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resolution and scaling

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copy 2014-02-19 01:49:22 +01:00
parent f47d41e5e6
commit b08340cf73
1 changed files with 53 additions and 12 deletions
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65
src/ps2.js
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@ -53,7 +53,10 @@ function PS2(dev, keyboard, mouse)
sample_rate = 100,
/** @type {number} */
resolution = 1,
resolution = 4,
/** @type {boolean} */
scaling2 = false,
/** @type {number} */
last_mouse_packet = -1,
@ -106,8 +109,8 @@ function PS2(dev, keyboard, mouse)
{
if(have_mouse && enable_mouse)
{
mouse_delta_x += delta_x;
mouse_delta_y += delta_y;
mouse_delta_x += delta_x * resolution / 4 | 0;
mouse_delta_y += delta_y * resolution / 4 | 0;
if(enable_mouse_stream)
{
@ -146,13 +149,22 @@ function PS2(dev, keyboard, mouse)
(mouse_delta_y < 0) << 5 |
(mouse_delta_x < 0) << 4 |
1 << 3 |
mouse_clicks;
mouse_clicks,
delta_x = mouse_delta_x,
delta_y = mouse_delta_y;
last_mouse_packet = Date.now();
if(scaling2)
{
// only in automatic packets, not 0xEB requests
delta_x = apply_scaling2(delta_x);
delta_y = apply_scaling2(delta_y);
}
mouse_buffer.push(info_byte);
mouse_buffer.push(mouse_delta_x);
mouse_buffer.push(mouse_delta_y);
mouse_buffer.push(delta_x);
mouse_buffer.push(delta_y);
dbg_log("adding mouse packets:" + [info_byte, mouse_delta_x, mouse_delta_y], LOG_PS2);
@ -162,6 +174,29 @@ function PS2(dev, keyboard, mouse)
mouse_irq();
}
function apply_scaling2(n)
{
// http://www.computer-engineering.org/ps2mouse/#Inputs.2C_Resolution.2C_and_Scaling
var abs = Math.abs(n),
sign = n >> 31;
switch(abs)
{
case 0:
case 1:
case 3:
return n;
case 2:
return sign;
case 4:
return 6 * sign;
case 5:
return 9 * sign;
default:
return n << 1;
}
}
this.destroy = function()
{
if(have_keyboard)
@ -298,7 +333,8 @@ function PS2(dev, keyboard, mouse)
if(write_byte > 3)
{
dbg_log("invalid resolution, resetting to 1", LOG_PS2);
resolution = 4;
dbg_log("invalid resolution, resetting to 4", LOG_PS2);
}
else
{
@ -337,17 +373,21 @@ function PS2(dev, keyboard, mouse)
switch(write_byte)
{
case 0xE6:
// set scaling to 1:1
// set scaling to 1:1
dbg_log("Scaling 1:1", LOG_PS2);
scaling2 = false;
break;
case 0xE7:
// set scaling to 2:1
// set scaling to 2:1
dbg_log("Scaling 2:1", LOG_PS2);
scaling2 = true;
break;
case 0xE8:
// set mouse resolution
next_read_resolution = true;
break;
case 0xE9:
// status request - send one packet
// status request - send one packet
send_mouse_packet();
break;
case 0xEB:
@ -355,7 +395,7 @@ function PS2(dev, keyboard, mouse)
dbg_log("unimplemented request single packet", LOG_PS2);
break;
case 0xF2:
// MouseID Byte
// MouseID Byte
mouse_buffer.push(0);
mouse_buffer.push(0);
break;
@ -377,7 +417,8 @@ function PS2(dev, keyboard, mouse)
// reset defaults
enable_mouse_stream = false;
sample_rate = 100;
// ... resolution, scaling
scaling2 = false;
resolution = 4;
break;
case 0xFF:
// reset, send completion code