driver/input: most of the input code

driver/input/consts.h

@@ -0,0 +1,163 @@
+#pragma once
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+// Key codes of the IBM PC (American) keyboard
+typedef enum {
+	input_Key_Unknown = -1, // Unhandled key
+	input_Key_A       = 0,  // The A key
+	input_Key_B,            // The B key
+	input_Key_C,            // The C key
+	input_Key_D,            // The D key
+	input_Key_E,            // The E key
+	input_Key_F,            // The F key
+	input_Key_G,            // The G key
+	input_Key_H,            // The H key
+	input_Key_I,            // The I key
+	input_Key_J,            // The J key
+	input_Key_K,            // The K key
+	input_Key_L,            // The L key
+	input_Key_M,            // The M key
+	input_Key_N,            // The N key
+	input_Key_O,            // The O key
+	input_Key_P,            // The P key
+	input_Key_Q,            // The Q key
+	input_Key_R,            // The R key
+	input_Key_S,            // The S key
+	input_Key_T,            // The T key
+	input_Key_U,            // The U key
+	input_Key_V,            // The V key
+	input_Key_W,            // The W key
+	input_Key_X,            // The X key
+	input_Key_Y,            // The Y key
+	input_Key_Z,            // The Z key
+	input_Key_Num0,         // The 0 key
+	input_Key_Num1,         // The 1 key
+	input_Key_Num2,         // The 2 key
+	input_Key_Num3,         // The 3 key
+	input_Key_Num4,         // The 4 key
+	input_Key_Num5,         // The 5 key
+	input_Key_Num6,         // The 6 key
+	input_Key_Num7,         // The 7 key
+	input_Key_Num8,         // The 8 key
+	input_Key_Num9,         // The 9 key
+	input_Key_Escape,       // The Escape key
+	input_Key_LControl,     // The left Control key
+	input_Key_LShift,       // The left Shift key
+	input_Key_LAlt,         // The left Alt key
+	input_Key_LSuper,       // The left Super (Windows) key
+	input_Key_RControl,     // The right Control key
+	input_Key_RShift,       // The right Shift key
+	input_Key_RAlt,         // The right Alt key
+	input_Key_RSuper,       // The right Super (Windows) key
+	input_Key_Menu,         // The Menu key
+	input_Key_LBracket,     // The [ key
+	input_Key_RBracket,     // The ] key
+	input_Key_Semicolon,    // The ; key
+	input_Key_Comma,        // The , key
+	input_Key_Period,       // The . key
+	input_Key_Quote,        // The ' key
+	input_Key_Slash,        // The / key
+	input_Key_Backslash,    // The \ key
+	input_Key_Tilde,        // The ~ key
+	input_Key_Equal,        // The = key
+	input_Key_Hyphen,       // The - key (hyphen)
+	input_Key_Space,        // The Space key
+	input_Key_Enter,        // The Enter/Return keys
+	input_Key_Backspace,    // The Backspace key
+	input_Key_Tab,          // The Tabulation key
+	input_Key_PageUp,       // The Page up key
+	input_Key_PageDown,     // The Page down key
+	input_Key_End,          // The End key
+	input_Key_Home,         // The Home key
+	input_Key_Insert,       // The Insert key
+	input_Key_Delete,       // The Delete key
+	input_Key_Add,          // The + key
+	input_Key_Subtract,     // The - key (minus, usually from numpad)
+	input_Key_Multiply,     // The * key
+	input_Key_Divide,       // The / key
+	input_Key_Left,         // Left arrow
+	input_Key_Right,        // Right arrow
+	input_Key_Up,           // Up arrow
+	input_Key_Down,         // Down arrow
+	input_Key_Numpad0,      // The numpad 0 key
+	input_Key_Numpad1,      // The numpad 1 key
+	input_Key_Numpad2,      // The numpad 2 key
+	input_Key_Numpad3,      // The numpad 3 key
+	input_Key_Numpad4,      // The numpad 4 key
+	input_Key_Numpad5,      // The numpad 5 key
+	input_Key_Numpad6,      // The numpad 6 key
+	input_Key_Numpad7,      // The numpad 7 key
+	input_Key_Numpad8,      // The numpad 8 key
+	input_Key_Numpad9,      // The numpad 9 key
+	input_Key_F1,           // The F1 key
+	input_Key_F2,           // The F2 key
+	input_Key_F3,           // The F3 key
+	input_Key_F4,           // The F4 key
+	input_Key_F5,           // The F5 key
+	input_Key_F6,           // The F6 key
+	input_Key_F7,           // The F7 key
+	input_Key_F8,           // The F8 key
+	input_Key_F9,           // The F9 key
+	input_Key_F10,          // The F10 key
+	input_Key_F11,          // The F11 key
+	input_Key_F12,          // The F12 key
+	input_Key_F13,          // The F13 key
+	input_Key_F14,          // The F14 key
+	input_Key_F15,          // The F15 key
+	input_Key_Pause,        // The Pause key
+
+	input_Key_Count, // Keep last - the total number of keyboard keys
+} input_Key;
+
+
+typedef enum {
+	input_MouseButton_Left,   // Left mouse button
+	input_MouseButton_Right,  // Right mouse button
+	input_MouseButton_Middle, // Middle (scrollwheel) button
+	input_MouseButton_4,      // 4th mouse button
+	input_MouseButton_5,      // 5th mouse button
+
+	input_MouseButton_Count // Keep last - the number of mouse buttons
+} input_MouseButton;
+
+
+typedef enum {
+	input_EventType_MouseMoved,          // Mouse has been moved (data event.MouseMove)
+	input_EventType_MouseButtonPressed,  // Mouse button has been pressed (data event.MouseButton)
+	input_EventType_MouseButtonReleased, // Mouse button has been released (data event.MouseButton)
+	input_EventType_KeyPressed,          // Keyboard key has been pressed (data event.Key)
+	input_EventType_KeyReleased,         // Keyboard key has been released (data event.Key)
+	input_EventType_Count                // Number of the event types
+} input_EventType;
+
+
+typedef struct {
+	input_EventType Type;
+
+	union {
+		struct {
+			int X, Y; // New position of the mouse
+		} MouseMove;
+
+		struct {
+			input_MouseButton Button; // Button
+			int               X, Y;   // Position of the mouse
+		} MouseButton;
+
+		struct {
+			input_Key Key;                        // Key code
+			bool      Control, Shift, Alt, Super; // Is the modifier keys pressed?
+		} Key;
+	};
+} input_Event;
+
+
+#ifdef __cplusplus
+}
+#endif

driver/input/input.c

@@ -0,0 +1,53 @@
+
+#include "input.h"
+#include "source.h"
+#include "internal.h"
+#include "../../util/minmax.h"
+#include <stdint.h>
+
+
+int      __input_CursorX, __input_CursorY;
+int      __input_DesktopWidth, __input_DesktopHeight;
+uint64_t __input_KeyMask[input_Key_Count / 64 + 1], __input_MouseMask[input_MouseButton_Count / 64 + 1];
+// FIXME you're supposed to disable interrupt/lock mutex accessing these variables
+
+
+bool input_KeyPressed(input_Key key) {
+	return __input_KeyMask[key / 64] & (1ull << key % 64);
+}
+
+bool input_MousePressed(input_MouseButton key) {
+	return __input_MouseMask[key / 64] & (1ull << key & 64);
+}
+
+void input_MousePosition(int *x, int *y) {
+	*x = __input_CursorX;
+	*y = __input_CursorY;
+}
+
+void input_DesktopSize(int *x, int *y) {
+	*x = __input_DesktopWidth;
+	*y = __input_DesktopHeight;
+}
+
+void input_source_PressKey(input_Key key) { __input_KeyMask[key / 64] |= (1ull << key % 64); }
+void input_source_ReleaseKey(input_Key key) { __input_KeyMask[key / 64] &= ~(1ull << key % 64); }
+
+void input_source_PressMouse(input_MouseButton key) { __input_MouseMask[key / 64] |= (1ull << key & 64); }
+void input_source_ReleaseMouse(input_MouseButton key) { __input_MouseMask[key / 64] &= ~(1ull << key & 64); }
+
+void input_source_MoveMouse(int x, int y) {
+	__input_CursorX = intminmax(__input_CursorX + x, 0, __input_DesktopWidth);
+	__input_CursorY = intminmax(__input_CursorY + y, 0, __input_DesktopHeight);
+}
+void input_source_PositionMouse(int x, int y) {
+	__input_CursorX = intminmax(x, 0, __input_DesktopWidth);
+	__input_CursorY = intminmax(y, 0, __input_DesktopHeight);
+}
+
+void input_source_SetDesktopSize(int x, int y) {
+	__input_DesktopWidth  = x;
+	__input_DesktopHeight = y;
+	__input_CursorX       = intminmax(__input_CursorX, 0, __input_DesktopWidth);
+	__input_CursorY       = intminmax(__input_CursorY, 0, __input_DesktopHeight);
+}

driver/input/input.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <stdbool.h>
+#include "consts.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+// input_KeyPressed tells if a given key is present and pressed.
+bool input_KeyPressed(input_Key key);
+
+// input_MousePressed tells if a given mouse button is pressed.
+bool input_MousePressed(input_MouseButton key);
+
+// input_MouseButton returns the mouse position.
+void input_MousePosition(int *x, int *y);
+
+// input_DesktopSize returns the size of the rectangular area to which
+// the mouse cursor is bounded.
+//
+// Don't use this to do anything not related to mouse position, e.g., get the screen size.
+void input_DesktopSize(int *x, int *y);
+
+
+#ifdef __cplusplus
+}
+#endif

driver/input/internal.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "consts.h"
+#include "stdint.h"
+
+
+extern int      __input_CursorX, __input_CursorY;
+extern int      __input_DesktopWidth, __input_DesktopHeight;
+extern uint64_t __input_KeyMask[input_Key_Count / 64 + 1], __input_MouseMask[input_MouseButton_Count / 64 + 1]; // bitsets for keys and mouse buttons

driver/input/source.h

@@ -0,0 +1,29 @@
+#pragma once
+
+// This file is intended only for input source devices like a PS/2 driver.
+
+#include <stdbool.h>
+#include "consts.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+void input_source_PressKey(input_Key key);
+void input_source_ReleaseKey(input_Key key);
+
+void input_source_PressMouse(input_MouseButton key);
+void input_source_ReleaseMouse(input_MouseButton key);
+
+void input_source_MoveMouse(int x, int y);     // Moves mouse cursor by a relative amount
+void input_source_PositionMouse(int x, int y); // Moves mouse cursor to an absolute position
+
+// input_source_SetDesktopSize sets the size of the rectangular area to which
+// the mouse cursor is bounded.
+void input_source_SetDesktopSize(int x, int y);
+
+
+#ifdef __cplusplus
+}
+#endif

graphics/graphics.c

@@ -4,6 +4,8 @@
 #include "color.h"
 #include "internal_helpers.h"
 #include "unifont.h"
+#include "../driver/input/input.h"
+#include "../driver/input/source.h"
 #include "../runtime/stdio.h"
 #include "../util/minmax.h"
 #include "../util/stack.h"
@@ -40,7 +42,6 @@ uint32_t graphics_Doublebuffer[2048 * 1024];
 
 #define MOUSE_OVERLAY_SIZE 32
 xcursor_ChunkHeader_Image *graphics_Cursor;
-int                        graphics_MouseCursorX, graphics_MouseCursorY;
 static int                 __lastMouseX, __lastMouseY; // Last of mouse **IMAGE** position
 static int                 __lastMouseSizeX, __lastMouseSizeY;
 static uint32_t            __mouseOverlay[MOUSE_OVERLAY_SIZE * MOUSE_OVERLAY_SIZE];
@@ -121,8 +122,8 @@ void graphics_Init() {
 	graphics_Framebuffer     = (void *)graphics_Doublebuffer;
 	graphics_CursorX = graphics_CursorY = 0;
 
-	graphics_MouseCursorX = graphics_SystemVideoMode.Width / 2;
-	graphics_MouseCursorY = graphics_SystemVideoMode.Height / 2;
+	input_source_SetDesktopSize(graphics_SystemVideoMode.Width, graphics_SystemVideoMode.Height);
+	input_source_PositionMouse(graphics_SystemVideoMode.Width / 2, graphics_SystemVideoMode.Height / 2);
 
 	stack_InitBuffered(__invalidated, __invalidated_buffer, sizeof(__invalidated_buffer));
 	__invalidated_screen = false;
@@ -178,8 +179,11 @@ static void __graphics__UpdateMouse() {
 	if (!graphics_Cursor)
 		return;
 
-	int imgX = graphics_MouseCursorX - graphics_Cursor->xhot + 1;
-	int imgY = graphics_MouseCursorY - graphics_Cursor->yhot + 1;
+	int x, y;
+	input_MousePosition(&x, &y);
+
+	int imgX = x - graphics_Cursor->xhot + 1;
+	int imgY = y - graphics_Cursor->yhot + 1;
 	if (imgX != __lastMouseX || imgY != __lastMouseY || graphics_Cursor->width != __lastMouseSizeX || graphics_Cursor->height != __lastMouseSizeY) { // moved
 		__graphics_CopyBuffer32(
 			__mouseOverlay, 0, 0, MOUSE_OVERLAY_SIZE, MOUSE_OVERLAY_SIZE,

graphics/graphics.h

@@ -29,7 +29,6 @@ extern uint64_t           graphics_FramebufferSize;
 extern HelosGraphics_Mode graphics_SystemVideoMode; // system video mode
 
 extern xcursor_ChunkHeader_Image *graphics_Cursor; // mouse cursor image
-extern int                        graphics_MouseCursorX, graphics_MouseCursorY;
 
 
 // Init() must be called prior to ExitBootServices()

kernel/kmain.c

@@ -11,6 +11,7 @@
 #include "../interrupt/syscall.h"
 #include "../driver/irq/pic/pic.h"
 #include "../driver/irq/pic/ps2/ps2.h"
+#include "../driver/input/source.h"
 
 #include "../execformat/pe/reloc.h"
 void execformat_pe_ReadSystemHeader(execformat_pe_PortableExecutable *pe);
@@ -85,8 +86,7 @@ SYSV_ABI void kMain() {
 			d              = queue_PopByte(&irq_pic_ps2_QueueMouse);
 			moveY          = d - ((state << 3) & 0x100);
 
-			graphics_MouseCursorX = minmax(graphics_MouseCursorX + *((int *)&moveX), 0, graphics_SystemVideoMode.Width - 1);
-			graphics_MouseCursorY = minmax(graphics_MouseCursorY - *((int *)&moveY), 0, graphics_SystemVideoMode.Height - 1);
+			input_source_MoveMouse(moveX, -moveY);
 
 			if (irq_pic_ps2_Mouse4Bytes)
 				queue_PopByte(&irq_pic_ps2_QueueMouse);

util/minmax.h

@@ -32,3 +32,12 @@ static inline int intmax3(int x, int y, int z) {
 	else
 		return z;
 }
+
+static inline int intminmax(int x, int min, int max) {
+	if (x < min)
+		return min;
+	else if (x > max)
+		return max;
+	else
+		return x;
+}