gistfile1.diff

diff --git a/engines/grim/gfx_opengl_shaders.cpp b/engines/grim/gfx_opengl_shaders.cpp
index 728c9e3..f9feaef 100644
--- a/engines/grim/gfx_opengl_shaders.cpp
+++ b/engines/grim/gfx_opengl_shaders.cpp
@@ -727,6 +727,7 @@ void GfxOpenGLS::startActorDraw(const Actor *actor) {
                _actorProgram->setUniform("hasZBuffer", hasZBuffer);
                _actorProgram->setUniform("texcropZBuf", _zBufTexCrop);
                _actorProgram->setUniform("screenSize", Math::Vector2d(_screenWidth, _screenHeight));
+               _actorProgram->setUniform1f("alphaRef", 0.5f);
        }
 
        if (_currentShadowArray) {
diff --git a/engines/grim/shaders/grim_actor.fragment b/engines/grim/shaders/grim_actor.fragment
index 00b78cf..efd78e6 100644
--- a/engines/grim/shaders/grim_actor.fragment
+++ b/engines/grim/shaders/grim_actor.fragment
@@ -7,6 +7,7 @@ uniform bool textured;
 uniform bool hasZBuffer;
 uniform vec2 texcropZBuf;
 uniform vec2 screenSize;
+uniform float alphaRef;
 
 //#define SGSPLUS_FIX
 #ifndef SGSPLUS_FIX
@@ -40,4 +41,7 @@ void main()
        if (textured) {
                outColor *= texture(tex, Texcoord);
        }
+
+       if (outColor.a < alphaRef)
+               discard;
 }