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spirv: Implement rescaling patching

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This commit is contained in:
ReinUsesLisp 2021-07-25 22:26:23 -03:00 • committed by Fernando Sahmkow
parent 01379c5e3c
commit 656adee630
8 changed files with 86 additions and 5 deletions
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26
src/shader_recompiler/backend/spirv/emit_spirv_image.cpp
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@ -470,8 +470,30 @@ void EmitImageWrite(EmitContext& ctx, IR::Inst* inst, const IR::Value& index, Id
ctx.OpImageWrite(Image(ctx, index, info), coords, color);
}
Id EmitIsTextureScaled([[maybe_unused]] EmitContext& ctx, [[maybe_unused]] const IR::Value& index) {
return ctx.false_value;
Id EmitIsTextureScaled(EmitContext& ctx, const IR::Value& index) {
const Id push_constant_u32{ctx.TypePointer(spv::StorageClass::PushConstant, ctx.U32[1])};
const Id member_index{ctx.Const(ctx.rescaling_textures_member_index)};
Id bit{};
if (index.IsImmediate()) {
// Use BitwiseAnd instead of BitfieldExtract for better codegen on Nvidia OpenGL.
// LOP32I.NZ is used to set the predicate rather than BFE+ISETP.
const u32 index_value{index.U32()};
const Id word_index{ctx.Const(index_value / 32)};
const Id bit_index_mask{ctx.Const(1u << (index_value % 32))};
const Id pointer{ctx.OpAccessChain(push_constant_u32, ctx.rescaling_push_constants,
member_index, word_index)};
const Id word{ctx.OpLoad(ctx.U32[1], pointer)};
bit = ctx.OpBitwiseAnd(ctx.U32[1], word, bit_index_mask);
} else {
const Id index_value{ctx.Def(index)};
const Id word_index{ctx.OpShiftRightArithmetic(ctx.U32[1], index_value, ctx.Const(5u))};
const Id pointer{ctx.OpAccessChain(push_constant_u32, ctx.rescaling_push_constants,
member_index, word_index)};
const Id word{ctx.OpLoad(ctx.U32[1], pointer)};
const Id bit_index{ctx.OpBitwiseAnd(ctx.U32[1], index_value, ctx.Const(31u))};
bit = ctx.OpBitFieldUExtract(ctx.U32[1], index_value, bit_index, ctx.Const(1u));
}
return ctx.OpINotEqual(ctx.U1, bit, ctx.u32_zero_value);
}
} // namespace Shader::Backend::SPIRV