ascension: src/text.c@b3da4096c607

create own compilation unit for GL context - fixes shader not being created per context

     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 static void asc_text_draw(AscText const *node) {

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

    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.final_transform);

    47     // Upload surface

    48     glActiveTexture(GL_TEXTURE0);

    49     glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);

    50     glUniform1i(shader->surface, 0);

    52     // Apply depth

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

    55     // Draw mesh

    56     asc_primitives_draw_plane();

    57 }

    59 static void asc_text_update_transform(AscText *node) {

    60     asc_transform_scale2i(node->base.local_transform, node->dimension);

    61     asc_transform_translate2i(node->base.world_transform, node->position);

    62 }

    64 static void asc_text_update(AscText *node) {

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

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

    67         return;

    68     }

    70     // Generate new texture, if required

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

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

    73         glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);

    74         glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    75         glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

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

    77     }

    79     // Render text onto a surface

    80     SDL_Surface *surface = TTF_RenderUTF8_Blended_Wrapped(

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

    82             node->text,

    83             asc_col_sdl(node->color),

    84             node->max_width

    85     );

    86     if (surface == NULL) {

    87         asc_error(SDL_GetError());

    88         return;

    89     }

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

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

    92     asc_node_update_transform((AscSceneNode *) node);

    94     // Transfer Image Data

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

    96     glBindTexture(GL_TEXTURE_RECTANGLE, node->tex_id);

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

    98     glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA,

    99                  surface->w, surface->h,

   100                  0, GL_BGRA, GL_UNSIGNED_BYTE, surface->pixels);

   102     // Free the surface

   103     SDL_FreeSurface(surface);

   104 }

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

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

   108     if (node == NULL) {

   109         asc_error("Out of memory.");

   110         return NULL;

   111     }

   113     node->base.render_group = ASC_RENDER_GROUP_SPRITE_BLEND;

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

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

   116     node->base.transform_update_func = (asc_scene_update_func) asc_text_update_transform;

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

   119     node->position.x = x;

   120     node->position.y = y;

   121     node->font = asc_context.active_font;

   122     node->color = asc_context.ink;

   123     if (text != NULL) {

   124         node->text = strdup(text);

   125     }

   127     // initialize

   128     asc_text_update(node);

   129     asc_text_update_transform(node);

   131     return &node->base;

   132 }

   134 void asc_text_free(AscText *node) {

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

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

   137     free(node->text);

   138     free(node);

   139 }

Mercurial > hg > ascension / file revision