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Merge pull request #521 from Subv/bra

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GPU: Corrected the branch targets for the shader bra instruction.
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bunnei 2018-06-05 10:09:35 -04:00 committed by GitHub
commit 38eb33f150
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1 changed files with 5 additions and 4 deletions
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src/video_core/engines/shader_bytecode.h
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@ -325,15 +325,16 @@ union Instruction {
} texs; } texs;
union { union {
BitField<20, 5, u64> target; BitField<20, 24, u64> target;
BitField<5, 1, u64> constant_buffer; BitField<5, 1, u64> constant_buffer;
s32 GetBranchTarget() const { s32 GetBranchTarget() const {
// Sign extend the branch target offset // Sign extend the branch target offset
u32 mask = 1U << (5 - 1); u32 mask = 1U << (24 - 1);
u32 value = static_cast<u32>(target); u32 value = static_cast<u32>(target);
// The branch offset is relative to the next instruction, so add 1 to it. // The branch offset is relative to the next instruction and is stored in bytes, so
return static_cast<s32>((value ^ mask) - mask) + 1; // divide it by the size of an instruction and add 1 to it.
return static_cast<s32>((value ^ mask) - mask) / sizeof(Instruction) + 1;
} }
} bra; } bra;