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/*
* Descent 3
* Copyright (C) 2024 Parallax Software
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include "lightmap.h"
#include "pstypes.h"
#include "pserror.h"
#include "bitmap.h"
#include "mono.h"
#include "mem.h"
#if !defined(POSIX)
#include "Macros.h"
#endif
#include <algorithm>
static int Num_of_lightmaps = 0;
static uint16_t Free_lightmap_list[MAX_LIGHTMAPS];
bms_lightmap GameLightmaps[MAX_LIGHTMAPS];
static int Lightmap_mem_used = 0;
// Sets all the lightmaps to unused
void lm_InitLightmaps() {
int i;
for (i = 0; i < MAX_LIGHTMAPS; i++) {
GameLightmaps[i].flags = 0;
GameLightmaps[i].used = 0;
GameLightmaps[i].data = NULL;
GameLightmaps[i].cache_slot = -1;
Free_lightmap_list[i] = i;
}
atexit(lm_ShutdownLightmaps);
}
void lm_ShutdownLightmaps(void) {
int i;
mprintf(0, "Freeing all lightmap memory.\n");
for (i = 0; i < MAX_LIGHTMAPS; i++) {
while (GameLightmaps[i].used > 0)
lm_FreeLightmap(i);
}
}
// Allocs a lightmap of w x h size
// Returns lightmap handle if successful, -1 if otherwise
int lm_AllocLightmap(int w, int h) {
int n; //,i;
if (Num_of_lightmaps == MAX_LIGHTMAPS)
Int3(); // Ran out of lightmaps!
n = Free_lightmap_list[Num_of_lightmaps++];
ASSERT(GameLightmaps[n].used == 0);
// If no go on the malloc, bail out with -1
memset(&GameLightmaps[n], 0, sizeof(bms_lightmap));
GameLightmaps[n].data = (uint16_t *)mem_malloc((w * h * 2));
if (!GameLightmaps[n].data) {
mprintf(0, "NOT ENOUGH MEMORY FOR LIGHTMAP!\n");
Int3();
return BAD_LM_INDEX;
}
GameLightmaps[n].width = w;
GameLightmaps[n].height = h;
GameLightmaps[n].used = 1;
GameLightmaps[n].cache_slot = -1;
GameLightmaps[n].flags = LF_CHANGED;
// Figure out square size
// Find power of 2 number
int res = std::max(w, h);
int lightmap_res = 2;
for (int i = 0; i <= 7; i++) {
int low_num = 1 < i;
int hi_num = 2 << i;
if (res <= hi_num && res > low_num) {
lightmap_res = hi_num;
break;
}
}
ASSERT(lightmap_res >= 2 && lightmap_res <= 128);
GameLightmaps[n].square_res = lightmap_res;
Lightmap_mem_used += (w * h * 2);
return n;
}
// Given a handle, frees the lightmap memory and flags this lightmap as unused
void lm_FreeLightmap(int handle) {
if (GameLightmaps[handle].used < 1)
return;
GameLightmaps[handle].used--;
if (GameLightmaps[handle].used == 0) {
if (GameLightmaps[handle].data != NULL)
mem_free(GameLightmaps[handle].data);
Lightmap_mem_used -= (GameLightmaps[handle].width * GameLightmaps[handle].height * 2);
GameLightmaps[handle].data = NULL;
GameLightmaps[handle].cache_slot = -1;
Free_lightmap_list[--Num_of_lightmaps] = handle;
}
}
// returns a lightmaps width else -1 if something is wrong
int lm_w(int handle) {
int w;
if (!GameLightmaps[handle].used) {
Int3();
return -1;
}
w = GameLightmaps[handle].width;
return (w);
}
// returns a lightmaps height , else -1 if something is wrong
int lm_h(int handle) {
int h;
if (!GameLightmaps[handle].used) {
Int3();
return -1;
}
h = GameLightmaps[handle].height;
return (h);
}
// returns a lightmaps data else NULL if something is wrong
uint16_t *lm_data(int handle) {
uint16_t *d;
if (!GameLightmaps[handle].used) {
Int3();
return NULL;
}
d = GameLightmaps[handle].data;
return (d);
}
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