Fix for alpha blending using gl fixed-functions not matching shader implementation

1 files changed, 23 insertions, 0 deletions

diff --git a/indra/llimage/llimage.cpp b/indra/llimage/llimage.cpp
index 916c346b7a..79949df2d0 100644
--- a/indra/llimage/llimage.cpp
+++ b/indra/llimage/llimage.cpp
@@ -673,6 +673,29 @@ void LLImageRaw::compositeUnscaled4onto3( LLImageRaw* src )
 	}
 }
 
+void LLImageRaw::copyUnscaledAlphaMask( LLImageRaw* src, const LLColor4U& fill)
+{
+	LLImageRaw* dst = this;  // Just for clarity.
+
+	llassert( 1 == src->getComponents() );
+	llassert( 4 == dst->getComponents() );
+	llassert( (src->getWidth() == dst->getWidth()) && (src->getHeight() == dst->getHeight()) );
+
+	S32 pixels = getWidth() * getHeight();
+	U8* src_data = src->getData();
+	U8* dst_data = dst->getData();
+	for ( S32 i = 0; i < pixels; i++ )
+	{
+		dst_data[0] = fill.mV[0];
+		dst_data[1] = fill.mV[1];
+		dst_data[2] = fill.mV[2];
+		dst_data[3] = src_data[0];
+		src_data += 1;
+		dst_data += 4;
+	}
+}
+
+
 // Fill the buffer with a constant color
 void LLImageRaw::fill( const LLColor4U& color )
 {