Pre-apply cosmetic changes to mixing

Marlin/src/feature/fwretract.cpp

   set_destination_from_current();
 
   #if ENABLED(RETRACT_SYNC_MIXING)
-    uint8_t old_mixing_tool = mixer.get_current_v_tool();
+    uint8_t old_mixing_tool = mixer.get_current_vtool();
     mixer.T(MIXER_AUTORETRACT_TOOL);
   #endif
 

Marlin/src/feature/mixing.cpp

 #if ENABLED(MIXING_EXTRUDER)
 
 //#define MIXER_NORMALIZER_DEBUG
-#ifdef MIXER_NORMALIZER_DEBUG
-  #include "../core/serial.h"
-#endif
 
 #include "mixing.h"
 
 Mixer mixer;
 
+#ifdef MIXER_NORMALIZER_DEBUG
+  #include "../core/serial.h"
+#endif
+
 // Used up to Planner level
-uint_fast8_t  Mixer::selected_v_tool = 0;
-float         Mixer::M163_collector[MIXING_STEPPERS]; // mix proportion. 0.0 = off, otherwise <= COLOR_A_MASK.
-mixer_color_t Mixer::color[NR_MIXING_VIRTUAL_TOOLS][MIXING_STEPPERS];
+uint_fast8_t Mixer::selected_vtool = 0;
+float        Mixer::collector[MIXING_STEPPERS]; // mix proportion. 0.0 = off, otherwise <= COLOR_A_MASK.
+mixer_comp_t Mixer::color[NR_MIXING_VIRTUAL_TOOLS][MIXING_STEPPERS];
 
 // Used in Stepper
-int_fast8_t   Mixer::runner = 0;
-mixer_color_t Mixer::s_color[MIXING_STEPPERS];
-mixer_accu_t  Mixer::accu[MIXING_STEPPERS] = { 0 };
+int_fast8_t  Mixer::runner = 0;
+mixer_comp_t Mixer::s_color[MIXING_STEPPERS];
+mixer_accu_t Mixer::accu[MIXING_STEPPERS] = { 0 };
 
 void Mixer::normalize(const uint8_t tool_index) {
   float cmax = 0;
     float csum = 0;
   #endif
   MIXER_STEPPER_LOOP(i) {
-    cmax = max(cmax, M163_collector[i]);
+    const float v = collector[i];
+    NOLESS(cmax, v);
     #ifdef MIXER_NORMALIZER_DEBUG
-      csum += M163_collector[i];
+      csum += v;
     #endif
   }
   #ifdef MIXER_NORMALIZER_DEBUG
-    SERIAL_ECHOPGM("Mixer: Relation before normalizing: [ ");
+    SERIAL_ECHOPGM("Mixer: Old relation : [ ");
     MIXER_STEPPER_LOOP(i) {
-      SERIAL_ECHO_F(M163_collector[i] / csum, 3);
+      SERIAL_ECHO_F(collector[i] / csum, 3);
       SERIAL_CHAR(' ');
     }
     SERIAL_ECHOPGM("]\n");
   // Scale all values so their maximum is COLOR_A_MASK
   const float inverse_max = RECIPROCAL(cmax);
   MIXER_STEPPER_LOOP(i)
-    color[tool_index][i] = M163_collector[i] * COLOR_A_MASK * inverse_max;
+    color[tool_index][i] = collector[i] * COLOR_A_MASK * inverse_max;
 
   #ifdef MIXER_NORMALIZER_DEBUG
     csum = 0;
-    SERIAL_ECHOPGM("Mixer: Normalizing to             : [ ");
+    SERIAL_ECHOPGM("Mixer: Normalize to : [ ");
     MIXER_STEPPER_LOOP(i) {
       SERIAL_ECHO(uint16_t(color[tool_index][i]));
       SERIAL_CHAR(' ');
       csum += color[tool_index][i];
     }
     SERIAL_ECHOLNPGM("]");
-    SERIAL_ECHOPGM("Mixer: Relation after normalizing:  [ ");
+    SERIAL_ECHOPGM("Mixer: New relation : [ ");
     MIXER_STEPPER_LOOP(i) {
       SERIAL_ECHO_F(uint16_t(color[tool_index][i]) / csum, 3);
       SERIAL_CHAR(' ');
   #endif
 }
 
-// called at boot
-void Mixer::init( void ) {
+void Mixer::reset_vtools() {
   // Virtual Tools 0, 1, 2, 3 = Filament 1, 2, 3, 4, etc.
   // Every virtual tool gets a pure filament
   for (uint8_t t = 0; t < MIXING_VIRTUAL_TOOLS && t < MIXING_STEPPERS; t++)
       color[t][i] = (t == i) ? COLOR_A_MASK : 0;
 
   // Remaining virtual tools are 100% filament 1
-  #if MIXING_STEPPERS < MIXING_VIRTUAL_TOOLS
+  #if MIXING_VIRTUAL_TOOLS > MIXING_STEPPERS
     for (uint8_t t = MIXING_STEPPERS; t < MIXING_VIRTUAL_TOOLS; t++)
       MIXER_STEPPER_LOOP(i)
         color[t][i] = (i == 0) ? COLOR_A_MASK : 0;
   #endif
+}
+
+// called at boot
+void Mixer::init() {
+
+  reset_vtools();
 
   #if ENABLED(RETRACT_SYNC_MIXING)
     // AUTORETRACT_TOOL gets the same amount of all filaments
       color[MIXER_AUTORETRACT_TOOL][i] = COLOR_A_MASK;
   #endif
 
-  ZERO(M163_collector);
+  ZERO(collector);
 }
 
 #endif // MIXING_EXTRUDER

Marlin/src/feature/mixing.h

 
 #ifdef __AVR__
   #define MIXER_ACCU_SIGNED
-  typedef uint8_t mixer_color_t;
+  typedef uint8_t mixer_comp_t;
   typedef int8_t mixer_accu_t;
   #define COLOR_A_MASK 0x80
   #define COLOR_MASK 0x7F
 #else
-  typedef uint_fast16_t mixer_color_t;
+  typedef uint_fast16_t mixer_comp_t;
   typedef uint_fast16_t mixer_accu_t;
   #define COLOR_A_MASK 0x8000
   #define COLOR_MASK 0x7FFF
 #define MIXER_STEPPER_LOOP(VAR) \
   for (uint_fast8_t VAR = 0; VAR < MIXING_STEPPERS; VAR++)
 
-#define MIXER_BLOCK_DEFINITION mixer_color_t b_color[MIXING_STEPPERS]
+#define MIXER_BLOCK_FIELD      mixer_comp_t b_color[MIXING_STEPPERS]
 #define MIXER_POPULATE_BLOCK() mixer.populate_block(block->b_color)
-#define MIXER_STEPPER_SETUP() mixer.stepper_setup(current_block->b_color)
+#define MIXER_STEPPER_SETUP()  mixer.stepper_setup(current_block->b_color)
 
+/**
+ * @brief Mixer class
+ * @details Contains data and behaviors for a Mixing Extruder
+ */
 class Mixer {
   public:
 
-  static void init(void); // Populate colors at boot time
+  static void init();
+
+  static void reset_vtools();
 
   // Used up to Planner level
   static void normalize(const uint8_t tool_index);
-  FORCE_INLINE static uint8_t get_current_v_tool(void) { return selected_v_tool; }
-  FORCE_INLINE static void T(const uint_fast8_t c) { selected_v_tool = c; }
-  FORCE_INLINE static void set_M163_collector(const uint8_t c, const float f) { M163_collector[c] = f; }
+  FORCE_INLINE static uint8_t get_current_vtool() { return selected_vtool; }
+  FORCE_INLINE static void T(const uint_fast8_t c) { selected_vtool = c; }
+  FORCE_INLINE static void set_collector(const uint8_t c, const float f) { collector[c] = f; }
 
   // Used when dealing with blocks
-  FORCE_INLINE static void populate_block(mixer_color_t b_color[]) {
-    uint_fast8_t j = get_current_v_tool();
+  FORCE_INLINE static void populate_block(mixer_comp_t b_color[]) {
+    uint_fast8_t j = get_current_vtool();
     MIXER_STEPPER_LOOP(i) b_color[i] = color[j][i];
   }
-  FORCE_INLINE static void stepper_setup(mixer_color_t b_color[]) { MIXER_STEPPER_LOOP(i) s_color[i] = b_color[i]; }
+  FORCE_INLINE static void stepper_setup(mixer_comp_t b_color[]) { MIXER_STEPPER_LOOP(i) s_color[i] = b_color[i]; }
 
   // Used in Stepper
-  FORCE_INLINE static uint8_t get_stepper(void) { return runner; }
-  FORCE_INLINE static uint8_t get_next_stepper(void) {
+  FORCE_INLINE static uint8_t get_stepper() { return runner; }
+  FORCE_INLINE static uint8_t get_next_stepper() {
     do {
       if (--runner < 0) runner = MIXING_STEPPERS - 1;
       accu[runner] += s_color[runner];
   private:
 
   // Used up to Planner level
-  static uint_fast8_t  selected_v_tool;
-  static float         M163_collector[MIXING_STEPPERS];
-  static mixer_color_t color[NR_MIXING_VIRTUAL_TOOLS][MIXING_STEPPERS];
+  static uint_fast8_t selected_vtool;
+  static float        collector[MIXING_STEPPERS];
+  static mixer_comp_t color[NR_MIXING_VIRTUAL_TOOLS][MIXING_STEPPERS];
 
   // Used in Stepper
-  static int_fast8_t   runner;
-  static mixer_color_t s_color[MIXING_STEPPERS];
-  static mixer_accu_t  accu[MIXING_STEPPERS];
+  static int_fast8_t  runner;
+  static mixer_comp_t s_color[MIXING_STEPPERS];
+  static mixer_accu_t accu[MIXING_STEPPERS];
 };
 
 extern Mixer mixer;

Marlin/src/gcode/feature/mixing/M163-M165.cpp

 void GcodeSuite::M163() {
   const int mix_index = parser.intval('S');
   if (mix_index < MIXING_STEPPERS)
-    mixer.set_M163_collector(mix_index, MAX(parser.floatval('P'), 0.0));
+    mixer.set_collector(mix_index, MAX(parser.floatval('P'), 0.0));
 }
 
 /**
   if (WITHIN(tool_index, 0, MIXING_VIRTUAL_TOOLS - 1))
     mixer.normalize(tool_index);
   else
-    mixer.normalize(mixer.get_current_v_tool());
+    mixer.normalize(mixer.get_current_vtool());
 }
 
 #if ENABLED(DIRECT_MIXING_IN_G1)
     MIXER_STEPPER_LOOP(i) {
       if (parser.seenval(mixing_codes[i])) {
         SBI(mix_bits, i);
-        mixer.set_M163_collector(i, MAX(parser.value_float(), 0.0f));
+        mixer.set_collector(i, MAX(parser.value_float(), 0.0f));
       }
     }
     // If any mixing factors were included, clear the rest
     // If none were included, preserve the last mix
     if (mix_bits) {
       MIXER_STEPPER_LOOP(i)
-        if (!TEST(mix_bits, i)) mixer.set_M163_collector(i, 0.0f);
-      mixer.normalize(mixer.get_current_v_tool());
+        if (!TEST(mix_bits, i)) mixer.set_collector(i, 0.0f);
+      mixer.normalize(mixer.get_current_vtool());
     }
   }
 

Marlin/src/module/planner.cpp

       // In worst case, only one extruder running, no change is needed.
       // In best case, all extruders run the same amount, we can divide by MIXING_STEPPERS
       float delta_mm_i = 0;
-      if (i == E_AXIS && mixer.get_current_v_tool() == MIXER_AUTORETRACT_TOOL)
+      if (i == E_AXIS && mixer.get_current_vtool() == MIXER_AUTORETRACT_TOOL)
         delta_mm_i = delta_mm[i] / MIXING_STEPPERS;
       else
         delta_mm_i = delta_mm[i];

Marlin/src/module/planner.h

   #endif
 
   #if ENABLED(MIXING_EXTRUDER)
-    MIXER_BLOCK_DEFINITION;                 // Normalized color for the mixing steppers
+    MIXER_BLOCK_FIELD;                      // Normalized color for the mixing steppers
   #endif
 
   // Settings for the trapezoid generator

Marlin/src/module/tool_change.cpp

     if (tmp_extruder >= MIXING_VIRTUAL_TOOLS)
       return invalid_extruder_error(tmp_extruder);
 
-    #if MIXING_VIRTUAL_TOOLS >  1
+    #if MIXING_VIRTUAL_TOOLS > 1
       // T0-Tnnn: Switch virtual tool by changing the index to the mix
-      mixer.T(uint_fast8_t(tmp_extruder));
+      mixer.T(tmp_extruder);
     #endif
 
   #elif ENABLED(PRUSA_MMU2)
 
     mmu2.toolChange(tmp_extruder);
 
-
   #elif EXTRUDERS < 2
 
     UNUSED(fr_mm_s); UNUSED(no_move);