4 files changed, 63 insertions, 3 deletions

diff --git a/src/video_core/engines/draw_manager.cpp b/src/video_core/engines/draw_manager.cpp
index c60f32aad..183d5403c 100644
--- a/src/video_core/engines/draw_manager.cpp
+++ b/src/video_core/engines/draw_manager.cpp
@@ -91,6 +91,12 @@ void DrawManager::DrawIndex(PrimitiveTopology topology, u32 index_first, u32 ind
     ProcessDraw(true, num_instances);
 }
 
+void DrawManager::DrawArrayIndirect(PrimitiveTopology topology) {
+    draw_state.topology = topology;
+
+    ProcessDrawIndirect(true);
+}
+
 void DrawManager::DrawIndexedIndirect(PrimitiveTopology topology, u32 index_first, u32 index_count) {
     const auto& regs{maxwell3d->regs};
     draw_state.topology = topology;
diff --git a/src/video_core/engines/draw_manager.h b/src/video_core/engines/draw_manager.h
index 437990162..49a4fca48 100644
--- a/src/video_core/engines/draw_manager.h
+++ b/src/video_core/engines/draw_manager.h
@@ -56,6 +56,8 @@ public:
     void DrawIndex(PrimitiveTopology topology, u32 index_first, u32 index_count, u32 base_index,
                    u32 base_instance, u32 num_instances);
 
+    void DrawArrayIndirect(PrimitiveTopology topology);
+
     void DrawIndexedIndirect(PrimitiveTopology topology, u32 index_first, u32 index_count);
 
     const State& GetDrawState() const {
diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index cd6274a9b..b998a8e69 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -133,15 +133,52 @@ void Maxwell3D::ProcessMacro(u32 method, const u32* base_start, u32 amount, bool
     for (size_t i = 0; i < amount; i++) {
         macro_addresses.push_back(current_dma_segment + i * sizeof(u32));
     }
+    macro_segments.emplace_back(current_dma_segment, amount);
 
     // Call the macro when there are no more parameters in the command buffer
     if (is_last_call) {
         CallMacroMethod(executing_macro, macro_params);
         macro_params.clear();
         macro_addresses.clear();
+        macro_segments.clear();
     }
 }
 
+void Maxwell3D::RefreshParameters() {
+    size_t current_index = 0;
+    for (auto& segment : macro_segments) {
+        if (segment.first == 0) {
+            current_index += segment.second;
+            continue;
+        }
+        memory_manager.ReadBlock(segment.first, &macro_params[current_index],
+                                 sizeof(u32) * segment.second);
+        current_index += segment.second;
+    }
+}
+
+u32 Maxwell3D::GetMaxCurrentVertices() {
+    u32 num_vertices = 0;
+    for (size_t index = 0; index < Regs::NumVertexArrays; ++index) {
+        const auto& array = regs.vertex_streams[index];
+        if (array.enable == 0) {
+            continue;
+        }
+        const auto& attribute = regs.vertex_attrib_format[index];
+        if (attribute.constant) {
+            num_vertices = std::max(num_vertices, 1U);
+            continue;
+        }
+        const auto& limit = regs.vertex_stream_limits[index];
+        const GPUVAddr gpu_addr_begin = array.Address();
+        const GPUVAddr gpu_addr_end = limit.Address() + 1;
+        const u32 address_size = static_cast<u32>(gpu_addr_end - gpu_addr_begin);
+        num_vertices = std::max(
+            num_vertices, address_size / std::max(attribute.SizeInBytes(), array.stride.Value()));
+    }
+    return num_vertices;
+}
+
 u32 Maxwell3D::ProcessShadowRam(u32 method, u32 argument) {
     // Keep track of the register value in shadow_state when requested.
     const auto control = shadow_state.shadow_ram_control;
diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index ac5e87563..e2256594d 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -3068,10 +3068,14 @@ public:
     friend class DrawManager;
     
     std::vector<u8> inline_index_draw_indexes;
-    std::vector<GPUVAddr> macro_addresses;
 
-    Core::System& system;
-    MemoryManager& memory_manager;
+    GPUVAddr getMacroAddress(size_t index) const {
+        return macro_addresses[index];
+    }
+
+    void RefreshParameters();
+
+    u32 GetMaxCurrentVertices();
 
     /// Handles a write to the CLEAR_BUFFERS register.
     void ProcessClearBuffers(u32 layer_count);
@@ -3135,6 +3139,9 @@ private:
     /// Returns a query's value or an empty object if the value will be deferred through a cache.
     std::optional<u64> GetQueryResult();
 
+    Core::System& system;
+    MemoryManager& memory_manager;
+
     VideoCore::RasterizerInterface* rasterizer = nullptr;
 
     /// Start offsets of each macro in macro_memory
@@ -3151,6 +3158,14 @@ private:
     Upload::State upload_state;
 
     bool execute_on{true};
+
+    std::array<bool, Regs::NUM_REGS> draw_command{};
+    std::vector<u32> deferred_draw_method;
+    enum class DrawMode : u32 { General = 0, Instance, InlineIndex };
+    DrawMode draw_mode{DrawMode::General};
+    bool draw_indexed{};
+    std::vector<std::pair<GPUVAddr, size_t>> macro_segments;
+    std::vector<GPUVAddr> macro_addresses;
 };
 
 #define ASSERT_REG_POSITION(field_name, position)                                                  \