ascension: src/window.c@f18dc427f86f (annotated)

src/window.c@f18dc427f86f (annotated)

src/window.c

Thu, 18 Apr 2024 21:53:53 +0200

author: Mike Becker <universe@uap-core.de>
date: Thu, 18 Apr 2024 21:53:53 +0200
changeset 64: f18dc427f86f
parent 47: 44457f6cb0a2
child 65: 9c44c55d327a
permissions: -rw-r--r--

make use of the asc_window_active macro

 /*
  * 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;
 }

Mercurial > hg > ascension / annotate

src/window.c@f18dc427f86f (annotated)

src/window.c