universe@0: /*
universe@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@0:  * Copyright 2023 Mike Becker. All rights reserved.
universe@0:  *
universe@0:  * Redistribution and use in source and binary forms, with or without
universe@0:  * modification, are permitted provided that the following conditions are met:
universe@0:  *
universe@0:  *   1. Redistributions of source code must retain the above copyright
universe@0:  *      notice, this list of conditions and the following disclaimer.
universe@0:  *
universe@0:  *   2. Redistributions in binary form must reproduce the above copyright
universe@0:  *      notice, this list of conditions and the following disclaimer in the
universe@0:  *      documentation and/or other materials provided with the distribution.
universe@0:  *
universe@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@0:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@0:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@0:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@0:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@0:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@0:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@0:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@0:  * POSSIBILITY OF SUCH DAMAGE.
universe@0:  */
universe@0: 
universe@6: #include "ascension/window.h"
universe@7: #include "ascension/context.h"
universe@7: #include "ascension/error.h"
universe@9: #include "ascension/utils.h"
universe@0: 
universe@6: #include <GL/glew.h>
universe@6: 
universe@0: void asc_window_settings_init_defaults(AscWindowSettings* settings) {
universe@3:     settings->dimensions.width = 800;
universe@3:     settings->dimensions.height = 600;
universe@0:     settings->fullscreen = 0;
universe@44:     settings->glsettings.depth_size = 24;
universe@44:     settings->glsettings.vsync = 1;
universe@44:     settings->glsettings.gl_major_version = 4;
universe@44:     settings->glsettings.gl_minor_version = 0;
universe@0:     settings->title = "Ascended Window";
universe@0: }
universe@0: 
universe@7: AscWindow *asc_window_initialize(unsigned int index, AscWindowSettings const *settings) {
universe@7:     if (index >= ASC_MAX_WINDOWS) {
universe@7:         asc_error("Maximum number of windows exceeded.");
universe@7:         return NULL;
universe@7:     }
universe@7:     AscWindow *window = &asc_context.windows[index];
universe@7:     if (window->id > 0) {
universe@7:         asc_error("Cannot create window - slot already occupied.");
universe@47:         asc_dprintf("Tried to create window with index %u twice", index);
universe@7:         return NULL;
universe@7:     }
universe@47:     if (window->ui != NULL) {
universe@47:         asc_dprintf("Window with index %u has a dangling UI pointer", index);
universe@47:         asc_scene_node_free(window->ui);
universe@47:     }
universe@7: 
universe@0:     Uint32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;
universe@0:     flags |= settings->fullscreen ? SDL_WINDOW_FULLSCREEN_DESKTOP : SDL_WINDOW_RESIZABLE;
universe@0: 
universe@0:     window->window = SDL_CreateWindow(
universe@0:             settings->title,
universe@0:             SDL_WINDOWPOS_CENTERED,
universe@0:             SDL_WINDOWPOS_CENTERED,
universe@3:             settings->dimensions.width,
universe@3:             settings->dimensions.height,
universe@0:             flags
universe@0:     );
universe@0:     if (window->window == NULL) {
universe@0:         asc_error(SDL_GetError());
universe@7:         return NULL;
universe@0:     }
universe@0: 
universe@0:     window->id = SDL_GetWindowID(window->window);
universe@3:     SDL_GetWindowSize(window->window,
universe@3:             &window->dimensions.width,
universe@3:             &window->dimensions.height
universe@3:     );
universe@37:     window->resized = true; // count initial sizing as resize
universe@0: 
universe@44:     if (asc_gl_context_initialize(&window->glctx, window->window, &settings->glsettings)) {
universe@47:         window->ui = asc_scene_node_empty();
universe@44:         asc_dprintf("Window %u initialized", window->id);
universe@44:         asc_context.active_window = window;
universe@44:         return window;
universe@44:     } else {
universe@0:         asc_dprintf("Creating GL context failed for window %u", window->id);
universe@44:         // cleanup on error
universe@44:         SDL_DestroyWindow(window->window);
universe@44:         window->window = NULL;
universe@44:         window->id = 0;
universe@44:         return NULL;
universe@0:     }
universe@0: }
universe@0: 
universe@7: void asc_window_destroy(AscWindow* window) {
universe@7:     // safeguard
universe@7:     if (window->id == 0) return;
universe@7: 
universe@16:     // this window cannot be active anymore
universe@16:     if (asc_context.active_window == window) {
universe@16:         asc_context.active_window = NULL;
universe@16:     }
universe@16: 
universe@29:     // destroy all scenes
universe@47:     asc_scene_node_free(window->ui);
universe@47:     window->ui = NULL;
universe@29: 
universe@44:     // release context related data
universe@44:     asc_gl_context_destroy(&window->glctx);
universe@16: 
universe@44:     // destroy window
universe@0:     if (window->window != NULL) {
universe@0:         SDL_DestroyWindow(window->window);
universe@0:     }
universe@0: 
universe@16:     // if another window was active, make the other context current again
universe@16:     if (asc_context.active_window != NULL) {
universe@44:         asc_gl_context_activate(&asc_context.active_window->glctx);
universe@16:     }
universe@16: 
universe@0:     // clean the data
universe@0:     asc_dprintf("Window %u and its OpenGL context destroyed.", window->id);
universe@0:     memset(window, 0, sizeof(AscWindow));
universe@0: }
universe@0: 
universe@37: void asc_window_sync(AscWindow* window) {
universe@44:     AscWindow *active_window = asc_context.active_window;
universe@16:     if (window != active_window) {
universe@16:         asc_window_activate(window);
universe@16:     }
universe@29: 
universe@47:     // Clear the color buffer for the window frame
universe@47:     int window_width = window->dimensions.width;
universe@47:     int window_height = window->dimensions.height;
universe@47:     glViewport(0, 0, window_width, window_height);
universe@47:     glClear(GL_COLOR_BUFFER_BIT);
universe@47:     asc_recti viewport = {0, 0, window_width, window_height};
universe@47: 
universe@29:     // Draw the UI
universe@47:     AscCamera ui_camera;
universe@47:     asc_camera_ortho(&ui_camera, viewport);
universe@47:     asc_scene_draw(window->ui, viewport, &ui_camera);
universe@29: 
universe@29:     // Swap Buffers
universe@29:     SDL_GL_SwapWindow(window->window);
universe@29: 
universe@37:     // Clear Flags
universe@37:     window->resized = false;
universe@37: 
universe@16:     if (window != active_window) {
universe@16:         asc_window_activate(active_window);
universe@16:     }
universe@0: }
universe@16: 
universe@44: void asc_window_activate(AscWindow *window) {
universe@44:     asc_gl_context_activate(&window->glctx);
universe@34:     asc_context.active_window = (AscWindow *)window;
universe@16: }