AGI: Set the correct palette to use for each Amiga game

The Amiga palettes were added in 16529e58e6, but were never used.
A new game-specific option has been added for the old Amiga palette

3 files changed, 28 insertions, 3 deletions

diff --git a/engines/agi/agi.cpp b/engines/agi/agi.cpp
index 6bdbabd33e..73233d4f4c 100644
--- a/engines/agi/agi.cpp
+++ b/engines/agi/agi.cpp
@@ -500,6 +500,7 @@ static const GameSettings agiSettings[] = {
 AgiBase::AgiBase(OSystem *syst, const AGIGameDescription *gameDesc) : Engine(syst), _gameDescription(gameDesc) {
 	// Assign default values to the config manager, in case settings are missing
 	ConfMan.registerDefault("originalsaveload", "false");
+	ConfMan.registerDefault("altamigapalette", "false");
 
 	_noSaveLoadAllowed = false;
 
diff --git a/engines/agi/detection.cpp b/engines/agi/detection.cpp
index 1d58900056..e7285d8112 100644
--- a/engines/agi/detection.cpp
+++ b/engines/agi/detection.cpp
@@ -145,6 +145,13 @@ static const ExtraGuiOption agiExtraGuiOption = {
 	false
 };
 
+static const ExtraGuiOption agiExtraGuiOptionAmiga = {
+	_s("Use an alternative palette"),
+	_s("Use an alternative palette, common for all Amiga games. This was the old behavior"),
+	"altamigapalette",
+	false
+};
+
 #include "agi/detection_tables.h"
 
 using namespace Agi;
@@ -230,6 +237,8 @@ bool AgiMetaEngine::createInstance(OSystem *syst, Engine **engine, const ADGameD
 const ExtraGuiOptions AgiMetaEngine::getExtraGuiOptions(const Common::String &target) const {
 	ExtraGuiOptions options;
 	options.push_back(agiExtraGuiOption);
+	if (target.contains("-amiga"))
+		options.push_back(agiExtraGuiOptionAmiga);
 	return options;
 }
 
diff --git a/engines/agi/graphics.cpp b/engines/agi/graphics.cpp
index 34651c70b2..317e747cdd 100644
--- a/engines/agi/graphics.cpp
+++ b/engines/agi/graphics.cpp
@@ -20,6 +20,7 @@
  *
  */
 
+#include "common/config-manager.h"
 #include "common/file.h"
 #include "common/textconsole.h"
 
@@ -220,7 +221,7 @@ static const uint8 amigaAgiPaletteV3[16 * 3] = {
 /**
  * 16 color amiga-ish palette.
  */
-static const uint8 newPalette[16 * 3] = {
+static const uint8 altAmigaPalette[16 * 3] = {
 	0x00, 0x00, 0x00,
 	0x00, 0x00, 0x3f,
 	0x00, 0x2A, 0x00,
@@ -1030,8 +1031,22 @@ int GfxMgr::initVideo() {
 		initPalette(vgaPalette, 256, 8);
 	else if (_vm->_renderMode == Common::kRenderEGA)
 		initPalette(egaPalette);
-	else
-		initPalette(newPalette);
+	else if (_vm->_renderMode == Common::kRenderAmiga) {
+		if (!ConfMan.getBool("altamigapalette")) {
+			// Set the correct Amiga palette
+			if (_vm->getVersion() < 0x2936)
+				// TODO: This palette isn't used for Apple IIGS games yet, as
+				// we don't set a separate render mode for them yet
+				initPalette(amigaAgiPaletteV1, 16, 4);
+			else if (_vm->getVersion() == 0x2936)
+				initPalette(amigaAgiPaletteV2, 16, 4);
+			else if (_vm->getVersion() > 0x2936)
+				initPalette(amigaAgiPaletteV3, 16, 4);
+		} else
+			// Set the old common alternative Amiga palette
+			initPalette(altAmigaPalette);
+	} else
+		error("initVideo: Unhandled render mode");
 
 	if ((_agiScreen = (uint8 *)calloc(GFX_WIDTH, GFX_HEIGHT)) == NULL)
 		return errNotEnoughMemory;