15 files changed, 115 insertions, 16 deletions

diff --git a/src/shader_recompiler/backend/glasm/emit_glasm_bitwise_conversion.cpp b/src/shader_recompiler/backend/glasm/emit_glasm_bitwise_conversion.cpp
index 2fc2a0ac6..5bfdecc09 100644
--- a/src/shader_recompiler/backend/glasm/emit_glasm_bitwise_conversion.cpp
+++ b/src/shader_recompiler/backend/glasm/emit_glasm_bitwise_conversion.cpp
@@ -43,6 +43,10 @@ void EmitBitCastU64F64(EmitContext&, IR::Inst& inst, const IR::Value& value) {
     Alias(inst, value);
 }
 
+void EmitBitCastS32F32(EmitContext&, IR::Inst& inst, const IR::Value& value) {
+    Alias(inst, value);
+}
+
 void EmitBitCastF16U16(EmitContext&, IR::Inst& inst, const IR::Value& value) {
     Alias(inst, value);
 }
diff --git a/src/shader_recompiler/backend/glasm/emit_glasm_instructions.h b/src/shader_recompiler/backend/glasm/emit_glasm_instructions.h
index c08f48ed9..d645fd532 100644
--- a/src/shader_recompiler/backend/glasm/emit_glasm_instructions.h
+++ b/src/shader_recompiler/backend/glasm/emit_glasm_instructions.h
@@ -196,6 +196,7 @@ void EmitSelectF64(EmitContext& ctx, ScalarS32 cond, Register true_value, Regist
 void EmitBitCastU16F16(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
 void EmitBitCastU32F32(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
 void EmitBitCastU64F64(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
+void EmitBitCastS32F32(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
 void EmitBitCastF16U16(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
 void EmitBitCastF32U32(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
 void EmitBitCastF64U64(EmitContext& ctx, IR::Inst& inst, const IR::Value& value);
diff --git a/src/shader_recompiler/backend/glsl/emit_glsl_bitwise_conversion.cpp b/src/shader_recompiler/backend/glsl/emit_glsl_bitwise_conversion.cpp
index 1be4a0f59..8e5e6cf1f 100644
--- a/src/shader_recompiler/backend/glsl/emit_glsl_bitwise_conversion.cpp
+++ b/src/shader_recompiler/backend/glsl/emit_glsl_bitwise_conversion.cpp
@@ -48,6 +48,10 @@ void EmitBitCastU64F64(EmitContext& ctx, IR::Inst& inst, std::string_view value)
     ctx.AddU64("{}=doubleBitsToUint64({});", inst, value);
 }
 
+void EmitBitCastS32F32(EmitContext& ctx, IR::Inst& inst, std::string_view value) {
+    ctx.AddF32("{}=ftoi({});", inst, value);
+}
+
 void EmitBitCastF16U16([[maybe_unused]] EmitContext& ctx, [[maybe_unused]] IR::Inst& inst) {
     NotImplemented();
 }
diff --git a/src/shader_recompiler/backend/glsl/emit_glsl_instructions.h b/src/shader_recompiler/backend/glsl/emit_glsl_instructions.h
index 3c8bcb7e9..96e683b5e 100644
--- a/src/shader_recompiler/backend/glsl/emit_glsl_instructions.h
+++ b/src/shader_recompiler/backend/glsl/emit_glsl_instructions.h
@@ -230,6 +230,7 @@ void EmitSelectF64(EmitContext& ctx, IR::Inst& inst, std::string_view cond,
 void EmitBitCastU16F16(EmitContext& ctx, IR::Inst& inst);
 void EmitBitCastU32F32(EmitContext& ctx, IR::Inst& inst, std::string_view value);
 void EmitBitCastU64F64(EmitContext& ctx, IR::Inst& inst, std::string_view value);
+void EmitBitCastS32F32(EmitContext& ctx, IR::Inst& inst, std::string_view value);
 void EmitBitCastF16U16(EmitContext& ctx, IR::Inst& inst);
 void EmitBitCastF32U32(EmitContext& ctx, IR::Inst& inst, std::string_view value);
 void EmitBitCastF64U64(EmitContext& ctx, IR::Inst& inst, std::string_view value);
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_bitwise_conversion.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_bitwise_conversion.cpp
index c4ca28d11..50daacd95 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_bitwise_conversion.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_bitwise_conversion.cpp
@@ -18,6 +18,10 @@ void EmitBitCastU64F64(EmitContext&) {
     throw NotImplementedException("SPIR-V Instruction");
 }
 
+void EmitBitCastS32F32(EmitContext&) {
+    throw NotImplementedException("SPIR-V Instruction");
+}
+
 void EmitBitCastF16U16(EmitContext&) {
     throw NotImplementedException("SPIR-V Instruction");
 }
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h b/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
index 86dd3c4f3..7070c8fda 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
@@ -178,7 +178,8 @@ Id EmitSelectF64(EmitContext& ctx, Id cond, Id true_value, Id false_value);
 void EmitBitCastU16F16(EmitContext& ctx);
 Id EmitBitCastU32F32(EmitContext& ctx, Id value);
 void EmitBitCastU64F64(EmitContext& ctx);
-void EmitBitCastF16U16(EmitContext& ctx);
+void EmitBitCastS32F32(EmitContext& ctx);
+void EmitBitCastF16U16(EmitContext&);
 Id EmitBitCastF32U32(EmitContext& ctx, Id value);
 void EmitBitCastF64U64(EmitContext& ctx);
 Id EmitPackUint2x32(EmitContext& ctx, Id value);
diff --git a/src/shader_recompiler/environment.h b/src/shader_recompiler/environment.h
index 980e0e54c..402f2664f 100644
--- a/src/shader_recompiler/environment.h
+++ b/src/shader_recompiler/environment.h
@@ -22,6 +22,8 @@ public:
 
     [[nodiscard]] virtual TextureType ReadTextureType(u32 raw_handle) = 0;
 
+    [[nodiscard]] virtual TexturePixelFormat ReadTexturePixelFormat(u32 raw_handle) = 0;
+
     [[nodiscard]] virtual u32 ReadViewportTransformState() = 0;
 
     [[nodiscard]] virtual u32 TextureBoundBuffer() const = 0;
diff --git a/src/shader_recompiler/frontend/ir/ir_emitter.cpp b/src/shader_recompiler/frontend/ir/ir_emitter.cpp
index de1ce90a3..d4425f06d 100644
--- a/src/shader_recompiler/frontend/ir/ir_emitter.cpp
+++ b/src/shader_recompiler/frontend/ir/ir_emitter.cpp
@@ -692,6 +692,11 @@ IR::U32 IREmitter::BitCast<IR::U32, IR::F32>(const IR::F32& value) {
 }
 
 template <>
+IR::S32 IREmitter::BitCast<IR::S32, IR::F32>(const IR::F32& value) {
+    return Inst<IR::S32>(Opcode::BitCastS32F32, value);
+}
+
+template <>
 IR::F32 IREmitter::BitCast<IR::F32, IR::U32>(const IR::U32& value) {
     return Inst<IR::F32>(Opcode::BitCastF32U32, value);
 }
diff --git a/src/shader_recompiler/frontend/ir/opcodes.h b/src/shader_recompiler/frontend/ir/opcodes.h
index 752879a18..e70d7745c 100644
--- a/src/shader_recompiler/frontend/ir/opcodes.h
+++ b/src/shader_recompiler/frontend/ir/opcodes.h
@@ -37,6 +37,7 @@ constexpr Type U8{Type::U8};
 constexpr Type U16{Type::U16};
 constexpr Type U32{Type::U32};
 constexpr Type U64{Type::U64};
+constexpr Type S32{Type::S32};
 constexpr Type F16{Type::F16};
 constexpr Type F32{Type::F32};
 constexpr Type F64{Type::F64};
diff --git a/src/shader_recompiler/frontend/ir/opcodes.inc b/src/shader_recompiler/frontend/ir/opcodes.inc
index f3038f298..88aa077ee 100644
--- a/src/shader_recompiler/frontend/ir/opcodes.inc
+++ b/src/shader_recompiler/frontend/ir/opcodes.inc
@@ -174,6 +174,7 @@ OPCODE(SelectF64,                                           F64,            U1,
 OPCODE(BitCastU16F16,                                       U16,            F16,                                                                            )
 OPCODE(BitCastU32F32,                                       U32,            F32,                                                                            )
 OPCODE(BitCastU64F64,                                       U64,            F64,                                                                            )
+OPCODE(BitCastS32F32,                                       S32,            F32,                                                                            )
 OPCODE(BitCastF16U16,                                       F16,            U16,                                                                            )
 OPCODE(BitCastF32U32,                                       F32,            U32,                                                                            )
 OPCODE(BitCastF64U64,                                       F64,            U64,                                                                            )
diff --git a/src/shader_recompiler/frontend/ir/type.h b/src/shader_recompiler/frontend/ir/type.h
index 04c8c4ddb..5a7c706ad 100644
--- a/src/shader_recompiler/frontend/ir/type.h
+++ b/src/shader_recompiler/frontend/ir/type.h
@@ -24,21 +24,22 @@ enum class Type {
     U16 = 1 << 7,
     U32 = 1 << 8,
     U64 = 1 << 9,
-    F16 = 1 << 10,
-    F32 = 1 << 11,
-    F64 = 1 << 12,
-    U32x2 = 1 << 13,
-    U32x3 = 1 << 14,
-    U32x4 = 1 << 15,
-    F16x2 = 1 << 16,
-    F16x3 = 1 << 17,
-    F16x4 = 1 << 18,
-    F32x2 = 1 << 19,
-    F32x3 = 1 << 20,
-    F32x4 = 1 << 21,
-    F64x2 = 1 << 22,
-    F64x3 = 1 << 23,
-    F64x4 = 1 << 24,
+    S32 = 1 << 10,
+    F16 = 1 << 11,
+    F32 = 1 << 12,
+    F64 = 1 << 13,
+    U32x2 = 1 << 14,
+    U32x3 = 1 << 15,
+    U32x4 = 1 << 16,
+    F16x2 = 1 << 17,
+    F16x3 = 1 << 18,
+    F16x4 = 1 << 19,
+    F32x2 = 1 << 20,
+    F32x3 = 1 << 21,
+    F32x4 = 1 << 22,
+    F64x2 = 1 << 23,
+    F64x3 = 1 << 24,
+    F64x4 = 1 << 25,
 };
 DECLARE_ENUM_FLAG_OPERATORS(Type)
 
diff --git a/src/shader_recompiler/frontend/ir/value.cpp b/src/shader_recompiler/frontend/ir/value.cpp
index 346169328..30ba12316 100644
--- a/src/shader_recompiler/frontend/ir/value.cpp
+++ b/src/shader_recompiler/frontend/ir/value.cpp
@@ -23,6 +23,8 @@ Value::Value(u16 value) noexcept : type{Type::U16}, imm_u16{value} {}
 
 Value::Value(u32 value) noexcept : type{Type::U32}, imm_u32{value} {}
 
+Value::Value(s32 value) noexcept : type{Type::S32}, imm_s32{value} {}
+
 Value::Value(f32 value) noexcept : type{Type::F32}, imm_f32{value} {}
 
 Value::Value(u64 value) noexcept : type{Type::U64}, imm_u64{value} {}
@@ -69,6 +71,7 @@ bool Value::operator==(const Value& other) const {
         return imm_u16 == other.imm_u16;
     case Type::U32:
     case Type::F32:
+    case Type::S32:
         return imm_u32 == other.imm_u32;
     case Type::U64:
     case Type::F64:
diff --git a/src/shader_recompiler/frontend/ir/value.h b/src/shader_recompiler/frontend/ir/value.h
index 6a673ca05..e8bbb93a5 100644
--- a/src/shader_recompiler/frontend/ir/value.h
+++ b/src/shader_recompiler/frontend/ir/value.h
@@ -44,6 +44,7 @@ public:
     explicit Value(u8 value) noexcept;
     explicit Value(u16 value) noexcept;
     explicit Value(u32 value) noexcept;
+    explicit Value(s32 value) noexcept;
     explicit Value(f32 value) noexcept;
     explicit Value(u64 value) noexcept;
     explicit Value(f64 value) noexcept;
@@ -66,6 +67,7 @@ public:
     [[nodiscard]] u8 U8() const;
     [[nodiscard]] u16 U16() const;
     [[nodiscard]] u32 U32() const;
+    [[nodiscard]] s32 S32() const;
     [[nodiscard]] f32 F32() const;
     [[nodiscard]] u64 U64() const;
     [[nodiscard]] f64 F64() const;
@@ -85,6 +87,7 @@ private:
         u8 imm_u8;
         u16 imm_u16;
         u32 imm_u32;
+        s32 imm_s32;
         f32 imm_f32;
         u64 imm_u64;
         f64 imm_f64;
@@ -266,6 +269,7 @@ using U8 = TypedValue<Type::U8>;
 using U16 = TypedValue<Type::U16>;
 using U32 = TypedValue<Type::U32>;
 using U64 = TypedValue<Type::U64>;
+using S32 = TypedValue<Type::S32>;
 using F16 = TypedValue<Type::F16>;
 using F32 = TypedValue<Type::F32>;
 using F64 = TypedValue<Type::F64>;
@@ -377,6 +381,14 @@ inline u32 Value::U32() const {
     return imm_u32;
 }
 
+inline s32 Value::S32() const {
+    if (IsIdentity()) {
+        return inst->Arg(0).S32();
+    }
+    DEBUG_ASSERT(type == Type::S32);
+    return imm_s32;
+}
+
 inline f32 Value::F32() const {
     if (IsIdentity()) {
         return inst->Arg(0).F32();
diff --git a/src/shader_recompiler/ir_opt/texture_pass.cpp b/src/shader_recompiler/ir_opt/texture_pass.cpp
index e8be58357..9eff84a3d 100644
--- a/src/shader_recompiler/ir_opt/texture_pass.cpp
+++ b/src/shader_recompiler/ir_opt/texture_pass.cpp
@@ -7,6 +7,7 @@
 
 #include <boost/container/small_vector.hpp>
 
+#include "common/settings.h"
 #include "shader_recompiler/environment.h"
 #include "shader_recompiler/frontend/ir/basic_block.h"
 #include "shader_recompiler/frontend/ir/breadth_first_search.h"
@@ -363,6 +364,14 @@ TextureType ReadTextureType(Environment& env, const ConstBufferAddr& cbuf) {
     return env.ReadTextureType(lhs_raw | rhs_raw);
 }
 
+TexturePixelFormat ReadTexturePixelFormat(Environment& env, const ConstBufferAddr& cbuf) {
+    const u32 secondary_index{cbuf.has_secondary ? cbuf.secondary_index : cbuf.index};
+    const u32 secondary_offset{cbuf.has_secondary ? cbuf.secondary_offset : cbuf.offset};
+    const u32 lhs_raw{env.ReadCbufValue(cbuf.index, cbuf.offset)};
+    const u32 rhs_raw{env.ReadCbufValue(secondary_index, secondary_offset)};
+    return env.ReadTexturePixelFormat(lhs_raw | rhs_raw);
+}
+
 class Descriptors {
 public:
     explicit Descriptors(TextureBufferDescriptors& texture_buffer_descriptors_,
@@ -451,6 +460,38 @@ void PatchImageSampleImplicitLod(IR::Block& block, IR::Inst& inst) {
                ir.FPMul(IR::F32(ir.CompositeExtract(coord, 1)),
                         ir.FPRecip(ir.ConvertUToF(32, 32, ir.CompositeExtract(texture_size, 1))))));
 }
+
+void PathTexelFetch(IR::Block& block, IR::Inst& inst, TexturePixelFormat pixel_format) {
+    const auto it{IR::Block::InstructionList::s_iterator_to(inst)};
+    IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
+    auto get_max_value = [pixel_format]() -> float {
+        switch (pixel_format) {
+        case TexturePixelFormat::A8B8G8R8_SNORM:
+        case TexturePixelFormat::R8G8_SNORM:
+        case TexturePixelFormat::R8_SNORM:
+            return 1.f / std::numeric_limits<char>::max();
+        case TexturePixelFormat::R16G16B16A16_SNORM:
+        case TexturePixelFormat::R16G16_SNORM:
+        case TexturePixelFormat::R16_SNORM:
+            return 1.f / std::numeric_limits<short>::max();
+        default:
+            throw InvalidArgument("Invalid texture pixel format");
+        }
+    };
+
+    const IR::Value new_inst{&*block.PrependNewInst(it, inst)};
+    const IR::F32 x(ir.CompositeExtract(new_inst, 0));
+    const IR::F32 y(ir.CompositeExtract(new_inst, 1));
+    const IR::F32 z(ir.CompositeExtract(new_inst, 2));
+    const IR::F32 w(ir.CompositeExtract(new_inst, 3));
+    const IR::F16F32F64 max_value(ir.Imm32(get_max_value()));
+    const IR::Value converted =
+        ir.CompositeConstruct(ir.FPMul(ir.ConvertSToF(32, 32, ir.BitCast<IR::S32>(x)), max_value),
+                              ir.FPMul(ir.ConvertSToF(32, 32, ir.BitCast<IR::S32>(y)), max_value),
+                              ir.FPMul(ir.ConvertSToF(32, 32, ir.BitCast<IR::S32>(z)), max_value),
+                              ir.FPMul(ir.ConvertSToF(32, 32, ir.BitCast<IR::S32>(w)), max_value));
+    inst.ReplaceUsesWith(converted);
+}
 } // Anonymous namespace
 
 void TexturePass(Environment& env, IR::Program& program) {
@@ -597,6 +638,14 @@ void TexturePass(Environment& env, IR::Program& program) {
         } else {
             inst->SetArg(0, IR::Value{});
         }
+
+        if (Settings::values.renderer_backend.GetValue() == Settings::RendererBackend::OpenGL &&
+            inst->GetOpcode() == IR::Opcode::ImageFetch && flags.type == TextureType::Buffer) {
+            const auto pixel_format = ReadTexturePixelFormat(env, cbuf);
+            if (pixel_format != TexturePixelFormat::OTHER) {
+                PathTexelFetch(*texture_inst.block, *texture_inst.inst, pixel_format);
+            }
+        }
     }
 }
 
diff --git a/src/shader_recompiler/shader_info.h b/src/shader_recompiler/shader_info.h
index a479e105e..f31e1f821 100644
--- a/src/shader_recompiler/shader_info.h
+++ b/src/shader_recompiler/shader_info.h
@@ -29,6 +29,16 @@ enum class TextureType : u32 {
 };
 constexpr u32 NUM_TEXTURE_TYPES = 9;
 
+enum class TexturePixelFormat : u32 {
+    A8B8G8R8_SNORM,
+    R8_SNORM,
+    R8G8_SNORM,
+    R16G16B16A16_SNORM,
+    R16G16_SNORM,
+    R16_SNORM,
+    OTHER
+};
+
 enum class ImageFormat : u32 {
     Typeless,
     R8_UINT,