Add dx2cg

dx2cg/README.md

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+# dx2cg
+Tools for converting d3d9 shader assembly to HLSL/Cg.
+- `disassembler.py`: Takes in d3d9 assembly and gives back the HLSL equivalent.
+- `swapper.py`: Searches a shader file for d3d9 assembly and calls the disassembler to replace it with HLSL.
+- `main.py`: Executes the swapper on every file in a path, writing the changes to new files.
+
+## Known issues
+- Only vertex shaders with profile `vs_1_1` are supported
+- No fragment shaders are supported yet
+- Only a limited set of instructions (those used by FF and Unity 2.6) are supported

dx2cg/disassembler.py

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+#!/usr/bin/env python
+# coding: utf-8
+# d3d9 to cg crude dissassembler
+# ycc 08/08/2022
+
+import re
+
+legacy = False # True for 2.6
+
+reserved = {
+    "_Time",
+    "_SinTime",
+    "_CosTime",
+    
+    "_ProjectionParams",
+    
+    "_PPLAmbient",
+    
+    "_ObjectSpaceCameraPos",
+    "_ObjectSpaceLightPos0",
+    "_ModelLightColor0",
+    "_SpecularLightColor0",
+    
+    "_Light2World0", "_World2Light0", "_Object2World", "_World2Object", "_Object2Light0",
+    
+    "_LightDirectionBias",
+    "_LightPositionRange",
+}
+
+decls = {
+    "dcl_position": "float4 {0} = vardat.vertex;",
+    "dcl_normal": "float4 {0} = float4(vardat.normal.x, vardat.normal.y, vardat.normal.z, 0);",
+    "dcl_texcoord0": "float4 {0} = vardat.texcoord;",
+    "dcl_texcoord1": "float4 {0} = vardat.texcoord1;",
+    "dcl_color": "float4 {0} = vardat.color;",
+    "def": "const float4 {0} = float4({1}, {2}, {3}, {4});",
+}
+
+ops = {
+    "mov": "{0} = {1};",
+    "add": "{0} = {1} + {2};",
+    "mul": "{0} = {1} * {2};",
+    "mad": "{0} = {1} * {2} + {3};",
+    "dp4": "{0} = dot((float4){1}, (float4){2});",
+    "dp3": "{0} = dot((float3){1}, (float3){2});",
+    "min": "{0} = min({1}, {2});",
+    "max": "{0} = max({1}, {2});",
+    "rsq": "{0} = rsqrt({1});",
+    "frc": "{0} = float4({1}.x - (float)floor({1}.x), {1}.y - (float)floor({1}.y), {1}.z - (float)floor({1}.z), {1}.w - (float)floor({1}.w));",
+    "slt": "{0} = float4(({1}.x < {2}.x) ? 1.0f : 0.0f, ({1}.y < {2}.y) ? 1.0f : 0.0f, ({1}.z < {2}.z) ? 1.0f : 0.0f, ({1}.w < {2}.w) ? 1.0f : 0.0f);",
+    "sge": "{0} = float4(({1}.x >= {2}.x) ? 1.0f : 0.0f, ({1}.y >= {2}.y) ? 1.0f : 0.0f, ({1}.z >= {2}.z) ? 1.0f : 0.0f, ({1}.w >= {2}.w) ? 1.0f : 0.0f);",
+    "rcp": "{0} = ({1} == 0.0f) ? FLT_MAX : (({1} == 1.0f) ? {0} : (1 / {1}));",
+}
+
+struct_appdata = """struct appdata {
+\tfloat4 vertex : POSITION;
+\tfloat3 normal : NORMAL;
+\tfloat4 texcoord : TEXCOORD0;
+\tfloat4 texcoord1 : TEXCOORD1;
+\tfloat4 tangent : TANGENT;
+\tfloat4 color : COLOR;
+};
+"""
+
+v2f_postype = "POSITION" if legacy else "SV_POSITION"
+struct_v2f = f"""struct v2f {{
+\tfloat4 pos : {v2f_postype};
+\tfloat4 t0 : TEXCOORD0;
+\tfloat4 t1 : TEXCOORD1;
+\tfloat4 t2 : TEXCOORD2;
+\tfloat4 t3 : TEXCOORD3;
+\tfloat fog : FOG;
+\tfloat4 d0 : COLOR0;
+\tfloat4 d1 : COLOR1;
+}};
+"""
+
+cg_header = """CGPROGRAM
+#include "UnityCG.cginc"
+#pragma exclude_renderers xbox360 ps3 gles
+"""
+
+cg_footer = """ENDCG"""
+
+vertex_header = """v2f vert(appdata vardat) {
+\tfloat4 r0, r1, r2, r3, r4;
+\tfloat4 tmp;
+\tv2f o;
+"""
+
+vertex_footer = """\treturn o;
+}"""
+
+def process_header(prog):
+    keywords = []
+    header = []
+    loctab = {}
+    locdecl = []
+    binds = []
+    i = 0
+    lighting = False
+    while i < len(prog):
+        line = prog[i]
+        if line.startswith("Keywords"):
+            keywords = re.findall("\"[\w\d]+\"", line)
+            del prog[i]
+            i = i - 1
+        elif line.startswith("Bind"):
+            binds.append(line)
+            del prog[i]
+            i = i - 1
+        elif line.startswith("Local") or line.startswith("Matrix"):
+            dec = line.split(' ')
+            key = int(dec[1][:-1])
+            if dec[2][0] == '[':
+                # singleton
+                val = dec[2][1:-1]
+                if val[0] == '_' and val not in reserved:
+                    loctype = "float4" if dec[0] == "Local" else "float4x4"
+                    locdecl.append(f"{loctype} {val};")
+            elif dec[2][0] == '(':
+                #components
+                vals = dec[2][1:-1].split(',')
+                for j, v in enumerate(vals):
+                    if v[0] == '[':
+                        vals[j] = v[1:-1]
+                        if vals[j][0] == '_' and vals[j] not in reserved:
+                            locdecl.append(f"float {vals[j]};")
+                val = f"float4({vals[0]},{vals[1]},{vals[2]},{vals[3]})"
+            
+            lightval = re.match("glstate_light(\d)_([a-zA-Z]+)", val)
+            if lightval:
+                val = f"glstate.light[{lightval[1]}].{lightval[2]}"
+                lighting = True
+            elif val == "glstate_lightmodel_ambient":
+                val = "glstate.lightmodel.ambient"
+                lighting = True
+            elif val.startswith("glstate_matrix_texture"):
+                val = f"glstate.matrix.texture[{val[-1]}]" if legacy else f"UNITY_MATRIX_TEXTURE{val[-1]}"
+            elif val == "glstate_matrix_mvp":
+                val = "glstate.matrix.mvp" if legacy else "UNITY_MATRIX_MVP"
+            elif val == "glstate_matrix_modelview0":
+                val = "glstate.matrix.modelview[0]" if legacy else "UNITY_MATRIX_MV"
+            elif val == "glstate_matrix_transpose_modelview0":
+                val = "glstate.matrix.transpose.modelview[0]" if legacy else "UNITY_MATRIX_T_MV"
+            elif val == "glstate_matrix_invtrans_modelview0":
+                val = "glstate.matrix.invtrans.modelview[0]" if legacy else "UNITY_MATRIX_IT_MV"
+            elif val.startswith("glstate"):
+                raise ValueError(f"Unrecognized glstate: {val}")
+                
+            if dec[0] == "Local":
+                loctab[key] = val
+            elif dec[0] == "Matrix":
+                for offset in range(0,4):
+                    loctab[key + offset] = f"{val}[{offset}]"
+            
+            del prog[i]
+            i = i - 1
+        i = i + 1
+        
+    if len(binds) > 0:
+        header.append("BindChannels {")
+        for b in binds:
+            header.append(f"\t{b}")
+        header.append("}")
+    
+    if lighting:
+        header.append("Lighting On")
+    
+    return (keywords, header, loctab, locdecl)
+
+def resolve_args(args, loctab, consts):
+    for a in range(0, len(args)):
+        arg = args[a]
+        
+        neg = ""
+        if arg[0] == '-':
+            arg = arg[1:]
+            neg = "-"
+        
+        # save swizzler!
+        dot = arg.find(".")
+        if dot > -1:
+            swiz = arg[dot:]
+            arg = arg[:dot]
+        else:
+            swiz = ""
+        
+        if arg[0] == 'r':
+            pass
+        elif arg[0] == 'v':
+            pass
+        elif arg[0] == 'c':
+            if arg not in consts:
+                key = int(arg[1:])
+                arg = loctab[key]
+        elif arg[0] == 'o':
+            arg = f"o.{arg[1:].lower()}"
+        elif re.match("[+-]?([0-9]*[.])?[0-9]+", arg):
+            pass
+        else:
+            raise ValueError(f"Unknown arg {arg}")
+        
+        args[a] = neg + arg + swiz
+
+def decode(code, args):
+    if code in decls:
+        return [decls[code].format(*args)]
+    elif code in ops:
+        target = args[0]
+        if target == "o.fog":
+            return [ops[code].format(*args)]
+        
+        dot = re.search("\.[xyzw]+", target)
+        if dot:
+            swiz = target[dot.start()+1:]
+            target = target[:dot.start()]
+        else:
+            swiz = "xyzw"
+        
+        lines = [ops[code].format("tmp", *args[1:])]
+        for c in swiz:
+            lines.append(f"{target}.{c} = tmp.{c};")
+        return lines
+    else:
+        raise ValueError(f"Unknown code {code}")
+
+def process_asm(asm, loctab):
+    shadertype = ""
+    if asm[0] == "\"vs_1_1":
+        shadertype = "vertex"
+    else:
+        raise ValueError(f"Unsupported shader type: {asm[0][1:]}")
+    
+    consts = set()
+    translated = []
+    i = 1
+    while i < len(asm):
+        instruction = asm[i]
+        if instruction == "\"":
+            break
+        
+        space = instruction.find(" ")
+        if space == -1:
+            code = instruction
+            args = []
+        else:
+            code = instruction[:space]
+            args = instruction[space+1:].split(", ")
+
+        if code == "def":
+            consts.add(args[0])
+            
+        resolve_args(args, loctab, consts)
+        disasm = decode(code, args)
+        # print(f"{instruction} \t==>\t{disasm}")
+        disasm.insert(0, f"// {instruction}")
+        translated.extend(disasm)
+        i = i + 1
+    
+    return (shadertype, translated)
+
+def disassemble(text):
+    asm = text.split('\n')[1:-1]
+    (keywords, header, loctab, locdecl) = process_header(asm)
+    (shadertype, disasm) = process_asm(asm, loctab)
+    
+    text = "\n".join(header) + "\n"
+    text += cg_header
+    if keywords:
+        text += "#pragma multi_compile " + " ".join(keywords)
+    if shadertype == "vertex":
+        text += "#pragma vertex vert\n\n"
+        text += struct_appdata + "\n"
+        text += struct_v2f + "\n"
+    text += "\n".join(locdecl) + "\n"
+    if shadertype == "vertex":
+        text += vertex_header + "\n"
+    text += "\t" + "\n\t".join(disasm) + "\n\n"
+    if shadertype == "vertex":
+        text += vertex_footer + "\n"
+    text += cg_footer
+    return text

dx2cg/main.py

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+#!/usr/bin/env python
+# coding: utf-8
+
+import os
+import sys
+from swapper import process
+
+def process_file(filename, suffix):
+    dot = filename.rfind(".")
+    if dot > -1:
+        outfile_name = filename[:dot] + suffix + filename[dot:]
+    else:
+        outfile_name = filename + suffix
+    return process(filename, outfile_name)
+
+def process_batch(path, suffix="_hlsl"):
+    files = os.listdir(path)
+    for f in files:
+        if os.path.isdir(f):
+            process_batch(f"{path}/{f}")
+        else:
+            try:
+                if process_file(f"{path}/{f}", suffix):
+                    print(f"Processed {f}")
+                else:
+                    print(f"Skipping {f}")
+            except ValueError as err:
+                print(f"Failed to process {f}: {err}")
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("Usage: <shader-path> [outfile-suffix]")
+    elif len(sys.argv) == 2:
+        process_batch(sys.argv[1])
+    else:
+        process_batch(*sys.argv[1:2])
+

dx2cg/swapper.py

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+#!/usr/bin/env python
+# coding: utf-8
+# parser for replacing d3d9 subprograms in shaderlab files with HLSL/CG
+# ycc 08/08/2022
+
+import re
+from disassembler import disassemble
+
+tabs = 3
+def indent(block):
+    lines = block.split('\n')
+    for i in range(0, len(lines)-1):
+        lines[i] = tabs * "\t" + lines[i]
+    return "\n".join(lines)
+
+def find_closing_bracket(block, i):
+    count = 0;
+    while i < len(block):
+        if block[i] == '{':
+            count = count + 1
+        if block[i] == '}':
+            count = count - 1
+            if count == 0:
+                return i
+        i = i + 1
+    raise ValueError(f"Block at {i} has no closing bracket")
+
+def process_program(prog):
+    subprog_index = prog.find("SubProgram \"d3d9")
+    if subprog_index == -1:
+        raise ValueError(f"Program has no d3d9 subprogram")
+    subprog_end_index = find_closing_bracket(prog, subprog_index)
+    subprog = prog[subprog_index:subprog_end_index+1]
+    processed = disassemble(subprog) + "\n"
+    return indent(processed)
+
+def process_shader(shader):
+    buf = shader
+    processed = ''
+    program_index = buf.find('Program')
+    while program_index > -1:
+        processed = processed + buf[:program_index]
+        buf = buf[program_index:]
+        line = re.search("#LINE [0-9]+\n", buf)
+        if not line:
+            raise ValueError(f"Program at {program_index} has no #LINE marker")
+        end_index = line.end() + 1
+        program_section = buf[program_index:end_index+1]
+        processed = processed + process_program(program_section)
+        buf = buf[end_index+1:]
+        
+        program_index = buf.find('Program')
+    processed = processed + buf
+    return processed
+
+def process(fn_in, fn_out):
+    with open(fn_in, "r") as fi:
+        buf = fi.read()
+        processed = process_shader(buf)
+    if buf != processed:
+        with open(fn_out, "w") as fo:
+            fo.write(processed)
+        return True
+    return False