Thu, 18 Jan 2024 21:58:58 +0100
allow NULL argument für asc_text()
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 * Copyright 2023 Mike Becker. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
28 #include "ascension/window.h"
29 #include "ascension/context.h"
30 #include "ascension/error.h"
31 #include "ascension/utils.h"
33 #include <cx/printf.h>
35 #include <GL/glew.h>
37 static void asc_gl_debug_callback(
38 GLenum source, GLenum type, GLuint id, GLenum severity,
39 GLsizei length, const GLchar* message,
40 const void* userParam
41 ) {
42 cxmutstr buf = cx_asprintf(
43 "source = %d, id = %u, type = %d, severity= %d, message = %.*s",
44 source, id, type, severity, length, message);
45 if (type == GL_DEBUG_TYPE_ERROR) {
46 asc_error(buf.ptr);
47 } else {
48 asc_dprintf("GL debug: %.*s", (int)buf.length, buf.ptr);
49 }
50 cx_strfree(&buf);
51 }
53 void asc_window_settings_init_defaults(AscWindowSettings* settings) {
54 settings->depth_size = 24;
55 settings->vsync = 1;
56 settings->dimensions.width = 800;
57 settings->dimensions.height = 600;
58 settings->fullscreen = 0;
59 settings->gl_major_version = 4;
60 settings->gl_minor_version = 0;
61 settings->title = "Ascended Window";
62 }
64 AscWindow *asc_window_initialize(unsigned int index, AscWindowSettings const *settings) {
65 if (index >= ASC_MAX_WINDOWS) {
66 asc_error("Maximum number of windows exceeded.");
67 return NULL;
68 }
69 AscWindow *window = &asc_context.windows[index];
70 if (window->id > 0) {
71 asc_error("Cannot create window - slot already occupied.");
72 asc_dprintf("Tried to create window with index %u", index);
73 return NULL;
74 }
76 Uint32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;
77 flags |= settings->fullscreen ? SDL_WINDOW_FULLSCREEN_DESKTOP : SDL_WINDOW_RESIZABLE;
79 window->window = SDL_CreateWindow(
80 settings->title,
81 SDL_WINDOWPOS_CENTERED,
82 SDL_WINDOWPOS_CENTERED,
83 settings->dimensions.width,
84 settings->dimensions.height,
85 flags
86 );
87 if (window->window == NULL) {
88 asc_error(SDL_GetError());
89 return NULL;
90 }
92 window->id = SDL_GetWindowID(window->window);
93 SDL_GetWindowSize(window->window,
94 &window->dimensions.width,
95 &window->dimensions.height
96 );
97 asc_mat4f_ortho(
98 window->projection,
99 0,
100 (float) window->dimensions.width,
101 (float) window->dimensions.height,
102 0
103 );
105 SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
106 SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, settings->gl_major_version);
107 SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, settings->gl_minor_version);
108 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, settings->depth_size);
109 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
110 window->glctx = SDL_GL_CreateContext(window->window);
111 if (window->glctx == NULL) {
112 asc_dprintf("Creating GL context failed for window %u", window->id);
113 } else {
114 glewExperimental = GL_TRUE;
115 GLenum err = glewInit();
116 if (err == GLEW_OK) {
117 SDL_GL_SetSwapInterval(settings->vsync);
118 glEnable(GL_DEPTH_TEST);
119 glEnable(GL_BLEND);
120 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
121 glEnable(GL_DEBUG_OUTPUT);
122 glDebugMessageCallback(asc_gl_debug_callback, NULL);
124 asc_dprintf("Window %u initialized", window->id);
125 if (asc_primitives_init(&window->primitives)) {
126 asc_context.active_window = window;
127 return window;
128 } else {
129 asc_dprintf("!!! Creating primitives for window %u failed !!!", window->id);
130 }
131 } else {
132 asc_error(glewGetErrorString(err));
133 }
134 }
136 // cleanup on error
137 if (window->glctx != NULL) {
138 SDL_GL_DeleteContext(window->glctx);
139 }
140 window->glctx = NULL;
141 SDL_DestroyWindow(window->window);
142 window->window = NULL;
143 window->id = 0;
144 }
146 void asc_window_destroy(AscWindow* window) {
147 // safeguard
148 if (window->id == 0) return;
150 // this window cannot be active anymore
151 if (asc_context.active_window == window) {
152 asc_context.active_window = NULL;
153 }
155 // release context related data (we have to make the GL context current for this)
156 SDL_GL_MakeCurrent(window->window, window->glctx);
157 asc_primitives_destroy(&window->primitives);
159 // destroy the GL context and the window
160 if (window->glctx != NULL) {
161 SDL_GL_DeleteContext(window->glctx);
162 }
163 if (window->window != NULL) {
164 SDL_DestroyWindow(window->window);
165 }
167 // if another window was active, make the other context current again
168 if (asc_context.active_window != NULL) {
169 AscWindow const *aw = asc_context.active_window;
170 SDL_GL_MakeCurrent(aw->window, aw->glctx);
171 }
173 // clean the data
174 asc_dprintf("Window %u and its OpenGL context destroyed.", window->id);
175 memset(window, 0, sizeof(AscWindow));
176 }
178 void asc_window_sync(AscWindow const* window) {
179 AscWindow const *active_window = asc_context.active_window;
180 if (window != active_window) {
181 asc_window_activate(window);
182 }
183 SDL_GL_SwapWindow(window->window);
184 glViewport(0, 0, window->dimensions.width, window->dimensions.height);
185 glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
186 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
187 if (window != active_window) {
188 asc_window_activate(active_window);
189 }
190 }
192 void asc_window_activate(AscWindow const *window) {
193 SDL_GL_MakeCurrent(window->window, window->glctx);
194 asc_context.active_window = window;
195 }