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Handle global mouse state for Emscripten (#12669)

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Temdog007 2025-04-02 07:21:21 -07:00 • committed by GitHub
parent 53d053279e
commit cc8ec6cf18
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2 changed files with 66 additions and 0 deletions
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60
src/video/emscripten/SDL_emscriptenmouse.c
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@ -196,6 +196,26 @@ static bool Emscripten_SetRelativeMouseMode(bool enabled)
return false;
}
static SDL_MouseButtonFlags Emscripten_GetGlobalMouseState(float *x, float *y)
{
*x = MAIN_THREAD_EM_ASM_DOUBLE({
return Module['SDL3']['mouse_x'];
});
*y = MAIN_THREAD_EM_ASM_DOUBLE({
return Module['SDL3']['mouse_y'];
});
SDL_MouseButtonFlags flags = 0;
for (int i = 0; i < 5; ++i) {
const bool button_down = MAIN_THREAD_EM_ASM_INT({
return Module['SDL3']['mouse_buttons'][$0];
}, i);
if (button_down) {
flags |= 1 << i;
}
}
return flags;
}
void Emscripten_InitMouse(void)
{
SDL_Mouse *mouse = SDL_GetMouse();
@ -206,6 +226,46 @@ void Emscripten_InitMouse(void)
mouse->CreateSystemCursor = Emscripten_CreateSystemCursor;
mouse->SetRelativeMouseMode = Emscripten_SetRelativeMouseMode;
// Add event listeners to track mouse events on the document
MAIN_THREAD_EM_ASM({
if (!Module['SDL3']) {
Module['SDL3'] = {};
}
var SDL3 = Module['SDL3'];
SDL3['mouse_x'] = 0;
SDL3['mouse_y'] = 0;
/*
Based on https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/button
Possible value for button in the event object is [0, 5)
NOTE: Some browsers do not allow handling the forwards and backwards buttons
*/
SDL3['mouse_buttons'] = [];
for (var i = 0; i < 5; ++i) {
SDL3['mouse_buttons'][i] = false;
}
document.addEventListener('mousemove', function(e) {
// Reacquire from object in case it changed for some reason
var SDL3 = Module['SDL3'];
SDL3['mouse_x'] = e.clientX;
SDL3['mouse_y'] = e.clientY;
});
document.addEventListener('mousedown', function(e) {
// Reacquire from object in case it changed for some reason
var SDL3 = Module['SDL3'];
if (0 <= e.button && e.button < SDL3['mouse_buttons'].length) {
SDL3['mouse_buttons'][e.button] = true;
}
});
document.addEventListener('mouseup', function(e) {
// Reacquire from object in case it changed for some reason
var SDL3 = Module['SDL3'];
if (0 <= e.button && e.button < SDL3['mouse_buttons'].length) {
SDL3['mouse_buttons'][e.button] = false;
}
});
});
mouse->GetGlobalMouseState = Emscripten_GetGlobalMouseState;
SDL_SetDefaultCursor(Emscripten_CreateDefaultCursor());
}

6
test/testmouse.c
View file

@ -117,6 +117,8 @@ static void loop(void *arg)
struct mouse_loop_data *loop_data = (struct mouse_loop_data *)arg;
SDL_Event event;
SDL_Renderer *renderer = loop_data->renderer;
float fx, fy;
SDL_MouseButtonFlags flags;
/* Check for events */
while (SDL_PollEvent(&event)) {
@ -265,6 +267,10 @@ static void loop(void *arg)
DrawObject(renderer, active);
}
flags = SDL_GetGlobalMouseState(&fx, &fy);
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
SDL_RenderDebugTextFormat(renderer, 0, 0, "Global Mouse State: x=%f y=%f flags=%" SDL_PRIu32, fx, fy, flags);
SDL_RenderPresent(renderer);
#ifdef SDL_PLATFORM_EMSCRIPTEN