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Do not write alpha to the main framebuffer when performing antialiasing. 

This allows correct background display when the main framebuffer has alpha.
Noticeable on Wayland with Mesa 24.0.2 Iris driver.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/17341

(cherry picked from commit bf6ff5b805)
This commit is contained in:
Alex Shvartzkop 2024-03-12 08:00:28 +03:00
parent 6df17bba99
commit 50dd6185bb
2 changed files with 9 additions and 1 deletions
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8
common/gal/opengl/antialiasing.cpp
View File

@ -185,7 +185,11 @@ void ANTIALIASING_SUPERSAMPLING::Present()
glBindTexture( GL_TEXTURE_2D, compositor->GetBufferTexture( ssaaMainBuffer ) );
compositor->SetBuffer( OPENGL_COMPOSITOR::DIRECT_RENDERING );
glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE );
draw_fullscreen_primitive();
glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
}
@ -547,7 +551,11 @@ void ANTIALIASING_SMAA::Present()
glActiveTexture( GL_TEXTURE1 );
glBindTexture( GL_TEXTURE_2D, blendTex );
glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE );
pass_3_shader->Use();
draw_fullscreen_triangle();
pass_3_shader->Deactivate();
glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
}

2
common/gal/opengl/opengl_compositor.cpp
View File

@ -297,7 +297,7 @@ void OPENGL_COMPOSITOR::ClearBuffer( const COLOR4D& aColor )
{
wxASSERT( m_initialized );
glClearColor( aColor.r, aColor.g, aColor.b, 0.0f );
glClearColor( aColor.r, aColor.g, aColor.b, m_curFbo == DIRECT_RENDERING ? 1.0f : 0.0f );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );
}