[Platform] [PC-98] Hardware palette setters

Optimally, these are called *at most* once per frame. No need to
micro-optimize here.

Part of P0232, funded by [Anonymous].

Makefile.mak

@@ -56,7 +56,7 @@ th05:: $(TH05:\=bin\th05\)
 .obj.com:
 	tlink /t /3 $**
 
-bin\Pipeline\grzview.com: Pipeline\grzview.cpp th01\formats\grz.cpp bin\th01\f_imgd.obj
+bin\Pipeline\grzview.com: Pipeline\grzview.cpp th01\formats\grz.cpp bin\th01\f_imgd.obj platform\x86real\pc98\palette.cpp
 	$(CC) $(CFLAGS) -Z -DGAME=1 -mt -lt -nbin\Pipeline\ @&&|
 $**
 | masters.lib

Pipeline/grzview.cpp

@@ -5,6 +5,7 @@
 #include "pc98.h"
 #include "planar.h"
 #include "master.hpp"
+#include "platform/x86real/pc98/palette.hpp"
 #include "th01/formats/grz.h"
 
 void grcg_setcolor_rmw(int col)
@@ -17,16 +18,6 @@ void grcg_off_func(void)
 	grcg_off();
 }
 
-void z_palette_set_all_show(const Palette4& pal)
-{
-	for(int i = 0; i < COLOR_COUNT; i++) {
-		outportb(0xA8, i);
-		outportb(0xAA, pal[i].c.g);
-		outportb(0xAC, pal[i].c.r);
-		outportb(0xAE, pal[i].c.b);
-	}
-}
-
 const Palette4 boss8_grz_pal = {
 	0x0, 0x0, 0x0,
 	0x5, 0x5, 0x5,
@@ -71,7 +62,7 @@ int main(int argc, const char **argv)
 	}
 	text_hide();
 	graph_start();
-	z_palette_set_all_show(boss8_grz_pal);
+	palette_show(boss8_grz_pal);
 
 	grx_put(0);
 	dos_getch();

platform/x86real/pc98/palette.cpp

@@ -0,0 +1,20 @@
+#include "platform.h"
+#include "pc98.h"
+#include "x86real.h"
+#include "platform/x86real/pc98/palette.hpp"
+
+void palette_show_single(uint4_t col, const RGB4& c)
+{
+	outportb(0xA8, col);
+	outportb(0xAA, c.c.g);
+	outportb(0xAC, c.c.r);
+	outportb(0xAE, c.c.b);
+}
+
+void palette_show(const Palette4& pal)
+{
+	const RGB4* color = pal.colors;
+	for(int i = 0; i < COLOR_COUNT; i++) {
+		palette_show_single(i, *(color++));
+	}
+}

platform/x86real/pc98/palette.hpp

@@ -0,0 +1,8 @@
+// 16-color VRAM palette
+// ---------------------
+
+// Sets the given hardware [col] to the given RGB value.
+void palette_show_single(uint4_t col, const RGB4& c);
+
+// Calls palette_show_single() for all colors in [pal].
+void palette_show(const Palette4& pal);