Function InitDynamicLighting

Descent3/lighting.cpp:118–172

Sets up our dynamic lighting maps and tables

// Sets up our dynamic lighting maps
// and tables
void InitDynamicLighting() {
  int i, cl, size;

  mprintf(0, "Initting dynamic lighting.\n");

  memset(Lmi_spoken_for, 0, MAX_LIGHTMAP_INFOS / 8);

  for (i = 0; i < 16; i++)
    Light_component_scalar[i] = i / 15.0;
  for (i = 16; i < 32; i++)
    Light_component_scalar[i] = 1.0;

  for (cl = 0, size = 128; size >= 2; size >>= 1, cl++) {
    Specular_maps[cl] = lm_AllocLightmap(size, size);
    ASSERT(Specular_maps[cl] != BAD_LM_INDEX);
  }

  // Init our dynamic memory
  if (Mem_low_memory_mode) {
    // Just use 1 meg if in low mem mode
    DYNAMIC_LIGHTMAP_MEMORY = 500000;
  }

  Dynamic_lightmap_memory = (uint16_t *)mem_malloc(DYNAMIC_LIGHTMAP_MEMORY);

  // Init our records list
  Dynamic_lightmaps = (dynamic_lightmap *)mem_malloc(sizeof(dynamic_lightmap) * MAX_DYNAMIC_LIGHTMAPS);
  ASSERT(Dynamic_lightmaps);

  for (i = 0; i < MAX_DYNAMIC_LIGHTMAPS; i++) {
    memset(&Dynamic_lightmaps[i], 0, sizeof(dynamic_lightmap));
  }

  // Setup uint8_t to float
  for (i = 0; i < 256; i++)
    Ubyte_to_float[i] = (float)i / 255.0;

  // Setup specular tables
  mprintf(0, "Building specular tables.\n");

  for (i = 0; i < MAX_SPECULAR_INCREMENTS; i++) {
    float val = (float)i / (float)(MAX_SPECULAR_INCREMENTS - 1);

    // Metal
    Specular_tables[0][i] = (val * val * val * val * val * val);

    // Plastic
    Specular_tables[1][i] = (val * val * val * val * val * val * val * val * val * val * val * val * val * val);

    // Marble
    Specular_tables[2][i] = (val * val * val * val);
  }

  atexit(FreeLighting);
}

// Given a float, returns the index into the Ubyte_float_table that this number
// corresponds to