Generate light layer

4 files changed, 51 insertions, 29 deletions

diff --git a/src/MinedMap.cpp b/src/MinedMap.cpp
index bf6f4fb..5092ceb 100644
--- a/src/MinedMap.cpp
+++ b/src/MinedMap.cpp
@@ -52,16 +52,21 @@ namespace MinedMap {
 static const size_t DIM = World::Region::SIZE*World::Chunk::SIZE;
 
 
-static void addChunk(uint32_t image[DIM*DIM], size_t X, size_t Z, const World::Chunk *chunk) {
+static void addChunk(uint32_t image[DIM*DIM], uint8_t lightmap[2*DIM*DIM], size_t X, size_t Z, const World::Chunk *chunk) {
 	World::Chunk::Blocks layer = chunk->getTopLayer();
 
 	for (size_t x = 0; x < World::Chunk::SIZE; x++) {
-		for (size_t z = 0; z < World::Chunk::SIZE; z++)
-			image[(Z*World::Chunk::SIZE+z)*DIM + X*World::Chunk::SIZE+x] = htonl(layer.blocks[x][z].getColor());
+		for (size_t z = 0; z < World::Chunk::SIZE; z++) {
+			size_t i = (Z*World::Chunk::SIZE+z)*DIM + X*World::Chunk::SIZE+x;
+			const World::Block &block = layer.blocks[x][z];
+
+			image[i] = htonl(block.getColor());
+			lightmap[2*i+1] = (1 - block.getBlockLight()/15.f)*128;
+		}
 	}
 }
 
-static void doRegion(const std::string &input, const std::string &output) {
+static void doRegion(const std::string &input, const std::string &output, const std::string &output_light) {
 	struct stat instat, outstat;
 
 	if (stat(input.c_str(), &instat) < 0) {
@@ -80,21 +85,30 @@ static void doRegion(const std::string &input, const std::string &output) {
 	std::printf("Generating %s from %s...\n", output.c_str(), input.c_str());
 
 	const std::string tmpfile = output + ".tmp";
+	const std::string tmpfile_light = output_light + ".tmp";
 
 	try {
 		uint32_t image[DIM*DIM] = {};
-		World::Region::visitChunks(input.c_str(), [&image] (size_t X, size_t Z, const World::Chunk *chunk) { addChunk(image, X, Z, chunk); });
+		uint8_t lightmap[2*DIM*DIM] = {};
+		World::Region::visitChunks(input.c_str(), [&] (size_t X, size_t Z, const World::Chunk *chunk) { addChunk(image, lightmap, X, Z, chunk); });
 
-		PNG::write(tmpfile.c_str(), reinterpret_cast<const uint8_t*>(image), DIM, DIM);
+		PNG::write(tmpfile.c_str(), reinterpret_cast<const uint8_t*>(image), DIM, DIM, true);
+		PNG::write(tmpfile_light.c_str(), lightmap, DIM, DIM, false);
 
 		struct timespec times[2] = {instat.st_mtim, instat.st_mtim};
 		if (utimensat(AT_FDCWD, tmpfile.c_str(), times, 0) < 0)
 			std::fprintf(stderr, "Warning: failed to set utime on %s: %s\n", tmpfile.c_str(), std::strerror(errno));
+		if (utimensat(AT_FDCWD, tmpfile_light.c_str(), times, 0) < 0)
+			std::fprintf(stderr, "Warning: failed to set utime on %s: %s\n", tmpfile_light.c_str(), std::strerror(errno));
 
 		if (std::rename(tmpfile.c_str(), output.c_str()) < 0) {
 			std::fprintf(stderr, "Unable to save %s: %s\n", output.c_str(), std::strerror(errno));
 			unlink(tmpfile.c_str());
 		}
+		if (std::rename(tmpfile_light.c_str(), output_light.c_str()) < 0) {
+			std::fprintf(stderr, "Unable to save %s: %s\n", output_light.c_str(), std::strerror(errno));
+			unlink(tmpfile_light.c_str());
+		}
 	}
 	catch (const std::exception& ex) {
 		std::fprintf(stderr, "Failed to generate %s: %s\n", output.c_str(), ex.what());
@@ -140,9 +154,11 @@ int main(int argc, char *argv[]) {
 	std::string regiondir = inputdir + "/region";
 
 	std::string outputdir(argv[2]);
-	std::string regionoutdir = outputdir + "/0";
 
-	makeDir(regionoutdir);
+	makeDir(outputdir + "/map");
+	makeDir(outputdir + "/map/0");
+	makeDir(outputdir + "/light");
+	makeDir(outputdir + "/light/0");
 
 	DIR *dir = opendir(regiondir.c_str());
 	if (!dir) {
@@ -160,8 +176,8 @@ int main(int argc, char *argv[]) {
 
 		info.addRegion(x, z);
 
-		std::string name(entry->d_name);
-		doRegion(regiondir + "/" + name, regionoutdir + "/" + name.substr(0, name.length()-3) + "png");
+		std::string name(entry->d_name), outname = name.substr(0, name.length()-3) + "png";
+		doRegion(regiondir + "/" + name, outputdir + "/map/0/" + outname, outputdir + "/light/0/" + outname);
 	}
 
 	closedir(dir);
diff --git a/src/PNG.cpp b/src/PNG.cpp
index 0154f61..78df385 100644
--- a/src/PNG.cpp
+++ b/src/PNG.cpp
@@ -37,7 +37,7 @@
 namespace MinedMap {
 namespace PNG {
 
-void write(const char *filename, const uint8_t *data, size_t width, size_t height) {
+void write(const char *filename, const uint8_t *data, size_t width, size_t height, bool colored) {
 	std::FILE *f = std::fopen(filename, "wb");
 	if (!f)
 		throw std::system_error(errno, std::generic_category(), "unable to open PNG file");
@@ -60,12 +60,12 @@ void write(const char *filename, const uint8_t *data, size_t width, size_t heigh
 
 	png_init_io(png_ptr, f);
 
-	png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,
+	png_set_IHDR(png_ptr, info_ptr, width, height, 8, colored ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_GRAY_ALPHA,
 		     PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
 
 	uint8_t *row_pointers[height];
 	for (size_t i = 0; i < height; i++)
-		row_pointers[i] = const_cast<uint8_t*>(&data[4*i*width]);
+		row_pointers[i] = const_cast<uint8_t*>(&data[(colored ? 4 : 2)*i*width]);
 
 	png_set_rows(png_ptr, info_ptr, row_pointers);
 	png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, nullptr);
@@ -74,7 +74,7 @@ void write(const char *filename, const uint8_t *data, size_t width, size_t heigh
 	std::fclose(f);
 }
 
-void read(const char *filename, uint8_t *data, size_t width, size_t height) {
+void read(const char *filename, uint8_t *data, size_t width, size_t height, bool colored) {
 	std::FILE *f = std::fopen(filename, "rb");
 	if (!f)
 		throw std::system_error(errno, std::generic_category(), "unable to open PNG file");
@@ -108,44 +108,46 @@ void read(const char *filename, uint8_t *data, size_t width, size_t height) {
 	if (png_get_image_width(png_ptr, info_ptr) != width
 	    || png_get_image_height(png_ptr, info_ptr) != height
 	    || png_get_bit_depth(png_ptr, info_ptr) != 8
-	    || png_get_color_type(png_ptr, info_ptr) != PNG_COLOR_TYPE_RGB_ALPHA)
+	    || png_get_color_type(png_ptr, info_ptr) != (colored ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_GRAY_ALPHA))
 		longjmp(png_jmpbuf(png_ptr), 1);
 
 	uint8_t **row_pointers = png_get_rows(png_ptr, info_ptr);
 	for (size_t i = 0; i < height; i++)
-		std::memcpy(&data[4*i*width], row_pointers[i], 4*width);
+		std::memcpy(&data[(colored ? 4 : 2)*i*width], row_pointers[i], (colored ? 4 : 2)*width);
 
 	png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
 	std::fclose(f);
 }
 
-static void readScaled(uint8_t *data, size_t offset_w, size_t offset_h, const char *file, size_t width, size_t height) {
+static void readScaled(uint8_t *data, size_t offset_w, size_t offset_h, const char *file, size_t width, size_t height, bool colored) {
 	if (!file)
 		return;
 
+	size_t b = (colored ? 4 : 2);
+
 	uint8_t input[4*width*height];
-	read(file, input, width, height);
+	read(file, input, width, height, colored);
 
 	for (size_t h = 0; h < width/2; h++) {
 		for (size_t w = 0; w < width/2; w++) {
 			for (size_t c = 0; c < 4; c++) {
-				size_t i = 8*width*h + 8*w + c;
-				data[4*width*(offset_h+h) + 4*(offset_w+w) + c] = (input[i] + input[i+4] + input[i+4*width] + input[i+4*width+4])/4;
+				size_t i = 2*b*(width*h + w) + c;
+				data[b*(width*(offset_h+h) + offset_w+w) + c] = (input[i] + input[i+b] + input[i+b*width] + input[i+b*width+b])/4;
 			}
 		}
 	}
 }
 
-void mipmap(const char *output, size_t width, size_t height, const char *nw, const char *ne, const char *sw, const char *se) {
+void mipmap(const char *output, size_t width, size_t height, bool colored, const char *nw, const char *ne, const char *sw, const char *se) {
 	uint8_t data[4*width*height];
 	std::memset(data, 0, sizeof(data));
 
-	readScaled(data, 0, 0, nw, width, height);
-	readScaled(data, width/2, 0, ne, width, height);
-	readScaled(data, 0, height/2, sw, width, height);
-	readScaled(data, width/2, height/2, se, width, height);
+	readScaled(data, 0, 0, nw, width, height, colored);
+	readScaled(data, width/2, 0, ne, width, height, colored);
+	readScaled(data, 0, height/2, sw, width, height, colored);
+	readScaled(data, width/2, height/2, se, width, height, colored);
 
-	write(output, data, width, height);
+	write(output, data, width, height, true);
 }
 
 }
diff --git a/src/PNG.hpp b/src/PNG.hpp
index 1647d03..ee6ffd4 100644
--- a/src/PNG.hpp
+++ b/src/PNG.hpp
@@ -33,9 +33,9 @@
 namespace MinedMap {
 namespace PNG {
 
-void write(const char *filename, const uint8_t *data, size_t width, size_t height);
-void read(const char *filename, uint8_t *data, size_t width, size_t height);
-void mipmap(const char *output, size_t width, size_t height, const char *nw, const char *ne, const char *sw, const char *se);
+void write(const char *filename, const uint8_t *data, size_t width, size_t height, bool colored);
+void read(const char *filename, uint8_t *data, size_t width, size_t height, bool colored);
+void mipmap(const char *output, size_t width, size_t height, bool colored, const char *nw, const char *ne, const char *sw, const char *se);
 
 }
 }
diff --git a/src/World/Block.hpp b/src/World/Block.hpp
index f078503..b636f06 100644
--- a/src/World/Block.hpp
+++ b/src/World/Block.hpp
@@ -47,6 +47,10 @@ struct Block {
 	Block(uint8_t id0, uint8_t data0, unsigned height0, uint8_t blockLight0, uint8_t skyLight0, uint8_t biome0)
 		: id(id0), data(data0), height(height0), blockLight(blockLight0), skyLight(skyLight0), biome(biome0) {}
 
+	uint8_t getBlockLight() const {
+		return blockLight;
+	}
+
 	uint32_t getColor() const;
 };