From a0b6f49aef0c8d97a61cdb8a109486d489c3aa8d Mon Sep 17 00:00:00 2001
From: Nielsbishere <n@osomi.net>
Date: Thu, 28 Mar 2024 00:33:12 +0100
Subject: [PATCH] Added C support

---
 include/pix3_c.h | 118 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 include/pix3_c.h

diff --git a/include/pix3_c.h b/include/pix3_c.h
new file mode 100644
index 0000000..bf158ac
--- /dev/null
+++ b/include/pix3_c.h
@@ -0,0 +1,118 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+//Minimal C version for D3D12 profiling, no CPU profiling supported.
+
+#pragma once
+#include <stdint.h>
+
+#ifndef __d3d12_h__
+    #error d3d12.h is required before including pix3_c.h
+#endif
+
+#define WINPIX_EVENT_PIX3BLOB_VERSION 2
+#define D3D12_EVENT_METADATA WINPIX_EVENT_PIX3BLOB_VERSION
+
+//Bits 10-19 (10 bits)
+static const uint64_t PIXEventsTypeWriteMask = 0x00000000000003FF;
+static const uint64_t PIXEventsTypeBitShift = 10;
+
+//Bits 20-63 (44 bits)
+static const uint64_t PIXEventsTimestampWriteMask = 0x00000FFFFFFFFFFF;
+static const uint64_t PIXEventsTimestampBitShift = 20;
+
+typedef enum PIXEventType
+{
+    PIXEvent_EndEvent_OnContext = 0x010,
+    PIXEvent_BeginEvent_OnContext_VarArgs = 0x011,
+    PIXEvent_SetMarker_OnContext_VarArgs = 0x017
+} PIXEventType;
+
+inline uint64_t PIXEncodeEventInfo(uint64_t timestamp, PIXEventType eventType)
+{
+    return ((timestamp & PIXEventsTimestampWriteMask) << PIXEventsTimestampBitShift) |
+        (((uint64_t)eventType & PIXEventsTypeWriteMask) << PIXEventsTypeBitShift);
+}
+
+inline void PIXCopyEventStringArgumentSlow(uint64_t** destination, const uint64_t* limit, const uint8_t *argument)
+{
+    for(; *destination < limit; ++*destination)
+    {
+        uint64_t c = argument[0];
+
+        for(uint64_t i = 0; i < 8; ++i) {   //Ok fine, we'll make compiler unroll this
+
+            uint8_t next = argument[i];
+
+            if(!next) {
+                **destination = c;
+                *destination += 1;
+                return;
+            }
+
+            c |= (uint64_t)next << (i << 3);
+        }
+        
+        **destination = c;
+    }
+}
+
+inline void PIXSerializeEvent(PIXEventType type, uint64_t color, const char* message, uint64_t data[64], uint32_t* size) {
+
+    //We start with event info and color
+
+    const uint64_t* start = data;
+    data[0] = PIXEncodeEventInfo(0, type);
+    data[1] = color;
+    data += 2;
+
+    //Then we serialize the string into it
+
+    PIXCopyEventStringArgumentSlow(&data, data + 64, (const uint8_t*) message);
+
+    *size = (uint32_t)((uint8_t*)data - (uint8_t*)start);
+}
+
+inline void PIXSetMarkerCommandList(ID3D12GraphicsCommandList* commandList, uint64_t color, const char* message) {
+
+    uint64_t data[64];
+    uint32_t size = 0;
+    PIXSerializeEvent(PIXEvent_SetMarker_OnContext_VarArgs, color, message, data, &size);
+
+    commandList->lpVtbl->SetMarker(commandList, D3D12_EVENT_METADATA, data, size);
+}
+
+inline void PIXSetMarkerCommandQueue(ID3D12CommandQueue* commandQueue, uint64_t color, const char* message) {
+
+    uint64_t data[64];
+	uint32_t size = 0;
+    PIXSerializeEvent(PIXEvent_SetMarker_OnContext_VarArgs, color, message, data, &size);
+
+    commandQueue->lpVtbl->SetMarker(commandQueue, D3D12_EVENT_METADATA, data, size);
+}
+
+inline void PIXBeginEventCommandList(ID3D12GraphicsCommandList* commandList, uint64_t color, const char* message) {
+
+    uint64_t data[64];
+	uint32_t size = 0;
+    PIXSerializeEvent(PIXEvent_BeginEvent_OnContext_VarArgs, color, message, data, &size);
+
+    commandList->lpVtbl->BeginEvent(commandList, D3D12_EVENT_METADATA, data, size);
+}
+
+inline void PIXBeginEventCommandQueue(ID3D12CommandQueue* commandQueue, uint64_t color, const char* message) {
+
+    uint64_t data[64];
+	uint32_t size = 0;
+    PIXSerializeEvent(PIXEvent_BeginEvent_OnContext_VarArgs, color, message, data, &size);
+
+    commandQueue->lpVtbl->BeginEvent(commandQueue, D3D12_EVENT_METADATA, data, size);
+}
+
+inline void PIXEndEventCommandList(ID3D12GraphicsCommandList* commandList) {
+    commandList->lpVtbl->EndEvent(commandList);
+}
+
+inline void PIXEndEventCommandQueue(ID3D12CommandQueue* commandQueue) {
+    commandQueue->lpVtbl->EndEvent(commandQueue);
+}