gl_shader_decompiler: Keep track of written images and mark them as modified

3 files changed, 54 insertions, 42 deletions

diff --git a/src/video_core/shader/decode/image.cpp b/src/video_core/shader/decode/image.cpp
index 77151a24b..008109a99 100644
--- a/src/video_core/shader/decode/image.cpp
+++ b/src/video_core/shader/decode/image.cpp
@@ -61,56 +61,54 @@ u32 ShaderIR::DecodeImage(NodeBlock& bb, u32 pc) {
         }
 
         const auto type{instr.sust.image_type};
-        const auto& image{instr.sust.is_immediate ? GetImage(instr.image, type)
-                                                  : GetBindlessImage(instr.gpr39, type)};
+        auto& image{instr.sust.is_immediate ? GetImage(instr.image, type)
+                                            : GetBindlessImage(instr.gpr39, type)};
+        image.MarkWrite();
+
         MetaImage meta{image, values};
         const Node store{Operation(OperationCode::ImageStore, meta, std::move(coords))};
         bb.push_back(store);
         break;
     }
     default:
-        UNIMPLEMENTED_MSG("Unhandled conversion instruction: {}", opcode->get().GetName());
+        UNIMPLEMENTED_MSG("Unhandled image instruction: {}", opcode->get().GetName());
     }
 
     return pc;
 }
 
-const Image& ShaderIR::GetImage(Tegra::Shader::Image image, Tegra::Shader::ImageType type) {
-    const auto offset{static_cast<std::size_t>(image.index.Value())};
+Image& ShaderIR::GetImage(Tegra::Shader::Image image, Tegra::Shader::ImageType type) {
+    const auto offset{static_cast<u64>(image.index.Value())};
 
     // If this image has already been used, return the existing mapping.
-    const auto itr{std::find_if(used_images.begin(), used_images.end(),
-                                [=](const Image& entry) { return entry.GetOffset() == offset; })};
-    if (itr != used_images.end()) {
-        ASSERT(itr->GetType() == type);
-        return *itr;
+    const auto it = used_images.find(offset);
+    if (it != used_images.end()) {
+        ASSERT(it->second.GetType() == type);
+        return it->second;
     }
 
     // Otherwise create a new mapping for this image.
     const std::size_t next_index{used_images.size()};
-    const Image entry{offset, next_index, type};
-    return *used_images.emplace(entry).first;
+    return used_images.emplace(offset, Image{offset, next_index, type}).first->second;
 }
 
-const Image& ShaderIR::GetBindlessImage(Tegra::Shader::Register reg,
-                                        Tegra::Shader::ImageType type) {
+Image& ShaderIR::GetBindlessImage(Tegra::Shader::Register reg, Tegra::Shader::ImageType type) {
     const Node image_register{GetRegister(reg)};
     const auto [base_image, cbuf_index, cbuf_offset]{
         TrackCbuf(image_register, global_code, static_cast<s64>(global_code.size()))};
     const auto cbuf_key{(static_cast<u64>(cbuf_index) << 32) | static_cast<u64>(cbuf_offset)};
 
     // If this image has already been used, return the existing mapping.
-    const auto itr{std::find_if(used_images.begin(), used_images.end(),
-                                [=](const Image& entry) { return entry.GetOffset() == cbuf_key; })};
-    if (itr != used_images.end()) {
-        ASSERT(itr->GetType() == type);
-        return *itr;
+    const auto it = used_images.find(cbuf_key);
+    if (it != used_images.end()) {
+        ASSERT(it->second.GetType() == type);
+        return it->second;
     }
 
     // Otherwise create a new mapping for this image.
     const std::size_t next_index{used_images.size()};
-    const Image entry{cbuf_index, cbuf_offset, next_index, type};
-    return *used_images.emplace(entry).first;
+    return used_images.emplace(cbuf_key, Image{cbuf_index, cbuf_offset, next_index, type})
+        .first->second;
 }
 
 } // namespace VideoCommon::Shader
diff --git a/src/video_core/shader/node.h b/src/video_core/shader/node.h
index 0397f4c6e..b29aedce8 100644
--- a/src/video_core/shader/node.h
+++ b/src/video_core/shader/node.h
@@ -273,50 +273,64 @@ private:
     bool is_bindless{}; ///< Whether this sampler belongs to a bindless texture or not.
 };
 
-class Image {
+class Image final {
 public:
-    explicit Image(std::size_t offset, std::size_t index, Tegra::Shader::ImageType type)
+    constexpr explicit Image(u64 offset, std::size_t index, Tegra::Shader::ImageType type)
         : offset{offset}, index{index}, type{type}, is_bindless{false} {}
 
-    explicit Image(u32 cbuf_index, u32 cbuf_offset, std::size_t index,
-                   Tegra::Shader::ImageType type)
+    constexpr explicit Image(u32 cbuf_index, u32 cbuf_offset, std::size_t index,
+                             Tegra::Shader::ImageType type)
         : offset{(static_cast<u64>(cbuf_index) << 32) | cbuf_offset}, index{index}, type{type},
           is_bindless{true} {}
 
-    explicit Image(std::size_t offset, std::size_t index, Tegra::Shader::ImageType type,
-                   bool is_bindless)
-        : offset{offset}, index{index}, type{type}, is_bindless{is_bindless} {}
+    constexpr explicit Image(std::size_t offset, std::size_t index, Tegra::Shader::ImageType type,
+                             bool is_bindless, bool is_written, bool is_read)
+        : offset{offset}, index{index}, type{type}, is_bindless{is_bindless},
+          is_written{is_written}, is_read{is_read} {}
 
-    std::size_t GetOffset() const {
+    void MarkRead() {
+        is_read = true;
+    }
+
+    void MarkWrite() {
+        is_written = true;
+    }
+
+    constexpr std::size_t GetOffset() const {
         return offset;
     }
 
-    std::size_t GetIndex() const {
+    constexpr std::size_t GetIndex() const {
         return index;
     }
 
-    Tegra::Shader::ImageType GetType() const {
+    constexpr Tegra::Shader::ImageType GetType() const {
         return type;
     }
 
-    bool IsBindless() const {
+    constexpr bool IsBindless() const {
         return is_bindless;
     }
 
-    std::pair<u32, u32> GetBindlessCBuf() const {
-        return {static_cast<u32>(offset >> 32), static_cast<u32>(offset)};
+    constexpr bool IsRead() const {
+        return is_read;
+    }
+
+    constexpr bool IsWritten() const {
+        return is_written;
     }
 
-    bool operator<(const Image& rhs) const {
-        return std::tie(offset, index, type, is_bindless) <
-               std::tie(rhs.offset, rhs.index, rhs.type, rhs.is_bindless);
+    constexpr std::pair<u32, u32> GetBindlessCBuf() const {
+        return {static_cast<u32>(offset >> 32), static_cast<u32>(offset)};
     }
 
 private:
-    std::size_t offset{};
+    u64 offset{};
     std::size_t index{};
     Tegra::Shader::ImageType type{};
     bool is_bindless{};
+    bool is_read{};
+    bool is_written{};
 };
 
 struct GlobalMemoryBase {
diff --git a/src/video_core/shader/shader_ir.h b/src/video_core/shader/shader_ir.h
index bcc9b79b6..0f891eace 100644
--- a/src/video_core/shader/shader_ir.h
+++ b/src/video_core/shader/shader_ir.h
@@ -95,7 +95,7 @@ public:
         return used_samplers;
     }
 
-    const std::set<Image>& GetImages() const {
+    const std::map<u64, Image>& GetImages() const {
         return used_images;
     }
 
@@ -272,10 +272,10 @@ private:
                                       bool is_shadow);
 
     /// Accesses an image.
-    const Image& GetImage(Tegra::Shader::Image image, Tegra::Shader::ImageType type);
+    Image& GetImage(Tegra::Shader::Image image, Tegra::Shader::ImageType type);
 
     /// Access a bindless image sampler.
-    const Image& GetBindlessImage(Tegra::Shader::Register reg, Tegra::Shader::ImageType type);
+    Image& GetBindlessImage(Tegra::Shader::Register reg, Tegra::Shader::ImageType type);
 
     /// Extracts a sequence of bits from a node
     Node BitfieldExtract(Node value, u32 offset, u32 bits);
@@ -356,7 +356,7 @@ private:
     std::set<Tegra::Shader::Attribute::Index> used_output_attributes;
     std::map<u32, ConstBuffer> used_cbufs;
     std::set<Sampler> used_samplers;
-    std::set<Image> used_images;
+    std::map<u64, Image> used_images;
     std::array<bool, Tegra::Engines::Maxwell3D::Regs::NumClipDistances> used_clip_distances{};
     std::map<GlobalMemoryBase, GlobalMemoryUsage> used_global_memory;
     bool uses_layer{};