complete rewrite

engine/tools/CMakeLists.txt

@@ -0,0 +1,9 @@
+include(GNUInstallDirs)
+
+macro(compile_tool name)
+	file(GLOB ${name}_SRC ${name}/*.c)
+	add_executable(${name} ${${name}_SRC})
+	target_include_directories(${name} PRIVATE ../../external/stb)
+endmacro()
+
+compile_tool(gb_dumpfont)

engine/tools/gb_dumpfont/gb_dumpfont.c

@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <stb_image_write.h>
+
+#define CHECK(s) ((linelen > strlen(s)) && memcmp(line, s, strlen(s)) == 0)
+
+int main() {
+	char*	       line = NULL;
+	size_t	       linesize;
+	ssize_t	       linelen;
+	int	       iw, ih;
+	unsigned char* font = NULL;
+	int	       c;
+	int	       p = 0;
+	int	       y = 0;
+	int	       w, h;
+
+	while((linelen = getline(&line, &linesize, stdin)) != -1) {
+		linelen--;
+
+		line[linelen] = 0;
+
+		if(CHECK("FONTBOUNDINGBOX ")) {
+			sscanf(line, "FONTBOUNDINGBOX %d %d", &w, &h);
+			printf("%dx%d font\n", w, h);
+
+			if(font != NULL) free(font);
+
+			iw   = w * 16;
+			ih   = h * 16;
+			font = malloc(iw * ih * 4);
+			memset(font, 0, iw * ih * 4);
+		} else if(CHECK("ENCODING ")) {
+			sscanf(line, "ENCODING %d", &c);
+		} else if(strcmp(line, "BITMAP") == 0) {
+			p = 1;
+			y = 0;
+		} else if(strcmp(line, "ENDCHAR") == 0) {
+			p = 0;
+		} else if(p && y < h) {
+			int bx = c % 16;
+			int by = c / 16;
+			int i;
+			int n = 0;
+
+			for(i = 0; i < w; i++) {
+				if((i % 4) == 0) {
+					char buf[2];
+
+					buf[0] = line[i / 4];
+					buf[1] = 0;
+
+					n = strtol(buf, NULL, 16);
+				}
+
+				if(n & (1 << 3)) {
+					unsigned char* px = &font[((by * h + y) * iw + bx * w + i) * 4];
+					memset(px, 255, 4);
+				}
+
+				n = n << 1;
+			}
+
+			y++;
+		}
+	}
+
+	if(font != NULL) stbi_write_png("font.png", iw, ih, 4, font, 0);
+	return 0;
+}

engine/tools/gb_dumpfont/stb_image_write.c

@@ -0,0 +1,2 @@
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include <stb_image_write.h>