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[shader_recompiler/ Maxwell] ISBERD initial implementation

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Adds the initial support for Internal Stage Buffer Entry Read - ISBERD, a mechanism used to read internal stage buffer entries with accurate per-stage synchronization. This enables more precise tracking of GPU buffer accesses, improving compatibility with games relying on fine-grained intermediate rendering stages (especially UE4 titles and post-processing heavy engines).

Reviewed-on: eden-emu/eden#124
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>
This commit is contained in:
lizzie 2025-07-25 04:38:50 +02:00 • committed by crueter
parent 7617f743f9
commit bdfcb6c950
Signed by untrusted user: crueter
GPG key ID: 425ACD2D4830EBC6
1 changed files with 11 additions and 2 deletions
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13
src/shader_recompiler/frontend/maxwell/translate/impl/internal_stage_buffer_entry_read.cpp
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@ -22,11 +22,14 @@ enum class Shift : u64 {
} // Anonymous namespace
// Valid only for GS, TI, VS and trap
void TranslatorVisitor::ISBERD(u64 insn) {
union {
u64 raw;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> src_reg;
BitField<8, 8, u32> src_reg_num;
BitField<24, 8, u32> imm;
BitField<31, 1, u64> skew;
BitField<32, 1, u64> o;
BitField<33, 2, Mode> mode;
@ -45,8 +48,14 @@ void TranslatorVisitor::ISBERD(u64 insn) {
if (isberd.shift != Shift::Default) {
throw NotImplementedException("Shift {}", isberd.shift.Value());
}
LOG_WARNING(Shader, "(STUBBED) called");
X(isberd.dest_reg, X(isberd.src_reg));
//LOG_DEBUG(Shader, "(STUBBED) called {}", insn);
if (isberd.src_reg_num == 0xFF) {
IR::U32 src_imm{ir.Imm32(static_cast<u32>(isberd.imm))};
IR::U32 result{ir.IAdd(X(isberd.src_reg), src_imm)};
X(isberd.dest_reg, result);
} else {
X(isberd.dest_reg, X(isberd.src_reg));
}
}
} // namespace Shader::Maxwell