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SCI: Fix for the "Memory fragmented" dialogs popping up in some games.

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svn-id: r43572
This commit is contained in:
Walter van Niftrik 2009-08-20 21:18:52 +00:00
parent 6a3c595b01
commit a7ab084ecf
1 changed files with 19 additions and 6 deletions
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25
engines/sci/engine/kmisc.cpp
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@ -63,14 +63,27 @@ reg_t kHaveMouse(EngineState *s, int funct_nr, int argc, reg_t *argv) {
return make_reg(0, -1);
}
enum kMemoryInfoFunc {
K_MEMORYINFO_LARGEST_HEAP_BLOCK = 0, // Largest heap block available
K_MEMORYINFO_FREE_HEAP = 1, // Total free heap memory
K_MEMORYINFO_LARGEST_HUNK_BLOCK = 2, // Largest available hunk memory block
K_MEMORYINFO_FREE_HUNK = 3, // Amount of free DOS paragraphs
K_MEMORYINFO_TOTAL_HUNK = 4 // Total amount of hunk memory (SCI01)
};
reg_t kMemoryInfo(EngineState *s, int funct_nr, int argc, reg_t *argv) {
uint16 size = 0x7fff; // Must not be 0xffff, or some memory calculations will overflow
switch (argv[0].offset) {
case 0: // Total free heap memory
case 1: // Largest heap block available
case 2: // Largest available hunk memory block
case 3: // Total amount of hunk memory
case 4: // Amount of free DOS paragraphs- SCI01
return make_reg(0, 0x7fff); // Must not be 0xffff, or some memory calculations will overflow
case K_MEMORYINFO_LARGEST_HEAP_BLOCK:
// In order to prevent "Memory fragmented" dialogs from
// popping up in some games, we must return FREE_HEAP - 2 here.
return make_reg(0, size - 2);
case K_MEMORYINFO_FREE_HEAP:
case K_MEMORYINFO_LARGEST_HUNK_BLOCK:
case K_MEMORYINFO_FREE_HUNK:
case K_MEMORYINFO_TOTAL_HUNK:
return make_reg(0, size);
default:
warning("Unknown MemoryInfo operation: %04x", argv[0].offset);