2 files changed, 77 insertions, 24 deletions

diff --git a/src/video_core/shader/decode/texture.cpp b/src/video_core/shader/decode/texture.cpp
index da8e886df..67926afcb 100644
--- a/src/video_core/shader/decode/texture.cpp
+++ b/src/video_core/shader/decode/texture.cpp
@@ -129,7 +129,7 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
         const Node component = Immediate(static_cast<u32>(instr.tld4s.component));
 
         const SamplerInfo info{TextureType::Texture2D, false, depth_compare};
-        const auto& sampler = GetSampler(instr.sampler, info);
+        const Sampler& sampler = *GetSampler(instr.sampler, info);
 
         Node4 values;
         for (u32 element = 0; element < values.size(); ++element) {
@@ -154,9 +154,17 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
         const auto texture_type = instr.txd.texture_type.Value();
         const auto coord_count = GetCoordCount(texture_type);
 
-        const auto& sampler = is_bindless
+        const Sampler* sampler = is_bindless
                                   ? GetBindlessSampler(base_reg, {{texture_type, false, false}})
                                   : GetSampler(instr.sampler, {{texture_type, false, false}});
+        Node4 values;
+        if (sampler == nullptr) {
+            for (u32 element = 0; element < values.size(); ++element) {
+                values[element] = Immediate(0);
+            }
+            WriteTexInstructionFloat(bb, instr, values);
+            break;
+        }
         if (is_bindless) {
             base_reg++;
         }
@@ -170,9 +178,8 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
             derivates.push_back(GetRegister(derivate_reg + derivate + 1));
         }
 
-        Node4 values;
         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);
         }
 
@@ -187,9 +194,24 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
         // TODO: The new commits on the texture refactor, change the way samplers work.
         // Sadly, not all texture instructions specify the type of texture their sampler
         // uses. This must be fixed at a later instance.
-        const auto& sampler =
+        const Sampler* sampler =
             is_bindless ? GetBindlessSampler(instr.gpr8) : GetSampler(instr.sampler);
 
+        if (sampler == nullptr) {
+            u32 indexer = 0;
+            for (u32 element = 0; element < 4; ++element) {
+                if (!instr.txq.IsComponentEnabled(element)) {
+                    continue;
+                }
+                const Node value = Immediate(0);
+                SetTemporary(bb, indexer++, value);
+            }
+            for (u32 i = 0; i < indexer; ++i) {
+                SetRegister(bb, instr.gpr0.Value() + i, GetTemporary(i));
+            }
+            break;
+        }
+
         u32 indexer = 0;
         switch (instr.txq.query_type) {
         case Tegra::Shader::TextureQueryType::Dimension: {
@@ -197,7 +219,7 @@ 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)));
@@ -223,9 +245,24 @@ u32 ShaderIR::DecodeTexture(NodeBlock& bb, u32 pc) {
 
         auto texture_type = instr.tmml.texture_type.Value();
         const bool is_array = instr.tmml.array != 0;
-        const auto& sampler =
+        const Sampler* sampler =
             is_bindless ? GetBindlessSampler(instr.gpr20) : GetSampler(instr.sampler);
 
+        if (sampler == nullptr) {
+            u32 indexer = 0;
+            for (u32 element = 0; element < 2; ++element) {
+                if (!instr.tmml.IsComponentEnabled(element)) {
+                    continue;
+                }
+                const Node value = Immediate(0);
+                SetTemporary(bb, indexer++, value);
+            }
+            for (u32 i = 0; i < indexer; ++i) {
+                SetRegister(bb, instr.gpr0.Value() + i, GetTemporary(i));
+            }
+            break;
+        }
+
         std::vector<Node> coords;
 
         // TODO: Add coordinates for different samplers once other texture types are implemented.
@@ -251,7 +288,7 @@ 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);
         }
@@ -307,7 +344,7 @@ ShaderIR::SamplerInfo ShaderIR::GetSamplerInfo(std::optional<SamplerInfo> sample
                        sampler->is_buffer != 0};
 }
 
-const Sampler& ShaderIR::GetSampler(const Tegra::Shader::Sampler& sampler,
+const Sampler* ShaderIR::GetSampler(const Tegra::Shader::Sampler& sampler,
                                     std::optional<SamplerInfo> sampler_info) {
     const auto offset = static_cast<u32>(sampler.index.Value());
     const auto info = GetSamplerInfo(sampler_info, offset);
@@ -319,21 +356,24 @@ const Sampler& ShaderIR::GetSampler(const Tegra::Shader::Sampler& sampler,
     if (it != used_samplers.end()) {
         ASSERT(!it->IsBindless() && it->GetType() == info.type && it->IsArray() == info.is_array &&
                it->IsShadow() == info.is_shadow && it->IsBuffer() == info.is_buffer);
-        return *it;
+        return &(*it);
     }
 
     // Otherwise create a new mapping for this sampler
     const auto next_index = static_cast<u32>(used_samplers.size());
-    return used_samplers.emplace_back(next_index, offset, info.type, info.is_array, info.is_shadow,
+    return &used_samplers.emplace_back(next_index, offset, info.type, info.is_array, info.is_shadow,
                                       info.is_buffer);
 }
 
-const Sampler& ShaderIR::GetBindlessSampler(Tegra::Shader::Register reg,
+const Sampler* ShaderIR::GetBindlessSampler(Tegra::Shader::Register reg,
                                             std::optional<SamplerInfo> sampler_info) {
     const Node sampler_register = GetRegister(reg);
     const auto [base_sampler, buffer, offset] =
         TrackCbuf(sampler_register, global_code, static_cast<s64>(global_code.size()));
     ASSERT(base_sampler != nullptr);
+    if (base_sampler == nullptr) {
+        return nullptr;
+    }
 
     const auto info = GetSamplerInfo(sampler_info, offset, buffer);
 
@@ -346,12 +386,12 @@ const Sampler& ShaderIR::GetBindlessSampler(Tegra::Shader::Register reg,
     if (it != used_samplers.end()) {
         ASSERT(it->IsBindless() && it->GetType() == info.type && it->IsArray() == info.is_array &&
                it->IsShadow() == info.is_shadow);
-        return *it;
+        return &(*it);
     }
 
     // Otherwise create a new mapping for this sampler
     const auto next_index = static_cast<u32>(used_samplers.size());
-    return used_samplers.emplace_back(next_index, offset, buffer, info.type, info.is_array,
+    return &used_samplers.emplace_back(next_index, offset, buffer, info.type, info.is_array,
                                       info.is_shadow, info.is_buffer);
 }
 
@@ -438,8 +478,15 @@ Node4 ShaderIR::GetTextureCode(Instruction instr, TextureType texture_type,
                          "This method is not supported.");
 
     const SamplerInfo info{texture_type, is_array, is_shadow, false};
-    const auto& sampler =
+    const Sampler* sampler =
         is_bindless ? GetBindlessSampler(*bindless_reg, info) : GetSampler(instr.sampler, info);
+    Node4 values;
+    if (sampler == nullptr) {
+        for (u32 element = 0; element < values.size(); ++element) {
+            values[element] = Immediate(0);
+        }
+        return values;
+    }
 
     const bool lod_needed = process_mode == TextureProcessMode::LZ ||
                             process_mode == TextureProcessMode::LL ||
@@ -478,10 +525,10 @@ Node4 ShaderIR::GetTextureCode(Instruction instr, TextureType texture_type,
         }
     }
 
-    Node4 values;
+
     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));
     }
 
@@ -594,8 +641,15 @@ Node4 ShaderIR::GetTld4Code(Instruction instr, TextureType texture_type, bool de
     u64 parameter_register = instr.gpr20.Value();
 
     const SamplerInfo info{texture_type, is_array, depth_compare, false};
-    const auto& sampler = is_bindless ? GetBindlessSampler(parameter_register++, info)
+    const Sampler* sampler = is_bindless ? GetBindlessSampler(parameter_register++, info)
                                       : GetSampler(instr.sampler, info);
+    Node4 values;
+    if (sampler == nullptr) {
+        for (u32 element = 0; element < values.size(); ++element) {
+            values[element] = Immediate(0);
+        }
+        return values;
+    }
 
     std::vector<Node> aoffi;
     if (is_aoffi) {
@@ -610,10 +664,9 @@ Node4 ShaderIR::GetTld4Code(Instruction instr, TextureType texture_type, bool de
     const Node component = is_bindless ? Immediate(static_cast<u32>(instr.tld4_b.component))
                                        : Immediate(static_cast<u32>(instr.tld4.component));
 
-    Node4 values;
     for (u32 element = 0; element < values.size(); ++element) {
         auto coords_copy = coords;
-        MetaTexture meta{sampler, GetRegister(array_register), dc, aoffi, {}, {}, {}, component,
+        MetaTexture meta{*sampler, GetRegister(array_register), dc, aoffi, {}, {}, {}, component,
                          element};
         values[element] = Operation(OperationCode::TextureGather, meta, std::move(coords_copy));
     }
@@ -642,7 +695,7 @@ Node4 ShaderIR::GetTldCode(Tegra::Shader::Instruction instr) {
     // const Node aoffi_register{is_aoffi ? GetRegister(gpr20_cursor++) : nullptr};
     // const Node multisample{is_multisample ? GetRegister(gpr20_cursor++) : nullptr};
 
-    const auto& sampler = GetSampler(instr.sampler);
+    const auto& sampler = *GetSampler(instr.sampler);
 
     Node4 values;
     for (u32 element = 0; element < values.size(); ++element) {
@@ -655,7 +708,7 @@ Node4 ShaderIR::GetTldCode(Tegra::Shader::Instruction instr) {
 }
 
 Node4 ShaderIR::GetTldsCode(Instruction instr, TextureType texture_type, bool is_array) {
-    const auto& sampler = GetSampler(instr.sampler);
+    const Sampler& sampler = *GetSampler(instr.sampler);
 
     const std::size_t type_coord_count = GetCoordCount(texture_type);
     const bool lod_enabled = instr.tlds.GetTextureProcessMode() == TextureProcessMode::LL;
diff --git a/src/video_core/shader/shader_ir.h b/src/video_core/shader/shader_ir.h
index 580f84fcb..8324432ae 100644
--- a/src/video_core/shader/shader_ir.h
+++ b/src/video_core/shader/shader_ir.h
@@ -313,11 +313,11 @@ private:
                                std::optional<u32> buffer = std::nullopt);
 
     /// Accesses a texture sampler
-    const Sampler& GetSampler(const Tegra::Shader::Sampler& sampler,
+    const Sampler* GetSampler(const Tegra::Shader::Sampler& sampler,
                               std::optional<SamplerInfo> sampler_info = std::nullopt);
 
     /// Accesses a texture sampler for a bindless texture.
-    const Sampler& GetBindlessSampler(Tegra::Shader::Register reg,
+    const Sampler* GetBindlessSampler(Tegra::Shader::Register reg,
                                       std::optional<SamplerInfo> sampler_info = std::nullopt);
 
     /// Accesses an image.