Re: [Mesa-dev] is it possible to dynamic load OSMesa?
On Sat, Jul 16, 2011 at 5:19 AM, Paul Gotzel paul.got...@gmail.com wrote:
Patrick,
Good thought but it doesn't work. I don't understand why adding -lOSMesa to
the following makes everything work.
gcc -I../../include -g -O2 -Wall -Wmissing-prototypes -std=c99 -ffast-math
-fvisibility=hidden -fno-strict-aliasing -g -fPIC -D_GNU_SOURCE
-DPTHREADS -DDEBUG -DHAVE_POSIX_MEMALIGN -DUSE_XSHM osdemo.c -L../../lib
-lGL -o osdemo
There must be some other initialization I need to call to get things to work
but I don't understand enough of the details of Mesa to know what is
missing. I've stepped through the mesa context initialization and I cannot
see what is different between the two runs. The odd thing is that
everything seems to work but then I end up what I believe is an empty gl
dispatch table. This is the first time I've looked this so I'm not really
sure what to expect. Any ideas of where to look in the Mesa code?
I am not familiar with OSMesa, but when both GL and OSMesa live in the
same address space, there are two copies of glapi (the dispatch table
and etc.). In your example, it may happen that dynOSMesaMakeCurrent
updates OSMesa's copy of glapi, but glGetIntegerv uses GL's copy of
glapi. But when both libraries are linked at compile time,
dynOSMesaMakeCurrent and glGetIntegerv may happen to use the same copy
of glapi.
Thanks,
Paul
On Fri, Jul 15, 2011 at 3:45 PM, Patrick Baggett baggett.patr...@gmail.com
wrote:
If libOSMesa.so is separate library, then isn't libGL.so too? You're
calling glGetIntegerv() from libGL.so but not from libOSMesa.so -- try doing
dlsym(glGetIntegerv) and removing libGL.so from the link line.
Patrick
On Fri, Jul 15, 2011 at 2:41 PM, Paul Gotzel paul.got...@gmail.com
wrote:
Hello,
I've downloaded the latest 7.10.3 and I need to be able to dynamically
load OSMesa. Is this possible? I've tried to use dlopen and dlsym to load
the functions and all the OSMesa calls return success but when I make the gl
calls I get:
GL User Error: glGetIntegerv called without a rendering context
GL User Error: glGetIntegerv called without a rendering context
GL User Error: glGetIntegerv called without a rendering context
Any help would be appreciated.
Thanks,
Paul
My sample program is as follows. I compile it with the same flags as the
rest of the demo programs without linking to OSMesa.
static void *
loadOSMesa()
{
return dlopen(libOSMesa.so, RTLD_DEEPBIND | RTLD_NOW | RTLD_GLOBAL);
}
static OSMesaContext
dynOSMesaCreateContext()
{
typedef OSMesaContext (*CreateContextProto)( GLenum , GLint , GLint ,
GLint , OSMesaContext );
static void *createPfunc = NULL;
CreateContextProto createContext;
if (createPfunc == NULL)
{
void *handle = loadOSMesa();
if (handle)
{
createPfunc = dlsym(handle, OSMesaCreateContextExt);
}
}
if (createPfunc)
{
createContext = (CreateContextProto)(createPfunc);
return (*createContext)(GL_RGBA, 16, 0, 0, NULL);
}
return 0;
}
static GLboolean
dynOSMesaMakeCurrent(OSMesaContext cid, void * win, GLenum type, GLsizei
w, GLsizei h)
{
typedef GLboolean (*MakeCurrentProto)(OSMesaContext, void *, GLenum,
GLsizei, GLsizei);
static void *currentPfunc = NULL;
MakeCurrentProto makeCurrent;
if (currentPfunc == NULL)
{
void *handle = loadOSMesa();
if (handle)
{
currentPfunc = dlsym(handle, OSMesaMakeCurrent);
}
}
if (currentPfunc)
{
makeCurrent = (MakeCurrentProto)(currentPfunc);
return (*makeCurrent)(cid, win, type, w, h);
}
return GL_FALSE;
}
int
main(int argc, char *argv[])
{
OSMesaContext ctx;
void *buffer;
ctx = dynOSMesaCreateContext();
if (!ctx) {
printf(OSMesaCreateContext failed!\n);
return 0;
}
int Width = 100;
int Height = 100;
/* Allocate the image buffer */
buffer = malloc( Width * Height * 4 * sizeof(GLubyte) );
if (!buffer) {
printf(Alloc image buffer failed!\n);
return 0;
}
/* Bind the buffer to the context and make it current */
if (!dynOSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, Width,
Height )) {
printf(OSMesaMakeCurrent failed!\n);
return 0;
}
{
int z, s, a;
glGetIntegerv(GL_DEPTH_BITS, z);
glGetIntegerv(GL_STENCIL_BITS, s);
glGetIntegerv(GL_ACCUM_RED_BITS, a);
printf(Depth=%d Stencil=%d Accum=%d\n, z, s, a);
}
return 0;
}
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[Mesa-dev] is it possible to dynamic load OSMesa?
Hello,
I've downloaded the latest 7.10.3 and I need to be able to dynamically load
OSMesa. Is this possible? I've tried to use dlopen and dlsym to load the
functions and all the OSMesa calls return success but when I make the gl
calls I get:
GL User Error: glGetIntegerv called without a rendering context
GL User Error: glGetIntegerv called without a rendering context
GL User Error: glGetIntegerv called without a rendering context
Any help would be appreciated.
Thanks,
Paul
My sample program is as follows. I compile it with the same flags as the
rest of the demo programs without linking to OSMesa.
static void *
loadOSMesa()
{
return dlopen(libOSMesa.so, RTLD_DEEPBIND | RTLD_NOW | RTLD_GLOBAL);
}
static OSMesaContext
dynOSMesaCreateContext()
{
typedef OSMesaContext (*CreateContextProto)( GLenum , GLint , GLint ,
GLint , OSMesaContext );
static void *createPfunc = NULL;
CreateContextProto createContext;
if (createPfunc == NULL)
{
void *handle = loadOSMesa();
if (handle)
{
createPfunc = dlsym(handle, OSMesaCreateContextExt);
}
}
if (createPfunc)
{
createContext = (CreateContextProto)(createPfunc);
return (*createContext)(GL_RGBA, 16, 0, 0, NULL);
}
return 0;
}
static GLboolean
dynOSMesaMakeCurrent(OSMesaContext cid, void * win, GLenum type, GLsizei w,
GLsizei h)
{
typedef GLboolean (*MakeCurrentProto)(OSMesaContext, void *, GLenum,
GLsizei, GLsizei);
static void *currentPfunc = NULL;
MakeCurrentProto makeCurrent;
if (currentPfunc == NULL)
{
void *handle = loadOSMesa();
if (handle)
{
currentPfunc = dlsym(handle, OSMesaMakeCurrent);
}
}
if (currentPfunc)
{
makeCurrent = (MakeCurrentProto)(currentPfunc);
return (*makeCurrent)(cid, win, type, w, h);
}
return GL_FALSE;
}
int
main(int argc, char *argv[])
{
OSMesaContext ctx;
void *buffer;
ctx = dynOSMesaCreateContext();
if (!ctx) {
printf(OSMesaCreateContext failed!\n);
return 0;
}
int Width = 100;
int Height = 100;
/* Allocate the image buffer */
buffer = malloc( Width * Height * 4 * sizeof(GLubyte) );
if (!buffer) {
printf(Alloc image buffer failed!\n);
return 0;
}
/* Bind the buffer to the context and make it current */
if (!dynOSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, Width, Height
)) {
printf(OSMesaMakeCurrent failed!\n);
return 0;
}
{
int z, s, a;
glGetIntegerv(GL_DEPTH_BITS, z);
glGetIntegerv(GL_STENCIL_BITS, s);
glGetIntegerv(GL_ACCUM_RED_BITS, a);
printf(Depth=%d Stencil=%d Accum=%d\n, z, s, a);
}
return 0;
}
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Re: [Mesa-dev] is it possible to dynamic load OSMesa?
If libOSMesa.so is separate library, then isn't libGL.so too? You're calling
glGetIntegerv() from libGL.so but not from libOSMesa.so -- try doing
dlsym(glGetIntegerv) and removing libGL.so from the link line.
Patrick
On Fri, Jul 15, 2011 at 2:41 PM, Paul Gotzel paul.got...@gmail.com wrote:
Hello,
I've downloaded the latest 7.10.3 and I need to be able to dynamically load
OSMesa. Is this possible? I've tried to use dlopen and dlsym to load the
functions and all the OSMesa calls return success but when I make the gl
calls I get:
GL User Error: glGetIntegerv called without a rendering context
GL User Error: glGetIntegerv called without a rendering context
GL User Error: glGetIntegerv called without a rendering context
Any help would be appreciated.
Thanks,
Paul
My sample program is as follows. I compile it with the same flags as the
rest of the demo programs without linking to OSMesa.
static void *
loadOSMesa()
{
return dlopen(libOSMesa.so, RTLD_DEEPBIND | RTLD_NOW | RTLD_GLOBAL);
}
static OSMesaContext
dynOSMesaCreateContext()
{
typedef OSMesaContext (*CreateContextProto)( GLenum , GLint , GLint ,
GLint , OSMesaContext );
static void *createPfunc = NULL;
CreateContextProto createContext;
if (createPfunc == NULL)
{
void *handle = loadOSMesa();
if (handle)
{
createPfunc = dlsym(handle, OSMesaCreateContextExt);
}
}
if (createPfunc)
{
createContext = (CreateContextProto)(createPfunc);
return (*createContext)(GL_RGBA, 16, 0, 0, NULL);
}
return 0;
}
static GLboolean
dynOSMesaMakeCurrent(OSMesaContext cid, void * win, GLenum type, GLsizei w,
GLsizei h)
{
typedef GLboolean (*MakeCurrentProto)(OSMesaContext, void *, GLenum,
GLsizei, GLsizei);
static void *currentPfunc = NULL;
MakeCurrentProto makeCurrent;
if (currentPfunc == NULL)
{
void *handle = loadOSMesa();
if (handle)
{
currentPfunc = dlsym(handle, OSMesaMakeCurrent);
}
}
if (currentPfunc)
{
makeCurrent = (MakeCurrentProto)(currentPfunc);
return (*makeCurrent)(cid, win, type, w, h);
}
return GL_FALSE;
}
int
main(int argc, char *argv[])
{
OSMesaContext ctx;
void *buffer;
ctx = dynOSMesaCreateContext();
if (!ctx) {
printf(OSMesaCreateContext failed!\n);
return 0;
}
int Width = 100;
int Height = 100;
/* Allocate the image buffer */
buffer = malloc( Width * Height * 4 * sizeof(GLubyte) );
if (!buffer) {
printf(Alloc image buffer failed!\n);
return 0;
}
/* Bind the buffer to the context and make it current */
if (!dynOSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, Width, Height
)) {
printf(OSMesaMakeCurrent failed!\n);
return 0;
}
{
int z, s, a;
glGetIntegerv(GL_DEPTH_BITS, z);
glGetIntegerv(GL_STENCIL_BITS, s);
glGetIntegerv(GL_ACCUM_RED_BITS, a);
printf(Depth=%d Stencil=%d Accum=%d\n, z, s, a);
}
return 0;
}
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Re: [Mesa-dev] is it possible to dynamic load OSMesa?
Patrick,
Good thought but it doesn't work. I don't understand why adding -lOSMesa to
the following makes everything work.
gcc -I../../include -g -O2 -Wall -Wmissing-prototypes -std=c99 -ffast-math
-fvisibility=hidden -fno-strict-aliasing -g -fPIC -D_GNU_SOURCE
-DPTHREADS -DDEBUG -DHAVE_POSIX_MEMALIGN -DUSE_XSHM osdemo.c -L../../lib
-lGL -o osdemo
There must be some other initialization I need to call to get things to work
but I don't understand enough of the details of Mesa to know what is
missing. I've stepped through the mesa context initialization and I cannot
see what is different between the two runs. The odd thing is that
everything seems to work but then I end up what I believe is an empty gl
dispatch table. This is the first time I've looked this so I'm not really
sure what to expect. Any ideas of where to look in the Mesa code?
Thanks,
Paul
On Fri, Jul 15, 2011 at 3:45 PM, Patrick Baggett
baggett.patr...@gmail.comwrote:
If libOSMesa.so is separate library, then isn't libGL.so too? You're
calling glGetIntegerv() from libGL.so but not from libOSMesa.so -- try doing
dlsym(glGetIntegerv) and removing libGL.so from the link line.
Patrick
On Fri, Jul 15, 2011 at 2:41 PM, Paul Gotzel paul.got...@gmail.comwrote:
Hello,
I've downloaded the latest 7.10.3 and I need to be able to dynamically
load OSMesa. Is this possible? I've tried to use dlopen and dlsym to load
the functions and all the OSMesa calls return success but when I make the gl
calls I get:
GL User Error: glGetIntegerv called without a rendering context
GL User Error: glGetIntegerv called without a rendering context
GL User Error: glGetIntegerv called without a rendering context
Any help would be appreciated.
Thanks,
Paul
My sample program is as follows. I compile it with the same flags as the
rest of the demo programs without linking to OSMesa.
static void *
loadOSMesa()
{
return dlopen(libOSMesa.so, RTLD_DEEPBIND | RTLD_NOW | RTLD_GLOBAL);
}
static OSMesaContext
dynOSMesaCreateContext()
{
typedef OSMesaContext (*CreateContextProto)( GLenum , GLint , GLint ,
GLint , OSMesaContext );
static void *createPfunc = NULL;
CreateContextProto createContext;
if (createPfunc == NULL)
{
void *handle = loadOSMesa();
if (handle)
{
createPfunc = dlsym(handle, OSMesaCreateContextExt);
}
}
if (createPfunc)
{
createContext = (CreateContextProto)(createPfunc);
return (*createContext)(GL_RGBA, 16, 0, 0, NULL);
}
return 0;
}
static GLboolean
dynOSMesaMakeCurrent(OSMesaContext cid, void * win, GLenum type, GLsizei
w, GLsizei h)
{
typedef GLboolean (*MakeCurrentProto)(OSMesaContext, void *, GLenum,
GLsizei, GLsizei);
static void *currentPfunc = NULL;
MakeCurrentProto makeCurrent;
if (currentPfunc == NULL)
{
void *handle = loadOSMesa();
if (handle)
{
currentPfunc = dlsym(handle, OSMesaMakeCurrent);
}
}
if (currentPfunc)
{
makeCurrent = (MakeCurrentProto)(currentPfunc);
return (*makeCurrent)(cid, win, type, w, h);
}
return GL_FALSE;
}
int
main(int argc, char *argv[])
{
OSMesaContext ctx;
void *buffer;
ctx = dynOSMesaCreateContext();
if (!ctx) {
printf(OSMesaCreateContext failed!\n);
return 0;
}
int Width = 100;
int Height = 100;
/* Allocate the image buffer */
buffer = malloc( Width * Height * 4 * sizeof(GLubyte) );
if (!buffer) {
printf(Alloc image buffer failed!\n);
return 0;
}
/* Bind the buffer to the context and make it current */
if (!dynOSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, Width, Height
)) {
printf(OSMesaMakeCurrent failed!\n);
return 0;
}
{
int z, s, a;
glGetIntegerv(GL_DEPTH_BITS, z);
glGetIntegerv(GL_STENCIL_BITS, s);
glGetIntegerv(GL_ACCUM_RED_BITS, a);
printf(Depth=%d Stencil=%d Accum=%d\n, z, s, a);
}
return 0;
}
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