5 files changed, 120 insertions, 56 deletions

diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h
index d6a2cc8b8..1cb0ac0c2 100644
--- a/src/video_core/engines/shader_bytecode.h
+++ b/src/video_core/engines/shader_bytecode.h
@@ -1239,7 +1239,7 @@ union Instruction {
         BitField<35, 1, u64> ndv_flag;
         BitField<49, 1, u64> nodep_flag;
         BitField<50, 1, u64> dc_flag;
-        BitField<54, 2, u64> info;
+        BitField<54, 2, u64> offset_mode;
         BitField<56, 2, u64> component;
 
         bool UsesMiscMode(TextureMiscMode mode) const {
@@ -1251,9 +1251,9 @@ union Instruction {
             case TextureMiscMode::DC:
                 return dc_flag != 0;
             case TextureMiscMode::AOFFI:
-                return info == 1;
+                return offset_mode == 1;
             case TextureMiscMode::PTP:
-                return info == 2;
+                return offset_mode == 2;
             default:
                 break;
             }
@@ -1265,7 +1265,7 @@ union Instruction {
         BitField<35, 1, u64> ndv_flag;
         BitField<49, 1, u64> nodep_flag;
         BitField<50, 1, u64> dc_flag;
-        BitField<33, 2, u64> info;
+        BitField<33, 2, u64> offset_mode;
         BitField<37, 2, u64> component;
 
         bool UsesMiscMode(TextureMiscMode mode) const {
@@ -1277,9 +1277,9 @@ union Instruction {
             case TextureMiscMode::DC:
                 return dc_flag != 0;
             case TextureMiscMode::AOFFI:
-                return info == 1;
+                return offset_mode == 1;
             case TextureMiscMode::PTP:
-                return info == 2;
+                return offset_mode == 2;
             default:
                 break;
             }
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
index 6b4b8ff67..83a6769ae 100644
--- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -48,10 +48,10 @@ class ExprDecompiler;
 
 enum class Type { Void, Bool, Bool2, Float, Int, Uint, HalfFloat };
 
-struct TextureAoffi {};
+struct TextureOffset {};
 struct TextureDerivates {};
 using TextureArgument = std::pair<Type, Node>;
-using TextureIR = std::variant<TextureAoffi, TextureDerivates, TextureArgument>;
+using TextureIR = std::variant<TextureOffset, TextureDerivates, TextureArgument>;
 
 constexpr u32 MAX_CONSTBUFFER_ELEMENTS =
     static_cast<u32>(Maxwell::MaxConstBufferSize) / (4 * sizeof(float));
@@ -1089,6 +1089,8 @@ private:
         std::string expr = "texture" + function_suffix;
         if (!meta->aoffi.empty()) {
             expr += "Offset";
+        } else if (!meta->ptp.empty()) {
+            expr += "Offsets";
         }
         expr += '(' + GetSampler(meta->sampler) + ", ";
         expr += coord_constructors.at(count + (has_array ? 1 : 0) +
@@ -1117,8 +1119,12 @@ private:
         for (const auto& variant : extras) {
             if (const auto argument = std::get_if<TextureArgument>(&variant)) {
                 expr += GenerateTextureArgument(*argument);
-            } else if (std::holds_alternative<TextureAoffi>(variant)) {
-                expr += GenerateTextureAoffi(meta->aoffi);
+            } else if (std::holds_alternative<TextureOffset>(variant)) {
+                if (!meta->aoffi.empty()) {
+                    expr += GenerateTextureAoffi(meta->aoffi);
+                } else if (!meta->ptp.empty()) {
+                    expr += GenerateTexturePtp(meta->ptp);
+                }
             } else if (std::holds_alternative<TextureDerivates>(variant)) {
                 expr += GenerateTextureDerivates(meta->derivates);
             } else {
@@ -1159,6 +1165,20 @@ private:
         return expr;
     }
 
+    std::string ReadTextureOffset(const Node& value) {
+        if (const auto immediate = std::get_if<ImmediateNode>(&*value)) {
+            // Inline the string as an immediate integer in GLSL (AOFFI arguments are required
+            // to be constant by the standard).
+            return std::to_string(static_cast<s32>(immediate->GetValue()));
+        } else if (device.HasVariableAoffi()) {
+            // Avoid using variable AOFFI on unsupported devices.
+            return Visit(value).AsInt();
+        } else {
+            // Insert 0 on devices not supporting variable AOFFI.
+            return "0";
+        }
+    }
+
     std::string GenerateTextureAoffi(const std::vector<Node>& aoffi) {
         if (aoffi.empty()) {
             return {};
@@ -1169,18 +1189,7 @@ private:
         expr += '(';
 
         for (std::size_t index = 0; index < aoffi.size(); ++index) {
-            const auto operand{aoffi.at(index)};
-            if (const auto immediate = std::get_if<ImmediateNode>(&*operand)) {
-                // Inline the string as an immediate integer in GLSL (AOFFI arguments are required
-                // to be constant by the standard).
-                expr += std::to_string(static_cast<s32>(immediate->GetValue()));
-            } else if (device.HasVariableAoffi()) {
-                // Avoid using variable AOFFI on unsupported devices.
-                expr += Visit(operand).AsInt();
-            } else {
-                // Insert 0 on devices not supporting variable AOFFI.
-                expr += '0';
-            }
+            expr += ReadTextureOffset(aoffi.at(index));
             if (index + 1 < aoffi.size()) {
                 expr += ", ";
             }
@@ -1190,6 +1199,20 @@ private:
         return expr;
     }
 
+    std::string GenerateTexturePtp(const std::vector<Node>& ptp) {
+        static constexpr std::size_t num_vectors = 4;
+        ASSERT(ptp.size() == num_vectors * 2);
+
+        std::string expr = ", ivec2[](";
+        for (std::size_t vector = 0; vector < num_vectors; ++vector) {
+            const bool has_next = vector + 1 < num_vectors;
+            expr += fmt::format("ivec2({}, {}){}", ReadTextureOffset(ptp.at(vector * 2)),
+                                ReadTextureOffset(ptp.at(vector * 2 + 1)), has_next ? ", " : "");
+        }
+        expr += ')';
+        return expr;
+    }
+
     std::string GenerateTextureDerivates(const std::vector<Node>& derivates) {
         if (derivates.empty()) {
             return {};
@@ -1688,7 +1711,7 @@ private:
         ASSERT(meta);
 
         std::string expr = GenerateTexture(
-            operation, "", {TextureAoffi{}, TextureArgument{Type::Float, meta->bias}});
+            operation, "", {TextureOffset{}, TextureArgument{Type::Float, meta->bias}});
         if (meta->sampler.IsShadow()) {
             expr = "vec4(" + expr + ')';
         }
@@ -1700,7 +1723,7 @@ private:
         ASSERT(meta);
 
         std::string expr = GenerateTexture(
-            operation, "Lod", {TextureArgument{Type::Float, meta->lod}, TextureAoffi{}});
+            operation, "Lod", {TextureArgument{Type::Float, meta->lod}, TextureOffset{}});
         if (meta->sampler.IsShadow()) {
             expr = "vec4(" + expr + ')';
         }
@@ -1708,21 +1731,19 @@ private:
     }
 
     Expression TextureGather(Operation operation) {
-        const auto meta = std::get_if<MetaTexture>(&operation.GetMeta());
-        ASSERT(meta);
+        const auto& meta = std::get<MetaTexture>(operation.GetMeta());
 
-        const auto type = meta->sampler.IsShadow() ? Type::Float : Type::Int;
-        if (meta->sampler.IsShadow()) {
-            return {GenerateTexture(operation, "Gather", {TextureAoffi{}}, true) +
-                        GetSwizzle(meta->element),
-                    Type::Float};
+        const auto type = meta.sampler.IsShadow() ? Type::Float : Type::Int;
+        const bool separate_dc = meta.sampler.IsShadow();
+
+        std::vector<TextureIR> ir;
+        if (meta.sampler.IsShadow()) {
+            ir = {TextureOffset{}};
         } else {
-            return {GenerateTexture(operation, "Gather",
-                                    {TextureAoffi{}, TextureArgument{type, meta->component}},
-                                    false) +
-                        GetSwizzle(meta->element),
-                    Type::Float};
+            ir = {TextureOffset{}, TextureArgument{type, meta.component}};
         }
+        return {GenerateTexture(operation, "Gather", ir, separate_dc) + GetSwizzle(meta.element),
+                Type::Float};
     }
 
     Expression TextureQueryDimensions(Operation operation) {
@@ -1793,7 +1814,8 @@ private:
         const auto meta = std::get_if<MetaTexture>(&operation.GetMeta());
         ASSERT(meta);
 
-        std::string expr = GenerateTexture(operation, "Grad", {TextureDerivates{}, TextureAoffi{}});
+        std::string expr =
+            GenerateTexture(operation, "Grad", {TextureDerivates{}, TextureOffset{}});
         return {std::move(expr) + GetSwizzle(meta->element), Type::Float};
     }
 
diff --git a/src/video_core/shader/decode/texture.cpp b/src/video_core/shader/decode/texture.cpp
index 6b6458993..dd8ff851e 100644
--- a/src/video_core/shader/decode/texture.cpp
+++ b/src/video_core/shader/decode/texture.cpp
@@ -91,18 +91,17 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
     case OpCode::Id::TLD4: {
         UNIMPLEMENTED_IF_MSG(instr.tld4.UsesMiscMode(TextureMiscMode::NDV),
                              "NDV is not implemented");
-        UNIMPLEMENTED_IF_MSG(instr.tld4.UsesMiscMode(TextureMiscMode::PTP),
-                             "PTP is not implemented");
-
         const auto texture_type = instr.tld4.texture_type.Value();
         const bool depth_compare = is_bindless ? instr.tld4_b.UsesMiscMode(TextureMiscMode::DC)
                                                : instr.tld4.UsesMiscMode(TextureMiscMode::DC);
         const bool is_array = instr.tld4.array != 0;
         const bool is_aoffi = is_bindless ? instr.tld4_b.UsesMiscMode(TextureMiscMode::AOFFI)
                                           : instr.tld4.UsesMiscMode(TextureMiscMode::AOFFI);
-        WriteTexInstructionFloat(
-            bb, instr,
-            GetTld4Code(instr, texture_type, depth_compare, is_array, is_aoffi, is_bindless));
+        const bool is_ptp = is_bindless ? instr.tld4_b.UsesMiscMode(TextureMiscMode::PTP)
+                                        : instr.tld4.UsesMiscMode(TextureMiscMode::PTP);
+        WriteTexInstructionFloat(bb, instr,
+                                 GetTld4Code(instr, texture_type, depth_compare, is_array, is_aoffi,
+                                             is_ptp, is_bindless));
         break;
     }
     case OpCode::Id::TLD4S: {
@@ -145,7 +144,7 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
         Node4 values;
         for (u32 element = 0; element < values.size(); ++element) {
             auto coords_copy = coords;
-            MetaTexture meta{sampler, {}, depth_compare, aoffi, {}, {}, {}, component, element};
+            MetaTexture meta{sampler, {}, depth_compare, aoffi, {}, {}, {}, {}, component, element};
             values[element] = Operation(OperationCode::TextureGather, meta, std::move(coords_copy));
         }
 
@@ -194,7 +193,7 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
         }
 
         for (u32 element = 0; element < values.size(); ++element) {
-            MetaTexture meta{*sampler, {}, {}, {}, derivates, {}, {}, {}, element};
+            MetaTexture meta{*sampler, {}, {}, {}, {}, derivates, {}, {}, {}, element};
             values[element] = Operation(OperationCode::TextureGradient, std::move(meta), coords);
         }
 
@@ -234,7 +233,7 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
                 if (!instr.txq.IsComponentEnabled(element)) {
                     continue;
                 }
-                MetaTexture meta{*sampler, {}, {}, {}, {}, {}, {}, {}, element};
+                MetaTexture meta{*sampler, {}, {}, {}, {}, {}, {}, {}, {}, element};
                 const Node value =
                     Operation(OperationCode::TextureQueryDimensions, meta,
                               GetRegister(instr.gpr8.Value() + (is_bindless ? 1 : 0)));
@@ -303,7 +302,7 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
                 continue;
             }
             auto params = coords;
-            MetaTexture meta{*sampler, {}, {}, {}, {}, {}, {}, {}, element};
+            MetaTexture meta{*sampler, {}, {}, {}, {}, {}, {}, {}, {}, element};
             const Node value = Operation(OperationCode::TextureQueryLod, meta, std::move(params));
             SetTemporary(bb, indexer++, value);
         }
@@ -542,7 +541,7 @@ Node4 ShaderIR::GetTextureCode(Instruction instr, TextureType texture_type,
 
     for (u32 element = 0; element < values.size(); ++element) {
         auto copy_coords = coords;
-        MetaTexture meta{*sampler, array, depth_compare, aoffi, {}, bias, lod, {}, element};
+        MetaTexture meta{*sampler, array, depth_compare, aoffi, {}, {}, bias, lod, {}, element};
         values[element] = Operation(read_method, meta, std::move(copy_coords));
     }
 
@@ -639,7 +638,9 @@ Node4 ShaderIR::GetTexsCode(Instruction instr, TextureType texture_type,
 }
 
 Node4 ShaderIR::GetTld4Code(Instruction instr, TextureType texture_type, bool depth_compare,
-                            bool is_array, bool is_aoffi, bool is_bindless) {
+                            bool is_array, bool is_aoffi, bool is_ptp, bool is_bindless) {
+    ASSERT_MSG(!(is_aoffi && is_ptp), "AOFFI and PTP can't be enabled at the same time");
+
     const std::size_t coord_count = GetCoordCount(texture_type);
 
     // If enabled arrays index is always stored in the gpr8 field
@@ -665,12 +666,15 @@ Node4 ShaderIR::GetTld4Code(Instruction instr, TextureType texture_type, bool de
         return values;
     }
 
-    std::vector<Node> aoffi;
+    std::vector<Node> aoffi, ptp;
     if (is_aoffi) {
         aoffi = GetAoffiCoordinates(GetRegister(parameter_register++), coord_count, true);
+    } else if (is_ptp) {
+        ptp = GetPtpCoordinates(
+            {GetRegister(parameter_register++), GetRegister(parameter_register++)});
     }
 
-    Node dc{};
+    Node dc;
     if (depth_compare) {
         dc = GetRegister(parameter_register++);
     }
@@ -680,8 +684,8 @@ Node4 ShaderIR::GetTld4Code(Instruction instr, TextureType texture_type, bool de
 
     for (u32 element = 0; element < values.size(); ++element) {
         auto coords_copy = coords;
-        MetaTexture meta{*sampler, GetRegister(array_register), dc, aoffi, {}, {}, {}, component,
-                         element};
+        MetaTexture meta{
+            *sampler, GetRegister(array_register), dc, aoffi, ptp, {}, {}, {}, component, element};
         values[element] = Operation(OperationCode::TextureGather, meta, std::move(coords_copy));
     }
 
@@ -714,7 +718,7 @@ Node4 ShaderIR::GetTldCode(Tegra::Shader::Instruction instr) {
     Node4 values;
     for (u32 element = 0; element < values.size(); ++element) {
         auto coords_copy = coords;
-        MetaTexture meta{sampler, array_register, {}, {}, {}, {}, lod, {}, element};
+        MetaTexture meta{sampler, array_register, {}, {}, {}, {}, {}, lod, {}, element};
         values[element] = Operation(OperationCode::TexelFetch, meta, std::move(coords_copy));
     }
 
@@ -759,7 +763,7 @@ Node4 ShaderIR::GetTldsCode(Instruction instr, TextureType texture_type, bool is
     Node4 values;
     for (u32 element = 0; element < values.size(); ++element) {
         auto coords_copy = coords;
-        MetaTexture meta{sampler, array, {}, {}, {}, {}, lod, {}, element};
+        MetaTexture meta{sampler, array, {}, {}, {}, {}, {}, lod, {}, element};
         values[element] = Operation(OperationCode::TexelFetch, meta, std::move(coords_copy));
     }
     return values;
@@ -824,4 +828,38 @@ std::vector<Node> ShaderIR::GetAoffiCoordinates(Node aoffi_reg, std::size_t coor
     return aoffi;
 }
 
+std::vector<Node> ShaderIR::GetPtpCoordinates(std::array<Node, 2> ptp_regs) {
+    static constexpr u32 num_entries = 8;
+
+    std::vector<Node> ptp;
+    ptp.reserve(num_entries);
+
+    const auto global_size = static_cast<s64>(global_code.size());
+    const std::optional low = TrackImmediate(ptp_regs[0], global_code, global_size);
+    const std::optional high = TrackImmediate(ptp_regs[1], global_code, global_size);
+    if (!low || !high) {
+        for (u32 entry = 0; entry < num_entries; ++entry) {
+            const u32 reg = entry / 4;
+            const u32 offset = entry % 4;
+            const Node value = BitfieldExtract(ptp_regs[reg], offset * 8, 6);
+            const Node condition =
+                Operation(OperationCode::LogicalIGreaterEqual, value, Immediate(32));
+            const Node negative = Operation(OperationCode::IAdd, value, Immediate(-64));
+            ptp.push_back(Operation(OperationCode::Select, condition, negative, value));
+        }
+        return ptp;
+    }
+
+    const u64 immediate = (static_cast<u64>(*high) << 32) | static_cast<u64>(*low);
+    for (u32 entry = 0; entry < num_entries; ++entry) {
+        s32 value = (immediate >> (entry * 8)) & 0b111111;
+        if (value >= 32) {
+            value -= 64;
+        }
+        ptp.push_back(Immediate(value));
+    }
+
+    return ptp;
+}
+
 } // namespace VideoCommon::Shader
diff --git a/src/video_core/shader/node.h b/src/video_core/shader/node.h
index abd40f582..4d2f4d6a8 100644
--- a/src/video_core/shader/node.h
+++ b/src/video_core/shader/node.h
@@ -374,6 +374,7 @@ struct MetaTexture {
     Node array;
     Node depth_compare;
     std::vector<Node> aoffi;
+    std::vector<Node> ptp;
     std::vector<Node> derivates;
     Node bias;
     Node lod;
diff --git a/src/video_core/shader/shader_ir.h b/src/video_core/shader/shader_ir.h
index 04ae5f822..baed06ccd 100644
--- a/src/video_core/shader/shader_ir.h
+++ b/src/video_core/shader/shader_ir.h
@@ -350,7 +350,8 @@ private:
                       bool is_array);
 
     Node4 GetTld4Code(Tegra::Shader::Instruction instr, Tegra::Shader::TextureType texture_type,
-                      bool depth_compare, bool is_array, bool is_aoffi, bool is_bindless);
+                      bool depth_compare, bool is_array, bool is_aoffi, bool is_ptp,
+                      bool is_bindless);
 
     Node4 GetTldCode(Tegra::Shader::Instruction instr);
 
@@ -363,6 +364,8 @@ private:
 
     std::vector<Node> GetAoffiCoordinates(Node aoffi_reg, std::size_t coord_count, bool is_tld4);
 
+    std::vector<Node> GetPtpCoordinates(std::array<Node, 2> ptp_regs);
+
     Node4 GetTextureCode(Tegra::Shader::Instruction instr, Tegra::Shader::TextureType texture_type,
                          Tegra::Shader::TextureProcessMode process_mode, std::vector<Node> coords,
                          Node array, Node depth_compare, u32 bias_offset, std::vector<Node> aoffi,