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rsx: Implement proper decoding for some obscure fragment instructions

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PK4UBG and UP4UBG were dropped from the NV_fragment_program spec in 2002.
Not much information about them remains but seems pretty straightforward.
This commit is contained in:
kd-11 2021-06-05 02:40:39 +03:00 • committed by kd-11
parent 11ab9b7fa9
commit 39815801aa
6 changed files with 47 additions and 8 deletions
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28
rpcs3/Emu/RSX/Program/FragmentProgramDecompiler.cpp
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@ -830,6 +830,26 @@ std::string FragmentProgramDecompiler::BuildCode()
"#define _builtin_rsq(x) (1. / _builtin_sqrt(x))\n"
"#define _builtin_div(x, y) (x / y)\n\n";
if (properties.has_pkg)
{
OS <<
"vec4 _builtin_pkg(const in vec4 value)\n"
"{\n"
" vec4 convert = linear_to_srgb(value);\n"
" return uintBitsToFloat(packUnorm4x8(convert)).xxxx;\n"
"}\n\n";
}
if (properties.has_upg)
{
OS <<
"vec4 _builtin_upg(const in float value)\n"
"{\n"
" vec4 raw = unpackUnorm4x8(floatBitsToUint(value));\n"
" return srgb_to_linear(raw);\n"
"}\n\n";
}
if (properties.has_divsq)
{
// Define RSX-compliant DIVSQ
@ -954,6 +974,9 @@ bool FragmentProgramDecompiler::handle_sct_scb(u32 opcode)
case RSX_FP_OPCODE_PK16: SetDst(getFloatTypeName(4) + "(uintBitsToFloat(packUnorm2x16($0.xy)))"); return true;
case RSX_FP_OPCODE_PKG:
// Should be similar to PKB but with gamma correction, see description of PK4UBG in khronos page
properties.has_pkg = true;
SetDst("_builtin_pkg($0)");
return true;
case RSX_FP_OPCODE_PKB: SetDst(getFloatTypeName(4) + "(uintBitsToFloat(packUnorm4x8($0)))"); return true;
case RSX_FP_OPCODE_SIN: SetDst("sin($0.xxxx)"); return true;
}
@ -1120,7 +1143,10 @@ bool FragmentProgramDecompiler::handle_tex_srb(u32 opcode)
case RSX_FP_OPCODE_UP4: SetDst("unpackSnorm4x8(floatBitsToUint($0.x))"); return true;
case RSX_FP_OPCODE_UP16: SetDst("unpackUnorm2x16(floatBitsToUint($0.x)).xyxy"); return true;
case RSX_FP_OPCODE_UPG:
// Same as UPB with gamma correction
// Same as UPB with gamma correction
properties.has_upg = true;
SetDst("_builtin_upg($0.x)");
return true;
case RSX_FP_OPCODE_UPB: SetDst("(unpackUnorm4x8(floatBitsToUint($0.x)))"); return true;
}
return false;