369 lines
10 KiB
C
369 lines
10 KiB
C
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/*
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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#include <SDL3/SDL_test_common.h>
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#include <SDL3/SDL_main.h>
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/* Stolen from the mailing list */
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/* Creates a new mouse cursor from an XPM */
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/* XPM */
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static const char *arrow[] = {
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/* width height num_colors chars_per_pixel */
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" 32 32 3 1",
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/* colors */
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"X c #000000",
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". c #ffffff",
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" c None",
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/* pixels */
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"X ",
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"XX ",
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"X.X ",
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"X..X ",
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"X...X ",
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"X....X ",
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"X.....X ",
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"X......X ",
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"X.......X ",
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"X........X ",
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"X.....XXXXX ",
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"X..X..X ",
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"X.X X..X ",
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"XX X..X ",
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"X X..X ",
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" X..X ",
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" X..X ",
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" X..X ",
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" XX ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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" ",
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"0,0"
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};
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static SDLTest_CommonState *state;
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static int done;
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#define PROP_CURSOR_TEXTURE "cursor_texture"
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#define MAX_MICE 3
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#define CURSOR_SIZE 48.0f
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#define MAX_TRAIL 500
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#define TRAIL_SIZE 8.0f
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static SDL_Color colors[] = {
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{ 0, 255, 255, 255 }, /* mouse 1, cyan */
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{ 255, 0, 255, 255 }, /* mouse 2, magenta */
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{ 255, 255, 0, 255 }, /* mouse 3, yellow */
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};
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SDL_COMPILE_TIME_ASSERT(colors, SDL_arraysize(colors) == MAX_MICE);
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typedef struct
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{
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SDL_MouseID instance_id;
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SDL_bool active;
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Uint8 button_state;
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SDL_FPoint position;
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int trail_head;
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int trail_length;
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SDL_FPoint trail[MAX_TRAIL];
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} MouseState;
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static MouseState mice[MAX_MICE];
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static SDL_Texture *CreateCursor(const char *image[], SDL_Renderer *renderer)
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{
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SDL_Surface *surface;
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SDL_Palette *palette;
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SDL_Texture *texture;
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int row;
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surface = SDL_CreateSurface(32, 32, SDL_PIXELFORMAT_INDEX8);
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for (row = 0; row < surface->h; ++row) {
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SDL_memcpy((Uint8 *)surface->pixels + row * surface->pitch, image[4 + row], surface->w);
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}
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palette = SDL_CreatePalette(256);
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if (!palette) {
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SDL_DestroySurface(surface);
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return NULL;
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}
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palette->colors['.'].r = 0xFF;
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palette->colors['.'].g = 0xFF;
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palette->colors['.'].b = 0xFF;
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palette->colors['X'].r = 0x00;
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palette->colors['X'].g = 0x00;
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palette->colors['X'].b = 0x00;
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SDL_SetSurfacePalette(surface, palette);
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SDL_DestroyPalette(palette);
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SDL_SetSurfaceColorKey(surface, SDL_TRUE, ' ');
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texture = SDL_CreateTextureFromSurface(renderer, surface);
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SDL_DestroySurface(surface);
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return texture;
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}
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static void HandleMouseAdded(SDL_MouseID instance_id)
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{
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SDL_Window *window = state->windows[0];
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int i, w = 0, h = 0;
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SDL_GetWindowSize(window, &w, &h);
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for (i = 0; i < SDL_arraysize(mice); ++i) {
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MouseState *mouse_state = &mice[i];
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if (!mouse_state->active) {
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mouse_state->instance_id = instance_id;
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mouse_state->active = SDL_TRUE;
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mouse_state->position.x = w * 0.5f;
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mouse_state->position.y = h * 0.5f;
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return;
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}
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}
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}
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static void HandleMouseRemoved(SDL_MouseID instance_id)
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{
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int i;
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for (i = 0; i < SDL_arraysize(mice); ++i) {
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MouseState *mouse_state = &mice[i];
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if (instance_id == mouse_state->instance_id) {
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SDL_zerop(mouse_state);
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return;
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}
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}
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}
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static void ActivateMouse(SDL_MouseID instance_id)
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{
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int i;
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for (i = 0; i < SDL_arraysize(mice); ++i) {
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MouseState *mouse_state = &mice[i];
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if (mouse_state->active && instance_id == mouse_state->instance_id) {
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return;
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}
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}
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HandleMouseAdded(instance_id);
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}
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static void HandleMouseMotion(SDL_MouseMotionEvent *event)
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{
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SDL_Window *window = state->windows[0];
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int i, w = 0, h = 0;
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if (event->which == 0) {
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/* The system pointer, not a distinct mouse device */
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return;
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}
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ActivateMouse(event->which);
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SDL_GetWindowSize(window, &w, &h);
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for (i = 0; i < SDL_arraysize(mice); ++i) {
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MouseState *mouse_state = &mice[i];
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if (!mouse_state->active) {
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continue;
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}
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if (event->which == mouse_state->instance_id) {
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float x = (mouse_state->position.x + event->xrel);
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float y = (mouse_state->position.y + event->yrel);
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x = SDL_clamp(x, 0.0f, (float)w);
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y = SDL_clamp(y, 0.0f, (float)h);
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mouse_state->position.x = x;
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mouse_state->position.y = y;
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if (mouse_state->button_state) {
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/* Add a spot to the mouse trail */
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SDL_FPoint *spot = &mouse_state->trail[mouse_state->trail_head];
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spot->x = x - TRAIL_SIZE * 0.5f;
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spot->y = y - TRAIL_SIZE * 0.5f;
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if (mouse_state->trail_length < MAX_TRAIL) {
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++mouse_state->trail_length;
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}
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mouse_state->trail_head = (mouse_state->trail_head + 1) % MAX_TRAIL;
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}
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}
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}
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}
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static void HandleMouseButton(SDL_MouseButtonEvent *event)
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{
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int i;
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if (event->which == 0) {
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/* The system pointer, not a distinct mouse device */
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return;
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}
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ActivateMouse(event->which);
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for (i = 0; i < SDL_arraysize(mice); ++i) {
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MouseState *mouse_state = &mice[i];
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if (!mouse_state->active) {
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continue;
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}
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if (event->which == mouse_state->instance_id) {
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if (event->state) {
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mouse_state->button_state |= SDL_BUTTON(event->button);
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} else {
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mouse_state->button_state &= ~SDL_BUTTON(event->button);
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}
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}
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}
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}
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static void DrawMouseState(SDL_Window *window, SDL_Renderer *renderer, MouseState *mouse_state, SDL_Texture *cursor, SDL_Color *color)
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{
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SDL_FRect rect;
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if (!mouse_state->active) {
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return;
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}
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if (mouse_state->trail_length > 0) {
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int i;
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int spot = mouse_state->trail_head - mouse_state->trail_length;
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if (spot < 0) {
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spot += MAX_TRAIL;
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}
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rect.w = TRAIL_SIZE;
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rect.h = TRAIL_SIZE;
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SDL_SetRenderDrawColor(renderer, color->r, color->g, color->b, color->a);
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for (i = 0; i < mouse_state->trail_length; ++i) {
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rect.x = mouse_state->trail[spot].x;
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rect.y = mouse_state->trail[spot].y;
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SDL_RenderFillRect(renderer, &rect);
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spot = (spot + 1) % MAX_TRAIL;
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}
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}
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rect.x = mouse_state->position.x;
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rect.y = mouse_state->position.y;
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rect.w = CURSOR_SIZE;
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rect.h = CURSOR_SIZE;
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SDL_SetTextureColorMod(cursor, color->r, color->g, color->b);
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SDL_RenderTexture(renderer, cursor, NULL, &rect);
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}
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static void loop(void)
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{
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int i, j;
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SDL_Event event;
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/* Check for events */
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while (SDL_PollEvent(&event)) {
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SDLTest_CommonEvent(state, &event, &done);
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switch (event.type) {
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case SDL_EVENT_MOUSE_ADDED:
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/* Wait for events before activating this mouse */
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break;
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case SDL_EVENT_MOUSE_REMOVED:
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HandleMouseRemoved(event.mdevice.which);
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break;
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case SDL_EVENT_MOUSE_MOTION:
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HandleMouseMotion(&event.motion);
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break;
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case SDL_EVENT_MOUSE_BUTTON_DOWN:
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case SDL_EVENT_MOUSE_BUTTON_UP:
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HandleMouseButton(&event.button);
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break;
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default:
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break;
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}
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}
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for (i = 0; i < state->num_windows; ++i) {
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SDL_Window *window = state->windows[i];
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SDL_Renderer *renderer = state->renderers[i];
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SDL_Texture *cursor = (SDL_Texture *)SDL_GetProperty(SDL_GetRendererProperties(renderer), PROP_CURSOR_TEXTURE, NULL);
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SDL_SetRenderDrawColor(renderer, 128, 128, 128, 255);
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SDL_RenderClear(renderer);
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for (j = 0; j < SDL_arraysize(mice); ++j) {
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DrawMouseState(window, renderer, &mice[j], cursor, &colors[j]);
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}
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SDL_RenderPresent(renderer);
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}
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}
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int main(int argc, char *argv[])
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{
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int i;
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* Log all events, including mouse motion */
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SDL_SetHint(SDL_HINT_EVENT_LOGGING, "2");
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/* Initialize test framework */
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state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
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if (!state) {
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return 1;
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}
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for (i = 1; i < argc;) {
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int consumed;
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consumed = SDLTest_CommonArg(state, i);
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if (consumed < 0) {
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SDLTest_CommonLogUsage(state, argv[0], NULL);
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SDLTest_CommonQuit(state);
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return 1;
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}
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}
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if (!SDLTest_CommonInit(state)) {
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SDLTest_CommonQuit(state);
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return 2;
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}
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/* Create the cursor textures */
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for (i = 0; i < state->num_windows; ++i) {
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SDL_Renderer *renderer = state->renderers[i];
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SDL_Texture *cursor = CreateCursor(arrow, renderer);
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SDL_SetProperty(SDL_GetRendererProperties(renderer), PROP_CURSOR_TEXTURE, cursor);
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}
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/* We only get mouse motion for distinct devices when relative mode is enabled */
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SDL_SetRelativeMouseMode(SDL_TRUE);
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/* Main render loop */
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done = 0;
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while (!done) {
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loop();
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}
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SDLTest_CommonQuit(state);
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return 0;
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}
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