ascension: src/text.c@cb94d983e3dd

     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     // Obtain shader

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

    39     // Upload model matrix

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

    41                        GL_FALSE, node->base.world_transform);

    43     // Bind texture

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

    46     // Apply depth

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

    49     // Draw mesh

    50     asc_primitives_draw_plane();

    51 }

    53 static void asc_text_update(AscText *node) {

    54     // Generate new texture, if required

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

    56         asc_texture_init_rectangle(&node->tex);

    57     }

    59     // Render text onto a surface

    60     SDL_Surface *surface = TTF_RenderUTF8_Blended_Wrapped(

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

    62             node->text,

    63             asc_col_sdl(node->color),

    64             node->max_width

    65     );

    66     if (surface == NULL) {

    67         asc_error(SDL_GetError());

    68         return;

    69     }

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

    71     asc_update_transform((AscSceneNode *) node);

    73     // Transfer Image Data

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

    76     // Free the surface

    77     SDL_FreeSurface(surface);

    78 }

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

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

    83     node->base.render_group = ASC_RENDER_GROUP_SPRITE_BLEND;

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

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

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

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

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

    90     node->font = asc_context.active_font;

    91     node->color = asc_context.ink;

    92     if (text != NULL) {

    93         node->text = strdup(text);

    94     }

    96     // initialize

    97     asc_text_update(node);

    99     return &node->base;

   100 }

   102 void asc_text_free(AscText *node) {

   103     asc_texture_destroy(&node->tex);

   104     free(node->text);

   105     free(node);

   106 }

Mercurial > hg > ascension / file revision