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#include "global.h"
#include "script.h"
u16 ScriptReadHalfword(struct ScriptContext *ctx);
void InitScriptContext(struct ScriptContext *ctx, void *cmdTable, void *cmdTableEnd)
{
u32 i;
ctx->mode = 0;
ctx->scriptPtr = 0;
ctx->stackDepth = 0;
ctx->nativePtr = 0;
ctx->cmdTable = cmdTable;
ctx->cmdTableEnd = cmdTableEnd;
for (i = 0; i < 4; i++)
ctx->data[i] = 0;
for (i = 0; i < 20; i++)
ctx->stack[i] = 0;
ctx->unk74 = 0;
}
u8 SetupBytecodeScript(struct ScriptContext *ctx, const u8 *ptr)
{
ctx->scriptPtr = ptr;
ctx->mode = 1;
return 1;
}
void SetupNativeScript(struct ScriptContext *ctx, u8 (*ptr)(struct ScriptContext *))
{
ctx->mode = 2;
ctx->nativePtr = ptr;
}
void StopScript(struct ScriptContext *ctx)
{
ctx->mode = 0;
ctx->scriptPtr = 0;
}
void FUN_02038B6C(struct ScriptContext *ctx, int r1)
{
ctx->unk74 = r1;
}
extern void ErrorHandling(void);
u8 RunScriptCommand(struct ScriptContext *ctx)
{
if (ctx->mode == 0)
return FALSE;
switch (ctx->mode)
{
case 0:
return FALSE;
case 2:
if (ctx->nativePtr)
{
if (ctx->nativePtr(ctx) == TRUE)
ctx->mode = 1;
return TRUE;
}
ctx->mode = 1;
case 1:
while (1)
{
u16 cmdCode;
ScrCmdFunc *func;
if (!ctx->scriptPtr)
{
ctx->mode = 0;
return FALSE;
}
cmdCode = ScriptReadHalfword(ctx);
u32 cmdTableEnd = (u32)ctx->cmdTableEnd;
if (cmdCode >= cmdTableEnd)
{
ErrorHandling();
ctx->mode = 0;
return FALSE;
}
func = &ctx->cmdTable[cmdCode];
if ((*func)(ctx) == 1)
break;
}
}
return TRUE;
}
u8 ScriptPush(struct ScriptContext *ctx, const u8 *ptr)
{
if (ctx->stackDepth + 1 >= 20)
{
return 1;
}
else
{
ctx->stack[ctx->stackDepth] = ptr;
ctx->stackDepth++;
return 0;
}
}
const u8 *ScriptPop(struct ScriptContext *ctx)
{
if (ctx->stackDepth == 0)
return NULL;
ctx->stackDepth--;
return ctx->stack[ctx->stackDepth];
}
void ScriptJump(struct ScriptContext *ctx, const u8 *ptr)
{
ctx->scriptPtr = ptr;
}
u8 ScriptCall(struct ScriptContext *ctx, const u8 *ptr)
{
u8 ret = ScriptPush(ctx, ctx->scriptPtr);
ctx->scriptPtr = ptr;
return ret;
}
void ScriptReturn(struct ScriptContext *ctx)
{
ctx->scriptPtr = ScriptPop(ctx);
}
u16 ScriptReadHalfword(struct ScriptContext *ctx)
{
u16 value = *(ctx->scriptPtr++);
value += *(ctx->scriptPtr++) << 8;
return value;
}
u32 ScriptReadWord(struct ScriptContext *ctx)
{
u32 value0 = *(ctx->scriptPtr++);
u32 value1 = *(ctx->scriptPtr++);
u32 value2 = *(ctx->scriptPtr++);
u32 value3 = *(ctx->scriptPtr++);
u32 retVal = 0;
retVal += value3;
retVal <<= 8;
retVal += value2;
retVal <<= 8;
retVal += value1;
retVal <<= 8;
retVal += value0;
return retVal;
}
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