SDL2/test/testwm.c

/*
  Copyright (C) 1997-2023 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.
*/

#include <stdlib.h>

#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif

#include <SDL3/SDL_test_common.h>
#include <SDL3/SDL_test_font.h>
#include <SDL3/SDL_main.h>

static SDLTest_CommonState *state;
int done;

static const char *cursorNames[] = {
    "arrow",
    "ibeam",
    "wait",
    "crosshair",
    "waitarrow",
    "sizeNWSE",
    "sizeNESW",
    "sizeWE",
    "sizeNS",
    "sizeALL",
    "NO",
    "hand",
};
int system_cursor = -1;
SDL_Cursor *cursor = NULL;
SDL_bool relative_mode = SDL_FALSE;
int highlighted_mode = -1;

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
    SDLTest_CommonQuit(state);
    exit(rc);
}

/* Draws the modes menu, and stores the mode index under the mouse in highlighted_mode */
static void
draw_modes_menu(SDL_Window *window, SDL_Renderer *renderer, SDL_FRect viewport)
{
    const SDL_DisplayMode **modes;
    char text[1024];
    const int lineHeight = 10;
    const SDL_DisplayID displayID = SDL_GetDisplayForWindow(window);
    int i;
    int column_chars = 0;
    int text_length;
    float x, y;
    float table_top;
    SDL_FPoint mouse_pos = { -1.0f, -1.0f };

    /* Get mouse position */
    if (SDL_GetMouseFocus() == window) {
        float window_x, window_y;
        float logical_x, logical_y;

        SDL_GetMouseState(&window_x, &window_y);
        SDL_RenderCoordinatesFromWindow(renderer, window_x, window_y, &logical_x, &logical_y);

        mouse_pos.x = logical_x;
        mouse_pos.y = logical_y;
    }

    x = 0.0f;
    y = viewport.y;

    y += lineHeight;

    SDL_strlcpy(text, "Click on a mode to set it with SDL_SetWindowFullscreenMode", sizeof text);
    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
    SDLTest_DrawString(renderer, x, y, text);
    y += lineHeight;

    SDL_strlcpy(text, "Press Ctrl+Enter to toggle SDL_WINDOW_FULLSCREEN", sizeof text);
    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
    SDLTest_DrawString(renderer, x, y, text);
    y += lineHeight;

    table_top = y;

    /* Clear the cached mode under the mouse */
    if (window == SDL_GetMouseFocus()) {
        highlighted_mode = -1;
    }

    modes = SDL_GetFullscreenDisplayModes(displayID, NULL);
    for (i = 0; modes[i]; ++i) {
        SDL_FRect cell_rect;
        const SDL_DisplayMode *mode = modes[i];

        (void)SDL_snprintf(text, sizeof text, "%d: %dx%d@%gHz",
                           i, mode->pixel_w, mode->pixel_h, mode->refresh_rate);

        /* Update column width */
        text_length = (int)SDL_strlen(text);
        column_chars = SDL_max(column_chars, text_length);

        /* Check if under mouse */
        cell_rect.x = x;
        cell_rect.y = y;
        cell_rect.w = (float)(text_length * FONT_CHARACTER_SIZE);
        cell_rect.h = (float)lineHeight;

        if (SDL_PointInRectFloat(&mouse_pos, &cell_rect)) {
            SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);

            /* Update cached mode under the mouse */
            if (window == SDL_GetMouseFocus()) {
                highlighted_mode = i;
            }
        } else {
            SDL_SetRenderDrawColor(renderer, 170, 170, 170, 255);
        }

        SDLTest_DrawString(renderer, x, y, text);
        y += lineHeight;

        if ((y + lineHeight) > (viewport.y + viewport.h)) {
            /* Advance to next column */
            x += (column_chars + 1) * FONT_CHARACTER_SIZE;
            y = table_top;
            column_chars = 0;
        }
    }
    SDL_free((void *)modes);
}

void loop()
{
    int i;
    SDL_Event event;
    /* Check for events */
    while (SDL_PollEvent(&event)) {
        SDLTest_CommonEvent(state, &event, &done);

        if (event.type == SDL_EVENT_WINDOW_RESIZED) {
            SDL_Window *window = SDL_GetWindowFromID(event.window.windowID);
            if (window) {
                SDL_Log("Window %" SDL_PRIu32 " resized to %" SDL_PRIs32 "x%" SDL_PRIs32 "\n",
                        event.window.windowID,
                        event.window.data1,
                        event.window.data2);
            }
        }
        if (event.type == SDL_EVENT_WINDOW_MOVED) {
            SDL_Window *window = SDL_GetWindowFromID(event.window.windowID);
            if (window) {
                SDL_Log("Window %" SDL_PRIu32 " moved to %" SDL_PRIs32 ",%" SDL_PRIs32 " (display %s)\n",
                        event.window.windowID,
                        event.window.data1,
                        event.window.data2,
                        SDL_GetDisplayName(SDL_GetDisplayForWindow(window)));
            }
        }
        if (event.type == SDL_EVENT_WINDOW_FOCUS_LOST) {
            relative_mode = SDL_GetRelativeMouseMode();
            if (relative_mode) {
                SDL_SetRelativeMouseMode(SDL_FALSE);
            }
        }
        if (event.type == SDL_EVENT_WINDOW_FOCUS_GAINED) {
            if (relative_mode) {
                SDL_SetRelativeMouseMode(SDL_TRUE);
            }
        }
        if (event.type == SDL_EVENT_KEY_UP) {
            SDL_bool updateCursor = SDL_FALSE;

            if (event.key.keysym.sym == SDLK_a) {
                SDL_assert(!"Keyboard generated assert");
            } else if (event.key.keysym.sym == SDLK_LEFT) {
                --system_cursor;
                if (system_cursor < 0) {
                    system_cursor = SDL_NUM_SYSTEM_CURSORS - 1;
                }
                updateCursor = SDL_TRUE;
            } else if (event.key.keysym.sym == SDLK_RIGHT) {
                ++system_cursor;
                if (system_cursor >= SDL_NUM_SYSTEM_CURSORS) {
                    system_cursor = 0;
                }
                updateCursor = SDL_TRUE;
            }
            if (updateCursor) {
                SDL_Log("Changing cursor to \"%s\"", cursorNames[system_cursor]);
                SDL_DestroyCursor(cursor);
                cursor = SDL_CreateSystemCursor((SDL_SystemCursor)system_cursor);
                SDL_SetCursor(cursor);
            }
        }
        if (event.type == SDL_EVENT_MOUSE_BUTTON_UP) {
            SDL_Window *window = SDL_GetMouseFocus();
            if (highlighted_mode != -1 && window != NULL) {
                SDL_DisplayID displayID = SDL_GetDisplayForWindow(window);
                int num_modes;
                const SDL_DisplayMode **modes = SDL_GetFullscreenDisplayModes(displayID, &num_modes);
                if (highlighted_mode < num_modes) {
                    SDL_memcpy(&state->fullscreen_mode, modes[highlighted_mode], sizeof(state->fullscreen_mode));
                    SDL_SetWindowFullscreenMode(window, modes[highlighted_mode]);
                }
                SDL_free((void *)modes);
            }
        }
    }

    for (i = 0; i < state->num_windows; ++i) {
        SDL_Window *window = state->windows[i];
        SDL_Renderer *renderer = state->renderers[i];
        if (window != NULL && renderer != NULL) {
            float y = 0.0f;
            SDL_Rect viewport;
            SDL_FRect menurect;

            SDL_GetRenderViewport(renderer, &viewport);

            SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
            SDL_RenderClear(renderer);

            SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
            SDLTest_CommonDrawWindowInfo(renderer, state->windows[i], &y);

            menurect.x = 0.0f;
            menurect.y = y;
            menurect.w = (float)viewport.w;
            menurect.h = (float)viewport.h - y;
            draw_modes_menu(window, renderer, menurect);

            SDL_Delay(16);
            SDL_RenderPresent(renderer);
        }
    }
#ifdef __EMSCRIPTEN__
    if (done) {
        emscripten_cancel_main_loop();
    }
#endif
}

int main(int argc, char *argv[])
{
    int i;

    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    SDL_assert(SDL_arraysize(cursorNames) == SDL_NUM_SYSTEM_CURSORS);

    /* Initialize test framework */
    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
    if (state == NULL) {
        return 1;
    }

    if (!SDLTest_CommonDefaultArgs(state, argc, argv) || !SDLTest_CommonInit(state)) {
        SDLTest_CommonQuit(state);
        return 1;
    }

    SDL_SetEventEnabled(SDL_EVENT_DROP_FILE, SDL_TRUE);
    SDL_SetEventEnabled(SDL_EVENT_DROP_TEXT, SDL_TRUE);

    for (i = 0; i < state->num_windows; ++i) {
        SDL_Renderer *renderer = state->renderers[i];
        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
        SDL_RenderClear(renderer);
    }

    /* Main render loop */
    done = 0;
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (!done) {
        loop();
    }
#endif
    SDL_DestroyCursor(cursor);

    quit(0);
    /* keep the compiler happy ... */
    return 0;
}