added floating point constants generator
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FeralChild64 committed
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@@ -44,7 +44,7 @@ SRC_TOOLS = $(wildcard src/tools/*.c,src/tools/*.cc)
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# Generated files
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GEN_BASIC = build/,generated/packed_messages.s
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GEN_BASIC = build/,generated/packed_messages.s build/,generated/float_constants.s
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GEN_KERNAL =
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# List of build directories
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@@ -70,13 +70,14 @@ DEP_KERNAL = $(SRC_KERNAL) $(SRCDIR_KERNAL) $(GEN_KERNAL)
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# List of tools
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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_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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TOOL_SIMILARITY = build/tools/similarity
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TOOL_ASSEMBLER = assembler/KickAss.jar
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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_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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TOOL_SIMILARITY = build/tools/similarity
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TOOL_ASSEMBLER = assembler/KickAss.jar
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TOOLS_LIST = $(pathsubst src/tools/%,build/tools/%,$(basename $(SRC_TOOLS)))
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@@ -212,6 +213,10 @@ build/,generated/packed_messages.s: $(TOOL_COMPRESS_TEXT)
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@mkdir -p build/,generated
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$(TOOL_COMPRESS_TEXT) > build/,generated/packed_messages.s
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build/,generated/float_constants.s: $(TOOL_GENERATE_CONSTANTS)
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@mkdir -p build/,generated
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$(TOOL_GENERATE_CONSTANTS) -o build/,generated/float_constants.s
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.PRECIOUS: build/target_%/OUTB_X.BIN build/target_%/BASIC_combined.vs
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build/target_%/OUTB_X.BIN build/target_%/BASIC_combined.vs:
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@mkdir -p build/target_$*
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@@ -0,0 +1,222 @@
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//
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// Utility to generate various floating points constants
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// in a Commodore-specific variable format
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//
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#include "common.h"
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#include <unistd.h>
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#include <cmath>
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#include <cstdio>
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#include <fstream>
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#include <iomanip>
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#include <vector>
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//
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// Basic types definition
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//
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typedef struct ConstEntry
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{
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ConstEntry(const std::string &constName, double constValue) :
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constName(constName),
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constValue(constValue),
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outString(".error \"not generated\"")
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{
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};
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const std::string constName;
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const double constValue;
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std::string outString;
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} ConstEntry;
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//
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// Constants to output
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//
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std::vector<ConstEntry> GLOBAL_constants =
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{
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ConstEntry( "PI", M_PI ),
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ConstEntry( "HALF", 0.5 ),
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ConstEntry( "1", 1.0 ),
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ConstEntry( "10", 10.0 ),
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};
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//
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// Command line settings
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//
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std::string CMD_outFile = "out.s";
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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: generate_constants [-o <out file>]" << "\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 floating point constants" << "\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, "o:")) != -1)
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{
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switch(opt)
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{
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case 'o': CMD_outFile = 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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// Constants generation
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//
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std::string toAssemblerString(const std::string &constName, double constValue)
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{
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uint8_t outFloat[5] = { 0 };
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// Retrieve mantissa nad exponent
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int exponent = -0x80;
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double mantissa = frexp(std::abs(constValue), &exponent);
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// Add a bias to exponent
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exponent += 0x80;
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// Check if output format can contain such a number
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if (exponent > 0xFF)
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{
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ERROR(std::string("const '") + constName + "' abs value too large");
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}
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else if (exponent <= 0)
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{
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ERROR(std::string("const '") + constName + "' abs value too small");
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}
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// Set output constant exponent
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outFloat[0] = exponent;
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// Set output constant mantissa
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for (uint8_t idxByte = 1; idxByte <= 4; idxByte++)
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{
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for (uint8_t idxBit = 0; idxBit <= 7; idxBit++)
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{
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outFloat[idxByte] = outFloat[idxByte] << 1;
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if (mantissa >= 0.5)
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{
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outFloat[idxByte]++;
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mantissa -= 0.5;
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}
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mantissa *= 2;
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}
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}
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if (outFloat[1] < 0x80) ERROR(std::string("const '") + constName + "' not normalized");
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// Set output constant sign
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if (constValue >= 0.0)
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{
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outFloat[1] = outFloat[1] & 0x7F;
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}
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// Return the output constant as string for assembler
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char buf[256] = { 0 };
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snprintf(buf, sizeof(buf), "$%02X, $%02X, $%02X, $%02X, $%02X // %22.10f",
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outFloat[0],
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outFloat[1],
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outFloat[2],
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outFloat[3],
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outFloat[4],
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constValue);
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std::string outDef = std::string("\n.macro putConst_") + constName + "()\n{\n\t.byte " + buf + "\n}\n";
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return outDef;
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}
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void writeConstants()
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{
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// Convert constants to assembler strings
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for (auto &entry : GLOBAL_constants)
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{
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entry.outString = toAssemblerString(entry.constName, entry.constValue);
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}
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// Remove old file
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unlink(CMD_outFile.c_str());
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// Open output file for writing
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std::ofstream outFile(CMD_outFile, std::fstream::out | std::fstream::trunc);
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if (!outFile.good()) ERROR(std::string("can't open oputput file '") + CMD_outFile + "'");
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// Write header
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outFile << "//\n// Generated file - do not edit\n//\n\n";
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// Write constants
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for (auto &entry : GLOBAL_constants)
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{
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outFile << entry.outString;
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}
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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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// Close the file
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outFile.close();
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std::cout << std::string("Constants written to: ") + CMD_outFile + "\n\n";
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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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writeConstants();
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return 0;
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}
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