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7f52a770d9
So far the joy_masks array allowed several joystick drivers for a single target to each have different joy_read return values. However this meant that every call to joy_read implied an additional joy_masks lookup to post-process the return value. Given that almost all targets only come with a single joystick driver this seems an inappropriate overhead. Therefore now the target header files contain constants matching the return value of the joy_read of the joystick driver(s) on that target. If there indeed are several joystick drivers for a single target they must agree on a common return value for joy_read. In some cases this was alredy the case as there's a "natural" return value for joy_read. However a few joystick drivers need to be adjusted. This may cause some overhead inside the driver. But that is for sure smaller than the overhead introduced by the joy_masks lookup before. !!! ToDo !!! The following three joystick drivers become broken with this commit and need to be adjusted: - atrmj8.s - c64-numpad.s - vic20-stdjoy.s
85 lines
4.0 KiB
PHP
85 lines
4.0 KiB
PHP
;/*****************************************************************************/
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;/* */
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;/* joy-kernel.inc */
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;/* */
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;/* Internally used joystick functions */
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;/* */
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;/* */
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;/* */
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;/* (C) 2002-2006, Ullrich von Bassewitz */
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;/* Römerstraße 52 */
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;/* D-70794 Filderstadt */
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;/* EMail: uz@cc65.org */
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;/* */
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;/* */
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;/* This software is provided 'as-is', without any expressed 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 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 */
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;/* be misrepresented as being the original software. */
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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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;------------------------------------------------------------------------------
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; Driver header stuff
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.struct JOY_HDR
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ID .byte 3 ; $6A, $6F, $79 ("joy")
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VERSION .byte 1 ; Interface version
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LIBREF .addr ; Library reference
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JUMPTAB .struct
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INSTALL .addr ; INSTALL routine
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UNINSTALL .addr ; UNINSTALL routine
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COUNT .addr ; COUNT routine
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READ .addr ; READ routine
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IRQ .addr ; IRQ routine
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.endstruct
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.endstruct
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;------------------------------------------------------------------------------
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; The JOY API version, stored in JOY_HDR::VERSION
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JOY_API_VERSION = $03
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;------------------------------------------------------------------------------
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; Variables
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.global _joy_drv ; Pointer to driver
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.global _joy_masks
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;------------------------------------------------------------------------------
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; Driver entry points
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.global joy_install
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.global joy_uninstall
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.global joy_count
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.global joy_read
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;------------------------------------------------------------------------------
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; C callable functions
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.global _joy_load_driver
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.global _joy_unload
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.global _joy_install
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.global _joy_uninstall
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.global _joy_count
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.global _joy_read
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.global _joy_clear_ptr
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