Pikachuxxxx’s gists

Pikachuxxxx / .$PROFILE

Created August 31, 2025 05:48

	Set-PSReadlineOption -HistorySavePath "$env:USERPROFILE\Documents\PowerShell_history.txt"
	Set-PSReadlineOption -MaximumHistoryCount 10000
	Set-PSReadlineOption -HistoryNoDuplicates
	Set-PSReadLineOption -PredictionSource History

	oh-my-posh init pwsh --config https://github.com/JanDeDobbeleer/oh-my-posh/blob/main/themes/slim.omp.json \| Invoke-Expression

Pikachuxxxx / whyIloveCJumptablesAndMacros.c

Last active August 19, 2025 18:49

Razix RHI C macro magic for clean Jumptables based API and support C++ style with profiling

	// Why I love C and Jumptables:

	#define rzRHI_DestroyDescriptorHeap g_RHI.DestroyDescriptorHeap
	#define rzRHI_CreateDescriptorTable g_RHI.CreateDescriptorTable
	#define rzRHI_DestroyDescriptorTable g_RHI.DestroyDescriptorTable


	#if !RZ_PROFILER_ENABLED
	#if defined(RAZIX_RHI_USE_RESOURCE_MANAGER_HANDLES) && defined(__cplusplus)
	#define rzRHI_BeginCmdBuf(cb) g_RHI.BeginCmdBuf(RZResourceManager::Get().getCommandBufferResource(cb))

Pikachuxxxx / depth_clamp_api_test.lua

Last active August 19, 2025 18:51

Love2D new setDepthClamp API tests

	local love = require("love")

	-- Test case for setDepthClamp function
	local TestDepthClamp = {}

	function love.conf(t)
	t.renderers = {"opengl"}
	end

	function TestDepthClamp:load()

Pikachuxxxx / vkquery.cpp

Created August 6, 2025 06:26

Vulkan test app to play with TimeQueries

	#include <vulkan/vulkan.h>
	#include <iostream>
	#include <vector>
	#include <stdexcept>
	#include <chrono>
	#include <cassert>

	// Macro for VkQuery timing
	#define VK_TIME_START(device, cmdBuffer, queryPool, queryIndex) \
	vkCmdResetQueryPool(cmdBuffer, queryPool, queryIndex, 1); \

Pikachuxxxx / fibo.asm

Last active June 1, 2025 07:08

ARM64 fibo asm

Pikachuxxxx / CPU-GPU Bound Debug.txt

Created May 31, 2025 18:59

Fishbone diagrams to help debug CPU/GPU bound issues based on Bruce Waggoner saving voyager 1 presentation

	// Inspired By: https://www.youtube.com/watch?v=E6TS1c8KWFA
	CPU‐Bound Performance Issues
	\
	\ Draw Call Count
	\ \
	\ \ Too many state changes per frame
	\ \ Small batches (lots of tiny draw calls)
	\
	\ Synchronization
	\ \

Pikachuxxxx / mangohud.conf

Created May 29, 2025 18:41

mangohud conf to collect game stats

	# MangoHud.conf
	output_folder=/home/
	output_file=true
	output_format=csv
	output_pipe=false

	# Logging control
	log_duration=120 # Log for 2 minutes (120 seconds)
	log_start=F4 # Trigger logging with F4
	log_performance=true # Enable logging

Pikachuxxxx / mmap.uml

Created May 26, 2025 02:12

deep dive into mmap for CPU and GPU mem alloc

	@startuml
	title mmap() System Call Flow

	actor UserApp
	participant KernelVFS as "Kernel VFS"
	participant KernelMM as "Kernel Memory Manager"
	participant Driver as "Device Driver (if any)"
	participant ShmemFS as "Shared Memory Filesystem (shmem)"
	participant KernelFS as "Kernel Filesystem"

Pikachuxxxx / c_cpp_lambda_callback.cpp

Last active May 18, 2025 11:19

Based on an Insomniac's Engine programmer's blog, this is a trick I learned from him.

	#include <iostream>
	#include <utility>

	void callback_test(void* userdata, void* path) {
	std::cout << "Callback function called with path: "
	<< static_cast<const char*>(path)
	<< " and userdata: "
	<< static_cast<const char*>(userdata) << std::endl;
	}

Pikachuxxxx / VulkanMemoryThoughts.txt

Last active April 24, 2025 20:39

Some thoughts about Vulkan memory allocation and drivers stuff

	so usage will tell what are it's memory requirements, then we select the heap to allocate it from by comparing
	the memory requirements for all available heaps in the physical device?

	so vkGetBufferMemory erquirements takes in usage flags and returns which memoryType to use but not the Heap Index because that can be
	implicitly inferered frmo memorytype?

	so we check for compatible memortypes and return that index

	vkGetBufferMemoryRequirements(VkDevice device, VkBuffer buffer, VkMemoryRequirements* pMemoryRequirements)
	This call returns a VkMemoryRequirements structure, which includes:

Phani Srikar Pikachuxxxx