#include "common.h"
#include "memory.h"

#define PRIMBUFLEN  131072  // TODO: optimize this for a typical scene

static char primbuff[2][PRIMBUFLEN];	// Primitive buffer, just a raw buffer of bytes to use as a pool for primitives
static char *nextpri;
static char *primbuff_bounds;

char* const scratchpad = (char*)0x1F800000;

void *mem_scratch(char **scratch_offset, unsigned short size)
{
#if _DEBUG
    if (*scratch_offset + size > scratchpad + 1024)
        return NULL;
#endif

    void *result = *scratch_offset;
    *scratch_offset += size;
    return result;
}

void mem_prim_reset(int db)
{
    nextpri = primbuff[db];
    primbuff_bounds = nextpri + PRIMBUFLEN;
}

void *mem_prim(size_t size)
{
#if _DEBUG
    if (nextpri + size > primbuff_bounds)
        return NULL;    // TODO: report error
#endif

    void *prim = nextpri;
    nextpri += size;
    return prim;
}