SDL_emscriptenmouse.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if SDL_VIDEO_DRIVER_EMSCRIPTEN
#include <emscripten/emscripten.h>
#include <emscripten/html5.h>
#include "SDL_emscriptenmouse.h"
#include "../../events/SDL_mouse_c.h"
#include "SDL_assert.h"
static SDL_Cursor*
Emscripten_CreateCursorFromString(const char* cursor_str, SDL_bool is_custom)
{
SDL_Cursor* cursor;
Emscripten_CursorData *curdata;
cursor = SDL_calloc(1, sizeof(SDL_Cursor));
if (cursor) {
curdata = (Emscripten_CursorData *) SDL_calloc(1, sizeof(*curdata));
if (!curdata) {
SDL_OutOfMemory();
SDL_free(cursor);
return NULL;
}
curdata->system_cursor = cursor_str;
curdata->is_custom = is_custom;
cursor->driverdata = curdata;
}
else {
SDL_OutOfMemory();
}
return cursor;
}
static SDL_Cursor*
Emscripten_CreateDefaultCursor()
{
return Emscripten_CreateCursorFromString("default", SDL_FALSE);
}
static SDL_Cursor*
Emscripten_CreateCursor(SDL_Surface* surface, int hot_x, int hot_y)
{
const char *cursor_url = NULL;
SDL_Surface *conv_surf;
conv_surf = SDL_ConvertSurfaceFormat(surface, SDL_PIXELFORMAT_ABGR8888, 0);
if (!conv_surf) {
return NULL;
}
cursor_url = (const char *)EM_ASM_INT({
var w = $0;
var h = $1;
var hot_x = $2;
var hot_y = $3;
var pixels = $4;
var canvas = document.createElement("canvas");
canvas.width = w;
canvas.height = h;
var ctx = canvas.getContext("2d");
var image = ctx.createImageData(w, h);
var data = image.data;
var src = pixels >> 2;
var dst = 0;
var num;
if (typeof CanvasPixelArray !== 'undefined' && data instanceof CanvasPixelArray) {
// IE10/IE11: ImageData objects are backed by the deprecated CanvasPixelArray,
// not UInt8ClampedArray. These don't have buffers, so we need to revert
// to copying a byte at a time. We do the undefined check because modern
// browsers do not define CanvasPixelArray anymore.
num = data.length;
while (dst < num) {
var val = HEAP32[src]; // This is optimized. Instead, we could do {{{ makeGetValue('buffer', 'dst', 'i32') }}};
data[dst ] = val & 0xff;
data[dst+1] = (val >> 8) & 0xff;
data[dst+2] = (val >> 16) & 0xff;
data[dst+3] = (val >> 24) & 0xff;
src++;
dst += 4;
}
} else {
var data32 = new Int32Array(data.buffer);
num = data32.length;
data32.set(HEAP32.subarray(src, src + num));
}
ctx.putImageData(image, 0, 0);
var url = hot_x === 0 && hot_y === 0
? "url(" + canvas.toDataURL() + "), auto"
: "url(" + canvas.toDataURL() + ") " + hot_x + " " + hot_y + ", auto";
var urlBuf = _malloc(url.length + 1);
stringToUTF8(url, urlBuf, url.length + 1);
return urlBuf;
}, surface->w, surface->h, hot_x, hot_y, conv_surf->pixels);
SDL_FreeSurface(conv_surf);
return Emscripten_CreateCursorFromString(cursor_url, SDL_TRUE);
}
static SDL_Cursor*
Emscripten_CreateSystemCursor(SDL_SystemCursor id)
{
const char *cursor_name = NULL;
switch(id) {
case SDL_SYSTEM_CURSOR_ARROW:
cursor_name = "default";
break;
case SDL_SYSTEM_CURSOR_IBEAM:
cursor_name = "text";
break;
case SDL_SYSTEM_CURSOR_WAIT:
cursor_name = "wait";
break;
case SDL_SYSTEM_CURSOR_CROSSHAIR:
cursor_name = "crosshair";
break;
case SDL_SYSTEM_CURSOR_WAITARROW:
cursor_name = "progress";
break;
case SDL_SYSTEM_CURSOR_SIZENWSE:
cursor_name = "nwse-resize";
break;
case SDL_SYSTEM_CURSOR_SIZENESW:
cursor_name = "nesw-resize";
break;
case SDL_SYSTEM_CURSOR_SIZEWE:
cursor_name = "ew-resize";
break;
case SDL_SYSTEM_CURSOR_SIZENS:
cursor_name = "ns-resize";
break;
case SDL_SYSTEM_CURSOR_SIZEALL:
break;
case SDL_SYSTEM_CURSOR_NO:
cursor_name = "not-allowed";
break;
case SDL_SYSTEM_CURSOR_HAND:
cursor_name = "pointer";
break;
default:
SDL_assert(0);
return NULL;
}
return Emscripten_CreateCursorFromString(cursor_name, SDL_FALSE);
}
static void
Emscripten_FreeCursor(SDL_Cursor* cursor)
{
Emscripten_CursorData *curdata;
if (cursor) {
curdata = (Emscripten_CursorData *) cursor->driverdata;
if (curdata != NULL) {
if (curdata->is_custom) {
SDL_free((char *)curdata->system_cursor);
}
SDL_free(cursor->driverdata);
}
SDL_free(cursor);
}
}
static int
Emscripten_ShowCursor(SDL_Cursor* cursor)
{
Emscripten_CursorData *curdata;
if (SDL_GetMouseFocus() != NULL) {
if(cursor && cursor->driverdata) {
curdata = (Emscripten_CursorData *) cursor->driverdata;
if(curdata->system_cursor) {
EM_ASM_INT({
if (Module['canvas']) {
Module['canvas'].style['cursor'] = Module['Pointer_stringify']($0);
}
return 0;
}, curdata->system_cursor);
}
}
else {
EM_ASM(
if (Module['canvas']) {
Module['canvas'].style['cursor'] = 'none';
}
);
}
}
return 0;
}
static void
Emscripten_WarpMouse(SDL_Window* window, int x, int y)
{
SDL_Unsupported();
}
static int
Emscripten_SetRelativeMouseMode(SDL_bool enabled)
{
/* TODO: pointer lock isn't actually enabled yet */
if(enabled) {
if(emscripten_request_pointerlock(NULL, 1) >= EMSCRIPTEN_RESULT_SUCCESS) {
return 0;
}
} else {
if(emscripten_exit_pointerlock() >= EMSCRIPTEN_RESULT_SUCCESS) {
return 0;
}
}
return -1;
}
void
Emscripten_InitMouse()
{
SDL_Mouse* mouse = SDL_GetMouse();
mouse->CreateCursor = Emscripten_CreateCursor;
mouse->ShowCursor = Emscripten_ShowCursor;
mouse->FreeCursor = Emscripten_FreeCursor;
mouse->WarpMouse = Emscripten_WarpMouse;
mouse->CreateSystemCursor = Emscripten_CreateSystemCursor;
mouse->SetRelativeMouseMode = Emscripten_SetRelativeMouseMode;
SDL_SetDefaultCursor(Emscripten_CreateDefaultCursor());
}
void
Emscripten_FiniMouse()
{
}
#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
/* vi: set ts=4 sw=4 expandtab: */
SDL_ConvertSurfaceFormat
#define SDL_ConvertSurfaceFormat
Definition: SDL_dynapi_overrides.h:464
SDL_GetMouse
SDL_Mouse * SDL_GetMouse(void)
Definition: SDL_mouse.c:112
SDL_Mouse::ShowCursor
int(* ShowCursor)(SDL_Cursor *cursor)
Definition: SDL_mouse_c.h:52
num
GLuint num
Definition: SDL_opengl_glext.h:4956
SDL_TRUE
Definition: SDL_stdinc.h:142
SDL_SYSTEM_CURSOR_ARROW
Definition: SDL_mouse.h:48
image
GLeglImageOES image
Definition: SDL_opengl.h:2148
dst
GLenum GLenum dst
Definition: SDL_opengl_glext.h:1737
SDL_Surface::h
int h
Definition: SDL_surface.h:73
SDL_SYSTEM_CURSOR_HAND
Definition: SDL_mouse.h:59
x
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1574
SDL_Mouse::SetRelativeMouseMode
int(* SetRelativeMouseMode)(SDL_bool enabled)
Definition: SDL_mouse_c.h:67
Emscripten_FiniMouse
void Emscripten_FiniMouse()
SDL_FALSE
Definition: SDL_stdinc.h:141
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
surface
EGLSurface surface
Definition: eglext.h:248
SDL_Surface
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
SDL_emscriptenmouse.h
SDL_Cursor
Definition: SDL_mouse_c.h:30
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
SDL_Surface::w
int w
Definition: SDL_surface.h:73
src
GLenum src
Definition: SDL_opengl_glext.h:1737
SDL_SYSTEM_CURSOR_SIZEALL
Definition: SDL_mouse.h:57
SDL_SYSTEM_CURSOR_SIZEWE
Definition: SDL_mouse.h:55
SDL_Mouse::CreateCursor
SDL_Cursor *(* CreateCursor)(SDL_Surface *surface, int hot_x, int hot_y)
Definition: SDL_mouse_c.h:46
val
GLuint GLfloat * val
Definition: SDL_opengl_glext.h:1492
Emscripten_CursorData
Definition: SDL_emscriptenmouse.h:28
SDL_PIXELFORMAT_ABGR8888
Definition: SDL_pixels.h:254
SDL_Surface::pixels
void * pixels
Definition: SDL_surface.h:75
SDL_SYSTEM_CURSOR_SIZENWSE
Definition: SDL_mouse.h:53
SDL_FreeSurface
#define SDL_FreeSurface
Definition: SDL_dynapi_overrides.h:446
SDL_free
#define SDL_free
Definition: SDL_dynapi_overrides.h:377
w
GLubyte GLubyte GLubyte GLubyte w
Definition: SDL_opengl_glext.h:731
SDL_SystemCursor
SDL_SystemCursor
Cursor types for SDL_CreateSystemCursor().
Definition: SDL_mouse.h:46
y
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1574
pixels
GLint GLint GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: SDL_opengl.h:1572
SDL_SetDefaultCursor
void SDL_SetDefaultCursor(SDL_Cursor *cursor)
Definition: SDL_mouse.c:101
Emscripten_CursorData::is_custom
SDL_bool is_custom
Definition: SDL_emscriptenmouse.h:31
enabled
GLenum GLenum GLsizei const GLuint GLboolean enabled
Definition: SDL_opengl_glext.h:2479
cursor
SDL_Cursor * cursor
Definition: testcustomcursor.c:119
SDL_Mouse::FreeCursor
void(* FreeCursor)(SDL_Cursor *cursor)
Definition: SDL_mouse_c.h:58
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:169
SDL_SYSTEM_CURSOR_CROSSHAIR
Definition: SDL_mouse.h:51
NULL
#define NULL
Definition: begin_code.h:164
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:139
SDL_GetMouseFocus
#define SDL_GetMouseFocus
Definition: SDL_dynapi_overrides.h:245
SDL_SYSTEM_CURSOR_WAIT
Definition: SDL_mouse.h:50
SDL_calloc
#define SDL_calloc
Definition: SDL_dynapi_overrides.h:375
window
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:73
SDL_SYSTEM_CURSOR_IBEAM
Definition: SDL_mouse.h:49
SDL_Mouse::WarpMouse
void(* WarpMouse)(SDL_Window *window, int x, int y)
Definition: SDL_mouse_c.h:61
SDL_SYSTEM_CURSOR_SIZENESW
Definition: SDL_mouse.h:54
SDL_Mouse
Definition: SDL_mouse_c.h:43
SDL_SYSTEM_CURSOR_NO
Definition: SDL_mouse.h:58
Emscripten_CursorData::system_cursor
const char * system_cursor
Definition: SDL_emscriptenmouse.h:30
SDL_SYSTEM_CURSOR_SIZENS
Definition: SDL_mouse.h:56
SDL_SYSTEM_CURSOR_WAITARROW
Definition: SDL_mouse.h:52
SDL_Mouse::CreateSystemCursor
SDL_Cursor *(* CreateSystemCursor)(SDL_SystemCursor id)
Definition: SDL_mouse_c.h:49
SDL_Cursor::driverdata
void * driverdata
Definition: SDL_mouse_c.h:33
SDL_Unsupported
#define SDL_Unsupported()
Definition: SDL_error.h:53
Emscripten_InitMouse
void Emscripten_InitMouse()
SDL_assert.h
hot_x
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
ctx
EGLContext ctx
Definition: eglext.h:208