ascension: src/text.c@26ebb2f1e6e6

     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/ui/text.h"

    29 #include "ascension/context.h"

    30 #include "ascension/error.h"

    31 #include "ascension/shader.h"

    33 #include <cx/printf.h>

    35 #include <GL/glew.h>

    37 static void asc_text_draw(AscText const *node) {

    38     // Obtain shader

    39     AscShaderSprite *shader = &asc_context.active_window->glctx.shader.sprite;

    41     // Upload model matrix

    42     glUniformMatrix4fv(shader->base.model, 1,

    43                        GL_FALSE, node->base.world_transform);

    45     // Bind texture

    46     asc_texture_bind(&node->tex, shader->tex, 0);

    48     // Apply depth

    49     glUniform1f(shader->depth, (float)(node->base.depth));

    51     // Draw mesh

    52     asc_primitives_draw_plane();

    53 }

    55 static void asc_text_update(AscText *node) {

    56     // Generate new texture, if required

    57     if (asc_texture_uninitialized(&node->tex)) {

    58         asc_texture_init_rectangle(&node->tex);

    59     }

    61     // Render text onto a surface

    62     TTF_Font *font = asc_font_cache_validate(node->font)->ptr;

    63     static int alignments[] = {

    64             TTF_WRAPPED_ALIGN_LEFT,

    65             TTF_WRAPPED_ALIGN_CENTER,

    66             TTF_WRAPPED_ALIGN_RIGHT

    67     };

    68     TTF_SetFontWrappedAlign(

    69             font, alignments[node->base.flags & ASC_TEXT_ALIGNMENT_MASK]);

    70     SDL_Surface *surface = TTF_RenderUTF8_Blended_Wrapped(

    71             font, node->text.ptr, asc_col_sdl(node->color), node->max_width

    72     );

    73     if (surface == NULL) {

    74         asc_error(SDL_GetError());

    75         return;

    76     }

    77     asc_set_scale2d(&node->base, surface->w, surface->h);

    78     if (asc_test_flag(node->base.flags, ASC_TEXT_CENTERED_FLAG)) {

    79         unsigned short newoffx = surface->w / 2;

    80         asc_vec2i pos = asc_get_position2d(&node->base);

    81         asc_set_position2d(&node->base, pos.x + node->offx - newoffx, pos.y);

    82         node->offx = newoffx;

    83     }

    85     // Transfer Image Data

    86     asc_texture_from_surface(&node->tex, surface);

    88     // Free the surface

    89     SDL_FreeSurface(surface);

    90 }

    92 AscSceneNode *asc_text(int x, int y, char const *text) {

    93     // TODO: implement fancy struct "named param" initialization

    94     AscText *node = calloc(1, sizeof(AscText));

    96     node->base.render_group = ASC_RENDER_GROUP_SPRITE_BLEND;

    97     node->base.free_func = (asc_scene_free_func) asc_text_free;

    98     node->base.update_func = (asc_scene_update_func) asc_text_update;

    99     node->base.draw_func = (asc_scene_draw_func) asc_text_draw;

   101     node->base.position.x = (float) x;

   102     node->base.position.y = (float) y;

   103     node->font = asc_context.active_font;

   104     node->color = asc_context.ink;

   105     if (text == NULL) {

   106         node->text = cx_mutstr(strdup(" "));

   107     } else {

   108         node->text = cx_mutstr(strdup(text));

   109     }

   111     // initialize

   112     asc_text_update(node);

   114     return &node->base;

   115 }

   117 void asc_text_free(AscText *node) {

   118     asc_texture_destroy(&node->tex);

   119     cx_strfree(&node->text);

   120     free(node);

   121 }

   123 void asc_text_printf(

   124         AscSceneNode *node,

   125         char const* format,

   126         ...

   127 ) {

   128     cxmutstr text = ((AscText*)node)->text;

   129     va_list ap;

   130     va_start(ap, format);

   131     cx_vsprintf(&text.ptr, &text.length, format, ap);

   132     va_end(ap);

   133     asc_node_update(node);

   134 }

Mercurial > hg > ascension / file revision