Mercurial > hg > ascension / file revision

 /*

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  * Copyright 2023 Mike Becker. All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   1. Redistributions of source code must retain the above copyright

  *      notice, this list of conditions and the following disclaimer.

  *

  *   2. Redistributions in binary form must reproduce the above copyright

  *      notice, this list of conditions and the following disclaimer in the

  *      documentation and/or other materials provided with the distribution.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 #include "ascension/window.h"

 #include "ascension/context.h"

 #include "ascension/error.h"

 #include "ascension/utils.h"

 #include <GL/glew.h>

 void asc_window_settings_init_defaults(AscWindowSettings* settings) {

     settings->dimensions.width = 800;

     settings->dimensions.height = 600;

     settings->fullscreen = 0;

     settings->glsettings.depth_size = 24;

     settings->glsettings.vsync = 1;

     settings->glsettings.gl_major_version = 4;

     settings->glsettings.gl_minor_version = 0;

     settings->title = "Ascended Window";

 }

 AscWindow *asc_window_initialize(unsigned int index, AscWindowSettings const *settings) {

     if (index >= ASC_MAX_WINDOWS) {

         asc_error("Maximum number of windows exceeded.");

         return NULL;

     }

     AscWindow *window = &asc_context.windows[index];

     if (window->id > 0) {

         asc_error("Cannot create window - slot already occupied.");

         asc_dprintf("Tried to create window with index %u twice", index);

         return NULL;

     }

     if (window->ui != NULL) {

         asc_dprintf("Window with index %u has a dangling UI pointer", index);

         asc_scene_node_free(window->ui);

     }

     Uint32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;

     flags |= settings->fullscreen ? SDL_WINDOW_FULLSCREEN_DESKTOP : SDL_WINDOW_RESIZABLE;

     window->window = SDL_CreateWindow(

             settings->title,

             SDL_WINDOWPOS_CENTERED,

             SDL_WINDOWPOS_CENTERED,

             settings->dimensions.width,

             settings->dimensions.height,

             flags

     );

     if (window->window == NULL) {

         asc_error(SDL_GetError());

         return NULL;

     }

     window->id = SDL_GetWindowID(window->window);

     SDL_GetWindowSize(window->window,

             &window->dimensions.width,

             &window->dimensions.height

     );

     window->resized = true; // count initial sizing as resize

     if (asc_gl_context_initialize(&window->glctx, window->window, &settings->glsettings)) {

         window->ui = asc_scene_node_empty();

         asc_dprintf("Window %u initialized", window->id);

         asc_window_active = window;

         return window;

     } else {

         asc_dprintf("Creating GL context failed for window %u", window->id);

         // cleanup on error

         SDL_DestroyWindow(window->window);

         window->window = NULL;

         window->id = 0;

         return NULL;

     }

 }

 void asc_window_destroy(AscWindow* window) {

     // safeguard

     if (window->id == 0) return;

     // this window cannot be active anymore

     if (asc_window_active == window) {

         asc_window_active = NULL;

     }

     // destroy all scenes

     asc_scene_node_free(window->ui);

     window->ui = NULL;

     // release context related data

     asc_gl_context_destroy(&window->glctx);

     // destroy window

     if (window->window != NULL) {

         SDL_DestroyWindow(window->window);

     }

     // if another window was active, make the other context current again

     if (asc_window_active != NULL) {

         asc_gl_context_activate(&asc_window_active->glctx);

     }

     // clean the data

     asc_dprintf("Window %u and its OpenGL context destroyed.", window->id);

     memset(window, 0, sizeof(AscWindow));

 }

 void asc_window_sync(AscWindow* window) {

     AscWindow *active_window = asc_window_active;

     if (window != active_window) {

         asc_window_activate(window);

     }

     // Clear the color buffer for the window frame

     int window_width = window->dimensions.width;

     int window_height = window->dimensions.height;

     glViewport(0, 0, window_width, window_height);

     glClear(GL_COLOR_BUFFER_BIT);

     asc_recti viewport = {0, 0, window_width, window_height};

     // Draw the UI

     AscCamera ui_camera;

     asc_camera_ortho(&ui_camera, viewport);

     asc_scene_draw(window->ui, viewport, &ui_camera);

     // Swap Buffers

     SDL_GL_SwapWindow(window->window);

     // Clear Flags

     window->resized = false;

     if (window != active_window) {

         asc_window_activate(active_window);

     }

 }

 void asc_window_activate(AscWindow *window) {

     asc_gl_context_activate(&window->glctx);

     asc_window_active = (AscWindow *)window;

 }