gecko/gfx/thebes/GLContextProviderOSMesa.cpp
2010-10-12 17:01:59 -04:00

297 lines
9.4 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Benoit Jacob <bjacob@mozilla.com>
* Bas Schouten <bschouten@mozilla.com>
* Vladimir Vukicevic <vladimir@pobox.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "GLContextProvider.h"
#include "GLContext.h"
#include "nsDebug.h"
#include "nsString.h"
#include "nsIWidget.h"
#include "nsDirectoryServiceUtils.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsIConsoleService.h"
#include "nsIPrefService.h"
#include "gfxASurface.h"
#include "gfxImageSurface.h"
// from GL/osmesa.h. We don't include that file so as to avoid having a build-time dependency on OSMesa.
#define OSMESA_RGBA GL_RGBA
#define OSMESA_BGRA 0x1
#define OSMESA_ARGB 0x2
#define OSMESA_RGB GL_RGB
#define OSMESA_BGR 0x4
#define OSMESA_RGB_565 0x5
#define OSMESA_Y_UP 0x11
namespace mozilla {
namespace gl {
static void LogMessage(const char *msg)
{
nsCOMPtr<nsIConsoleService> console(do_GetService(NS_CONSOLESERVICE_CONTRACTID));
if (console) {
console->LogStringMessage(NS_ConvertUTF8toUTF16(nsDependentCString(msg)).get());
fprintf(stderr, "%s\n", msg);
}
}
typedef void* PrivateOSMesaContext;
class OSMesaLibrary
{
public:
OSMesaLibrary() : mInitialized(PR_FALSE), mOSMesaLibrary(nsnull) {}
typedef PrivateOSMesaContext (GLAPIENTRY * PFNOSMESACREATECONTEXTEXT) (GLenum, GLint, GLint, GLint, PrivateOSMesaContext);
typedef void (GLAPIENTRY * PFNOSMESADESTROYCONTEXT) (PrivateOSMesaContext);
typedef bool (GLAPIENTRY * PFNOSMESAMAKECURRENT) (PrivateOSMesaContext, void *, GLenum, GLsizei, GLsizei);
typedef PrivateOSMesaContext (GLAPIENTRY * PFNOSMESAGETCURRENTCONTEXT) (void);
typedef void (GLAPIENTRY * PFNOSMESAPIXELSTORE) (GLint, GLint);
typedef PRFuncPtr (GLAPIENTRY * PFNOSMESAGETPROCADDRESS) (const char*);
PFNOSMESACREATECONTEXTEXT fCreateContextExt;
PFNOSMESADESTROYCONTEXT fDestroyContext;
PFNOSMESAMAKECURRENT fMakeCurrent;
PFNOSMESAGETCURRENTCONTEXT fGetCurrentContext;
PFNOSMESAPIXELSTORE fPixelStore;
PFNOSMESAGETPROCADDRESS fGetProcAddress;
PRBool EnsureInitialized();
private:
PRBool mInitialized;
PRLibrary *mOSMesaLibrary;
};
OSMesaLibrary sOSMesaLibrary;
PRBool
OSMesaLibrary::EnsureInitialized()
{
if (mInitialized)
return PR_TRUE;
nsresult rv;
nsCOMPtr<nsIPrefService> prefService = do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, PR_FALSE);
nsCOMPtr<nsIPrefBranch> prefBranch;
rv = prefService->GetBranch("webgl.", getter_AddRefs(prefBranch));
NS_ENSURE_SUCCESS(rv, PR_FALSE);
nsCString osmesalib;
rv = prefBranch->GetCharPref("osmesalib", getter_Copies(osmesalib));
if (NS_FAILED(rv) ||
osmesalib.Length() == 0)
{
return PR_FALSE;
}
mOSMesaLibrary = PR_LoadLibrary(osmesalib.get());
if (!mOSMesaLibrary) {
LogMessage("Couldn't open OSMesa lib for software rendering -- webgl.osmesalib path is incorrect, or not a valid shared library");
return PR_FALSE;
}
LibrarySymbolLoader::SymLoadStruct symbols[] = {
{ (PRFuncPtr*) &fCreateContextExt, { "OSMesaCreateContextExt", NULL } },
{ (PRFuncPtr*) &fMakeCurrent, { "OSMesaMakeCurrent", NULL } },
{ (PRFuncPtr*) &fPixelStore, { "OSMesaPixelStore", NULL } },
{ (PRFuncPtr*) &fDestroyContext, { "OSMesaDestroyContext", NULL } },
{ (PRFuncPtr*) &fGetCurrentContext, { "OSMesaGetCurrentContext", NULL } },
{ (PRFuncPtr*) &fMakeCurrent, { "OSMesaMakeCurrent", NULL } },
{ (PRFuncPtr*) &fGetProcAddress, { "OSMesaGetProcAddress", NULL } },
{ NULL, { NULL } }
};
if (!LibrarySymbolLoader::LoadSymbols(mOSMesaLibrary, &symbols[0])) {
LogMessage("Couldn't find required entry points in OSMesa libary");
return PR_FALSE;
}
mInitialized = PR_TRUE;
return PR_TRUE;
}
class GLContextOSMesa : public GLContext
{
public:
GLContextOSMesa(const ContextFormat& aFormat)
: GLContext(aFormat, PR_TRUE, nsnull),
mThebesSurface(nsnull),
mContext(nsnull)
{
}
~GLContextOSMesa()
{
MarkDestroyed();
if (mContext)
sOSMesaLibrary.fDestroyContext(mContext);
}
GLContextType GetContextType() {
return ContextTypeOSMesa;
}
PRBool Init(const gfxIntSize &aSize)
{
int osmesa_format = -1;
int gfxasurface_imageformat = -1;
PRBool format_accepted = PR_FALSE;
if (mCreationFormat.red > 0 &&
mCreationFormat.green > 0 &&
mCreationFormat.blue > 0 &&
mCreationFormat.red <= 8 &&
mCreationFormat.green <= 8 &&
mCreationFormat.blue <= 8)
{
if (mCreationFormat.alpha == 0) {
// we can't use OSMESA_BGR because it is packed 24 bits per pixel.
// So we use OSMESA_BGRA and have to use ImageFormatRGB24
// to make sure that the dummy alpha channel is ignored.
osmesa_format = OSMESA_BGRA;
gfxasurface_imageformat = gfxASurface::ImageFormatRGB24;
format_accepted = PR_TRUE;
} else if (mCreationFormat.alpha <= 8) {
osmesa_format = OSMESA_BGRA;
gfxasurface_imageformat = gfxASurface::ImageFormatARGB32;
format_accepted = PR_TRUE;
}
}
if (!format_accepted) {
NS_WARNING("Pixel format not supported with OSMesa.");
return PR_FALSE;
}
mThebesSurface = new gfxImageSurface(aSize, gfxASurface::gfxImageFormat(gfxasurface_imageformat));
if (mThebesSurface->CairoStatus() != 0) {
NS_WARNING("image surface failed");
return PR_FALSE;
}
mContext = sOSMesaLibrary.fCreateContextExt(osmesa_format, mCreationFormat.depth, mCreationFormat.stencil, 0, NULL);
if (!mContext) {
NS_WARNING("OSMesaCreateContextExt failed!");
return PR_FALSE;
}
if (!MakeCurrent()) return PR_FALSE;
if (!SetupLookupFunction()) return PR_FALSE;
// OSMesa's different from the other GL providers, it renders to an image surface, not to a pbuffer
sOSMesaLibrary.fPixelStore(OSMESA_Y_UP, 0);
return InitWithPrefix("gl", PR_TRUE);
}
PRBool MakeCurrentImpl(PRBool aForce = PR_FALSE)
{
PRBool succeeded
= sOSMesaLibrary.fMakeCurrent(mContext, mThebesSurface->Data(),
LOCAL_GL_UNSIGNED_BYTE,
mThebesSurface->Width(),
mThebesSurface->Height());
NS_ASSERTION(succeeded, "Failed to make OSMesa context current!");
return succeeded;
}
PRBool SetupLookupFunction()
{
mLookupFunc = (PlatformLookupFunction)sOSMesaLibrary.fGetProcAddress;
return PR_TRUE;
}
void *GetNativeData(NativeDataType aType)
{
switch (aType) {
case NativeImageSurface:
return mThebesSurface.get();
default:
return nsnull;
}
}
private:
nsRefPtr<gfxImageSurface> mThebesSurface;
PrivateOSMesaContext mContext;
};
already_AddRefed<GLContext>
GLContextProviderOSMesa::CreateForWindow(nsIWidget *aWidget)
{
return nsnull;
}
already_AddRefed<GLContext>
GLContextProviderOSMesa::CreateOffscreen(const gfxIntSize& aSize,
const ContextFormat& aFormat)
{
if (!sOSMesaLibrary.EnsureInitialized()) {
return nsnull;
}
nsRefPtr<GLContextOSMesa> glContext = new GLContextOSMesa(aFormat);
if (!glContext->Init(aSize))
{
return nsnull;
}
return glContext.forget();
}
GLContext *
GLContextProviderOSMesa::GetGlobalContext()
{
return nsnull;
}
void
GLContextProviderOSMesa::Shutdown()
{
}
} /* namespace gl */
} /* namespace mozilla */