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r_thread.h
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r_thread.h
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/*
** Renderer multithreading framework
** Copyright (c) 2016 Magnus Norddahl
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
*/
#pragma once
#include "r_draw.h"
#include <vector>
#include <memory>
#include <thread>
#include <mutex>
#include <condition_variable>
// Use multiple threads when drawing
EXTERN_CVAR(Int, r_multithreaded)
class PolyTriangleThreadData;
// Worker data for each thread executing drawer commands
class DrawerThread
{
public:
std::thread thread;
size_t current_queue = 0;
// Thread line index of this thread
int core = 0;
// Number of active threads
int num_cores = 1;
// NUMA node this thread belongs to
int numa_node = 0;
// Number of active NUMA nodes
int num_numa_nodes = 1;
// Active range for the numa block the cores are part of
int numa_start_y = 0;
int numa_end_y = MAXHEIGHT;
// Working buffer used by the tilted (sloped) span drawer
const uint8_t *tiltlighting[MAXWIDTH];
std::shared_ptr<PolyTriangleThreadData> poly;
size_t debug_draw_pos = 0;
// Checks if a line is rendered by this thread
bool line_skipped_by_thread(int line)
{
return line < numa_start_y || line >= numa_end_y || line % num_cores != core;
}
// The number of lines to skip to reach the first line to be rendered by this thread
int skipped_by_thread(int first_line)
{
int clip_first_line = MAX(first_line, numa_start_y);
int core_skip = (num_cores - (clip_first_line - core) % num_cores) % num_cores;
return clip_first_line + core_skip - first_line;
}
// The number of lines to be rendered by this thread
int count_for_thread(int first_line, int count)
{
count = MIN(count, numa_end_y - first_line);
int c = (count - skipped_by_thread(first_line) + num_cores - 1) / num_cores;
return MAX(c, 0);
}
// Calculate the dest address for the first line to be rendered by this thread
template<typename T>
T *dest_for_thread(int first_line, int pitch, T *dest)
{
return dest + skipped_by_thread(first_line) * pitch;
}
// The first line in the dc_temp buffer used this thread
int temp_line_for_thread(int first_line)
{
return (first_line + skipped_by_thread(first_line)) / num_cores;
}
};
// Task to be executed by each worker thread
class DrawerCommand
{
public:
virtual ~DrawerCommand() { }
virtual void Execute(DrawerThread *thread) = 0;
};
// Wait for all worker threads before executing next command
class GroupMemoryBarrierCommand : public DrawerCommand
{
public:
void Execute(DrawerThread *thread);
private:
std::mutex mutex;
std::condition_variable condition;
size_t count = 0;
};
// Copy finished rows to video memory
class MemcpyCommand : public DrawerCommand
{
public:
MemcpyCommand(void *dest, int destpitch, const void *src, int width, int height, int srcpitch, int pixelsize);
void Execute(DrawerThread *thread);
private:
void *dest;
const void *src;
int destpitch;
int width;
int height;
int srcpitch;
int pixelsize;
};
class DrawerCommandQueue;
typedef std::shared_ptr<DrawerCommandQueue> DrawerCommandQueuePtr;
class DrawerThreads
{
public:
// Runs the collected commands on worker threads
static void Execute(DrawerCommandQueuePtr queue);
// Waits for all commands to finish executing
static void WaitForWorkers();
static void ResetDebugDrawPos();
private:
DrawerThreads();
~DrawerThreads();
void StartThreads();
void StopThreads();
void WorkerMain(DrawerThread *thread);
static DrawerThreads *Instance();
std::mutex threads_mutex;
std::vector<DrawerThread> threads;
std::mutex start_mutex;
std::condition_variable start_condition;
std::vector<DrawerCommandQueuePtr> active_commands;
bool shutdown_flag = false;
std::mutex end_mutex;
std::condition_variable end_condition;
size_t tasks_left = 0;
size_t debug_draw_end = 0;
DrawerThread single_core_thread;
friend class DrawerCommandQueue;
};
class RenderMemory;
class DrawerCommandQueue
{
public:
DrawerCommandQueue(RenderMemory *memoryAllocator);
void Clear() { commands.clear(); }
// Queue command to be executed by drawer worker threads
template<typename T, typename... Types>
void Push(Types &&... args)
{
DrawerThreads *threads = DrawerThreads::Instance();
if (r_multithreaded != 0)
{
void *ptr = AllocMemory(sizeof(T));
T *command = new (ptr)T(std::forward<Types>(args)...);
commands.push_back(command);
}
else
{
T command(std::forward<Types>(args)...);
command.Execute(&threads->single_core_thread);
}
}
private:
// Allocate memory valid for the duration of a command execution
void *AllocMemory(size_t size);
std::vector<DrawerCommand *> commands;
RenderMemory *FrameMemory;
friend class DrawerThreads;
};