From e01a8f218707b6f3ed0f111c432440b07ea5b6ff Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Sun, 11 Feb 2018 21:34:20 -0500
Subject: GPU: Added a command processor to decode the GPU pushbuffers and
 forward the commands to their respective engines.

---
 src/video_core/command_processor.cpp | 130 +++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 src/video_core/command_processor.cpp

(limited to 'src/video_core/command_processor.cpp')

diff --git a/src/video_core/command_processor.cpp b/src/video_core/command_processor.cpp
new file mode 100644
index 000000000..e1df875e7
--- /dev/null
+++ b/src/video_core/command_processor.cpp
@@ -0,0 +1,130 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <array>
+#include <cstddef>
+#include <memory>
+#include <utility>
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "common/microprofile.h"
+#include "common/vector_math.h"
+#include "core/memory.h"
+#include "core/tracer/recorder.h"
+#include "video_core/command_processor.h"
+#include "video_core/engines/fermi_2d.h"
+#include "video_core/engines/maxwell_3d.h"
+#include "video_core/engines/maxwell_compute.h"
+#include "video_core/renderer_base.h"
+#include "video_core/video_core.h"
+
+namespace Tegra {
+
+namespace CommandProcessor {
+
+enum class BufferMethods {
+    BindObject = 0,
+    CountBufferMethods = 0x100,
+};
+
+enum class EngineID {
+    FERMI_TWOD_A = 0x902D, // 2D Engine
+    MAXWELL_B = 0xB197,    // 3D Engine
+    MAXWELL_COMPUTE_B = 0xB1C0,
+    KEPLER_INLINE_TO_MEMORY_B = 0xA140,
+    MAXWELL_DMA_COPY_A = 0xB0B5,
+};
+
+// Mapping of subchannels to their bound engine ids.
+static std::unordered_map<u32, EngineID> bound_engines;
+
+static void WriteReg(u32 method, u32 subchannel, u32 value) {
+    LOG_WARNING(HW_GPU, "Processing method %08X on subchannel %u value %08X", method, subchannel,
+                value);
+
+    if (method == static_cast<u32>(BufferMethods::BindObject)) {
+        // Bind the current subchannel to the desired engine id.
+        LOG_DEBUG(HW_GPU, "Binding subchannel %u to engine %u", subchannel, value);
+        ASSERT(bound_engines.find(subchannel) == bound_engines.end());
+        bound_engines[subchannel] = static_cast<EngineID>(value);
+        return;
+    }
+
+    if (method < static_cast<u32>(BufferMethods::CountBufferMethods)) {
+        // TODO(Subv): Research and implement these methods.
+        LOG_ERROR(HW_GPU, "Special buffer methods other than Bind are not implemented");
+        return;
+    }
+
+    ASSERT(bound_engines.find(subchannel) != bound_engines.end());
+
+    const EngineID engine = bound_engines[subchannel];
+
+    switch (engine) {
+    case EngineID::FERMI_TWOD_A:
+        Engines::Fermi2D::WriteReg(method, value);
+        break;
+    case EngineID::MAXWELL_B:
+        Engines::Maxwell3D::WriteReg(method, value);
+        break;
+    case EngineID::MAXWELL_COMPUTE_B:
+        Engines::MaxwellCompute::WriteReg(method, value);
+        break;
+    default:
+        UNIMPLEMENTED();
+    }
+}
+
+void ProcessCommandList(VAddr address, u32 size) {
+    VAddr current_addr = address;
+    while (current_addr < address + size * sizeof(CommandHeader)) {
+        const CommandHeader header = {Memory::Read32(current_addr)};
+        current_addr += sizeof(u32);
+
+        switch (header.mode.Value()) {
+        case SubmissionMode::IncreasingOld:
+        case SubmissionMode::Increasing: {
+            // Increase the method value with each argument.
+            for (unsigned i = 0; i < header.arg_count; ++i) {
+                WriteReg(header.method + i, header.subchannel, Memory::Read32(current_addr));
+                current_addr += sizeof(u32);
+            }
+            break;
+        }
+        case SubmissionMode::NonIncreasingOld:
+        case SubmissionMode::NonIncreasing: {
+            // Use the same method value for all arguments.
+            for (unsigned i = 0; i < header.arg_count; ++i) {
+                WriteReg(header.method, header.subchannel, Memory::Read32(current_addr));
+                current_addr += sizeof(u32);
+            }
+            break;
+        }
+        case SubmissionMode::IncreaseOnce: {
+            ASSERT(header.arg_count.Value() >= 1);
+            // Use the original method for the first argument and then the next method for all other
+            // arguments.
+            WriteReg(header.method, header.subchannel, Memory::Read32(current_addr));
+            current_addr += sizeof(u32);
+            // Use the same method value for all arguments.
+            for (unsigned i = 1; i < header.arg_count; ++i) {
+                WriteReg(header.method + 1, header.subchannel, Memory::Read32(current_addr));
+                current_addr += sizeof(u32);
+            }
+            break;
+        }
+        case SubmissionMode::Inline: {
+            // The register value is stored in the bits 16-28 as an immediate
+            WriteReg(header.method, header.subchannel, header.inline_data);
+            break;
+        }
+        default:
+            UNIMPLEMENTED();
+        }
+    }
+}
+
+} // namespace CommandProcessor
+
+} // namespace Tegra
-- 
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