kc3-lang/kc3/gl/gl_vertex.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_vertex.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 "mat4.h"
  #include "vec3.h"
  #include "gl_vertex.h"
  
  sw buf_inspect_gl_vertex (s_buf *buf, const s_gl_vertex *v)
  {
    sw r;
    sw result = 0;
    assert(buf);
    assert(v);
    if ((r = buf_write_1(buf, "%GL.Vertex{pos_x: ")) < 0)
      return r;
    result += r;
    if ((r = buf_inspect_f32(buf, v->pos_x)) < 0)
      return r;
    result += r;
    if ((r = buf_write_1(buf, ", pos_y: ")) < 0)
      return r;
    result += r;
    if ((r = buf_inspect_f32(buf, v->pos_y)) < 0)
      return r;
    result += r;
    if ((r = buf_write_1(buf, ", pos_z: ")) < 0)
      return r;
    result += r;
    if ((r = buf_inspect_f32(buf, v->pos_z)) < 0)
      return r;
    result += r;
    if ((r = buf_write_1(buf, "}")) < 0)
      return r;
    result += r;
    buf_flush(buf);
    return result;
  }
  
  sw err_inspect_gl_vertex (const s_gl_vertex *v)
  {
    return buf_inspect_gl_vertex(env_global()->err, v);
  }
  
  void gl_vertex_attrib (void)
  {
    assert(glGetError() == GL_NO_ERROR);
    glEnableVertexAttribArray(0);
    assert(glGetError() == GL_NO_ERROR);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void *) 0);
    assert(glGetError() == GL_NO_ERROR);
    glEnableVertexAttribArray(1);
    assert(glGetError() == GL_NO_ERROR);
    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void *) (3 * sizeof(float)));
    assert(glGetError() == GL_NO_ERROR);
    glEnableVertexAttribArray(2);
    assert(glGetError() == GL_NO_ERROR);
    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void *) (6 * sizeof(float)));
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_vertex_transform (s_gl_vertex *vertex, const s_mat4 *matrix)
  {
    assert(vertex);
    assert(matrix);
    mat4_mult_vec3(matrix, (s_vec3 *) &vertex->pos_x,
                   (s_vec3 *) &vertex->pos_x);
    mat4_mult_vec3(matrix, (s_vec3 *) &vertex->normal_x,
                   (s_vec3 *) &vertex->normal_x);
    vec3_normalize((s_vec3 *) &vertex->normal_x);
  }
  

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