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Diff Layer Transparancy Fallback for Low Framebuffer Count

This commit is contained in:
Chartreuse 2023-03-20 13:05:24 +00:00 committed by Mike Williams
parent 45b94a4b3e
commit 0d5976c52b
1 changed files with 31 additions and 9 deletions
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40
common/gal/opengl/opengl_gal.cpp
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@ -506,7 +506,15 @@ void OPENGL_GAL::BeginDrawing()
// Prepare rendering target buffers
m_compositor->Initialize();
m_mainBuffer = m_compositor->CreateBuffer();
m_tempBuffer = m_compositor->CreateBuffer();
try
{
m_tempBuffer = m_compositor->CreateBuffer();
}
catch( const std::runtime_error& )
{
wxLogVerbose( "Could not create a framebuffer for diff mode blending.\n" );
m_tempBuffer = 0;
}
try
{
m_overlayBuffer = m_compositor->CreateBuffer();
@ -1957,7 +1965,8 @@ void OPENGL_GAL::ClearTarget( RENDER_TARGET aTarget )
break;
case TARGET_TEMP:
m_compositor->SetBuffer( m_tempBuffer );
if( m_tempBuffer )
m_compositor->SetBuffer( m_tempBuffer );
break;
case TARGET_OVERLAY:
@ -1981,10 +1990,10 @@ bool OPENGL_GAL::HasTarget( RENDER_TARGET aTarget )
switch( aTarget )
{
default:
case TARGET_TEMP:
case TARGET_CACHED:
case TARGET_NONCACHED: return true;
case TARGET_OVERLAY: return ( m_overlayBuffer != 0 );
case TARGET_TEMP: return ( m_tempBuffer != 0 );
}
}
@ -1992,18 +2001,31 @@ bool OPENGL_GAL::HasTarget( RENDER_TARGET aTarget )
void OPENGL_GAL::StartDiffLayer()
{
m_currentManager->EndDrawing();
SetTarget( TARGET_TEMP );
ClearTarget( TARGET_TEMP );
if( m_tempBuffer )
{
SetTarget( TARGET_TEMP );
ClearTarget( TARGET_TEMP );
}
}
void OPENGL_GAL::EndDiffLayer()
{
glBlendEquation( GL_MAX );
m_currentManager->EndDrawing();
glBlendEquation( GL_FUNC_ADD );
if( m_tempBuffer )
{
glBlendEquation( GL_MAX );
m_currentManager->EndDrawing();
glBlendEquation( GL_FUNC_ADD );
m_compositor->DrawBuffer( m_tempBuffer, m_mainBuffer );
m_compositor->DrawBuffer( m_tempBuffer, m_mainBuffer );
}
else
{
// Fall back to imperfect alpha blending on single buffer
glBlendFunc( GL_SRC_ALPHA, GL_ONE );
m_currentManager->EndDrawing();
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
}
}