ascension: src/text.c@25013a35e07d

     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/text.h"

    29 #include "ascension/context.h"

    30 #include "ascension/error.h"

    31 #include "ascension/shader.h"

    33 #include <GL/glew.h>

    35 void asc_text_draw_lb(

    36         AscTextNode *node,

    37         asc_vec2i position,

    38         unsigned max_width,

    39         cxmutstr text) {

    41     // short circuit - if fully transparent, just hide it

    42     if (asc_context.ink.alpha == 0) {

    43         node->hidden = true;

    44         return;

    45     }

    47     // Generate new texture, if required

    48     if (node->tex_id == 0) {

    49         glGenTextures(1, &node->tex_id);

    50         glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);

    51         glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    52         glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    53         asc_dprintf("Generated new texture for text node: %u", node->tex_id);

    54     }

    56     // Render text onto a surface

    57     SDL_Surface *surface = TTF_RenderText_Blended_Wrapped(

    58             asc_context.active_font->ptr,

    59             text.ptr,

    60             (SDL_Color) {

    61                     .r = asc_context.ink.red,

    62                     .g = asc_context.ink.green,

    63                     .b = asc_context.ink.blue,

    64                     .a = asc_context.ink.alpha

    65             },

    66             max_width

    67     );

    68     if (surface == NULL) {

    69         asc_error(SDL_GetError());

    70         return;

    71     }

    73     // Store basic node information

    74     node->position = position;

    75     node->dimension.width = surface->w;

    76     node->dimension.height = surface->h;

    78     // Transfer Image Data

    79     // TODO: move the image data transfer to a separate function - we will need it more often

    80     glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);

    81     glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format->BytesPerPixel);

    82     glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA,

    83                  surface->w, surface->h,

    84                  0, GL_BGRA, GL_UNSIGNED_BYTE, surface->pixels);

    86     // Free the surface

    87     SDL_FreeSurface(surface);

    89     // Redraw the node

    90     asc_text_redraw(node);

    91 }

    93 void asc_text_draw(

    94         AscTextNode *node,

    95         asc_vec2i position,

    96         cxmutstr text) {

    97     unsigned max_width = asc_context.active_window->dimensions.width - position.width;

    98     asc_text_draw_lb(node, position, max_width, text);

    99 }

   101 void asc_text_redraw(AscTextNode *node) {

   102     if (node->hidden) return;

   104     if (node->tex_id == 0) {

   105         asc_error("Tried to redraw text node after destruction");

   106         return;

   107     }

   109     glUseProgram(ASC_SHADER_FONT.base.id);

   111     // Upload projection

   112     // TODO: when we group UI draw calls, we don't need this

   113     glUniformMatrix4fv(ASC_SHADER_FONT.base.projection, 1, GL_FALSE, asc_context.active_window->projection);

   115     // Upload model matrix

   116     asc_mat4f model = {0};

   117     model[asc_mat4_index(0, 0)] = node->dimension.width;

   118     model[asc_mat4_index(1, 1)] = node->dimension.height;

   119     model[asc_mat4_index(3, 0)] = node->position.x;

   120     model[asc_mat4_index(3, 1)] = node->position.y;

   121     model[asc_mat4_index(3, 3)] = 1;

   122     glUniformMatrix4fv(ASC_SHADER_FONT.base.model, 1, GL_FALSE, model);

   124     // Upload surface

   125     glActiveTexture(GL_TEXTURE0);

   126     glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);

   127     glUniform1i(ASC_SHADER_FONT.surface, 0);

   129     // Draw mesh

   130     asc_primitives_draw_plane();

   131 }

   133 void asc_text_destroy(AscTextNode *node) {

   134     asc_dprintf("Release text node texture: %u", node->tex_id);

   135     glDeleteTextures(1, &node->tex_id);

   136     node->tex_id = 0;

   137 }

Mercurial > hg > ascension / file revision