gl_state_tracker: Implement dirty flags for fragment color clamp

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1149,8 +1149,14 @@ void RasterizerOpenGL::SyncMultiSampleState() {
 }
 
 void RasterizerOpenGL::SyncFragmentColorClampState() {
-    const auto& regs = system.GPU().Maxwell3D().regs;
+    auto& gpu = system.GPU().Maxwell3D();
-    glClampColor(GL_CLAMP_FRAGMENT_COLOR, regs.frag_color_clamp ? GL_TRUE : GL_FALSE);
+    auto& flags = gpu.dirty.flags;
+    if (!flags[Dirty::FragmentClampColor]) {
+        return;
+    }
+    flags[Dirty::FragmentClampColor] = false;
+
+    glClampColor(GL_CLAMP_FRAGMENT_COLOR, gpu.regs.frag_color_clamp ? GL_TRUE : GL_FALSE);
 }
 
 void RasterizerOpenGL::SyncBlendState() {

src/video_core/renderer_opengl/gl_state_tracker.cpp

@@ -201,6 +201,10 @@ void SetupDirtyLogicOp(Tables& tables) {
     FillBlock(tables[0], OFF(logic_op), NUM(logic_op), LogicOp);
 }
 
+void SetupDirtyFragmentClampColor(Tables& tables) {
+    tables[0][OFF(frag_color_clamp)] = FragmentClampColor;
+}
+
 void SetupDirtyMisc(Tables& tables) {
     auto& table = tables[0];
 
@@ -236,6 +240,7 @@ void StateTracker::Initialize() {
     SetupDirtyRasterizeEnable(tables);
     SetupDirtyFramebufferSRGB(tables);
     SetupDirtyLogicOp(tables);
+    SetupDirtyFragmentClampColor(tables);
     SetupDirtyMisc(tables);
 
     auto& store = dirty.on_write_stores;

src/video_core/renderer_opengl/gl_state_tracker.h

@@ -69,6 +69,7 @@ enum : u8 {
     RasterizeEnable,
     FramebufferSRGB,
     LogicOp,
+    FragmentClampColor,
 
     Last
 };