video_core: added support for indirect dispatches (gfx only)

src/video_core/amdgpu/liverpool.cpp

@@ -383,6 +383,22 @@ Liverpool::Task Liverpool::ProcessGraphics(std::span<const u32> dcb, std::span<c
                 }
                 break;
             }
+            case PM4ItOpcode::DispatchIndirect: {
+                const auto* dispatch_indirect =
+                    reinterpret_cast<const PM4CmdDispatchIndirect*>(header);
+                const auto offset = dispatch_indirect->data_offset;
+                const auto ib_address = mapped_queues[GfxQueueId].indirect_args_addr;
+                const auto size = sizeof(PM4CmdDispatchIndirect::GroupDimensions);
+                if (rasterizer && (regs.cs_program.dispatch_initiator & 1)) {
+                    const auto cmd_address = reinterpret_cast<const void*>(header);
+                    rasterizer->ScopeMarkerBegin(
+                        fmt::format("dcb:{}:DispatchIndirect", cmd_address));
+                    rasterizer->Breadcrumb(u64(cmd_address));
+                    rasterizer->DispatchIndirect(ib_address, offset, size);
+                    rasterizer->ScopeMarkerEnd();
+                }
+                break;
+            }
             case PM4ItOpcode::NumInstances: {
                 const auto* num_instances = reinterpret_cast<const PM4CmdDrawNumInstances*>(header);
                 regs.num_instances.num_instances = num_instances->num_instances;
@@ -399,6 +415,12 @@ Liverpool::Task Liverpool::ProcessGraphics(std::span<const u32> dcb, std::span<c
                 regs.num_indices = index_size->num_indices;
                 break;
             }
+            case PM4ItOpcode::SetBase: {
+                const auto* set_base = reinterpret_cast<const PM4CmdSetBase*>(header);
+                ASSERT(set_base->base_index == PM4CmdSetBase::BaseIndex::DrawIndexIndirPatchTable);
+                mapped_queues[GfxQueueId].indirect_args_addr = set_base->Address<u64>();
+                break;
+            }
             case PM4ItOpcode::EventWrite: {
                 // const auto* event = reinterpret_cast<const PM4CmdEventWrite*>(header);
                 break;

src/video_core/amdgpu/liverpool.h

@@ -1127,6 +1127,7 @@ struct Liverpool {
         std::vector<u32> ccb_buffer;
         std::queue<Task::Handle> submits{};
         ComputeProgram cs_state{};
+        VAddr indirect_args_addr{};
     };
     std::array<GpuQueue, NumTotalQueues> mapped_queues{};
 

src/video_core/amdgpu/pm4_cmds.h

@@ -704,4 +704,40 @@ struct PM4CmdReleaseMem {
     }
 };
 
+struct PM4CmdSetBase {
+    enum class BaseIndex : u32 {
+        DisplayListPatchTable = 0b0000,
+        DrawIndexIndirPatchTable = 0b0001,
+        GdsPartition = 0b0010,
+        CePartition = 0b0011,
+    };
+
+    PM4Type3Header header;
+    union {
+        BitField<0, 4, BaseIndex> base_index;
+        u32 dw1;
+    };
+    u32 address0;
+    u32 address1;
+
+    template <typename T>
+    T Address() const {
+        ASSERT(base_index == BaseIndex::DisplayListPatchTable ||
+               base_index == BaseIndex::DrawIndexIndirPatchTable);
+        return reinterpret_cast<T>(address0 | (u64(address1 & 0xffff) << 32u));
+    }
+};
+
+struct PM4CmdDispatchIndirect {
+    struct GroupDimensions {
+        u32 dim_x;
+        u32 dim_y;
+        u32 dim_z;
+    };
+
+    PM4Type3Header header;
+    u32 data_offset;        ///< Byte aligned offset where the required data structure starts
+    u32 dispatch_initiator; ///< Dispatch Initiator Register
+};
+
 } // namespace AmdGpu

src/video_core/buffer_cache/buffer.cpp

@@ -17,7 +17,8 @@ constexpr vk::BufferUsageFlags AllFlags =
     vk::BufferUsageFlagBits::eTransferSrc | vk::BufferUsageFlagBits::eTransferDst |
     vk::BufferUsageFlagBits::eUniformTexelBuffer | vk::BufferUsageFlagBits::eStorageTexelBuffer |
     vk::BufferUsageFlagBits::eUniformBuffer | vk::BufferUsageFlagBits::eStorageBuffer |
-    vk::BufferUsageFlagBits::eIndexBuffer | vk::BufferUsageFlagBits::eVertexBuffer;
+    vk::BufferUsageFlagBits::eIndexBuffer | vk::BufferUsageFlagBits::eVertexBuffer |
+    vk::BufferUsageFlagBits::eIndirectBuffer;
 
 std::string_view BufferTypeName(MemoryUsage type) {
     switch (type) {

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -90,6 +90,45 @@ void Rasterizer::DispatchDirect() {
     cmdbuf.dispatch(cs_program.dim_x, cs_program.dim_y, cs_program.dim_z);
 }
 
+void Rasterizer::DispatchIndirect(VAddr address, u32 offset, u32 size) {
+    RENDERER_TRACE;
+
+    const auto cmdbuf = scheduler.CommandBuffer();
+    const auto& cs_program = liverpool->regs.cs_program;
+    const ComputePipeline* pipeline = pipeline_cache.GetComputePipeline();
+    if (!pipeline) {
+        return;
+    }
+
+    try {
+        const auto has_resources = pipeline->BindResources(buffer_cache, texture_cache);
+        if (!has_resources) {
+            return;
+        }
+    } catch (...) {
+        UNREACHABLE();
+    }
+
+    scheduler.EndRendering();
+    cmdbuf.bindPipeline(vk::PipelineBindPoint::eCompute, pipeline->Handle());
+    const auto [buffer, base] = buffer_cache.ObtainBuffer(address, size, true);
+    const auto total_offset = base + offset;
+
+    // Emulate PFP-to-ME sync packet
+    const vk::BufferMemoryBarrier ib_barrier{
+        .srcAccessMask = vk::AccessFlagBits::eShaderWrite,
+        .dstAccessMask = vk::AccessFlagBits::eIndirectCommandRead,
+        .buffer = buffer->Handle(),
+        .offset = total_offset,
+        .size = size,
+    };
+    cmdbuf.pipelineBarrier(vk::PipelineStageFlagBits::eComputeShader,
+                           vk::PipelineStageFlagBits::eDrawIndirect,
+                           vk::DependencyFlagBits::eByRegion, {}, ib_barrier, {});
+
+    cmdbuf.dispatchIndirect(buffer->Handle(), total_offset);
+}
+
 u64 Rasterizer::Flush() {
     const u64 current_tick = scheduler.CurrentTick();
     SubmitInfo info{};

src/video_core/renderer_vulkan/vk_rasterizer.h

@@ -34,6 +34,7 @@ class Rasterizer {
     void Draw(bool is_indexed, u32 index_offset = 0);
 
     void DispatchDirect();
+    void DispatchIndirect(VAddr address, u32 offset, u32 size);
 
     void ScopeMarkerBegin(const std::string_view& str);
     void ScopeMarkerEnd();