mirror of https://github.com/Genymobile/scrcpy
Implement HID gamepad
Implement the HID protocol for gamepads, that will be used in further commits by the AOA and UHID gamepad processor implementations. PR #5270 <https://github.com/Genymobile/scrcpy/pull/5270>
This commit is contained in:
Romain Vimont
parent
f4d1e49ad9
commit
a59c6df4b7
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@ -32,6 +32,7 @@ src = [
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'src/screen.c',
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'src/server.c',
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'src/version.c',
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'src/hid/hid_gamepad.c',
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'src/hid/hid_keyboard.c',
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'src/hid/hid_mouse.c',
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'src/trait/frame_source.c',
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@ -5,7 +5,7 @@
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#include <stdint.h>
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#define SC_HID_MAX_SIZE 8
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#define SC_HID_MAX_SIZE 15
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struct sc_hid_input {
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uint16_t hid_id;
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@ -0,0 +1,451 @@
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#include "hid_gamepad.h"
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#include <assert.h>
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#include <inttypes.h>
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#include "util/binary.h"
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#include "util/log.h"
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// 2x2 bytes for left stick (X, Y)
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// 2x2 bytes for right stick (Z, Rz)
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// 2x2 bytes for L2/R2 triggers
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// 2 bytes for buttons + padding,
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// 1 byte for hat switch (dpad) + padding
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#define SC_HID_GAMEPAD_EVENT_SIZE 15
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// The ->buttons field stores the state for all buttons, but only some of them
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// (the 16 LSB) must be transmitted "as is". The DPAD (hat switch) buttons are
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// stored locally in the MSB of this field, but not transmitted as is: they are
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// transformed to generate another specific byte.
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#define SC_HID_BUTTONS_MASK 0xFFFF
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// outside SC_HID_BUTTONS_MASK
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#define SC_GAMEPAD_BUTTONS_BIT_DPAD_UP UINT32_C(0x10000)
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#define SC_GAMEPAD_BUTTONS_BIT_DPAD_DOWN UINT32_C(0x20000)
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#define SC_GAMEPAD_BUTTONS_BIT_DPAD_LEFT UINT32_C(0x40000)
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#define SC_GAMEPAD_BUTTONS_BIT_DPAD_RIGHT UINT32_C(0x80000)
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/**
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* Gamepad descriptor manually crafted to transmit the input reports.
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*
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* The HID specification is available here:
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* <https://www.usb.org/document-library/device-class-definition-hid-111>
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*
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* The HID Usage Tables is also useful:
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* <https://www.usb.org/document-library/hid-usage-tables-15>
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*/
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static const uint8_t SC_HID_GAMEPAD_REPORT_DESC[] = {
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// Usage Page (Generic Desktop)
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0x05, 0x01,
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// Usage (Gamepad)
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0x09, 0x05,
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// Collection (Application)
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0xA1, 0x01,
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// Collection (Physical)
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0xA1, 0x00,
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// Usage Page (Generic Desktop)
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0x05, 0x01,
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// Usage (X) Left stick x
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0x09, 0x30,
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// Usage (Y) Left stick y
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0x09, 0x31,
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// Usage (Z) Right stick x
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0x09, 0x32,
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// Usage (Rz) Right stick y
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0x09, 0x35,
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// Logical Minimum (0)
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0x15, 0x00,
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// Logical Maximum (65535)
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// Cannot use 26 FF FF because 0xFFFF is interpreted as signed 16-bit
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0x27, 0xFF, 0xFF, 0x00, 0x00, // little-endian
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// Report Size (16)
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0x75, 0x10,
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// Report Count (4)
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0x95, 0x04,
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// Input (Data, Variable, Absolute): 4 bytes (X, Y, Z, Rz)
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0x81, 0x02,
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// Usage Page (Simulation Controls)
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0x05, 0x02,
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// Usage (Brake)
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0x09, 0xC5,
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// Usage (Accelerator)
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0x09, 0xC4,
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// Logical Minimum (0)
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0x15, 0x00,
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// Logical Maximum (32767)
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0x26, 0xFF, 0x7F,
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// Report Size (16)
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0x75, 0x10,
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// Report Count (2)
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0x95, 0x02,
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// Input (Data, Variable, Absolute): 2 bytes (L2, R2)
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0x81, 0x02,
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// Usage Page (Buttons)
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0x05, 0x09,
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// Usage Minimum (1)
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0x19, 0x01,
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// Usage Maximum (16)
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0x29, 0x10,
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// Logical Minimum (0)
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0x15, 0x00,
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// Logical Maximum (1)
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0x25, 0x01,
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// Report Count (16)
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0x95, 0x10,
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// Report Size (1)
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0x75, 0x01,
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// Input (Data, Variable, Absolute): 16 buttons bits
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0x81, 0x02,
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// Usage Page (Generic Desktop)
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0x05, 0x01,
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// Usage (Hat switch)
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0x09, 0x39,
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// Logical Minimum (1)
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0x15, 0x01,
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// Logical Maximum (8)
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0x25, 0x08,
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// Report Size (4)
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0x75, 0x04,
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// Report Count (1)
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0x95, 0x01,
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// Input (Data, Variable, Null State): 4-bit value
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0x81, 0x42,
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// End Collection
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0xC0,
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// End Collection
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0xC0,
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};
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/**
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* A gamepad HID input report is 15 bytes long:
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* - bytes 0-3: left stick state
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* - bytes 4-7: right stick state
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* - bytes 8-11: L2/R2 triggers state
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* - bytes 12-13: buttons state
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* - bytes 14: hat switch position (dpad)
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*
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* +---------------+
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* byte 0: |. . . . . . . .|
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* | | left stick x (0-65535, little-endian)
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* byte 1: |. . . . . . . .|
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* +---------------+
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* byte 2: |. . . . . . . .|
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* | | left stick y (0-65535, little-endian)
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* byte 3: |. . . . . . . .|
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* +---------------+
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* byte 4: |. . . . . . . .|
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* | | right stick x (0-65535, little-endian)
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* byte 5: |. . . . . . . .|
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* +---------------+
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* byte 6: |. . . . . . . .|
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* | | right stick y (0-65535, little-endian)
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* byte 7: |. . . . . . . .|
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* +---------------+
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* byte 8: |. . . . . . . .|
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* | | L2 trigger (0-32767, little-endian)
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* byte 9: |0 . . . . . . .|
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* +---------------+
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* byte 10: |. . . . . . . .|
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* | | R2 trigger (0-32767, little-endian)
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* byte 11: |0 . . . . . . .|
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* +---------------+
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*
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* ,--------------- SC_GAMEPAD_BUTTON_RIGHT_SHOULDER
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* | ,------------- SC_GAMEPAD_BUTTON_LEFT_SHOULDER
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* | |
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* | | ,--------- SC_GAMEPAD_BUTTON_NORTH
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* | | | ,------- SC_GAMEPAD_BUTTON_WEST
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* | | | |
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* | | | | ,--- SC_GAMEPAD_BUTTON_EAST
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* | | | | | ,- SC_GAMEPAD_BUTTON_SOUTH
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* v v v v v v
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* +---------------+
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* byte 12: |. . 0 . . 0 . .|
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* | | Buttons (16-bit little-endian)
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* byte 13: |0 . . . . . 0 0|
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* +---------------+
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* ^ ^ ^ ^ ^
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* | | | | |
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* | | | | |
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* | | | | `----- SC_GAMEPAD_BUTTON_BACK
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* | | | `------- SC_GAMEPAD_BUTTON_START
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* | | `--------- SC_GAMEPAD_BUTTON_GUIDE
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* | `----------- SC_GAMEPAD_BUTTON_LEFT_STICK
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* `------------- SC_GAMEPAD_BUTTON_RIGHT_STICK
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*
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* +---------------+
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* byte 14: |0 0 0 . . . . .| hat switch (dpad) position (0-8)
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* +---------------+
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* 9 possible positions and their values:
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* 8 1 2
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* 7 0 3
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* 6 5 4
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* (8 is top-left, 1 is top, 2 is top-right, etc.)
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*/
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static void
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sc_hid_gamepad_slot_init(struct sc_hid_gamepad_slot *slot,
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uint32_t gamepad_id) {
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assert(gamepad_id != SC_GAMEPAD_ID_INVALID);
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slot->gamepad_id = gamepad_id;
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slot->buttons = 0;
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slot->axis_left_x = 0;
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slot->axis_left_y = 0;
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slot->axis_right_x = 0;
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slot->axis_right_y = 0;
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slot->axis_left_trigger = 0;
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slot->axis_right_trigger = 0;
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}
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static ssize_t
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sc_hid_gamepad_slot_find(struct sc_hid_gamepad *hid, uint32_t gamepad_id) {
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for (size_t i = 0; i < SC_MAX_GAMEPADS; ++i) {
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if (gamepad_id == hid->slots[i].gamepad_id) {
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// found
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return i;
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}
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}
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return -1;
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}
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void
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sc_hid_gamepad_init(struct sc_hid_gamepad *hid) {
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for (size_t i = 0; i < SC_MAX_GAMEPADS; ++i) {
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hid->slots[i].gamepad_id = SC_GAMEPAD_ID_INVALID;
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}
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}
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static inline uint16_t
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sc_hid_gamepad_slot_get_id(size_t slot_idx) {
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assert(slot_idx < SC_MAX_GAMEPADS);
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return SC_HID_ID_GAMEPAD_FIRST + slot_idx;
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}
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bool
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sc_hid_gamepad_generate_open(struct sc_hid_gamepad *hid,
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struct sc_hid_open *hid_open,
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uint32_t gamepad_id) {
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assert(gamepad_id != SC_GAMEPAD_ID_INVALID);
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ssize_t slot_idx = sc_hid_gamepad_slot_find(hid, SC_GAMEPAD_ID_INVALID);
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if (slot_idx == -1) {
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LOGW("No gamepad slot available for new gamepad %" PRIu32, gamepad_id);
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return false;
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}
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sc_hid_gamepad_slot_init(&hid->slots[slot_idx], gamepad_id);
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uint16_t hid_id = sc_hid_gamepad_slot_get_id(slot_idx);
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hid_open->hid_id = hid_id;
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hid_open->report_desc = SC_HID_GAMEPAD_REPORT_DESC;
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hid_open->report_desc_size = sizeof(SC_HID_GAMEPAD_REPORT_DESC);
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return true;
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}
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bool
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sc_hid_gamepad_generate_close(struct sc_hid_gamepad *hid,
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struct sc_hid_close *hid_close,
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uint32_t gamepad_id) {
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assert(gamepad_id != SC_GAMEPAD_ID_INVALID);
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ssize_t slot_idx = sc_hid_gamepad_slot_find(hid, gamepad_id);
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if (slot_idx == -1) {
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LOGW("Unknown gamepad removed %" PRIu32, gamepad_id);
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return false;
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}
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hid->slots[slot_idx].gamepad_id = SC_GAMEPAD_ID_INVALID;
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uint16_t hid_id = sc_hid_gamepad_slot_get_id(slot_idx);
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hid_close->hid_id = hid_id;
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return true;
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}
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static uint8_t
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sc_hid_gamepad_get_dpad_value(uint32_t buttons) {
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// Value depending on direction:
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// 8 1 2
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// 7 0 3
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// 6 5 4
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if (buttons & SC_GAMEPAD_BUTTONS_BIT_DPAD_UP) {
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if (buttons & SC_GAMEPAD_BUTTONS_BIT_DPAD_LEFT) {
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return 8;
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}
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if (buttons & SC_GAMEPAD_BUTTONS_BIT_DPAD_RIGHT) {
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return 2;
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}
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return 1;
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}
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if (buttons & SC_GAMEPAD_BUTTONS_BIT_DPAD_DOWN) {
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if (buttons & SC_GAMEPAD_BUTTONS_BIT_DPAD_LEFT) {
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return 6;
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}
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if (buttons & SC_GAMEPAD_BUTTONS_BIT_DPAD_RIGHT) {
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return 4;
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}
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return 5;
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}
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if (buttons & SC_GAMEPAD_BUTTONS_BIT_DPAD_LEFT) {
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return 7;
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}
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if (buttons & SC_GAMEPAD_BUTTONS_BIT_DPAD_RIGHT) {
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return 3;
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}
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return 0;
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}
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static void
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sc_hid_gamepad_event_from_slot(uint16_t hid_id,
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const struct sc_hid_gamepad_slot *slot,
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struct sc_hid_input *hid_input) {
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hid_input->hid_id = hid_id;
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hid_input->size = SC_HID_GAMEPAD_EVENT_SIZE;
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uint8_t *data = hid_input->data;
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// Values must be written in little-endian
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sc_write16le(data, slot->axis_left_x);
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sc_write16le(data + 2, slot->axis_left_y);
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sc_write16le(data + 4, slot->axis_right_x);
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sc_write16le(data + 6, slot->axis_right_y);
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sc_write16le(data + 8, slot->axis_left_trigger);
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sc_write16le(data + 10, slot->axis_right_trigger);
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sc_write16le(data + 12, slot->buttons & SC_HID_BUTTONS_MASK);
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data[14] = sc_hid_gamepad_get_dpad_value(slot->buttons);
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}
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static uint32_t
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sc_hid_gamepad_get_button_id(enum sc_gamepad_button button) {
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switch (button) {
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case SC_GAMEPAD_BUTTON_SOUTH:
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return 0x0001;
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case SC_GAMEPAD_BUTTON_EAST:
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return 0x0002;
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case SC_GAMEPAD_BUTTON_WEST:
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return 0x0008;
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case SC_GAMEPAD_BUTTON_NORTH:
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return 0x0010;
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case SC_GAMEPAD_BUTTON_BACK:
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return 0x0400;
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case SC_GAMEPAD_BUTTON_GUIDE:
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return 0x1000;
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case SC_GAMEPAD_BUTTON_START:
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return 0x0800;
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case SC_GAMEPAD_BUTTON_LEFT_STICK:
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return 0x2000;
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case SC_GAMEPAD_BUTTON_RIGHT_STICK:
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return 0x4000;
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case SC_GAMEPAD_BUTTON_LEFT_SHOULDER:
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return 0x0040;
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case SC_GAMEPAD_BUTTON_RIGHT_SHOULDER:
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return 0x0080;
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case SC_GAMEPAD_BUTTON_DPAD_UP:
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return SC_GAMEPAD_BUTTONS_BIT_DPAD_UP;
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case SC_GAMEPAD_BUTTON_DPAD_DOWN:
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return SC_GAMEPAD_BUTTONS_BIT_DPAD_DOWN;
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case SC_GAMEPAD_BUTTON_DPAD_LEFT:
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return SC_GAMEPAD_BUTTONS_BIT_DPAD_LEFT;
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case SC_GAMEPAD_BUTTON_DPAD_RIGHT:
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return SC_GAMEPAD_BUTTONS_BIT_DPAD_RIGHT;
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default:
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// unknown button, ignore
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return 0;
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}
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}
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bool
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sc_hid_gamepad_generate_input_from_button(struct sc_hid_gamepad *hid,
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struct sc_hid_input *hid_input,
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const struct sc_gamepad_button_event *event) {
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if ((event->button < 0) || (event->button > 15)) {
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return false;
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}
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uint32_t gamepad_id = event->gamepad_id;
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ssize_t slot_idx = sc_hid_gamepad_slot_find(hid, gamepad_id);
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if (slot_idx == -1) {
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LOGW("Axis event for unknown gamepad %" PRIu32, gamepad_id);
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return false;
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}
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assert(slot_idx < SC_MAX_GAMEPADS);
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struct sc_hid_gamepad_slot *slot = &hid->slots[slot_idx];
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uint32_t button = sc_hid_gamepad_get_button_id(event->button);
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if (!button) {
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// unknown button, ignore
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return false;
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}
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if (event->action == SC_ACTION_DOWN) {
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slot->buttons |= button;
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} else {
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assert(event->action == SC_ACTION_UP);
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slot->buttons &= ~button;
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}
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uint16_t hid_id = sc_hid_gamepad_slot_get_id(slot_idx);
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sc_hid_gamepad_event_from_slot(hid_id, slot, hid_input);
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return true;
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}
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bool
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sc_hid_gamepad_generate_input_from_axis(struct sc_hid_gamepad *hid,
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struct sc_hid_input *hid_input,
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const struct sc_gamepad_axis_event *event) {
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uint32_t gamepad_id = event->gamepad_id;
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ssize_t slot_idx = sc_hid_gamepad_slot_find(hid, gamepad_id);
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if (slot_idx == -1) {
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LOGW("Button event for unknown gamepad %" PRIu32, gamepad_id);
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return false;
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}
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assert(slot_idx < SC_MAX_GAMEPADS);
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struct sc_hid_gamepad_slot *slot = &hid->slots[slot_idx];
|
||||
|
||||
// [-32768 to 32767] -> [0 to 65535]
|
||||
#define AXIS_RESCALE(V) (uint16_t) (((int32_t) V) + 0x8000)
|
||||
switch (event->axis) {
|
||||
case SC_GAMEPAD_AXIS_LEFTX:
|
||||
slot->axis_left_x = AXIS_RESCALE(event->value);
|
||||
break;
|
||||
case SC_GAMEPAD_AXIS_LEFTY:
|
||||
slot->axis_left_y = AXIS_RESCALE(event->value);
|
||||
break;
|
||||
case SC_GAMEPAD_AXIS_RIGHTX:
|
||||
slot->axis_right_x = AXIS_RESCALE(event->value);
|
||||
break;
|
||||
case SC_GAMEPAD_AXIS_RIGHTY:
|
||||
slot->axis_right_y = AXIS_RESCALE(event->value);
|
||||
break;
|
||||
case SC_GAMEPAD_AXIS_LEFT_TRIGGER:
|
||||
// Trigger is always positive between 0 and 32767
|
||||
slot->axis_left_trigger = MAX(0, event->value);
|
||||
break;
|
||||
case SC_GAMEPAD_AXIS_RIGHT_TRIGGER:
|
||||
// Trigger is always positive between 0 and 32767
|
||||
slot->axis_right_trigger = MAX(0, event->value);
|
||||
break;
|
||||
default:
|
||||
return false;
|
||||
}
|
||||
|
||||
uint16_t hid_id = sc_hid_gamepad_slot_get_id(slot_idx);
|
||||
sc_hid_gamepad_event_from_slot(hid_id, slot, hid_input);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
|
@ -0,0 +1,53 @@
|
|||
#ifndef SC_HID_GAMEPAD_H
|
||||
#define SC_HID_GAMEPAD_H
|
||||
|
||||
#include "common.h"
|
||||
|
||||
#include <stdbool.h>
|
||||
|
||||
#include "hid/hid_event.h"
|
||||
#include "input_events.h"
|
||||
|
||||
#define SC_MAX_GAMEPADS 8
|
||||
#define SC_HID_ID_GAMEPAD_FIRST 3
|
||||
#define SC_HID_ID_GAMEPAD_LAST (SC_HID_ID_GAMEPAD_FIRST + SC_MAX_GAMEPADS - 1)
|
||||
|
||||
struct sc_hid_gamepad_slot {
|
||||
uint32_t gamepad_id;
|
||||
uint32_t buttons;
|
||||
uint16_t axis_left_x;
|
||||
uint16_t axis_left_y;
|
||||
uint16_t axis_right_x;
|
||||
uint16_t axis_right_y;
|
||||
uint16_t axis_left_trigger;
|
||||
uint16_t axis_right_trigger;
|
||||
};
|
||||
|
||||
struct sc_hid_gamepad {
|
||||
struct sc_hid_gamepad_slot slots[SC_MAX_GAMEPADS];
|
||||
};
|
||||
|
||||
void
|
||||
sc_hid_gamepad_init(struct sc_hid_gamepad *hid);
|
||||
|
||||
bool
|
||||
sc_hid_gamepad_generate_open(struct sc_hid_gamepad *hid,
|
||||
struct sc_hid_open *hid_open,
|
||||
uint32_t gamepad_id);
|
||||
|
||||
bool
|
||||
sc_hid_gamepad_generate_close(struct sc_hid_gamepad *hid,
|
||||
struct sc_hid_close *hid_close,
|
||||
uint32_t gamepad_id);
|
||||
|
||||
bool
|
||||
sc_hid_gamepad_generate_input_from_button(struct sc_hid_gamepad *hid,
|
||||
struct sc_hid_input *hid_input,
|
||||
const struct sc_gamepad_button_event *event);
|
||||
|
||||
bool
|
||||
sc_hid_gamepad_generate_input_from_axis(struct sc_hid_gamepad *hid,
|
||||
struct sc_hid_input *hid_input,
|
||||
const struct sc_gamepad_axis_event *event);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue