kc3-lang/kc3/gl/gl_lines.c

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• Hash : 3224e42f
  Author : Thomas de Grivel
  Date : 2025-10-03T19:45:23
  

  wip kpkg
  

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• gl/gl_lines.c

• /* kc3
   * Copyright from 2022 to 2025 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include "../libkc3/kc3.h"
  #include "gl_lines.h"
  #include "gl_vertex.h"
  
  s_gl_lines * gl_lines_allocate (s_gl_lines *lines, u32 lines_count)
  {
    uw vertex_count;
    assert(lines);
    assert(lines_count);
    vertex_count = lines_count * 2;
    if (! array_init(&lines->vertex, sym_1("GL.Vertex[]"), 1,
                     &vertex_count) ||
        ! array_allocate(&lines->vertex))
      return NULL;
    return lines;
  }
  
  void gl_lines_clean (s_gl_lines *lines)
  {
    assert(lines);
    array_clean(&lines->vertex);
    /* glDeleteVertexArrays(1, &lines->gl_vao); // VAO not supported in GLES 2.0 */
    glDeleteBuffers(1, &lines->gl_vbo);
  }
  
  s_gl_lines * gl_lines_init (s_gl_lines *lines)
  {
    s_gl_lines tmp = {0};
    assert(glGetError() == GL_NO_ERROR);
    /* glGenVertexArrays(1, &tmp.gl_vao); // VAO not supported in GLES 2.0 */
    glGenBuffers(1, &tmp.gl_vbo);
    assert(glGetError() == GL_NO_ERROR);
    *lines = tmp;
    return lines;
  }
  
  void gl_lines_render (const s_gl_lines *lines, u32 lines_count)
  {
    assert(lines);
    if (lines_count > lines->vertex.count / 2)
      lines_count = lines->vertex.count / 2;
    assert(glGetError() == GL_NO_ERROR);
    glBindBuffer(GL_ARRAY_BUFFER, lines->gl_vbo);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void*)offsetof(s_gl_vertex, pos_x));
    glEnableVertexAttribArray(0);
    assert(glGetError() == GL_NO_ERROR);
    glDrawArrays(GL_LINES, 0, lines_count * 2);
    assert(glGetError() == GL_NO_ERROR);
  }
  
  bool gl_lines_update (s_gl_lines *lines, u32 lines_count)
  {
    //GLenum gl_error;
    assert(lines);
    assert(lines->gl_vbo);
    assert(lines->vertex.data);
    assert(glGetError() == GL_NO_ERROR);
    if (lines_count > lines->vertex.count / 2)
      lines_count = lines->vertex.count / 2;
    assert(glGetError() == GL_NO_ERROR);
    glBindBuffer(GL_ARRAY_BUFFER, lines->gl_vbo);
    assert(glGetError() == GL_NO_ERROR);
    glBufferData(GL_ARRAY_BUFFER, lines_count * 2 * sizeof(s_gl_vertex),
                 lines->vertex.data, GL_DYNAMIC_DRAW);
    assert(glGetError() == GL_NO_ERROR);
    gl_vertex_attrib();
    assert(glGetError() == GL_NO_ERROR);
    return true;
  }
  

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