From 57401589c2e94d49b03fd68ae0ad5b2e36aac795 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Fri, 4 Aug 2023 03:33:04 +0200
Subject: Macro HLE: Add DrawIndirectByteCount

---
 src/video_core/macro/macro_hle.cpp | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

(limited to 'src/video_core/macro')

diff --git a/src/video_core/macro/macro_hle.cpp b/src/video_core/macro/macro_hle.cpp
index e980af171..046c8085e 100644
--- a/src/video_core/macro/macro_hle.cpp
+++ b/src/video_core/macro/macro_hle.cpp
@@ -67,6 +67,7 @@ public:
         }
 
         auto& params = maxwell3d.draw_manager->GetIndirectParams();
+        params.is_byte_count = false;
         params.is_indexed = false;
         params.include_count = false;
         params.count_start_address = 0;
@@ -161,6 +162,7 @@ public:
                 0, 0x644, Maxwell3D::HLEReplacementAttributeType::BaseInstance);
         }
         auto& params = maxwell3d.draw_manager->GetIndirectParams();
+        params.is_byte_count = false;
         params.is_indexed = true;
         params.include_count = false;
         params.count_start_address = 0;
@@ -256,6 +258,7 @@ public:
         const u32 estimate = static_cast<u32>(maxwell3d.EstimateIndexBufferSize());
         maxwell3d.dirty.flags[VideoCommon::Dirty::IndexBuffer] = true;
         auto& params = maxwell3d.draw_manager->GetIndirectParams();
+        params.is_byte_count = false;
         params.is_indexed = true;
         params.include_count = true;
         params.count_start_address = maxwell3d.GetMacroAddress(4);
@@ -324,17 +327,39 @@ public:
     explicit HLE_DrawIndirectByteCount(Maxwell3D& maxwell3d_) : HLEMacroImpl(maxwell3d_) {}
 
     void Execute(const std::vector<u32>& parameters, [[maybe_unused]] u32 method) override {
+        auto topology = static_cast<Maxwell3D::Regs::PrimitiveTopology>(parameters[0] & 0xFFFFU);
+        if (!maxwell3d.AnyParametersDirty() || !IsTopologySafe(topology)) {
+            Fallback(parameters);
+            return;
+        }
+
+        auto& params = maxwell3d.draw_manager->GetIndirectParams();
+        params.is_byte_count = true;
+        params.is_indexed = false;
+        params.include_count = false;
+        params.count_start_address = 0;
+        params.indirect_start_address = maxwell3d.GetMacroAddress(2);
+        params.buffer_size = 4;
+        params.max_draw_counts = 1;
+        params.stride = parameters[1];
+        maxwell3d.regs.draw.begin = parameters[0];
+        maxwell3d.regs.draw_auto_stride = parameters[1];
+        maxwell3d.regs.draw_auto_byte_count = parameters[2];
+
+        maxwell3d.draw_manager->DrawArrayIndirect(topology);
+    }
+
+private:
+    void Fallback(const std::vector<u32>& parameters) {
         maxwell3d.RefreshParameters();
 
         maxwell3d.regs.draw.begin = parameters[0];
         maxwell3d.regs.draw_auto_stride = parameters[1];
         maxwell3d.regs.draw_auto_byte_count = parameters[2];
 
-        if (maxwell3d.ShouldExecute()) {
-            maxwell3d.draw_manager->DrawArray(
-                maxwell3d.regs.draw.topology, 0,
-                maxwell3d.regs.draw_auto_byte_count / maxwell3d.regs.draw_auto_stride, 0, 1);
-        }
+        maxwell3d.draw_manager->DrawArray(
+            maxwell3d.regs.draw.topology, 0,
+            maxwell3d.regs.draw_auto_byte_count / maxwell3d.regs.draw_auto_stride, 0, 1);
     }
 };
 
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