ascension: src/window.c@25013a35e07d (annotated)

src/window.c@25013a35e07d (annotated)

src/window.c

Sun, 19 Nov 2023 13:22:43 +0100

author: Mike Becker <universe@uap-core.de>
date: Sun, 19 Nov 2023 13:22:43 +0100
changeset 17: 25013a35e07d
parent 16: c5dde81b6fb2
child 29: 1d001eb694dc
permissions: -rw-r--r--

fix text rendering for alpha==0

 /*
  * 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 <cx/printf.h>
 #include <GL/glew.h>
 static void asc_gl_debug_callback(
         GLenum source, GLenum type, GLuint id, GLenum severity,
         GLsizei length, const GLchar* message,
         const void* userParam
 ) {
     cxmutstr buf = cx_asprintf(
             "source = %d, id = %u, type = %d, severity= %d, message = %.*s",
             source, id, type, severity, length, message);
     if (type == GL_DEBUG_TYPE_ERROR) {
         asc_error(buf.ptr);
     } else {
         asc_dprintf("GL debug: %.*s", (int)buf.length, buf.ptr);
     }
     cx_strfree(&buf);
 }
 void asc_window_settings_init_defaults(AscWindowSettings* settings) {
     settings->depth_size = 24;
     settings->vsync = 1;
     settings->dimensions.width = 800;
     settings->dimensions.height = 600;
     settings->fullscreen = 0;
     settings->gl_major_version = 4;
     settings->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", index);
         return NULL;
     }
     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
     );
     asc_mat4f_ortho(
             window->projection,
 ,
             (float) window->dimensions.width,
             (float) window->dimensions.height,
 
     );
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, settings->gl_major_version);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, settings->gl_minor_version);
     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, settings->depth_size);
     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
     window->glctx = SDL_GL_CreateContext(window->window);
     if (window->glctx == NULL) {
         asc_dprintf("Creating GL context failed for window %u", window->id);
     } else {
         glewExperimental = GL_TRUE;
         GLenum err = glewInit();
         if (err == GLEW_OK) {
             SDL_GL_SetSwapInterval(settings->vsync);
             glEnable(GL_DEPTH_TEST);
             glEnable(GL_BLEND);
             glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
             glEnable(GL_DEBUG_OUTPUT);
             glDebugMessageCallback(asc_gl_debug_callback, NULL);
             asc_dprintf("Window %u initialized", window->id);
             if (asc_primitives_init(&window->primitives)) {
                 asc_context.active_window = window;
                 return window;
             } else {
                 asc_dprintf("!!! Creating primitives for window %u failed !!!", window->id);
             }
         } else {
             asc_error(glewGetErrorString(err));
         }
     }
     // cleanup on error
     if (window->glctx != NULL) {
         SDL_GL_DeleteContext(window->glctx);
     }
     window->glctx = NULL;
     SDL_DestroyWindow(window->window);
     window->window = NULL;
     window->id = 0;
 }
 void asc_window_destroy(AscWindow* window) {
     // safeguard
     if (window->id == 0) return;
     // this window cannot be active anymore
     if (asc_context.active_window == window) {
         asc_context.active_window = NULL;
     }
     // release context related data (we have to make the GL context current for this)
     SDL_GL_MakeCurrent(window->window, window->glctx);
     asc_primitives_destroy(&window->primitives);
     // destroy the GL context and the window
     if (window->glctx != NULL) {
         SDL_GL_DeleteContext(window->glctx);
     }
     if (window->window != NULL) {
         SDL_DestroyWindow(window->window);
     }
     // if another window was active, make the other context current again
     if (asc_context.active_window != NULL) {
         AscWindow const *aw = asc_context.active_window;
         SDL_GL_MakeCurrent(aw->window, aw->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 const* window) {
     AscWindow const *active_window = asc_context.active_window;
     if (window != active_window) {
         asc_window_activate(window);
     }
     SDL_GL_SwapWindow(window->window);
     glViewport(0, 0, window->dimensions.width, window->dimensions.height);
     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     if (window != active_window) {
         asc_window_activate(active_window);
     }
 }
 void asc_window_activate(AscWindow const *window) {
     SDL_GL_MakeCurrent(window->window, window->glctx);
     asc_context.active_window = window;
 }

Mercurial > hg > ascension / annotate

src/window.c@25013a35e07d (annotated)

src/window.c