remove OpenGL VCL backend code

It is by now practically unmaintained, even bugreports in bugzilla
have been already closed for it. AFAICT this used to be really
used only on Windows, where it's no longer the default.

There's still some OpenGL code left, because there are still two
other places that use OpenGL. One is OpenGL slideshows, which
reuse some of the base OpenGL code (and I've checked they
still work even after this removal). Second one is OpenGL canvas,
which it seems has never been finished or enabled (or so it
most probably should be dumped too).

Change-Id: I7ea5aef77ec252eb8e712d167db591209be84a13
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107290
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

2 files changed, 0 insertions, 336 deletions

diff --git a/vcl/source/opengl/OpenGLContext.cxx b/vcl/source/opengl/OpenGLContext.cxx
index c959dac4db55..aa2093af4b6f 100644
--- a/vcl/source/opengl/OpenGLContext.cxx
+++ b/vcl/source/opengl/OpenGLContext.cxx
@@ -22,19 +22,12 @@
 #include <salgdi.hxx>
 #include <salinst.hxx>
 
-#include <opengl/framebuffer.hxx>
-#include <opengl/program.hxx>
-#include <opengl/texture.hxx>
 #include <opengl/zone.hxx>
 
-#include <opengl/RenderState.hxx>
-
 #include <config_features.h>
 
 using namespace com::sun::star;
 
-#define MAX_FRAMEBUFFER_COUNT 30
-
 static sal_Int64 nBufferSwapCounter = 0;
 
 GLWindow::~GLWindow()
@@ -52,13 +45,6 @@ OpenGLContext::OpenGLContext():
     mbInitialized(false),
     mnRefCount(0),
     mbRequestLegacyContext(false),
-    mbVCLOnly(false),
-    mnFramebufferCount(0),
-    mpCurrentFramebuffer(nullptr),
-    mpFirstFramebuffer(nullptr),
-    mpLastFramebuffer(nullptr),
-    mpCurrentProgram(nullptr),
-    mpRenderState(new RenderState),
     mpPrevContext(nullptr),
     mpNextContext(nullptr)
 {
@@ -354,31 +340,6 @@ void OpenGLContext::reset()
 
     // reset the clip region
     maClipRegion.SetEmpty();
-    mpRenderState.reset(new RenderState);
-
-    // destroy all framebuffers
-    if( mpLastFramebuffer )
-    {
-        OpenGLFramebuffer* pFramebuffer = mpLastFramebuffer;
-
-        makeCurrent();
-        while( pFramebuffer )
-        {
-            OpenGLFramebuffer* pPrevFramebuffer = pFramebuffer->mpPrevFramebuffer;
-            delete pFramebuffer;
-            pFramebuffer = pPrevFramebuffer;
-        }
-        mnFramebufferCount = 0;
-        mpFirstFramebuffer = nullptr;
-        mpLastFramebuffer = nullptr;
-    }
-
-    // destroy all programs
-    if( !maPrograms.empty() )
-    {
-        makeCurrent();
-        maPrograms.clear();
-    }
 
     if( isCurrent() )
         resetCurrent();
@@ -428,13 +389,6 @@ bool OpenGLContext::hasCurrent()
 
 void OpenGLContext::clearCurrent()
 {
-    ImplSVData* pSVData = ImplGetSVData();
-
-    // release all framebuffers from the old context so we can re-attach the
-    // texture in the new context
-    rtl::Reference<OpenGLContext> pCurrentCtx = pSVData->maGDIData.mpLastContext;
-    if( pCurrentCtx.is() && pCurrentCtx->isCurrent() )
-        pCurrentCtx->ReleaseFramebuffers();
 }
 
 void OpenGLContext::prepareForYield()
@@ -467,46 +421,6 @@ void OpenGLContext::prepareForYield()
     assert (!hasCurrent());
 }
 
-rtl::Reference<OpenGLContext> OpenGLContext::getVCLContext(bool bMakeIfNecessary)
-{
-    ImplSVData* pSVData = ImplGetSVData();
-    OpenGLContext *pContext = pSVData->maGDIData.mpLastContext;
-    while( pContext )
-    {
-        // check if this context is usable
-        if( pContext->isInitialized() && pContext->isVCLOnly() )
-            break;
-        pContext = pContext->mpPrevContext;
-    }
-    rtl::Reference<OpenGLContext> xContext;
-    vcl::Window* pDefWindow = !pContext && bMakeIfNecessary ? ImplGetDefaultWindow() : nullptr;
-    if (pDefWindow)
-    {
-        // create our magic fallback window context.
-#if HAVE_FEATURE_OPENGL
-        xContext = pDefWindow->GetGraphics()->GetOpenGLContext();
-        assert(xContext.is());
-#endif
-    }
-    else
-        xContext = pContext;
-
-    if( xContext.is() )
-        xContext->makeCurrent();
-
-    return xContext;
-}
-
-/*
- * We don't care what context we have, but we want one that is live,
- * ie. not reset underneath us, and is setup for VCL usage - ideally
- * not swapping context at all.
- */
-void OpenGLContext::makeVCLCurrent()
-{
-    getVCLContext();
-}
-
 void OpenGLContext::registerAsCurrent()
 {
     ImplSVData* pSVData = ImplGetSVData();
@@ -525,9 +439,6 @@ void OpenGLContext::registerAsCurrent()
         pSVData->maGDIData.mpLastContext->mpNextContext = this;
         pSVData->maGDIData.mpLastContext = this;
     }
-
-    // sync the render state with the current context
-    mpRenderState->sync();
 }
 
 void OpenGLContext::resetCurrent()
@@ -584,226 +495,4 @@ const SystemChildWindow* OpenGLContext::getChildWindow() const
     return m_pChildWindow;
 }
 
-void OpenGLContext::BindFramebuffer( OpenGLFramebuffer* pFramebuffer )
-{
-    OpenGLZone aZone;
-
-    if( pFramebuffer != mpCurrentFramebuffer )
-    {
-        if( pFramebuffer )
-            pFramebuffer->Bind();
-        else
-            OpenGLFramebuffer::Unbind();
-        mpCurrentFramebuffer = pFramebuffer;
-    }
-}
-
-void OpenGLContext::AcquireDefaultFramebuffer()
-{
-    BindFramebuffer( nullptr );
-}
-
-OpenGLFramebuffer* OpenGLContext::AcquireFramebuffer( const OpenGLTexture& rTexture )
-{
-    OpenGLZone aZone;
-
-    OpenGLFramebuffer* pFramebuffer = nullptr;
-    OpenGLFramebuffer* pFreeFbo = nullptr;
-    OpenGLFramebuffer* pSameSizeFbo = nullptr;
-
-    // check if there is already a framebuffer attached to that texture
-    pFramebuffer = mpLastFramebuffer;
-    while( pFramebuffer )
-    {
-        if( pFramebuffer->IsAttached( rTexture ) )
-            break;
-        if( !pFreeFbo && pFramebuffer->IsFree() )
-            pFreeFbo = pFramebuffer;
-        if( !pSameSizeFbo &&
-            pFramebuffer->GetWidth() == rTexture.GetWidth() &&
-            pFramebuffer->GetHeight() == rTexture.GetHeight() )
-            pSameSizeFbo = pFramebuffer;
-        pFramebuffer = pFramebuffer->mpPrevFramebuffer;
-    }
-
-    // else use any framebuffer having the same size
-    if( !pFramebuffer && pSameSizeFbo )
-        pFramebuffer = pSameSizeFbo;
-
-    // else use the first free framebuffer
-    if( !pFramebuffer && pFreeFbo )
-        pFramebuffer = pFreeFbo;
-
-    // if there isn't any free one, create a new one if the limit isn't reached
-    if( !pFramebuffer && mnFramebufferCount < MAX_FRAMEBUFFER_COUNT )
-    {
-        mnFramebufferCount++;
-        pFramebuffer = new OpenGLFramebuffer();
-        if( mpLastFramebuffer )
-        {
-            pFramebuffer->mpPrevFramebuffer = mpLastFramebuffer;
-            mpLastFramebuffer = pFramebuffer;
-        }
-        else
-        {
-            mpFirstFramebuffer = pFramebuffer;
-            mpLastFramebuffer = pFramebuffer;
-        }
-    }
-
-    // last try, use any framebuffer
-    // TODO order the list of framebuffers as a LRU
-    if( !pFramebuffer )
-        pFramebuffer = mpFirstFramebuffer;
-
-    assert( pFramebuffer );
-    BindFramebuffer( pFramebuffer );
-    pFramebuffer->AttachTexture( rTexture );
-
-    state().viewport(tools::Rectangle(Point(), Size(rTexture.GetWidth(), rTexture.GetHeight())));
-
-    return pFramebuffer;
-}
-
-// FIXME: this method is rather grim from a perf. perspective.
-// We should instead (eventually) use pointers to associate the
-// framebuffer and texture cleanly.
-void OpenGLContext::UnbindTextureFromFramebuffers( GLuint nTexture )
-{
-    OpenGLFramebuffer* pFramebuffer;
-
-    // see if there is a framebuffer attached to that texture
-    pFramebuffer = mpLastFramebuffer;
-    while( pFramebuffer )
-    {
-        if (pFramebuffer->IsAttached(nTexture))
-        {
-            BindFramebuffer(pFramebuffer);
-            pFramebuffer->DetachTexture();
-        }
-        pFramebuffer = pFramebuffer->mpPrevFramebuffer;
-    }
-
-    // Lets just check that no other context has a framebuffer
-    // with this texture - that would be bad ...
-    assert( !IsTextureAttachedAnywhere( nTexture ) );
-}
-
-/// Method for debugging; check texture is not already attached.
-bool OpenGLContext::IsTextureAttachedAnywhere( GLuint nTexture )
-{
-    ImplSVData* pSVData = ImplGetSVData();
-    for( auto *pCheck = pSVData->maGDIData.mpLastContext; pCheck;
-               pCheck = pCheck->mpPrevContext )
-    {
-        for( auto pBuffer = pCheck->mpLastFramebuffer; pBuffer;
-                  pBuffer = pBuffer->mpPrevFramebuffer )
-        {
-            if( pBuffer->IsAttached( nTexture ) )
-                return true;
-        }
-    }
-    return false;
-}
-
-void OpenGLContext::ReleaseFramebuffer( OpenGLFramebuffer* pFramebuffer )
-{
-    if( pFramebuffer )
-        pFramebuffer->DetachTexture();
-}
-
-void OpenGLContext::ReleaseFramebuffer( const OpenGLTexture& rTexture )
-{
-    OpenGLZone aZone;
-
-    if (!rTexture) // no texture to release.
-        return;
-
-    OpenGLFramebuffer* pFramebuffer = mpLastFramebuffer;
-
-    while( pFramebuffer )
-    {
-        if( pFramebuffer->IsAttached( rTexture ) )
-        {
-            BindFramebuffer( pFramebuffer );
-            pFramebuffer->DetachTexture();
-            if (mpCurrentFramebuffer == pFramebuffer)
-                BindFramebuffer( nullptr );
-        }
-        pFramebuffer = pFramebuffer->mpPrevFramebuffer;
-    }
-}
-
-void OpenGLContext::ReleaseFramebuffers()
-{
-    OpenGLZone aZone;
-
-    OpenGLFramebuffer* pFramebuffer = mpLastFramebuffer;
-    while( pFramebuffer )
-    {
-        if (!pFramebuffer->IsFree())
-        {
-            BindFramebuffer( pFramebuffer );
-            pFramebuffer->DetachTexture();
-        }
-        pFramebuffer = pFramebuffer->mpPrevFramebuffer;
-    }
-    BindFramebuffer( nullptr );
-}
-
-OpenGLProgram* OpenGLContext::GetProgram( const OUString& rVertexShader, const OUString& rFragmentShader, const OString& preamble )
-{
-    OpenGLZone aZone;
-
-    // We cache the shader programs in a per-process run-time cache
-    // based on only the names and the preamble. We don't expect
-    // shader source files to change during the lifetime of a
-    // LibreOffice process.
-    OString aNameBasedKey = OUStringToOString(rVertexShader + "+" + rFragmentShader, RTL_TEXTENCODING_UTF8) + "+" + preamble;
-    if( !aNameBasedKey.isEmpty() )
-    {
-        ProgramCollection::iterator it = maPrograms.find( aNameBasedKey );
-        if( it != maPrograms.end() )
-            return it->second.get();
-    }
-
-    // Binary shader programs are cached persistently (between
-    // LibreOffice process instances) based on a hash of their source
-    // code, as the source code can and will change between
-    // LibreOffice versions even if the shader names don't change.
-    OString aPersistentKey = OpenGLHelper::GetDigest( rVertexShader, rFragmentShader, preamble );
-    std::shared_ptr<OpenGLProgram> pProgram = std::make_shared<OpenGLProgram>();
-    if( !pProgram->Load( rVertexShader, rFragmentShader, preamble, aPersistentKey ) )
-        return nullptr;
-
-    maPrograms.insert(std::make_pair(aNameBasedKey, pProgram));
-    return pProgram.get();
-}
-
-OpenGLProgram* OpenGLContext::UseProgram( const OUString& rVertexShader, const OUString& rFragmentShader, const OString& preamble )
-{
-    OpenGLZone aZone;
-
-    OpenGLProgram* pProgram = GetProgram( rVertexShader, rFragmentShader, preamble );
-
-    if (pProgram && pProgram == mpCurrentProgram)
-    {
-        VCL_GL_INFO("Context::UseProgram: Reusing existing program " << pProgram->Id());
-        pProgram->Reuse();
-        return pProgram;
-    }
-
-    mpCurrentProgram = pProgram;
-
-    if (!mpCurrentProgram)
-    {
-        SAL_WARN("vcl.opengl", "OpenGLContext::UseProgram: mpCurrentProgram is 0");
-        return nullptr;
-    }
-
-    mpCurrentProgram->Use();
-
-    return mpCurrentProgram;
-}
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/source/opengl/OpenGLHelper.cxx b/vcl/source/opengl/OpenGLHelper.cxx
index ef7729914f0d..fce2ac1afb11 100644
--- a/vcl/source/opengl/OpenGLHelper.cxx
+++ b/vcl/source/opengl/OpenGLHelper.cxx
@@ -884,26 +884,6 @@ const CrashWatchdogTimingsValues& OpenGLZone::getCrashWatchdogTimingsValues()
     return gWatchdogTimings.getWatchdogTimingsValues(eMode);
 }
 
-OpenGLVCLContextZone::OpenGLVCLContextZone()
-{
-    OpenGLContext::makeVCLCurrent();
-}
-
-namespace
-{
-    bool bTempOpenGLDisabled = false;
-}
-
-PreDefaultWinNoOpenGLZone::PreDefaultWinNoOpenGLZone()
-{
-    bTempOpenGLDisabled = true;
-}
-
-PreDefaultWinNoOpenGLZone::~PreDefaultWinNoOpenGLZone()
-{
-    bTempOpenGLDisabled = false;
-}
-
 static void reapGlxTest()
 {
     // Reap the glxtest child, or it'll stay around as a zombie,
@@ -938,11 +918,6 @@ bool OpenGLHelper::isVCLOpenGLEnabled()
     if (Application::IsBitmapRendering())
         return false;
 
-    //tdf#106155, disable GL while loading certain bitmaps needed for the initial toplevel windows
-    //under raw X (kde) vclplug
-    if (bTempOpenGLDisabled)
-        return false;
-
     if (bSet)
     {
         return bForceOpenGL || bEnable;