From 06c4ce86458310870abec90ada68ac393256b9b6 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sat, 27 Apr 2019 02:07:18 -0300
Subject: shader: Decode SUST and implement backing image functionality

---
 src/video_core/shader/decode/image.cpp | 89 ++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 src/video_core/shader/decode/image.cpp

(limited to 'src/video_core/shader/decode')

diff --git a/src/video_core/shader/decode/image.cpp b/src/video_core/shader/decode/image.cpp
new file mode 100644
index 000000000..66fdf5714
--- /dev/null
+++ b/src/video_core/shader/decode/image.cpp
@@ -0,0 +1,89 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "video_core/engines/shader_bytecode.h"
+#include "video_core/shader/shader_ir.h"
+
+namespace VideoCommon::Shader {
+
+using Tegra::Shader::Instruction;
+using Tegra::Shader::OpCode;
+
+namespace {
+std::size_t GetImageTypeNumCoordinates(Tegra::Shader::ImageType image_type) {
+    switch (image_type) {
+    case Tegra::Shader::ImageType::Texture1D:
+    case Tegra::Shader::ImageType::TextureBuffer:
+        return 1;
+    case Tegra::Shader::ImageType::Texture1DArray:
+    case Tegra::Shader::ImageType::Texture2D:
+        return 2;
+    case Tegra::Shader::ImageType::Texture2DArray:
+    case Tegra::Shader::ImageType::Texture3D:
+        return 3;
+    }
+    UNREACHABLE();
+    return 1;
+}
+} // Anonymous namespace
+
+u32 ShaderIR::DecodeImage(NodeBlock& bb, u32 pc) {
+    const Instruction instr = {program_code[pc]};
+    const auto opcode = OpCode::Decode(instr);
+
+    switch (opcode->get().GetId()) {
+    case OpCode::Id::SUST: {
+        UNIMPLEMENTED_IF(instr.sust.mode != Tegra::Shader::SurfaceDataMode::P);
+        UNIMPLEMENTED_IF(instr.sust.image_type == Tegra::Shader::ImageType::TextureBuffer);
+        UNIMPLEMENTED_IF(instr.sust.out_of_bounds_store != Tegra::Shader::OutOfBoundsStore::Ignore);
+        UNIMPLEMENTED_IF(instr.sust.component_mask_selector != 0xf); // Ensure we have an RGBA store
+
+        std::vector<Node> values;
+        constexpr std::size_t hardcoded_size{4};
+        for (std::size_t i = 0; i < hardcoded_size; ++i) {
+            values.push_back(GetRegister(instr.gpr0.Value() + i));
+        }
+
+        std::vector<Node> coords;
+        const std::size_t num_coords{GetImageTypeNumCoordinates(instr.sust.image_type)};
+        for (std::size_t i = 0; i < num_coords; ++i) {
+            coords.push_back(GetRegister(instr.gpr8.Value() + i));
+        }
+
+        ASSERT(instr.sust.is_immediate);
+        const auto& image{GetImage(instr.image, instr.sust.image_type)};
+        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());
+    }
+
+    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())};
+
+    // 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;
+    }
+
+    // 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;
+}
+
+} // namespace VideoCommon::Shader
-- 
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