From ef7f6eb67de9d05522b05ac520ef3184250fcbd4 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Fri, 21 Feb 2020 03:29:24 -0300
Subject: [PATCH] renderer_opengl: Fix edge-case where alpha testing might cull
 presentation

---
 src/video_core/renderer_opengl/gl_state_tracker.h  | 5 +++++
 src/video_core/renderer_opengl/renderer_opengl.cpp | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/src/video_core/renderer_opengl/gl_state_tracker.h b/src/video_core/renderer_opengl/gl_state_tracker.h
index 38b38c4a7e..e084829111 100644
--- a/src/video_core/renderer_opengl/gl_state_tracker.h
+++ b/src/video_core/renderer_opengl/gl_state_tracker.h
@@ -190,6 +190,11 @@ public:
         flags[OpenGL::Dirty::ClipControl] = true;
     }
 
+    void NotifyAlphaTest() {
+        auto& flags = system.GPU().Maxwell3D().dirty.flags;
+        flags[OpenGL::Dirty::AlphaTest] = true;
+    }
+
 private:
     Core::System& system;
 
diff --git a/src/video_core/renderer_opengl/renderer_opengl.cpp b/src/video_core/renderer_opengl/renderer_opengl.cpp
index 7b4c2b80c7..a51410660d 100644
--- a/src/video_core/renderer_opengl/renderer_opengl.cpp
+++ b/src/video_core/renderer_opengl/renderer_opengl.cpp
@@ -591,6 +591,7 @@ void RendererOpenGL::DrawScreen(const Layout::FramebufferLayout& layout) {
     state_tracker.NotifyFramebufferSRGB();
     state_tracker.NotifyLogicOp();
     state_tracker.NotifyClipControl();
+    state_tracker.NotifyAlphaTest();
 
     program_manager.UseVertexShader(vertex_program.handle);
     program_manager.UseGeometryShader(0);
@@ -608,6 +609,7 @@ void RendererOpenGL::DrawScreen(const Layout::FramebufferLayout& layout) {
     glDisable(GL_STENCIL_TEST);
     glDisable(GL_POLYGON_OFFSET_FILL);
     glDisable(GL_RASTERIZER_DISCARD);
+    glDisable(GL_ALPHA_TEST);
     glDisablei(GL_BLEND, 0);
     glDisablei(GL_SCISSOR_TEST, 0);
     glCullFace(GL_BACK);