inline unsigned char
estimate_blocklevel(RenderPrimitiveLighting *self, RenderState *state,
int x, int y, int z, int *authoratative) {
/* placeholders for later data arrays, coordinates */
unsigned char block, blocklevel;
unsigned int average_count = 0, average_gather = 0, coeff = 0;
/* defaults to "guess" until told otherwise */
if (authoratative)
*authoratative = 0;
block = get_data(state, BLOCKS, x, y, z);
if (authoratative == NULL) {
int auth;
/* iterate through all surrounding blocks to take an average */
int dx, dy, dz, local_block;
for (dx = -1; dx <= 1; dx += 2) {
for (dy = -1; dy <= 1; dy += 2) {
for (dz = -1; dz <= 1; dz += 2) {
coeff = estimate_blocklevel(self, state, x+dx, y+dy, z+dz, &auth);
local_block = get_data(state, BLOCKS, x+dx, y+dy, z+dz);
/* only add if the block is transparent, this seems to look better than
using every block */
if (auth && is_transparent(local_block)) {
average_gather += coeff;
average_count++;
}
}
}
}
}
/* only return the average if at least one was authoratative */
if (average_count > 0) {
return average_gather / average_count;
}
blocklevel = get_data(state, BLOCKLIGHT, x, y, z);
/* no longer a guess */
if (!(block == 44 || block == 53 || block == 67 || block == 108 || block == 109) && authoratative) {
*authoratative = 1;
}
return blocklevel;
}
inline void
get_lighting_color(RenderPrimitiveLighting *self, RenderState *state,
int x, int y, int z,
unsigned char *r, unsigned char *g, unsigned char *b) {
/* placeholders for later data arrays, coordinates */
unsigned char block, skylevel, blocklevel;
block = get_data(state, BLOCKS, x, y, z);
skylevel = get_data(state, SKYLIGHT, x, y, z);
blocklevel = get_data(state, BLOCKLIGHT, x, y, z);
/* special half-step handling, stairs handling */
/* Anvil also needs to be here, blockid 145 */
if (block == 44 || block == 53 || block == 67 || block == 108 || block == 109 || block == 114 ||
block == 128 || block == 134 || block == 135 || block == 136 || block == 145 || block == 156) {
unsigned int upper_block;
/* stairs and half-blocks take the skylevel from the upper block if it's transparent */
int upper_counter = 0;
/* but if the upper_block is one of these special half-steps, we need to look at *its* upper_block */
do {
upper_counter++;
upper_block = get_data(state, BLOCKS, x, y + upper_counter, z);
} while (upper_block == 44 || upper_block == 53 || upper_block == 67 || upper_block == 108 ||
upper_block == 109 || upper_block == 114 || upper_block == 128 || upper_block == 134 ||
upper_block == 135 || upper_block == 136 || upper_block == 156 );
if (is_transparent(upper_block)) {
skylevel = get_data(state, SKYLIGHT, x, y + upper_counter, z);
} else {
skylevel = 15;
}
/* the block has a bad blocklevel, estimate it from neigborhood
* use given coordinates, no local ones! */
blocklevel = estimate_blocklevel(self, state, x, y, z, NULL);
}
if (block == 10 || block == 11) {
/* lava blocks should always be lit! */
*r = 255;
*g = 255;
*b = 255;
return;
}
self->calculate_light_color(self, MIN(skylevel, 15), MIN(blocklevel, 15), r, g, b);
}
inline unsigned char
estimate_blocklevel(RenderModeLighting *self, RenderState *state,
int x, int y, int z, int *authoratative) {
/* placeholders for later data arrays, coordinates */
PyObject *blocks = NULL;
PyObject *blocklight = NULL;
int local_x = x, local_y = y, local_z = z;
unsigned char block, blocklevel;
unsigned int average_count = 0, average_gather = 0, coeff = 0;
/* defaults to "guess" until told otherwise */
if (authoratative)
*authoratative = 0;
/* find out what chunk we're in, and translate accordingly */
if (x >= 0 && y < 16) {
blocks = state->blocks;
blocklight = self->blocklight;
} else if (x < 0) {
local_x += 16;
blocks = state->left_blocks;
blocklight = self->left_blocklight;
} else if (y >= 16) {
local_y -= 16;
blocks = state->right_blocks;
blocklight = self->right_blocklight;
}
/* make sure we have correctly-ranged coordinates */
if (!(local_x >= 0 && local_x < 16 &&
local_y >= 0 && local_y < 16 &&
local_z >= 0 && local_z < 128)) {
return 0;
}
/* also, make sure we have enough info to correctly calculate lighting */
if (blocks == Py_None || blocks == NULL ||
blocklight == Py_None || blocklight == NULL) {
return 0;
}
block = getArrayByte3D(blocks, local_x, local_y, local_z);
if (authoratative == NULL) {
int auth;
/* iterate through all surrounding blocks to take an average */
int dx, dy, dz, local_block;
for (dx = -1; dx <= 1; dx += 2) {
for (dy = -1; dy <= 1; dy += 2) {
for (dz = -1; dz <= 1; dz += 2) {
/* skip if block is out of range */
if (x+dx < 0 || x+dx >= 16 ||
y+dy < 0 || y+dy >= 16 ||
z+dz < 0 || z+dz >= 128) {
continue;
}
coeff = estimate_blocklevel(self, state, x+dx, y+dy, z+dz, &auth);
local_block = getArrayByte3D(blocks, x+dx, y+dy, z+dz);
/* only add if the block is transparent, this seems to look better than
using every block */
if (auth && is_transparent(local_block)) {
average_gather += coeff;
average_count++;
}
}
}
}
}
/* only return the average if at least one was authoratative */
if (average_count > 0) {
return average_gather / average_count;
}
blocklevel = getArrayByte3D(blocklight, local_x, local_y, local_z);
/* no longer a guess */
if (!(block == 44 || block == 53 || block == 67) && authoratative) {
*authoratative = 1;
}
return blocklevel;
}
inline float
get_lighting_coefficient(RenderModeLighting *self, RenderState *state,
int x, int y, int z) {
/* placeholders for later data arrays, coordinates */
PyObject *blocks = NULL;
PyObject *skylight = NULL;
PyObject *blocklight = NULL;
int local_x = x, local_y = y, local_z = z;
unsigned char block, skylevel, blocklevel;
/* find out what chunk we're in, and translate accordingly */
if (x >= 0 && y < 16) {
blocks = state->blocks;
skylight = self->skylight;
blocklight = self->blocklight;
} else if (x < 0) {
local_x += 16;
blocks = state->left_blocks;
skylight = self->left_skylight;
blocklight = self->left_blocklight;
} else if (y >= 16) {
local_y -= 16;
blocks = state->right_blocks;
skylight = self->right_skylight;
blocklight = self->right_blocklight;
}
/* make sure we have correctly-ranged coordinates */
if (!(local_x >= 0 && local_x < 16 &&
local_y >= 0 && local_y < 16 &&
local_z >= 0 && local_z < 128)) {
return self->calculate_darkness(15, 0);
}
/* also, make sure we have enough info to correctly calculate lighting */
if (blocks == Py_None || blocks == NULL ||
skylight == Py_None || skylight == NULL ||
blocklight == Py_None || blocklight == NULL) {
return self->calculate_darkness(15, 0);
}
block = getArrayByte3D(blocks, local_x, local_y, local_z);
/* if this block is opaque, use a fully-lit coeff instead
to prevent stippled lines along chunk boundaries! */
if (!is_transparent(block)) {
return self->calculate_darkness(15, 0);
}
skylevel = getArrayByte3D(skylight, local_x, local_y, local_z);
blocklevel = getArrayByte3D(blocklight, local_x, local_y, local_z);
/* special half-step handling */
if (block == 44 || block == 53 || block == 67) {
unsigned int upper_block;
/* stairs and half-blocks take the skylevel from the upper block if it's transparent */
if (local_z != 127) {
int upper_counter = 0;
/* but if the upper_block is one of these special half-steps, we need to look at *its* upper_block */
do {
upper_counter++;
upper_block = getArrayByte3D(blocks, local_x, local_y, local_z + upper_counter);
} while ((upper_block == 44 || upper_block == 54 || upper_block == 67) && local_z < 127);
if (is_transparent(upper_block)) {
skylevel = getArrayByte3D(skylight, local_x, local_y, local_z + upper_counter);
}
} else {
upper_block = 0;
skylevel = 15;
}
/* the block has a bad blocklevel, estimate it from neigborhood
* use given coordinates, no local ones! */
blocklevel = estimate_blocklevel(self, state, x, y, z, NULL);
}
if (block == 10 || block == 11) {
/* lava blocks should always be lit! */
return 0.0f;
}
return self->calculate_darkness(skylevel, blocklevel);
}
