From 0b628784bd9a65322fc6c04be41267310f497dea Mon Sep 17 00:00:00 2001
From: Paul Gilbert
Date: Sun, 14 Apr 2019 21:26:02 -0700
Subject: GLK: GLULXE: Added gestalt methods

---
 engines/glk/glulxe/gestalt.cpp    | 101 ++++++++++++++++++++++++++++++++++++++
 engines/glk/glulxe/glulxe_types.h |  15 ++++++
 engines/glk/module.mk             |   1 +
 3 files changed, 117 insertions(+)
 create mode 100644 engines/glk/glulxe/gestalt.cpp

diff --git a/engines/glk/glulxe/gestalt.cpp b/engines/glk/glulxe/gestalt.cpp
new file mode 100644
index 0000000000..2839c52676
--- /dev/null
+++ b/engines/glk/glulxe/gestalt.cpp
@@ -0,0 +1,101 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "engines/glk/glulxe/glulxe.h"
+
+namespace Glk {
+namespace Glulxe {
+
+uint Glulxe::do_gestalt(uint val, uint val2) {
+  switch (val) {
+
+  case gestulx_GlulxVersion:
+    return 0x00030102; /* Glulx spec version 3.1.2 */
+
+  case gestulx_TerpVersion:
+    return 0x00000504; /* Glulxe version 0.5.4 */
+
+  case gestulx_ResizeMem:
+#ifdef FIXED_MEMSIZE
+    return 0; /* The setmemsize opcodes are compiled out. */
+#else /* FIXED_MEMSIZE */
+    return 1; /* We can handle setmemsize. */
+#endif /* FIXED_MEMSIZE */
+
+  case gestulx_Undo:
+    return 1; /* We can handle saveundo and restoreundo. */
+
+  case gestulx_IOSystem:
+    switch (val2) {
+    case 0:
+      return 1; /* The "null" system always works. */
+    case 1:
+      return 1; /* The "filter" system always works. */
+    case 2:
+      return 1; /* A Glk library is hooked up. */
+    default:
+      return 0;
+    }
+
+  case gestulx_Unicode:
+    return 1; /* We can handle Unicode. */
+
+  case gestulx_MemCopy:
+    return 1; /* We can do mcopy/mzero. */
+
+  case gestulx_MAlloc:
+#ifdef FIXED_MEMSIZE
+    return 0; /* The malloc opcodes are compiled out. */
+#else /* FIXED_MEMSIZE */
+    return 1; /* We can handle malloc/mfree. */
+#endif /* FIXED_MEMSIZE */
+
+  case gestulx_MAllocHeap:
+    return heap_get_start();
+
+  case gestulx_Acceleration:
+    return 1; /* We can do accelfunc/accelparam. */
+
+  case gestulx_AccelFunc:
+    if (accel_find_func(val2))
+      return 1; /* We know this accelerated function. */
+    return 0;
+
+  case gestulx_Float:
+#ifdef FLOAT_SUPPORT
+    return 1; /* We can do floating-point operations. */
+#else /* FLOAT_SUPPORT */
+    return 0; /* The floating-point opcodes are not compiled in. */
+#endif /* FLOAT_SUPPORT */
+
+#ifdef GLULX_EXTEND_GESTALT
+  GLULX_EXTEND_GESTALT
+#endif /* GLULX_EXTEND_GESTALT */
+
+  default:
+    return 0;
+
+  }
+}
+
+} // End of namespace Glulxe
+} // End of namespace Glk
diff --git a/engines/glk/glulxe/glulxe_types.h b/engines/glk/glulxe/glulxe_types.h
index b4c9a14569..c6ce238460 100644
--- a/engines/glk/glulxe/glulxe_types.h
+++ b/engines/glk/glulxe/glulxe_types.h
@@ -250,6 +250,21 @@ enum Opcode {
 	op_jisinf       = 0x1C9
 };
 
+enum gestulx {
+	gestulx_GlulxVersion = 0,
+	gestulx_TerpVersion  = 1,
+	gestulx_ResizeMem    = 2,
+	gestulx_Undo         = 3,
+	gestulx_IOSystem     = 4,
+	gestulx_Unicode      = 5,
+	gestulx_MemCopy      = 6,
+	gestulx_MAlloc       = 7,
+	gestulx_MAllocHeap   = 8,
+	gestulx_Acceleration = 9,
+	gestulx_AccelFunc    = 10,
+	gestulx_Float        = 11
+};
+
 struct dispatch_splot_struct {
 	int numwanted;
 	int maxargs;
diff --git a/engines/glk/module.mk b/engines/glk/module.mk
index 1f026b2a18..f1dcd84d72 100644
--- a/engines/glk/module.mk
+++ b/engines/glk/module.mk
@@ -62,6 +62,7 @@ MODULE_OBJS := \
 	glulxe/exec.o \
 	glulxe/float.o \
 	glulxe/funcs.o \
+	glulxe/gestalt.o \
 	glulxe/glkop.o \
 	glulxe/glulxe.o \
 	magnetic/detection.o \
-- 
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