From ba02d564f8a0b0167b96f247b6ad9d2bde05b6c8 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Sun, 15 Sep 2019 11:48:54 -0400
Subject: Video Core: initial Implementation of InstanceDraw Packaging

---
 src/video_core/engines/maxwell_3d.cpp | 74 +++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

(limited to 'src/video_core/engines/maxwell_3d.cpp')

diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index c7a3c85a0..48fc1a9e1 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -92,6 +92,10 @@ void Maxwell3D::InitializeRegisterDefaults() {
 
     // Some games (like Super Mario Odyssey) assume that SRGB is enabled.
     regs.framebuffer_srgb = 1;
+    mme_inline[MAXWELL3D_REG_INDEX(draw.vertex_end_gl)] = true;
+    mme_inline[MAXWELL3D_REG_INDEX(draw.vertex_begin_gl)] = true;
+    mme_inline[MAXWELL3D_REG_INDEX(vertex_buffer.count)] = true;
+    mme_inline[MAXWELL3D_REG_INDEX(index_array.count)] = true;
 }
 
 #define DIRTY_REGS_POS(field_name) (offsetof(Maxwell3D::DirtyRegs, field_name))
@@ -416,6 +420,76 @@ void Maxwell3D::CallMethod(const GPU::MethodCall& method_call) {
     }
 }
 
+void Maxwell3D::CallMethodFromMME(const GPU::MethodCall& method_call) {
+    const u32 method = method_call.method;
+    if (mme_inline[method]) {
+        regs.reg_array[method] = method_call.argument;
+        if (method == MAXWELL3D_REG_INDEX(vertex_buffer.count) ||
+            method == MAXWELL3D_REG_INDEX(index_array.count)) {
+            MMMEDrawMode expected_mode = method == MAXWELL3D_REG_INDEX(vertex_buffer.count)
+                                             ? MMMEDrawMode::Array
+                                             : MMMEDrawMode::Indexed;
+            u32 count = method_call.argument;
+            while (true) {
+                if (mme_draw.current_mode == MMMEDrawMode::Undefined) {
+                    mme_draw.current_mode = expected_mode;
+                    mme_draw.current_count = count;
+                    mme_draw.instance_count = 1;
+                    break;
+                } else {
+                    if (mme_draw.current_mode == expected_mode && count == mme_draw.current_count) {
+                        mme_draw.instance_count++;
+                        break;
+                    } else {
+                        FlushMMEInlineDraw();
+                    }
+                }
+            }
+        }
+    } else {
+        if (mme_draw.current_mode != MMMEDrawMode::Undefined) {
+            FlushMMEInlineDraw();
+        }
+        CallMethod(method_call);
+    }
+}
+
+void Maxwell3D::FlushMMEInlineDraw() {
+    LOG_DEBUG(HW_GPU, "called, topology={}, count={}", static_cast<u32>(regs.draw.topology.Value()),
+              regs.vertex_buffer.count);
+    ASSERT_MSG(!(regs.index_array.count && regs.vertex_buffer.count), "Both indexed and direct?");
+
+    auto debug_context = system.GetGPUDebugContext();
+
+    if (debug_context) {
+        debug_context->OnEvent(Tegra::DebugContext::Event::IncomingPrimitiveBatch, nullptr);
+    }
+
+    // Both instance configuration registers can not be set at the same time.
+    ASSERT_MSG(!regs.draw.instance_next || !regs.draw.instance_cont,
+               "Illegal combination of instancing parameters");
+
+    const bool is_indexed = mme_draw.current_mode == MMMEDrawMode::Indexed;
+    rasterizer.AccelerateDrawMultiBatch(is_indexed);
+
+    if (debug_context) {
+        debug_context->OnEvent(Tegra::DebugContext::Event::FinishedPrimitiveBatch, nullptr);
+    }
+
+    // TODO(bunnei): Below, we reset vertex count so that we can use these registers to determine if
+    // the game is trying to draw indexed or direct mode. This needs to be verified on HW still -
+    // it's possible that it is incorrect and that there is some other register used to specify the
+    // drawing mode.
+    if (is_indexed) {
+        regs.index_array.count = 0;
+    } else {
+        regs.vertex_buffer.count = 0;
+    }
+    mme_draw.current_mode = MMMEDrawMode::Undefined;
+    mme_draw.current_count = 0;
+    mme_draw.instance_count = 0;
+}
+
 void Maxwell3D::ProcessMacroUpload(u32 data) {
     ASSERT_MSG(regs.macros.upload_address < macro_memory.size(),
                "upload_address exceeded macro_memory size!");
-- 
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