slightly altered chargen (VENDOR + G/M produces 1px bar) for Mega65 native mode

tools/patch_chargen.cc

@@ -0,0 +1,139 @@
+//
+// Utility to patch the character generator file to create
+// font for Mega65 native mode and possibly other uses
+//
+
+#include "common.h"
+
+#include <unistd.h>
+
+#include <fstream>
+#include <vector>
+
+//
+// Command line settings
+//
+
+std::string CMD_inFile  = "chargen.rom";
+std::string CMD_outFile = "chargen-native.rom";
+std::string CMD_name    = "CHARGEN";
+
+//
+// Common helper functions
+//
+
+void printUsage()
+{
+    std::cout << "\n" <<
+        "usage: patch_chargen [-i <in file>] [-o <out file>] [-n name]" << "\n\n";
+}
+
+void printBanner()
+{
+    printBannerLineTop();
+    std::cout << "// Generating patched font '" << CMD_name << "'" << "\n";
+    printBannerLineBottom();
+}
+
+//
+// Top-level functions
+//
+
+void parseCommandLine(int argc, char **argv)
+{
+    int opt;
+
+    // Retrieve command line options
+
+    while ((opt = getopt(argc, argv, "i:o:n:")) != -1)
+    {
+        switch(opt)
+        {
+            case 'i': CMD_inFile    = optarg; break;
+            case 'o': CMD_outFile   = optarg; break;
+            case 'n': CMD_name      = optarg; break;
+            default: printUsage(); ERROR();
+        }
+    }
+}
+
+//
+// Font processing
+//
+
+void processFont()
+{
+	std::vector<uint8_t> fileContent;
+	
+    // Read the source file
+
+    std::ifstream srcFile;
+    srcFile.open(CMD_inFile, std::ios::in | std::ios::binary | std::ios::ate);
+
+    if (!srcFile.good()) ERROR(std::string("unable to open ROM file '") + CMD_inFile + "'");
+	
+    auto srcSize = srcFile.tellg();
+    if (srcSize != 4096) ERROR(std::string("incorrect size of ROM file '") + CMD_inFile + "'");
+
+	std::vector<uint8_t> srcFileContent;
+
+    fileContent.resize(srcSize);
+    srcFile.seekg (0, srcFile.beg);
+    srcFile.read((char *) fileContent.data(), fileContent.size());
+
+    if (!srcFile.good()) ERROR(std::string("unable to read ROM file '") + CMD_inFile + "'");
+    srcFile.close();
+
+	// Patch the font
+
+	for (uint8_t idx = 0; idx < 8; idx++)
+	{
+        // VENDOR + M - 2px width on C64
+
+		fileContent[0x67 * 8 +    0 + idx] = 0b00000001; // normal
+		fileContent[0x67 * 8 + 2048 + idx] = 0b00000001; // upper/lower case
+        fileContent[0xE7 * 8 +    0 + idx] = 0b11111110; // inversed
+        fileContent[0xE7 * 8 + 2048 + idx] = 0b11111110; // upper/lower case, inversed
+
+        // VENDOR + G - 2px width on C64
+
+		fileContent[0x65 * 8 +    0 + idx] = 0b10000000; // normal
+		fileContent[0x65 * 8 + 2048 + idx] = 0b10000000; // upper/lower case
+        fileContent[0xE5 * 8 +    0 + idx] = 0b01111111; // inversed
+        fileContent[0xE5 * 8 + 2048 + idx] = 0b01111111; // upper/lower case, inversed
+	}
+	
+    // Remove old file
+
+    unlink(CMD_outFile.c_str());
+	
+	// Save the patched font
+	
+    std::ofstream outFile(CMD_outFile, std::fstream::out | std::ios::binary | std::fstream::trunc);
+    if (!outFile.good()) ERROR(std::string("can't open oputput file '") + CMD_outFile + "'");
+
+	outFile.write((const char*) fileContent.data(), fileContent.size());
+	
+    if (!outFile.good())
+    {
+    	outFile.close();
+    	unlink(CMD_outFile.c_str());
+    	ERROR(std::string("can't write oputput file '") + CMD_outFile + "'");
+    }
+
+    outFile.close();	
+}
+
+//
+// Main function
+//
+
+int main(int argc, char **argv)
+{
+    parseCommandLine(argc, argv);
+
+    printBanner();
+    processFont();
+
+    return 0;
+}