Descent3/bitmap/bumpmap.cpp

#include <stdlib.h>
#include <string.h>
#include "bumpmap.h"
#include "pstypes.h"
#include "pserror.h"
#include "mono.h"
#include "mem.h"

int Num_of_bumpmaps = 0;
static ushort Free_bumpmap_list[MAX_BUMPMAPS];

bms_bumpmap GameBumpmaps[MAX_BUMPMAPS];
int Bumpmap_mem_used = 0;

// Sets all the bumpmaps to unused
void bump_InitBumpmaps() {
  int i;

  for (i = 0; i < MAX_BUMPMAPS; i++) {
    GameBumpmaps[i].flags = 0;
    GameBumpmaps[i].data = NULL;
    GameBumpmaps[i].cache_slot = -1;
    Free_bumpmap_list[i] = i;
  }

  atexit(bump_ShutdownBumpmaps);
}
void bump_ShutdownBumpmaps(void) {
  int i;

  mprintf((0, "Freeing all bumpmap memory.\n"));

  for (i = 0; i < MAX_BUMPMAPS; i++) {
    while (GameBumpmaps[i].flags & BUMPF_USED)
      bump_FreeBumpmap(i);
  }
}

// Allocs a bumpmap of w*h size
// Returns bumpmap handle if successful, -1 if otherwise

int bump_AllocBumpmap(int w, int h) {
  int n; //,i;

  if (Num_of_bumpmaps == MAX_BUMPMAPS)
    Int3(); // Ran out of bumpmaps!

  n = Free_bumpmap_list[Num_of_bumpmaps++];
  ASSERT(!(GameBumpmaps[n].flags & BUMPF_USED));

  // If no go on the malloc, bail out with -1

  memset(&GameBumpmaps[n], 0, sizeof(bms_bumpmap));

  GameBumpmaps[n].data = (ushort *)mem_malloc(w * h * 2);
  if (!GameBumpmaps[n].data) {
    mprintf((0, "NOT ENOUGHT MEMORY FOR BUMPMAP!\n"));
    Int3();
    return BAD_BUMP_INDEX;
  }

  GameBumpmaps[n].cache_slot = -1;
  GameBumpmaps[n].flags = BUMPF_USED | BUMPF_CHANGED;
  GameBumpmaps[n].width = w;
  GameBumpmaps[n].height = h;

  Bumpmap_mem_used += (w * h * 2);

  return n;
}

// Given a handle, frees the bumpmap memory and flags this bumpmap as unused
void bump_FreeBumpmap(int handle) {
  ASSERT(GameBumpmaps[handle].flags & BUMPF_USED);

  if (GameBumpmaps[handle].data != NULL)
    mem_free(GameBumpmaps[handle].data);

  Bumpmap_mem_used -= (GameBumpmaps[handle].width * GameBumpmaps[handle].height * 2);

  GameBumpmaps[handle].data = NULL;
  GameBumpmaps[handle].flags &= ~BUMPF_USED;

  Free_bumpmap_list[--Num_of_bumpmaps] = handle;
}

// returns a bumpmaps data else NULL if something is wrong
ushort *bump_data(int handle) {
  ushort *d;

  if (!(GameBumpmaps[handle].flags & BUMPF_USED)) {
    Int3();
    return NULL;
  }

  d = GameBumpmaps[handle].data;

  return (d);
}

// returns width of bumpmap
ubyte bump_w(int handle) {
  ASSERT(GameBumpmaps[handle].flags & BUMPF_USED);
  return GameBumpmaps[handle].width;
}

// returns height of bumpmap
ubyte bump_h(int handle) {
  ASSERT(GameBumpmaps[handle].flags & BUMPF_USED);
  return GameBumpmaps[handle].height;
}