src/ascension/context.h

/*
 * 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.
 */

#ifndef ASCENSION_CONTEXT_H
#define ASCENSION_CONTEXT_H

#include "datatypes.h"
#include "window.h"
#include "input.h"
#include "ui/font.h"

#include <cx/buffer.h>
#include <cx/string.h>

/** The flag for the overall initialized state. */
#define ASC_FLAG_INITILIZED  0x01u

/** Flag is set when the error buffer contains new error information. */
#define ASC_FLAG_HAS_ERROR  0x02u

/** Flag is set when SDL wants to quit the application. */
#define ASC_FLAG_QUIT 0x80000000u

/**
 * The global ascension context.
 */
typedef struct AscContext {
    unsigned int flags;
    CxBuffer error_buffer;
    cxmutstr font_path;
    cxmutstr shader_path;
    cxmutstr texture_path;
    AscInput input;
    AscWindow windows[ASC_MAX_WINDOWS];
    AscFont active_font;
    unsigned char fonts_loaded;
    unsigned char active_window;
    asc_col4i ink;
    uint64_t frame_nanos;
    uint64_t total_nanos;
} AscContext;

/** Global ascension context. */
extern AscContext asc_context;

/**
 * The currently active font.
 * @see asc_font()
 */
#define asc_active_font asc_context.active_font

#ifdef NDEBUG
/**
 * The currently active window in the context.
 * @see asc_window_activate()
 */
#define asc_active_window \
    (&asc_context.windows[asc_context.active_window])
#else
/**
 * The currently active window in the context.
 * @see asc_window_activate()
 */
#define asc_active_window asc_active_window_assert()
AscWindow *asc_active_window_assert(void);
#endif // NDEBUG

void asc_context_initialize(void);
void asc_context_destroy(void);

/**
 * Signals the context that we want to quit the application.
 */
void asc_context_quit(void);

/**
 * Dispatches events and synchronizes all initialized windows.
 *
 * @return false, if the application wants to quit, true otherwise
 */
bool asc_loop_next(void);

/**
 * Sets the active drawing color.
 */
#define asc_ink(color) asc_context.ink = (color)
#define asc_ink_rgba(r,g,b,a) asc_context.ink = (asc_col4i){(r),(g),(b),(a)}
#define asc_ink_rgb(r,g,b) asc_context.ink = (asc_col4i){(r),(g),(b),255u}


void asc_set_font_path(const char *path);
void asc_set_shader_path(const char *path);
void asc_set_texture_path(const char *path);

#endif /* ASCENSION_CONTEXT_H */