video_core: Implement maxwell3d draw manager and split draw logic

src/video_core/engines/draw_manager.h

@@ -0,0 +1,69 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+#include "common/common_types.h"
+#include "video_core/engines/maxwell_3d.h"
+
+namespace VideoCore {
+class RasterizerInterface;
+}
+
+namespace Tegra::Engines {
+using PrimitiveTopology = Maxwell3D::Regs::PrimitiveTopology;
+using PrimitiveTopologyOverride = Maxwell3D::Regs::PrimitiveTopologyOverride;
+using IndexBuffer = Maxwell3D::Regs::IndexBuffer;
+using VertexBuffer = Maxwell3D::Regs::VertexBuffer;
+using IndexBufferSmall = Maxwell3D::Regs::IndexBufferSmall;
+
+class DrawManager {
+public:
+    enum class DrawMode : u32 { General = 0, Instance, InlineIndex };
+    struct State {
+        PrimitiveTopology topology{};
+        DrawMode draw_mode{};
+        bool draw_indexed{};
+        u32 base_index{};
+        VertexBuffer vertex_buffer;
+        IndexBuffer index_buffer;
+        u32 base_instance{};
+        u32 instance_count{};
+        std::vector<u8> inline_index_draw_indexes;
+    };
+
+    explicit DrawManager(Maxwell3D* maxwell_3d);
+
+    void ProcessMethodCall(u32 method, u32 argument);
+
+    void Clear(u32 layer_count);
+
+    void DrawDeferred();
+
+    void DrawArray(PrimitiveTopology topology, u32 vertex_first, u32 vertex_count,
+                   u32 base_instance, u32 num_instances);
+
+    void DrawIndex(PrimitiveTopology topology, u32 index_first, u32 index_count, u32 base_index,
+                   u32 base_instance, u32 num_instances);
+
+    const State& GetDrawState() const {
+        return draw_state;
+    }
+
+private:
+    void SetInlineIndexBuffer(u32 index);
+
+    void DrawBegin();
+
+    void DrawEnd(u32 instance_count = 1, bool force_draw = false);
+
+    void DrawIndexSmall(u32 argument);
+
+    void ProcessTopologyOverride();
+
+    void ProcessDraw(bool draw_indexed, u32 instance_count);
+
+    Maxwell3D* maxwell3d{};
+    State draw_state{};
+    bool use_topology_override{};
+};
+} // namespace Tegra::Engines