360 lines
10 KiB
C
360 lines
10 KiB
C
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//========================================================================
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// GLFW - An OpenGL framework
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// File: amigaos_joystick.c
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// Platforms: AmigaOS, MorphOS
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// API version: 2.6
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// WWW: http://glfw.sourceforge.net
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Camilla Berglund
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//
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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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//
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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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//
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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
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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#include "internal.h"
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//************************************************************************
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//**** GLFW internal functions ****
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//************************************************************************
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//========================================================================
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// _glfwSendJoyReadRequest() - Send joystick read request
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//========================================================================
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static void _glfwSendJoyReadRequest( void )
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{
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// Send read request
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_glfwJoy.GameIO->io_Command = GPD_READEVENT;
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_glfwJoy.GameIO->io_Flags = 0;
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_glfwJoy.GameIO->io_Data = (APTR) &_glfwJoy.GameEvent;
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_glfwJoy.GameIO->io_Length = sizeof(struct InputEvent);
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SendIO( (struct IORequest *) _glfwJoy.GameIO );
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}
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//========================================================================
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// _glfwInitJoysticks() - Initialize joystick interface
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//========================================================================
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void _glfwInitJoysticks( void )
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{
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unsigned char controller_type = 0;
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struct GamePortTrigger game_trigger;
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// Start by clearing all handles
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_glfwJoy.GameMP = NULL;
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_glfwJoy.GameIO = NULL;
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_glfwJoy.Present = 0;
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_glfwJoy.GameDeviceOpen = 0;
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// Create gameport.device message port
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if( !(_glfwJoy.GameMP = CreatePort( NULL, 0 )) )
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{
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return;
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}
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// Create gameport.device I/O request
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if( !( _glfwJoy.GameIO = (struct IOStdReq *)
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CreateExtIO(_glfwJoy.GameMP, sizeof(struct IOStdReq)) ) )
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{
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_glfwTerminateJoysticks();
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return;
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}
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// Open gameport.device (unit 1 = port 2)
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_glfwJoy.GameIO->io_Message.mn_Node.ln_Type = NT_UNKNOWN;
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if( OpenDevice( "gameport.device", 1,
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(struct IORequest *)_glfwJoy.GameIO, 0 ) )
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{
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_glfwTerminateJoysticks();
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return;
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}
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_glfwJoy.GameDeviceOpen = 1;
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// Start critical section
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Forbid();
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// Find out if anyone else is using the stick
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_glfwJoy.GameIO->io_Command = GPD_ASKCTYPE;
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_glfwJoy.GameIO->io_Flags = IOF_QUICK;
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_glfwJoy.GameIO->io_Data = (APTR) &controller_type;
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_glfwJoy.GameIO->io_Length = 1;
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DoIO( (struct IORequest *) _glfwJoy.GameIO );
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// Was it already allocated?
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if( controller_type != GPCT_NOCONTROLLER )
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{
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Permit();
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_glfwTerminateJoysticks();
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return;
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}
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// Allocate joystick
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controller_type = GPCT_ABSJOYSTICK;
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_glfwJoy.GameIO->io_Command = GPD_SETCTYPE;
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_glfwJoy.GameIO->io_Flags = IOF_QUICK;
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_glfwJoy.GameIO->io_Data = (APTR) &controller_type;
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_glfwJoy.GameIO->io_Length = 1;
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DoIO( (struct IORequest *) _glfwJoy.GameIO );
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_glfwJoy.Present = 1;
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// End critical section
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Permit();
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// Set trigger conditions
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game_trigger.gpt_Keys = GPTF_UPKEYS | GPTF_DOWNKEYS;
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game_trigger.gpt_XDelta = 1;
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game_trigger.gpt_YDelta = 1;
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game_trigger.gpt_Timeout = (UWORD) 0xFFFF; // ~20 minutes
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_glfwJoy.GameIO->io_Command = GPD_SETTRIGGER;
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_glfwJoy.GameIO->io_Flags = IOF_QUICK;
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_glfwJoy.GameIO->io_Data = (APTR) &game_trigger;
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_glfwJoy.GameIO->io_Length = (LONG) sizeof(struct GamePortTrigger);
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DoIO( (struct IORequest *) _glfwJoy.GameIO );
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// Flush buffer
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_glfwJoy.GameIO->io_Command = CMD_CLEAR;
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_glfwJoy.GameIO->io_Flags = IOF_QUICK;
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_glfwJoy.GameIO->io_Data = NULL;
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_glfwJoy.GameIO->io_Length = 0;
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DoIO( (struct IORequest *) _glfwJoy.GameIO );
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// Send joystick read request (asynchronous)
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_glfwSendJoyReadRequest();
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}
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//========================================================================
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// _glfwTerminateJoysticks() - Close all opened joystick handles
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//========================================================================
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void _glfwTerminateJoysticks( void )
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{
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unsigned char controller_type;
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// Remove any remaining asynchronous messages
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if( _glfwJoy.GameIO )
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{
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if( !CheckIO( (struct IORequest *)_glfwJoy.GameIO ) )
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{
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AbortIO( (struct IORequest *)_glfwJoy.GameIO );
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WaitIO( (struct IORequest *)_glfwJoy.GameIO );
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}
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}
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// Deallocate joystick
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if( _glfwJoy.Present )
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{
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controller_type = GPCT_NOCONTROLLER;
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_glfwJoy.GameIO->io_Command = GPD_SETCTYPE;
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_glfwJoy.GameIO->io_Flags = IOF_QUICK;
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_glfwJoy.GameIO->io_Data = (APTR) &controller_type;
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_glfwJoy.GameIO->io_Length = 1;
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DoIO( (struct IORequest *) _glfwJoy.GameIO );
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_glfwJoy.Present = 0;
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}
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// Close gameport.device
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if( _glfwJoy.GameDeviceOpen )
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{
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CloseDevice( (struct IORequest *) _glfwJoy.GameIO );
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_glfwJoy.GameDeviceOpen = 0;
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}
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// Delete I/O request
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if( _glfwJoy.GameIO )
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{
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DeleteExtIO( (struct IORequest *) _glfwJoy.GameIO );
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_glfwJoy.GameIO = NULL;
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}
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// Delete message port
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if( _glfwJoy.GameMP )
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{
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DeletePort( _glfwJoy.GameMP );
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_glfwJoy.GameMP = NULL;
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}
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}
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//========================================================================
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// _glfwPollJoystickEvents() - Empty joystick event queue
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//========================================================================
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static void _glfwPollJoystickEvents( void )
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{
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int got_event = 0;
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// Do we have a stick?
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if( !_glfwJoy.Present )
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{
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return;
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}
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// Empty the message queue
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while( GetMsg( _glfwJoy.GameMP ) != NULL )
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{
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// Flag: we got an event
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got_event = 1;
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switch( _glfwJoy.GameEvent.ie_Code )
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{
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// Left button pressed
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case IECODE_LBUTTON:
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_glfwJoy.Button[ 0 ] = 1;
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break;
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// Left button released
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case (IECODE_LBUTTON | IECODE_UP_PREFIX):
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_glfwJoy.Button[ 0 ] = 0;
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break;
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// Right button pressed
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case IECODE_RBUTTON:
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_glfwJoy.Button[ 1 ] = 1;
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break;
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// Right button released
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case (IECODE_RBUTTON | IECODE_UP_PREFIX):
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_glfwJoy.Button[ 1 ] = 0;
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break;
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// Axis event
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case IECODE_NOBUTTON:
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_glfwJoy.Axis[ 0 ] = (float) _glfwJoy.GameEvent.ie_X;
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_glfwJoy.Axis[ 1 ] = (float) -_glfwJoy.GameEvent.ie_Y;
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break;
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default:
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break;
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}
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}
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// Did we get any events?
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if( got_event )
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{
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// Send joystick read request (asynchronous)
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_glfwSendJoyReadRequest();
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}
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}
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//************************************************************************
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//**** Platform implementation functions ****
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//************************************************************************
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//========================================================================
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// _glfwPlatformGetJoystickParam() - Determine joystick capabilities
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//========================================================================
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int _glfwPlatformGetJoystickParam( int joy, int param )
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{
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// Is joystick present?
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if( joy != GLFW_JOYSTICK_1 || !_glfwJoy.Present )
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{
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return 0;
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}
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// We assume that the joystick is connected, and has two axes and two
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// buttons (since there is no way of retrieving this information from
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// AmigaOS)
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switch( param )
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{
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case GLFW_PRESENT:
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return GL_TRUE;
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case GLFW_AXES:
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return 2;
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case GLFW_BUTTONS:
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return 2;
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default:
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break;
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}
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return 0;
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}
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//========================================================================
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// _glfwPlatformGetJoystickPos() - Get joystick axis positions
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//========================================================================
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int _glfwPlatformGetJoystickPos( int joy, float *pos, int numaxes )
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{
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int k;
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// Is joystick present?
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if( joy != GLFW_JOYSTICK_1 || !_glfwJoy.Present )
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{
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return 0;
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}
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// Update joystick state
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_glfwPollJoystickEvents();
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// Copy axis position information to output vector
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if( numaxes > 2 )
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{
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numaxes = 2;
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}
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for( k = 0; k < numaxes; ++ k )
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{
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pos[ k ] = _glfwJoy.Axis[ k ];
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}
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return numaxes;
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}
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//========================================================================
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// _glfwPlatformGetJoystickButtons() - Get joystick button states
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//========================================================================
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int _glfwPlatformGetJoystickButtons( int joy, unsigned char *buttons,
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int numbuttons )
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{
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int k;
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// Is joystick present?
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if( joy != GLFW_JOYSTICK_1 || !_glfwJoy.Present )
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{
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return 0;
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}
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// Update joystick state
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_glfwPollJoystickEvents();
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// Copy button information to output vector
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if( numbuttons > 2 )
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{
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numbuttons = 2;
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}
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for( k = 0; k < numbuttons; ++ k )
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{
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buttons[ k ] = _glfwJoy.Button[ k ];
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}
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return numbuttons;
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}
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