SDL  2.0
SDL_emscriptenmouse.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 
22 
23 #include "../../SDL_internal.h"
24 
25 #if SDL_VIDEO_DRIVER_EMSCRIPTEN
26 
27 #include <emscripten/emscripten.h>
28 #include <emscripten/html5.h>
29 
30 #include "SDL_emscriptenmouse.h"
31 
32 #include "../../events/SDL_mouse_c.h"
33 #include "SDL_assert.h"
34 
35 static SDL_Cursor*
36 Emscripten_CreateCursorFromString(const char* cursor_str, SDL_bool is_custom)
37 {
39  Emscripten_CursorData *curdata;
40 
41  cursor = SDL_calloc(1, sizeof(SDL_Cursor));
42  if (cursor) {
43  curdata = (Emscripten_CursorData *) SDL_calloc(1, sizeof(*curdata));
44  if (!curdata) {
46  SDL_free(cursor);
47  return NULL;
48  }
49 
50  curdata->system_cursor = cursor_str;
51  curdata->is_custom = is_custom;
52  cursor->driverdata = curdata;
53  }
54  else {
56  }
57 
58  return cursor;
59 }
60 
61 static SDL_Cursor*
62 Emscripten_CreateDefaultCursor()
63 {
64  return Emscripten_CreateCursorFromString("default", SDL_FALSE);
65 }
66 
67 static SDL_Cursor*
68 Emscripten_CreateCursor(SDL_Surface* surface, int hot_x, int hot_y)
69 {
70  const char *cursor_url = NULL;
71  SDL_Surface *conv_surf;
72 
73  conv_surf = SDL_ConvertSurfaceFormat(surface, SDL_PIXELFORMAT_ABGR8888, 0);
74 
75  if (!conv_surf) {
76  return NULL;
77  }
78 
79  cursor_url = (const char *)EM_ASM_INT({
80  var w = $0;
81  var h = $1;
82  var hot_x = $2;
83  var hot_y = $3;
84  var pixels = $4;
85 
86  var canvas = document.createElement("canvas");
87  canvas.width = w;
88  canvas.height = h;
89 
90  var ctx = canvas.getContext("2d");
91 
92  var image = ctx.createImageData(w, h);
93  var data = image.data;
94  var src = pixels >> 2;
95  var dst = 0;
96  var num;
97  if (typeof CanvasPixelArray !== 'undefined' && data instanceof CanvasPixelArray) {
98  // IE10/IE11: ImageData objects are backed by the deprecated CanvasPixelArray,
99  // not UInt8ClampedArray. These don't have buffers, so we need to revert
100  // to copying a byte at a time. We do the undefined check because modern
101  // browsers do not define CanvasPixelArray anymore.
102  num = data.length;
103  while (dst < num) {
104  var val = HEAP32[src]; // This is optimized. Instead, we could do {{{ makeGetValue('buffer', 'dst', 'i32') }}};
105  data[dst ] = val & 0xff;
106  data[dst+1] = (val >> 8) & 0xff;
107  data[dst+2] = (val >> 16) & 0xff;
108  data[dst+3] = (val >> 24) & 0xff;
109  src++;
110  dst += 4;
111  }
112  } else {
113  var data32 = new Int32Array(data.buffer);
114  num = data32.length;
115  data32.set(HEAP32.subarray(src, src + num));
116  }
117 
118  ctx.putImageData(image, 0, 0);
119  var url = hot_x === 0 && hot_y === 0
120  ? "url(" + canvas.toDataURL() + "), auto"
121  : "url(" + canvas.toDataURL() + ") " + hot_x + " " + hot_y + ", auto";
122 
123  var urlBuf = _malloc(url.length + 1);
124  stringToUTF8(url, urlBuf, url.length + 1);
125 
126  return urlBuf;
127  }, surface->w, surface->h, hot_x, hot_y, conv_surf->pixels);
128 
129  SDL_FreeSurface(conv_surf);
130 
131  return Emscripten_CreateCursorFromString(cursor_url, SDL_TRUE);
132 }
133 
134 static SDL_Cursor*
135 Emscripten_CreateSystemCursor(SDL_SystemCursor id)
136 {
137  const char *cursor_name = NULL;
138 
139  switch(id) {
141  cursor_name = "default";
142  break;
144  cursor_name = "text";
145  break;
147  cursor_name = "wait";
148  break;
150  cursor_name = "crosshair";
151  break;
153  cursor_name = "progress";
154  break;
156  cursor_name = "nwse-resize";
157  break;
159  cursor_name = "nesw-resize";
160  break;
162  cursor_name = "ew-resize";
163  break;
165  cursor_name = "ns-resize";
166  break;
168  break;
170  cursor_name = "not-allowed";
171  break;
173  cursor_name = "pointer";
174  break;
175  default:
176  SDL_assert(0);
177  return NULL;
178  }
179 
180  return Emscripten_CreateCursorFromString(cursor_name, SDL_FALSE);
181 }
182 
183 static void
184 Emscripten_FreeCursor(SDL_Cursor* cursor)
185 {
186  Emscripten_CursorData *curdata;
187  if (cursor) {
188  curdata = (Emscripten_CursorData *) cursor->driverdata;
189 
190  if (curdata != NULL) {
191  if (curdata->is_custom) {
192  SDL_free((char *)curdata->system_cursor);
193  }
194  SDL_free(cursor->driverdata);
195  }
196 
197  SDL_free(cursor);
198  }
199 }
200 
201 static int
202 Emscripten_ShowCursor(SDL_Cursor* cursor)
203 {
204  Emscripten_CursorData *curdata;
205  if (SDL_GetMouseFocus() != NULL) {
206  if(cursor && cursor->driverdata) {
207  curdata = (Emscripten_CursorData *) cursor->driverdata;
208 
209  if(curdata->system_cursor) {
210  EM_ASM_INT({
211  if (Module['canvas']) {
212  Module['canvas'].style['cursor'] = Module['Pointer_stringify']($0);
213  }
214  return 0;
215  }, curdata->system_cursor);
216  }
217  }
218  else {
219  EM_ASM(
220  if (Module['canvas']) {
221  Module['canvas'].style['cursor'] = 'none';
222  }
223  );
224  }
225  }
226  return 0;
227 }
228 
229 static void
230 Emscripten_WarpMouse(SDL_Window* window, int x, int y)
231 {
232  SDL_Unsupported();
233 }
234 
235 static int
236 Emscripten_SetRelativeMouseMode(SDL_bool enabled)
237 {
238  /* TODO: pointer lock isn't actually enabled yet */
239  if(enabled) {
240  if(emscripten_request_pointerlock(NULL, 1) >= EMSCRIPTEN_RESULT_SUCCESS) {
241  return 0;
242  }
243  } else {
244  if(emscripten_exit_pointerlock() >= EMSCRIPTEN_RESULT_SUCCESS) {
245  return 0;
246  }
247  }
248  return -1;
249 }
250 
251 void
253 {
254  SDL_Mouse* mouse = SDL_GetMouse();
255 
256  mouse->CreateCursor = Emscripten_CreateCursor;
257  mouse->ShowCursor = Emscripten_ShowCursor;
258  mouse->FreeCursor = Emscripten_FreeCursor;
259  mouse->WarpMouse = Emscripten_WarpMouse;
260  mouse->CreateSystemCursor = Emscripten_CreateSystemCursor;
261  mouse->SetRelativeMouseMode = Emscripten_SetRelativeMouseMode;
262 
263  SDL_SetDefaultCursor(Emscripten_CreateDefaultCursor());
264 }
265 
266 void
268 {
269 }
270 
271 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
272 
273 /* vi: set ts=4 sw=4 expandtab: */
274 
#define SDL_ConvertSurfaceFormat
SDL_Mouse * SDL_GetMouse(void)
Definition: SDL_mouse.c:112
int(* ShowCursor)(SDL_Cursor *cursor)
Definition: SDL_mouse_c.h:52
GLuint num
GLeglImageOES image
Definition: SDL_opengl.h:2148
GLenum GLenum dst
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1574
int(* SetRelativeMouseMode)(SDL_bool enabled)
Definition: SDL_mouse_c.h:67
void Emscripten_FiniMouse()
GLfloat GLfloat GLfloat GLfloat h
EGLSurface surface
Definition: eglext.h:248
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
GLenum src
SDL_Cursor *(* CreateCursor)(SDL_Surface *surface, int hot_x, int hot_y)
Definition: SDL_mouse_c.h:46
GLuint GLfloat * val
void * pixels
Definition: SDL_surface.h:75
#define SDL_FreeSurface
#define SDL_free
GLubyte GLubyte GLubyte GLubyte w
SDL_SystemCursor
Cursor types for SDL_CreateSystemCursor().
Definition: SDL_mouse.h:46
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1574
GLint GLint GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: SDL_opengl.h:1572
void SDL_SetDefaultCursor(SDL_Cursor *cursor)
Definition: SDL_mouse.c:101
GLenum GLenum GLsizei const GLuint GLboolean enabled
SDL_Cursor * cursor
void(* FreeCursor)(SDL_Cursor *cursor)
Definition: SDL_mouse_c.h:58
#define SDL_assert(condition)
Definition: SDL_assert.h:169
#define NULL
Definition: begin_code.h:164
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
SDL_bool
Definition: SDL_stdinc.h:139
#define SDL_GetMouseFocus
#define SDL_calloc
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
The type used to identify a window.
Definition: SDL_sysvideo.h:73
void(* WarpMouse)(SDL_Window *window, int x, int y)
Definition: SDL_mouse_c.h:61
SDL_Cursor *(* CreateSystemCursor)(SDL_SystemCursor id)
Definition: SDL_mouse_c.h:49
void * driverdata
Definition: SDL_mouse_c.h:33
#define SDL_Unsupported()
Definition: SDL_error.h:53
void Emscripten_InitMouse()
int uint32_t uint32_t uint32_t uint32_t uint32_t int drmModeModeInfoPtr mode int uint32_t uint32_t uint32_t uint32_t int32_t hot_x
Definition: SDL_kmsdrmsym.h:55
EGLContext ctx
Definition: eglext.h:208