From f24ab6d9e6c34c6e8946657d71e7b70c3c06e05a Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Mon, 20 Aug 2018 18:43:11 -0500
Subject: GLState: Allow enabling/disabling GL_COLOR_LOGIC_OP independently
 from blending.

---
 src/video_core/renderer_opengl/gl_state.cpp | 20 +++++++++++++++-----
 src/video_core/renderer_opengl/gl_state.h   |  5 ++++-
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/src/video_core/renderer_opengl/gl_state.cpp b/src/video_core/renderer_opengl/gl_state.cpp
index 1d1975179..13399ceb8 100644
--- a/src/video_core/renderer_opengl/gl_state.cpp
+++ b/src/video_core/renderer_opengl/gl_state.cpp
@@ -45,7 +45,8 @@ OpenGLState::OpenGLState() {
     blend.color.blue = 0.0f;
     blend.color.alpha = 0.0f;
 
-    logic_op = GL_COPY;
+    logic_op.enabled = false;
+    logic_op.operation = GL_COPY;
 
     for (auto& texture_unit : texture_units) {
         texture_unit.Reset();
@@ -148,11 +149,10 @@ void OpenGLState::Apply() const {
     // Blending
     if (blend.enabled != cur_state.blend.enabled) {
         if (blend.enabled) {
+            ASSERT(!logic_op.enabled);
             glEnable(GL_BLEND);
-            glDisable(GL_COLOR_LOGIC_OP);
         } else {
             glDisable(GL_BLEND);
-            glEnable(GL_COLOR_LOGIC_OP);
         }
     }
 
@@ -176,8 +176,18 @@ void OpenGLState::Apply() const {
         glBlendEquationSeparate(blend.rgb_equation, blend.a_equation);
     }
 
-    if (logic_op != cur_state.logic_op) {
-        glLogicOp(logic_op);
+    // Logic Operation
+    if (logic_op.enabled != cur_state.logic_op.enabled) {
+        if (logic_op.enabled) {
+            ASSERT(!blend.enabled);
+            glEnable(GL_COLOR_LOGIC_OP);
+        } else {
+            glDisable(GL_COLOR_LOGIC_OP);
+        }
+    }
+
+    if (logic_op.operation != cur_state.logic_op.operation) {
+        glLogicOp(logic_op.operation);
     }
 
     // Textures
diff --git a/src/video_core/renderer_opengl/gl_state.h b/src/video_core/renderer_opengl/gl_state.h
index bdb02ba25..219b65a8a 100644
--- a/src/video_core/renderer_opengl/gl_state.h
+++ b/src/video_core/renderer_opengl/gl_state.h
@@ -83,7 +83,10 @@ public:
         } color; // GL_BLEND_COLOR
     } blend;
 
-    GLenum logic_op; // GL_LOGIC_OP_MODE
+    struct {
+        bool enabled; // GL_LOGIC_OP_MODE
+        GLenum operation;
+    } logic_op;
 
     // 3 texture units - one for each that is used in PICA fragment shader emulation
     struct TextureUnit {
-- 
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