glasm: Implement ImageFetch

src/shader_recompiler/backend/glasm/emit_context.cpp

@@ -80,11 +80,14 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings) : info{progra
             Add("OUTPUT out_attr{}[]={{result.attrib[{}..{}]}};", index, index, index);
         }
     }
-    const size_t num_textures{program.info.texture_descriptors.size()};
-    texture_bindings.resize(num_textures);
-    for (size_t index = 0; index < num_textures; ++index) {
-        const auto& desc{program.info.texture_descriptors[index]};
-        texture_bindings[index] = bindings.texture;
+    texture_buffer_bindings.reserve(program.info.texture_buffer_descriptors.size());
+    for (const auto& desc : program.info.texture_buffer_descriptors) {
+        texture_buffer_bindings.push_back(bindings.texture);
+        bindings.texture += desc.count;
+    }
+    texture_bindings.reserve(program.info.texture_descriptors.size());
+    for (const auto& desc : program.info.texture_descriptors) {
+        texture_bindings.push_back(bindings.texture);
         bindings.texture += desc.count;
     }
 }

src/shader_recompiler/backend/glasm/emit_context.h

@@ -56,6 +56,7 @@ public:
     RegAlloc reg_alloc{*this};
     const Info& info;
 
+    std::vector<u32> texture_buffer_bindings;
     std::vector<u32> texture_bindings;
 
     std::string_view stage_name = "invalid";

src/shader_recompiler/backend/glasm/emit_glasm_image.cpp

@@ -43,7 +43,11 @@ struct ScopedRegister {
 std::string Texture(EmitContext& ctx, IR::TextureInstInfo info,
                     [[maybe_unused]] const IR::Value& index) {
     // FIXME: indexed reads
-    return fmt::format("texture[{}]", ctx.texture_bindings.at(info.descriptor_index));
+    if (info.type == TextureType::Buffer) {
+        return fmt::format("texture[{}]", ctx.texture_buffer_bindings.at(info.descriptor_index));
+    } else {
+        return fmt::format("texture[{}]", ctx.texture_bindings.at(info.descriptor_index));
+    }
 }
 
 std::string_view TextureType(IR::TextureInstInfo info) {
@@ -421,11 +425,28 @@ void EmitImageGatherDref(EmitContext& ctx, IR::Inst& inst, const IR::Value& inde
     StoreSparse(ctx, sparse_inst);
 }
 
-void EmitImageFetch([[maybe_unused]] EmitContext& ctx, [[maybe_unused]] IR::Inst& inst,
-                    [[maybe_unused]] const IR::Value& index, [[maybe_unused]] Register coord,
-                    [[maybe_unused]] Register offset, [[maybe_unused]] Register lod,
-                    [[maybe_unused]] Register ms) {
-    throw NotImplementedException("GLASM instruction");
+void EmitImageFetch(EmitContext& ctx, IR::Inst& inst, const IR::Value& index,
+                    const IR::Value& coord, const IR::Value& offset, ScalarS32 lod, ScalarS32 ms) {
+    const auto info{inst.Flags<IR::TextureInstInfo>()};
+    const auto sparse_inst{inst.GetAssociatedPseudoOperation(IR::Opcode::GetSparseFromOp)};
+    const std::string_view sparse_mod{sparse_inst ? ".SPARSE" : ""};
+    const std::string_view type{TextureType(info)};
+    const std::string texture{Texture(ctx, info, index)};
+    const std::string offset_vec{Offset(ctx, offset)};
+    const auto [coord_vec, coord_alloc]{Coord(ctx, coord)};
+    const Register ret{ctx.reg_alloc.Define(inst)};
+    if (info.type == TextureType::Buffer) {
+        ctx.Add("TXF.F{} {},{},{},{}{};", sparse_mod, ret, coord_vec, texture, type, offset_vec);
+    } else if (ms.type != Type::Void) {
+        ctx.Add("MOV.S {}.w,{};"
+                "TXFMS.F{} {},{},{},{}{};",
+                coord_vec, ms, sparse_mod, ret, coord_vec, texture, type, offset_vec);
+    } else {
+        ctx.Add("MOV.S {}.w,{};"
+                "TXF.F{} {},{},{},{}{};",
+                coord_vec, lod, sparse_mod, ret, coord_vec, texture, type, offset_vec);
+    }
+    StoreSparse(ctx, sparse_inst);
 }
 
 void EmitImageQueryDimensions(EmitContext& ctx, IR::Inst& inst, const IR::Value& index,

src/shader_recompiler/backend/glasm/emit_glasm_instructions.h

@@ -541,8 +541,8 @@ void EmitImageGather(EmitContext& ctx, IR::Inst& inst, const IR::Value& index,
 void EmitImageGatherDref(EmitContext& ctx, IR::Inst& inst, const IR::Value& index,
                          const IR::Value& coord, const IR::Value& offset, const IR::Value& offset2,
                          const IR::Value& dref);
-void EmitImageFetch(EmitContext& ctx, IR::Inst& inst, const IR::Value& index, Register coord,
-                    Register offset, Register lod, Register ms);
+void EmitImageFetch(EmitContext& ctx, IR::Inst& inst, const IR::Value& index,
+                    const IR::Value& coord, const IR::Value& offset, ScalarS32 lod, ScalarS32 ms);
 void EmitImageQueryDimensions(EmitContext& ctx, IR::Inst& inst, const IR::Value& index,
                               ScalarF32 lod);
 void EmitImageQueryLod(EmitContext& ctx, IR::Inst& inst, const IR::Value& index, Register coord);