gl_state: Remove blend color tracking

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1117,10 +1117,7 @@ void RasterizerOpenGL::SyncBlendState() {
     auto& maxwell3d = system.GPU().Maxwell3D();
     const auto& regs = maxwell3d.regs;
 
-    state.blend_color.red = regs.blend_color.r;
-    state.blend_color.green = regs.blend_color.g;
-    state.blend_color.blue = regs.blend_color.b;
-    state.blend_color.alpha = regs.blend_color.a;
+    glBlendColor(regs.blend_color.r, regs.blend_color.g, regs.blend_color.b, regs.blend_color.a);
 
     state.independant_blend.enabled = regs.independent_blend_enable;
     if (!state.independant_blend.enabled) {

src/video_core/renderer_opengl/gl_state.cpp

@@ -330,13 +330,6 @@ void OpenGLState::ApplyBlending() {
         ApplyGlobalBlending();
     }
     cur_state.independant_blend.enabled = independant_blend.enabled;
-
-    if (UpdateTie(
-            std::tie(cur_state.blend_color.red, cur_state.blend_color.green,
-                     cur_state.blend_color.blue, cur_state.blend_color.alpha),
-            std::tie(blend_color.red, blend_color.green, blend_color.blue, blend_color.alpha))) {
-        glBlendColor(blend_color.red, blend_color.green, blend_color.blue, blend_color.alpha);
-    }
 }
 
 void OpenGLState::ApplyLogicOp() {

src/video_core/renderer_opengl/gl_state.h

@@ -81,13 +81,6 @@ public:
         bool enabled = false;
     } independant_blend;
 
-    struct {
-        GLclampf red = 0.0f;
-        GLclampf green = 0.0f;
-        GLclampf blue = 0.0f;
-        GLclampf alpha = 0.0f;
-    } blend_color; // GL_BLEND_COLOR
-
     struct {
         bool enabled = false; // GL_LOGIC_OP_MODE
         GLenum operation = GL_COPY;