slightly altered chargen (VENDOR + G/M produces 1px bar) for Mega65 native mode
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FeralChild64 committed
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@@ -17,3 +17,4 @@ build/*
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dump.mem
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*project
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.*swp
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*.log
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@@ -80,6 +80,7 @@ DEP_KERNAL = $(SRC_KERNAL) $(SRCDIR_KERNAL) $(GEN_KERNAL)
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TOOL_COLLECT_DATA = build/tools/collect_data
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TOOL_COMPRESS_TEXT = build/tools/compress_text
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TOOL_GENERATE_CONSTANTS = build/tools/generate_constants
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TOOL_PATCH_CHARGEN = build/tools/patch_chargen
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TOOL_PNGPREPARE = build/tools/pngprepare
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TOOL_BUILD_SEGMENT = build/tools/build_segment
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TOOL_RELEASE = build/tools/release
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@@ -172,7 +173,10 @@ build/tools/%: tools/%.cc tools/common.h
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# Rules - CHARGEN
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build/chargen.rom: $(TOOL_PNGPREPARE) assets/8x8font.png
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$(TOOL_PNGPREPARE) charrom assets/8x8font.png build/chargen.rom
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$(TOOL_PNGPREPARE) charrom assets/8x8font.png $@
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build/chargen-patched.rom: $(TOOL_PATCH_CHARGEN) build/chargen.rom
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$(TOOL_PATCH_CHARGEN) -i build/chargen.rom -o $@ -n 7px-OpenROMs
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# Dependencies - BASIC and KERNAL
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@@ -352,7 +356,7 @@ build/symbols_hybrid.vs: $(DIR_GEN)/KERNAL_combined.vs
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# Rules - platform 'Mega65' specific
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$(TARGET_M65_x): $(SEG_LIST_M65) build/chargen.rom
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$(TARGET_M65_x): $(SEG_LIST_M65) build/chargen.rom build/chargen-patched.rom
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dd if=/dev/zero bs=8192 count=1 of=build/m65_padding_08_KB
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dd if=/dev/zero bs=8192 count=8 of=build/m65_padding_64_KB
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cat build/m65_padding_08_KB > $(TARGET_M65_x)
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@@ -362,7 +366,7 @@ $(TARGET_M65_x): $(SEG_LIST_M65) build/chargen.rom
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cat build/m65_padding_08_KB >> $(TARGET_M65_x)
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cat $(DIR_M65)/basic.seg_0 >> $(TARGET_M65_x)
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cat build/chargen.rom >> $(TARGET_M65_x)
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cat build/chargen.rom >> $(TARGET_M65_x)
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cat build/chargen-patched.rom >> $(TARGET_M65_x)
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cat $(DIR_M65)/kernal.seg_0 >> $(TARGET_M65_x)
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cat build/m65_padding_64_KB >> $(TARGET_M65_x)
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rm -f build/m65_padding_*
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@@ -59,6 +59,12 @@ There is no official PETSCII code for `TAB` - we can't utilize the ones from C12
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Bits 3 and 4 are extension to the original variable, compatible with the C128 ROMs API. There is no official way to retrieve `NO_SCRL` status as of yet. The `40/80` key status cannot be retrieved in C64 mode at all (C128 hardware limitation).
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#### Mega65 native mode
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Mega65 build starts in legacy mode, which is intended to be reasonably compatible with the C64 ROMs. However, a native Mega65 mode is planned too, to make it easier to utilise extra features of this machine. Soo far the following has been done:
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- Slightly different chargen. On C64 machines prewssing C= + G or C= + M key combinations produces the same visual result as C= + H or C= + N, respectively - despite keycap printing suggests they should produce tinner bars. This was intentional change in the C64 ROMs (compared to VIC-20), to prevent colour problems on 80s era TVs. Screen font used in the legacy mode duplicates this change, but the font intended for native mode has this change reverted back.
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## Tinkering with OpenROMs
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@@ -0,0 +1,139 @@
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//
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// Utility to patch the character generator file to create
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// font for Mega65 native mode and possibly other uses
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//
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#include "common.h"
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#include <unistd.h>
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#include <fstream>
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#include <vector>
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//
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// Command line settings
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//
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std::string CMD_inFile = "chargen.rom";
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std::string CMD_outFile = "chargen-native.rom";
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std::string CMD_name = "CHARGEN";
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//
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// Common helper functions
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//
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void printUsage()
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{
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std::cout << "\n" <<
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"usage: patch_chargen [-i <in file>] [-o <out file>] [-n name]" << "\n\n";
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}
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void printBanner()
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{
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printBannerLineTop();
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std::cout << "// Generating patched font '" << CMD_name << "'" << "\n";
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printBannerLineBottom();
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}
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//
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// Top-level functions
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//
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void parseCommandLine(int argc, char **argv)
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{
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int opt;
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// Retrieve command line options
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while ((opt = getopt(argc, argv, "i:o:n:")) != -1)
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{
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switch(opt)
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{
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case 'i': CMD_inFile = optarg; break;
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case 'o': CMD_outFile = optarg; break;
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case 'n': CMD_name = optarg; break;
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default: printUsage(); ERROR();
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}
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}
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}
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//
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// Font processing
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//
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void processFont()
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{
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std::vector<uint8_t> fileContent;
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// Read the source file
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std::ifstream srcFile;
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srcFile.open(CMD_inFile, std::ios::in | std::ios::binary | std::ios::ate);
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if (!srcFile.good()) ERROR(std::string("unable to open ROM file '") + CMD_inFile + "'");
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auto srcSize = srcFile.tellg();
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if (srcSize != 4096) ERROR(std::string("incorrect size of ROM file '") + CMD_inFile + "'");
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std::vector<uint8_t> srcFileContent;
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fileContent.resize(srcSize);
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srcFile.seekg (0, srcFile.beg);
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srcFile.read((char *) fileContent.data(), fileContent.size());
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if (!srcFile.good()) ERROR(std::string("unable to read ROM file '") + CMD_inFile + "'");
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srcFile.close();
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// Patch the font
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for (uint8_t idx = 0; idx < 8; idx++)
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{
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// VENDOR + M - 2px width on C64
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fileContent[0x67 * 8 + 0 + idx] = 0b00000001; // normal
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fileContent[0x67 * 8 + 2048 + idx] = 0b00000001; // upper/lower case
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fileContent[0xE7 * 8 + 0 + idx] = 0b11111110; // inversed
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fileContent[0xE7 * 8 + 2048 + idx] = 0b11111110; // upper/lower case, inversed
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// VENDOR + G - 2px width on C64
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fileContent[0x65 * 8 + 0 + idx] = 0b10000000; // normal
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fileContent[0x65 * 8 + 2048 + idx] = 0b10000000; // upper/lower case
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fileContent[0xE5 * 8 + 0 + idx] = 0b01111111; // inversed
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fileContent[0xE5 * 8 + 2048 + idx] = 0b01111111; // upper/lower case, inversed
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}
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// Remove old file
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unlink(CMD_outFile.c_str());
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// Save the patched font
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std::ofstream outFile(CMD_outFile, std::fstream::out | std::ios::binary | std::fstream::trunc);
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if (!outFile.good()) ERROR(std::string("can't open oputput file '") + CMD_outFile + "'");
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outFile.write((const char*) fileContent.data(), fileContent.size());
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if (!outFile.good())
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{
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outFile.close();
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unlink(CMD_outFile.c_str());
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ERROR(std::string("can't write oputput file '") + CMD_outFile + "'");
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}
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outFile.close();
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}
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//
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// Main function
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//
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int main(int argc, char **argv)
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{
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parseCommandLine(argc, argv);
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printBanner();
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processFont();
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return 0;
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}
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