ascension: src/text.c@6d100092fcd4

     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 <GL/glew.h>

    35 static void asc_text_draw(AscText const *node) {

    36     if (node->color.alpha == 0 || node->hidden) {

    37         return;

    38     }

    40     // Obtain shader

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

    43     // Upload model matrix

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

    45                        GL_FALSE, node->base.world_transform);

    47     // Bind texture

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

    50     // Apply depth

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

    53     // Draw mesh

    54     asc_primitives_draw_plane();

    55 }

    57 static void asc_text_update(AscText *node) {

    58     // short circuit if fully transparent or hidden, we don't need anything

    59     if (node->color.alpha == 0 || node->hidden) {

    60         return;

    61     }

    63     // Generate new texture, if required

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

    65         asc_texture_init_rectangle(&node->tex);

    66     }

    68     // Render text onto a surface

    69     SDL_Surface *surface = TTF_RenderUTF8_Blended_Wrapped(

    70             asc_font_cache_validate(node->font)->ptr,

    71             node->text,

    72             asc_col_sdl(node->color),

    73             node->max_width

    74     );

    75     if (surface == NULL) {

    76         asc_error(SDL_GetError());

    77         return;

    78     }

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

    80     asc_update_transform((AscSceneNode *) node);

    82     // Transfer Image Data

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

    85     // Free the surface

    86     SDL_FreeSurface(surface);

    87 }

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

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

    92     node->base.render_group = ASC_RENDER_GROUP_SPRITE_BLEND;

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

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

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

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

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

    99     node->font = asc_context.active_font;

   100     node->color = asc_context.ink;

   101     if (text != NULL) {

   102         node->text = strdup(text);

   103     }

   105     // initialize

   106     asc_text_update(node);

   108     return &node->base;

   109 }

   111 void asc_text_free(AscText *node) {

   112     asc_texture_destroy(&node->tex);

   113     free(node->text);

   114     free(node);

   115 }

Mercurial > hg > ascension / file revision