Videocore: Don't reinitialize register name map on every query

This greatly speeds up the command list debug widget.

src/video_core/pica.cpp

@@ -2,7 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <string.h>
+#include <cstring>
+#include <unordered_map>
 
 #include "pica.h"
 
@@ -10,6 +11,75 @@ namespace Pica {
 
 State g_state;
 
+std::string Regs::GetCommandName(int index) {
+    static std::unordered_map<u32, std::string> map;
+
+    if (map.empty()) {
+        #define ADD_FIELD(name) \
+                map.insert({static_cast<u32>(PICA_REG_INDEX(name)), #name}); \
+                /* TODO: change to Regs::name when VS2015 and other compilers support it  */ \
+                for (u32 i = PICA_REG_INDEX(name) + 1; i < PICA_REG_INDEX(name) + sizeof(Regs().name) / 4; ++i) \
+                    map.insert({i, #name + std::string("+") + std::to_string(i-PICA_REG_INDEX(name))}); \
+
+        ADD_FIELD(trigger_irq);
+        ADD_FIELD(cull_mode);
+        ADD_FIELD(viewport_size_x);
+        ADD_FIELD(viewport_size_y);
+        ADD_FIELD(viewport_depth_range);
+        ADD_FIELD(viewport_depth_far_plane);
+        ADD_FIELD(viewport_corner);
+        ADD_FIELD(texture0_enable);
+        ADD_FIELD(texture0);
+        ADD_FIELD(texture0_format);
+        ADD_FIELD(texture1);
+        ADD_FIELD(texture1_format);
+        ADD_FIELD(texture2);
+        ADD_FIELD(texture2_format);
+        ADD_FIELD(tev_stage0);
+        ADD_FIELD(tev_stage1);
+        ADD_FIELD(tev_stage2);
+        ADD_FIELD(tev_stage3);
+        ADD_FIELD(tev_combiner_buffer_input);
+        ADD_FIELD(tev_stage4);
+        ADD_FIELD(tev_stage5);
+        ADD_FIELD(tev_combiner_buffer_color);
+        ADD_FIELD(output_merger);
+        ADD_FIELD(framebuffer);
+        ADD_FIELD(vertex_attributes);
+        ADD_FIELD(index_array);
+        ADD_FIELD(num_vertices);
+        ADD_FIELD(trigger_draw);
+        ADD_FIELD(trigger_draw_indexed);
+        ADD_FIELD(vs_default_attributes_setup);
+        ADD_FIELD(command_buffer);
+        ADD_FIELD(triangle_topology);
+        ADD_FIELD(gs.bool_uniforms);
+        ADD_FIELD(gs.int_uniforms);
+        ADD_FIELD(gs.main_offset);
+        ADD_FIELD(gs.input_register_map);
+        ADD_FIELD(gs.uniform_setup);
+        ADD_FIELD(gs.program);
+        ADD_FIELD(gs.swizzle_patterns);
+        ADD_FIELD(vs.bool_uniforms);
+        ADD_FIELD(vs.int_uniforms);
+        ADD_FIELD(vs.main_offset);
+        ADD_FIELD(vs.input_register_map);
+        ADD_FIELD(vs.uniform_setup);
+        ADD_FIELD(vs.program);
+        ADD_FIELD(vs.swizzle_patterns);
+
+#undef ADD_FIELD
+    }
+
+    // Return empty string if no match is found
+    auto it = map.find(index);
+    if (it != map.end()) {
+        return it->second;
+    } else {
+        return std::string();
+    }
+}
+
 void Init() {
 }
 

src/video_core/pica.h

@@ -7,7 +7,6 @@
 #include <array>
 #include <cmath>
 #include <cstddef>
-#include <map>
 #include <string>
 
 #include "common/assert.h"
@@ -908,69 +907,7 @@ struct Regs {
 
     // Map register indices to names readable by humans
     // Used for debugging purposes, so performance is not an issue here
-    static std::string GetCommandName(int index) {
-        std::map<u32, std::string> map;
-
-        #define ADD_FIELD(name)                                                                               \
-            do {                                                                                              \
-                map.insert({static_cast<u32>(PICA_REG_INDEX(name)), #name});                                                    \
-                /* TODO: change to Regs::name when VS2015 and other compilers support it  */                   \
-                for (u32 i = PICA_REG_INDEX(name) + 1; i < PICA_REG_INDEX(name) + sizeof(Regs().name) / 4; ++i) \
-                    map.insert({i, #name + std::string("+") + std::to_string(i-PICA_REG_INDEX(name))});       \
-            } while(false)
-
-        ADD_FIELD(trigger_irq);
-        ADD_FIELD(cull_mode);
-        ADD_FIELD(viewport_size_x);
-        ADD_FIELD(viewport_size_y);
-        ADD_FIELD(viewport_depth_range);
-        ADD_FIELD(viewport_depth_far_plane);
-        ADD_FIELD(viewport_corner);
-        ADD_FIELD(texture0_enable);
-        ADD_FIELD(texture0);
-        ADD_FIELD(texture0_format);
-        ADD_FIELD(texture1);
-        ADD_FIELD(texture1_format);
-        ADD_FIELD(texture2);
-        ADD_FIELD(texture2_format);
-        ADD_FIELD(tev_stage0);
-        ADD_FIELD(tev_stage1);
-        ADD_FIELD(tev_stage2);
-        ADD_FIELD(tev_stage3);
-        ADD_FIELD(tev_combiner_buffer_input);
-        ADD_FIELD(tev_stage4);
-        ADD_FIELD(tev_stage5);
-        ADD_FIELD(tev_combiner_buffer_color);
-        ADD_FIELD(output_merger);
-        ADD_FIELD(framebuffer);
-        ADD_FIELD(vertex_attributes);
-        ADD_FIELD(index_array);
-        ADD_FIELD(num_vertices);
-        ADD_FIELD(trigger_draw);
-        ADD_FIELD(trigger_draw_indexed);
-        ADD_FIELD(vs_default_attributes_setup);
-        ADD_FIELD(command_buffer);
-        ADD_FIELD(triangle_topology);
-        ADD_FIELD(gs.bool_uniforms);
-        ADD_FIELD(gs.int_uniforms);
-        ADD_FIELD(gs.main_offset);
-        ADD_FIELD(gs.input_register_map);
-        ADD_FIELD(gs.uniform_setup);
-        ADD_FIELD(gs.program);
-        ADD_FIELD(gs.swizzle_patterns);
-        ADD_FIELD(vs.bool_uniforms);
-        ADD_FIELD(vs.int_uniforms);
-        ADD_FIELD(vs.main_offset);
-        ADD_FIELD(vs.input_register_map);
-        ADD_FIELD(vs.uniform_setup);
-        ADD_FIELD(vs.program);
-        ADD_FIELD(vs.swizzle_patterns);
-
-        #undef ADD_FIELD
-
-        // Return empty string if no match is found
-        return map[index];
-    }
+    static std::string GetCommandName(int index);
 
     static inline size_t NumIds() {
         return sizeof(Regs) / sizeof(u32);