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authorColin Snover2017-02-03 23:04:53 -0600
committerColin Snover2017-04-22 13:01:35 -0500
commit4c0f2a37384df0ba14f55f223f47a26f208d0199 (patch)
tree0683d1595f3be759ad35686bbf577c3fd410014b /engines/sci
parentc8486395fab2d34b688c47a941a8a0c79cf164d1 (diff)
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SCI: Move ScummVM kernel calls to 0xe0
Diffstat (limited to 'engines/sci')
-rw-r--r--engines/sci/engine/guest_additions.cpp8
-rw-r--r--engines/sci/engine/kernel.cpp31
-rw-r--r--engines/sci/engine/kernel.h5
-rw-r--r--engines/sci/engine/kernel_tables.h4
-rw-r--r--engines/sci/engine/script_patches.cpp12
5 files changed, 43 insertions, 17 deletions
diff --git a/engines/sci/engine/guest_additions.cpp b/engines/sci/engine/guest_additions.cpp
index 6477e3284b..8ac780ac17 100644
--- a/engines/sci/engine/guest_additions.cpp
+++ b/engines/sci/engine/guest_additions.cpp
@@ -315,10 +315,10 @@ void GuestAdditions::patchGameSaveRestoreSCI16() const {
#ifdef ENABLE_SCI32
static const byte SRDialogPatch[] = {
- 0x76, // push0
- 0x59, 0x00, // &rest 0
- 0x43, 0x57, 0x00, 0x00, // callk kScummVMSaveLoad, 0
- 0x48 // ret
+ 0x76, // push0
+ 0x59, 0x01, // &rest 1
+ 0x43, kScummVMSaveLoadId, 0x00, 0x00, // callk kScummVMSaveLoad, 0
+ 0x48 // ret
};
void GuestAdditions::patchGameSaveRestoreSCI32(Script &script) const {
diff --git a/engines/sci/engine/kernel.cpp b/engines/sci/engine/kernel.cpp
index 13a836ab77..68a09e9935 100644
--- a/engines/sci/engine/kernel.cpp
+++ b/engines/sci/engine/kernel.cpp
@@ -905,11 +905,6 @@ void Kernel::loadKernelNames(GameFeatures *features) {
} else {
// Normal SCI2.1 kernel table
_kernelNames = Common::StringArray(sci21_default_knames, kKernelEntriesSci21);
-
- // Used by script patcher to remove CPU spinning on kGetTime
- if (g_sci->getGameId() == GID_HOYLE5) {
- _kernelNames[0x4f] = "Wait";
- }
}
break;
@@ -936,6 +931,32 @@ void Kernel::loadKernelNames(GameFeatures *features) {
break;
}
+#ifdef ENABLE_SCI32
+ // Reserve a high range of kernel call IDs (0xe0 to 0xef) that can be used
+ // by ScummVM to improve integration and fix bugs in games that require
+ // more help than can be provided by a simple script patch (e.g. spinloops
+ // in Hoyle5).
+ // Using a new high range instead of just replacing dummied kernel calls in
+ // the normal kernel range is intended to avoid any conflicts with fangames
+ // that might try to add their own kernel calls in the same manner. It also
+ // helps to separate ScummVM interpreter's kernel calls from SSCI's standard
+ // kernel calls.
+ if (getSciVersion() >= SCI_VERSION_2) {
+ const uint kernelListSize = _kernelNames.size();
+ _kernelNames.resize(0xe2);
+ for (uint id = kernelListSize; id < 0xe0; ++id) {
+ _kernelNames[id] = "Dummy";
+ }
+
+ // Used by Hoyle5 script patches to remove CPU spinning on kGetTime
+ // (this repurposes the existing SCI16 kWait call that was removed in SCI32)
+ _kernelNames[kScummVMWaitId] = "Wait";
+
+ // Used by GuestAdditions to support integrated save/load dialogue
+ _kernelNames[kScummVMSaveLoadId] = "ScummVMSaveLoad";
+ }
+#endif
+
mapFunctions();
}
diff --git a/engines/sci/engine/kernel.h b/engines/sci/engine/kernel.h
index e5b84dd089..2b61a9e0d9 100644
--- a/engines/sci/engine/kernel.h
+++ b/engines/sci/engine/kernel.h
@@ -98,6 +98,11 @@ struct SciWorkaroundEntry; // from workarounds.h
// ---- Kernel signatures -----------------------------------------------------
+enum {
+ kScummVMWaitId = 0xe0,
+ kScummVMSaveLoadId = 0xe1
+};
+
// internal kernel signature data
enum {
SIG_TYPE_NULL = 0x01, // may be 0:0 [0]
diff --git a/engines/sci/engine/kernel_tables.h b/engines/sci/engine/kernel_tables.h
index 5dbd5a5f46..f075da3005 100644
--- a/engines/sci/engine/kernel_tables.h
+++ b/engines/sci/engine/kernel_tables.h
@@ -1264,7 +1264,7 @@ static const char *const sci2_default_knames[] = {
/*0x54*/ "Dummy",
/*0x55*/ "DeleteKey",
/*0x56*/ "Dummy",
- /*0x57*/ "ScummVMSaveLoad", // Dummy in SSCI
+ /*0x57*/ "Dummy",
/*0x58*/ "ListAt",
/*0x59*/ "ListIndexOf",
/*0x5a*/ "ListEachElementDo",
@@ -1428,7 +1428,7 @@ static const char *const sci21_default_knames[] = {
/*0x54*/ "HaveMouse",
/*0x55*/ "SetCursor",
/*0x56*/ "VibrateMouse", // Dummy in SCI3
- /*0x57*/ "ScummVMSaveLoad", // Dummy in SSCI
+ /*0x57*/ "Dummy",
/*0x58*/ "Dummy",
/*0x59*/ "Dummy",
/*0x5a*/ "List",
diff --git a/engines/sci/engine/script_patches.cpp b/engines/sci/engine/script_patches.cpp
index 97e53a0742..82a10d5e31 100644
--- a/engines/sci/engine/script_patches.cpp
+++ b/engines/sci/engine/script_patches.cpp
@@ -704,8 +704,8 @@ static const SciScriptPatcherEntry freddypharkasSignatures[] = {
// Several scripts in Hoyle5 contain a subroutine which spins on kGetTime until
// a certain number of ticks elapse. Since this wastes CPU and makes ScummVM
// unresponsive, the kWait kernel function (which was removed in SCI2) is
-// reintroduced at 0x4f in kernel.cpp only for Hoyle5, and the spin subroutines
-// are patched here to call that function instead.
+// reintroduced for Hoyle5, and the spin subroutines are patched here to call
+// that function instead.
// Applies to at least: English Demo
static const uint16 hoyle5SignatureSpinLoop[] = {
SIG_MAGICDWORD,
@@ -719,10 +719,10 @@ static const uint16 hoyle5SignatureSpinLoop[] = {
};
static const uint16 hoyle5PatchSpinLoop[] = {
- 0x78, // push1
- 0x8f, 0x01, // lsp param[1]
- 0x43, 0x4f, PATCH_UINT16(0x02), // callk Wait, $2
- 0x48, // ret
+ 0x78, // push1
+ 0x8f, 0x01, // lsp param[1]
+ 0x43, kScummVMWaitId, PATCH_UINT16(0x02), // callk Wait, $2
+ 0x48, // ret
PATCH_END
};