if (print_colour) {
fprintf (file, " [%g %g %g] [%g %g %g] [%g %g %g] gouraudtriangle\n",
vertex[0].red, vertex[0].green, vertex[0].blue,
vertex[i+1].red, vertex[i+1].green, vertex[i+1].blue,
vertex[i+2].red, vertex[i+2].green, vertex[i+2].blue);
} else {
intensity = vertex[0].red + vertex[0].green + vertex[0].blue;
intensity/=3.0;
fprintf (file, " [%g %g %g]", intensity, intensity, intensity);
intensity = vertex[1].red + vertex[1].green + vertex[1].blue;
intensity/=3.0;
fprintf (file, " [%g %g %g]", intensity, intensity, intensity);
intensity = vertex[2].red + vertex[2].green + vertex[2].blue;
intensity/=3.0;
fprintf (file, " [%g %g %g] gouraudtriangle\n", intensity, intensity, intensity);
}
}
} else {
fprintf (file, "newpath\n");
fprintf (file, "%g %g %g setrgbcolor\n", red, green, blue);
fprintf (file, "%g %g moveto\n", vertex[0].x, vertex[0].y);
for (i=1; i<nvertices; i++) {
fprintf (file, "%g %g lineto\n", vertex[i].x, vertex[i].y);
}
fprintf (file, "closepath fill\n\n");
}
}
loc += nvertices*7;
break;
case GL_POINT_TOKEN:
vertex=(Feedback3Dcolor*)loc;
if (print_colour) {
fprintf (file, "%g %g %g setrgbcolor\n", vertex[0].red, vertex[0].green, vertex[0].blue);
} else {
intensity = vertex[0].red + vertex[0].green + vertex[0].blue;
intensity/=3.0;
fprintf (file, "%g %g %g setrgbcolor\n", intensity, intensity, intensity);
}
fprintf(file, "%g %g %g 0 360 arc fill\n\n", vertex[0].x, vertex[0].y, pointSize / 2.0);
loc += 7; /* Each vertex element in the feedback
buffer is 7 GLfloats. */
break;
default:
/* XXX Left as an excersie to the reader. */
static G4bool spewPrimitiveEPSWarned = false;
if (!spewPrimitiveEPSWarned) {
std::ostringstream oss;
oss <<
"Incomplete implementation. Unexpected token (" << token << ")."
"\n (Seems to be caused by text.)";
G4Exception("G4OpenGLXViewer::spewPrimitiveEPS",
"Unexpected token",
JustWarning,
oss.str().c_str());
spewPrimitiveEPSWarned = true;
}
}
return loc;
}
typedef struct G4OpenGLXViewerDepthIndex {
GLfloat *ptr;
GLfloat depth;
} DepthIndex;
extern "C" {
int G4OpenGLXViewercompare(const void *a, const void *b)
{
const DepthIndex *p1 = (DepthIndex *) a;
const DepthIndex *p2 = (DepthIndex *) b;
GLfloat diff = p2->depth - p1->depth;
if (diff > 0.0) {
return 1;
} else if (diff < 0.0) {
return -1;
} else {
return 0;
}
}
}
void G4OpenGLXViewer::spewSortedFeedback(FILE * file, GLint size, GLfloat * buffer)
{
int token;
GLfloat *loc, *end;
Feedback3Dcolor *vertex;
GLfloat depthSum;
int nprimitives, item;
DepthIndex *prims;
int nvertices, i;
end = buffer + size;
/* Count how many primitives there are. */
nprimitives = 0;
loc = buffer;
while (loc < end) {
token = int (*loc);
loc++;
switch (token) {
case GL_LINE_TOKEN:
case GL_LINE_RESET_TOKEN:
loc += 14;
nprimitives++;
break;
case GL_POLYGON_TOKEN:
nvertices = int (*loc);
loc++;
loc += (7 * nvertices);
nprimitives++;
break;
case GL_POINT_TOKEN:
loc += 7;
nprimitives++;
break;
default:
/* XXX Left as an excersie to the reader. */
static G4bool spewSortedFeedbackWarned = false;
if (!spewSortedFeedbackWarned) {
std::ostringstream oss;
oss <<
"Incomplete implementation. Unexpected token (" << token << ")."
"\n (Seems to be caused by text.)";
G4Exception("G4OpenGLXViewer::spewSortedFeedback",
"Unexpected token",
JustWarning,
oss.str().c_str());
spewSortedFeedbackWarned = true;
}
nprimitives++;
}
}
/* Allocate an array of pointers that will point back at
primitives in the feedback buffer. There will be one
entry per primitive. This array is also where we keep the
primitive's average depth. There is one entry per
primitive in the feedback buffer. */
prims = (DepthIndex *) malloc(sizeof(DepthIndex) * nprimitives);
item = 0;
loc = buffer;
while (loc < end) {
prims[item].ptr = loc; /* Save this primitive's location. */
token = int (*loc);
loc++;
switch (token) {
case GL_LINE_TOKEN:
case GL_LINE_RESET_TOKEN:
vertex = (Feedback3Dcolor *) loc;
depthSum = vertex[0].z + vertex[1].z;
prims[item].depth = depthSum / 2.0;
loc += 14;
break;
case GL_POLYGON_TOKEN:
nvertices = int (*loc);
loc++;
vertex = (Feedback3Dcolor *) loc;
depthSum = vertex[0].z;
for (i = 1; i < nvertices; i++) {
depthSum += vertex[i].z;
}
prims[item].depth = depthSum / nvertices;
loc += (7 * nvertices);
break;
case GL_POINT_TOKEN:
vertex = (Feedback3Dcolor *) loc;
prims[item].depth = vertex[0].z;
loc += 7;
break;
default:
/* XXX Left as an excersie to the reader. */
assert(1);
}
item++;
}
assert(item == nprimitives);
/* Sort the primitives back to front. */
qsort(prims, nprimitives, sizeof(DepthIndex), G4OpenGLXViewercompare);
/* Understand that sorting by a primitives average depth
doesn't allow us to disambiguate some cases like self
intersecting polygons. Handling these cases would require
breaking up the primitives. That's too involved for this
example. Sorting by depth is good enough for lots of
applications. */
/* Emit the Encapsulated PostScript for the primitives in
back to front order. */
for (item = 0; item < nprimitives; item++) {
(void) spewPrimitiveEPS(file, prims[item].ptr);
}
free(prims);
}
GLXContext G4OpenGLXViewer::create_GL_print_context(XVisualInfo*& pvi) {
glPixelStorei (GL_UNPACK_SKIP_ROWS, skiprows);
glPixelStorei (GL_UNPACK_SKIP_PIXELS, skippixels);
glPixelStorei (GL_UNPACK_ALIGNMENT, alignment);
pvi = glXChooseVisual (dpy,
XDefaultScreen (dpy),
snglBuf_RGBA);
if (!pvi) {
pvi = glXChooseVisual (dpy,
XDefaultScreen (dpy),
dblBuf_RGBA);
}
return glXCreateContext (dpy,
pvi,
NULL,
False);
return buffer;
}
int G4OpenGLXViewer::generateEPS (char* filnam,
@@ -1050,53 +614,22 @@ int G4OpenGLXViewer::generateEPS (char* filnam,
return 0;
}
GLubyte* G4OpenGLXViewer::grabPixels (int inColor, unsigned int width, unsigned int height) {
GLXContext G4OpenGLXViewer::create_GL_print_context(XVisualInfo*& pvi) {
GLubyte* buffer;
GLint swapbytes, lsbfirst, rowlength;
GLint skiprows, skippixels, alignment;
GLenum format;
int size;
pvi = glXChooseVisual (dpy,
XDefaultScreen (dpy),
snglBuf_RGBA);
if (inColor) {
format = GL_RGB;
size = width*height*3;
} else {
format = GL_LUMINANCE;
size = width*height*1;
if (!pvi) {
pvi = glXChooseVisual (dpy,
XDefaultScreen (dpy),
dblBuf_RGBA);
}
buffer = new GLubyte[size];
if (buffer == NULL)
return NULL;
glGetIntegerv (GL_UNPACK_SWAP_BYTES, &swapbytes);
glGetIntegerv (GL_UNPACK_LSB_FIRST, &lsbfirst);
glGetIntegerv (GL_UNPACK_ROW_LENGTH, &rowlength);
glGetIntegerv (GL_UNPACK_SKIP_ROWS, &skiprows);
glGetIntegerv (GL_UNPACK_SKIP_PIXELS, &skippixels);
glGetIntegerv (GL_UNPACK_ALIGNMENT, &alignment);
glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
glReadPixels (0, 0, (GLsizei)width, (GLsizei)height, format, GL_UNSIGNED_BYTE, (GLvoid*) buffer);
glPixelStorei (GL_UNPACK_SWAP_BYTES, swapbytes);
glPixelStorei (GL_UNPACK_LSB_FIRST, lsbfirst);
glPixelStorei (GL_UNPACK_ROW_LENGTH, rowlength);
glPixelStorei (GL_UNPACK_SKIP_ROWS, skiprows);
glPixelStorei (GL_UNPACK_SKIP_PIXELS, skippixels);
glPixelStorei (GL_UNPACK_ALIGNMENT, alignment);
return buffer;
return glXCreateContext (dpy,
pvi,
NULL,
False);
}
#endif