ascension: src/text.c@1d001eb694dc (annotated)

src/text.c@1d001eb694dc (annotated)

src/text.c

Tue, 23 Jan 2024 21:34:12 +0100

author: Mike Becker <universe@uap-core.de>
date: Tue, 23 Jan 2024 21:34:12 +0100
changeset 29: 1d001eb694dc
parent 26: 139dac8ef9ee
child 32: 86468a71dd73
permissions: -rw-r--r--

bring first scene graph to live

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  * Copyright 2023 Mike Becker. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include "ascension/text.h"
 #include "ascension/context.h"
 #include "ascension/error.h"
 #include "ascension/shader.h"
 #include <GL/glew.h>
 static void asc_text_draw(AscText const *node) {
     if (node->color.alpha == 0 || node->hidden || node->internal.tex_id == 0) {
         return;
     }
     glUseProgram(ASC_SHADER_FONT.base.id);
     // Upload projection
     // TODO: when we group UI draw calls, we don't need this
     glUniformMatrix4fv(ASC_SHADER_FONT.base.projection, 1,
                        GL_FALSE, asc_context.active_window->projection);
     // Upload model matrix
     asc_mat4f model = {0};
     model[asc_mat4_index(0, 0)] = node->internal.dimension.width;
     model[asc_mat4_index(1, 1)] = node->internal.dimension.height;
     model[asc_mat4_index(3, 0)] = node->position.x;
     model[asc_mat4_index(3, 1)] = node->position.y;
     model[asc_mat4_index(3, 3)] = 1;
     glUniformMatrix4fv(ASC_SHADER_FONT.base.model, 1, GL_FALSE, model);
     // Upload surface
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(GL_TEXTURE_RECTANGLE, node->internal.tex_id);
     glUniform1i(ASC_SHADER_FONT.surface, 0);
     // Draw mesh
     asc_primitives_draw_plane();
 }
 AscText *asc_text(int x, int y, char const *text) {
     AscText *node = calloc(1, sizeof(AscText));
     if (node == NULL) {
         asc_error("Out of memory.");
         return NULL;
     }
     node->node.free_func = (asc_scene_free_func) asc_text_free;
     node->node.draw_func = (asc_scene_draw_func) asc_text_draw;
     node->position = (asc_vec2i) {x, y};
     node->font = asc_context.active_font;
     node->color = asc_context.ink;
     if (text != NULL) {
         node->text = strdup(text);
     }
     return node;
 }
 void asc_text_update(AscText *node) {
     // short circuit if fully transparent or hidden, we don't need anything
     if (node->color.alpha == 0 || node->hidden) {
         return;
     }
     // Generate new texture, if required
     if (node->internal.tex_id == 0) {
         glGenTextures(1, &node->internal.tex_id);
         glBindTexture(GL_TEXTURE_RECTANGLE, node->internal.tex_id);
         glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
         glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
         asc_dprintf("Generated new texture for text node: %u", node->internal.tex_id);
     }
     // Render text onto a surface
     SDL_Surface *surface = TTF_RenderUTF8_Blended_Wrapped(
             asc_font_cache_validate(node->font)->ptr,
             node->text,
             asc_col_sdl(node->color),
             node->max_width
     );
     if (surface == NULL) {
         asc_error(SDL_GetError());
         return;
     }
     // Store basic node information
     node->position = node->position;
     node->internal.dimension.width = surface->w;
     node->internal.dimension.height = surface->h;
     // Transfer Image Data
     // TODO: move the image data transfer to a separate function - we will need it more often
     glBindTexture(GL_TEXTURE_RECTANGLE, node->internal.tex_id);
     glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format->BytesPerPixel);
     glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA,
                  surface->w, surface->h,
 , GL_BGRA, GL_UNSIGNED_BYTE, surface->pixels);
     // Free the surface
     SDL_FreeSurface(surface);
 }
 void asc_text_free(AscText *node) {
     asc_dprintf("Release text node texture: %u", node->internal.tex_id);
     glDeleteTextures(1, &node->internal.tex_id);
     free(node->text);
     free(node);
 }

Mercurial > hg > ascension / annotate

src/text.c@1d001eb694dc (annotated)

src/text.c