655275378d
A dedicated renderer using Citro3D would likely allow for better much better graphical performances.
149 lines
4.2 KiB
C
149 lines
4.2 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#ifdef SDL_THREAD_N3DS
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/* Thread management routines for SDL */
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#include "../SDL_systhread.h"
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/* N3DS has very limited RAM (128MB), so we put a limit on thread stack size. */
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#define N3DS_THREAD_STACK_SIZE_MAX (16 * 1024)
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#define N3DS_THREAD_STACK_SIZE_DEFAULT (4 * 1024)
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#define N3DS_THREAD_PRIORITY_LOW 0x3F /**< Minimum priority */
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#define N3DS_THREAD_PRIORITY_MEDIUM 0x2F /**< Slightly higher than main thread (0x30) */
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#define N3DS_THREAD_PRIORITY_HIGH 0x19 /**< High priority for non-video work */
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#define N3DS_THREAD_PRIORITY_TIME_CRITICAL 0x18 /**< Highest priority */
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static size_t GetStackSize(size_t requested_size);
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static void
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ThreadEntry(void *arg)
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{
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SDL_RunThread((SDL_Thread *) arg);
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threadExit(0);
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}
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#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
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#error "SDL_PASSED_BEGINTHREAD_ENDTHREAD is not supported on N3DS"
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#endif
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int
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SDL_SYS_CreateThread(SDL_Thread *thread)
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{
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s32 priority = N3DS_THREAD_PRIORITY_MEDIUM;
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size_t stack_size = GetStackSize(thread->stacksize);
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thread->handle = threadCreate(ThreadEntry,
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thread,
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stack_size,
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priority,
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-1,
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false);
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if (thread->handle == NULL) {
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return SDL_SetError("Couldn't create thread");
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}
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return 0;
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}
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static size_t
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GetStackSize(size_t requested_size)
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{
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if (requested_size == 0) {
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return N3DS_THREAD_STACK_SIZE_DEFAULT;
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}
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if (requested_size > N3DS_THREAD_STACK_SIZE_MAX) {
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SDL_LogWarn(SDL_LOG_CATEGORY_SYSTEM,
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"Requested a thread size of %zu,"
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" falling back to the maximum supported of %zu\n",
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requested_size,
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N3DS_THREAD_STACK_SIZE_MAX);
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requested_size = N3DS_THREAD_STACK_SIZE_MAX;
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}
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return requested_size;
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}
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void
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SDL_SYS_SetupThread(const char *name)
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{
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return;
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}
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SDL_threadID
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SDL_ThreadID(void)
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{
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u32 thread_ID = 0;
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svcGetThreadId(&thread_ID, CUR_THREAD_HANDLE);
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return (SDL_threadID) thread_ID;
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}
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int
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SDL_SYS_SetThreadPriority(SDL_ThreadPriority sdl_priority)
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{
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s32 svc_priority;
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switch (sdl_priority) {
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case SDL_THREAD_PRIORITY_LOW:
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svc_priority = N3DS_THREAD_PRIORITY_LOW;
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break;
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case SDL_THREAD_PRIORITY_NORMAL:
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svc_priority = N3DS_THREAD_PRIORITY_MEDIUM;
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break;
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case SDL_THREAD_PRIORITY_HIGH:
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svc_priority = N3DS_THREAD_PRIORITY_HIGH;
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break;
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case SDL_THREAD_PRIORITY_TIME_CRITICAL:
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svc_priority = N3DS_THREAD_PRIORITY_TIME_CRITICAL;
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break;
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default:
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svc_priority = N3DS_THREAD_PRIORITY_MEDIUM;
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}
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return (int) svcSetThreadPriority(CUR_THREAD_HANDLE, svc_priority);
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}
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void
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SDL_SYS_WaitThread(SDL_Thread *thread)
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{
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Result res = threadJoin(thread->handle, U64_MAX);
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/*
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Detached threads can be waited on, but should NOT be cleaned manually
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as it would result in a fatal error.
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*/
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if (R_SUCCEEDED(res) && SDL_AtomicGet(&thread->state) != SDL_THREAD_STATE_DETACHED) {
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threadFree(thread->handle);
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}
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}
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void
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SDL_SYS_DetachThread(SDL_Thread *thread)
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{
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threadDetach(thread->handle);
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}
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#endif /* SDL_THREAD_N3DS */
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/* vi: set sts=4 ts=4 sw=4 expandtab: */
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