kc3-lang/kc3/gl/gl_object.c

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• Hash : 36387f65
  Author : Thomas de Grivel
  Date : 2025-11-24T17:01:27
  

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• gl/gl_object.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_deprecated.h"
  #include "gl_object.h"
  #include "gl_vertex.h"
  
  s_gl_object * gl_object_allocate (s_gl_object *object, uw vertex_count,
                                    uw triangle_count)
  {
    assert(object);
    assert(vertex_count);
    if (! array_init(&object->vertex, sym_1("GL.Vertex[]"), 1,
                     &vertex_count) ||
        ! array_allocate(&object->vertex) ||
        ! array_init(&object->triangle, sym_1("GL.Triangle[]"), 1,
                     &triangle_count) ||
        ! array_allocate(&object->triangle))
      return NULL;
    return object;
  }
  
  void gl_object_clean (s_gl_object *object)
  {
    assert(object);
    assert(glGetError() == GL_NO_ERROR);
    if (object->gl_vbo)
      glDeleteBuffers(1, &object->gl_vbo);
    assert(glGetError() == GL_NO_ERROR);
    if (object->gl_ebo)
      glDeleteBuffers(1, &object->gl_ebo);
    assert(glGetError() == GL_NO_ERROR);
    array_clean(&object->vertex);
    array_clean(&object->triangle);
  }
  
  s_gl_object * gl_object_init (s_gl_object *object)
  {
    s_gl_object tmp = {0};
    assert(glGetError() == GL_NO_ERROR);
    glGenBuffers(1, &tmp.gl_vbo);
    if (! tmp.gl_vbo)
      return NULL;
    assert(glGetError() == GL_NO_ERROR);
    glGenBuffers(1, &tmp.gl_ebo);
    if (! tmp.gl_ebo)
      return NULL;
    assert(glGetError() == GL_NO_ERROR);
    *object = tmp;
    return object;
  }
  
  void gl_object_render (const s_gl_object *object)
  {
    GLenum error;
    assert(object);
    assert(glGetError() == GL_NO_ERROR);
    if (object->triangle.count == 0) {
      err_puts("gl_object_render: triangle count is 0!");
      return;
    }
    glBindBuffer(GL_ARRAY_BUFFER, object->gl_vbo);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void*)offsetof(s_gl_vertex, pos_x));
    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void*)offsetof(s_gl_vertex, normal_x));
    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void*)offsetof(s_gl_vertex, tex_coord_x));
    glEnableVertexAttribArray(0);
    glEnableVertexAttribArray(1);
    glEnableVertexAttribArray(2);
    assert(glGetError() == GL_NO_ERROR);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, object->gl_ebo);
    assert(glGetError() == GL_NO_ERROR);
    glDrawElements(GL_TRIANGLES, object->triangle.count * 3,
                   GL_UNSIGNED_INT,
                   NULL);
    if ((error = glGetError()) != GL_NO_ERROR) {
      err_write_1("gl_object_render: glDrawElements: ");
      err_puts(gl_error_string(error));
      assert(! "gl_object_render: glDrawElements");
    }
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_object_render_points (const s_gl_object *object, u32 count)
  {
    GLenum error;
    assert(object);
    assert(glGetError() == GL_NO_ERROR);
    glBindBuffer(GL_ARRAY_BUFFER, object->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_POINTS, 0, count);
    if ((error = glGetError()) != GL_NO_ERROR) {
      err_write_1("gl_object_render_points: glDrawArrays: ");
      err_puts(gl_error_string(error));
      assert(! "gl_object_render_points: glDrawArrays");
    }
  }
  
  void gl_object_render_triangles (const s_gl_object *object,
                                   u32 triangle_count)
  {
    GLenum error;
    assert(object);
    glBindBuffer(GL_ARRAY_BUFFER, object->gl_vbo);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void*)offsetof(s_gl_vertex, pos_x));
    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void*)offsetof(s_gl_vertex, normal_x));
    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(s_gl_vertex),
                          (void*)offsetof(s_gl_vertex, tex_coord_x));
    glEnableVertexAttribArray(0);
    glEnableVertexAttribArray(1);
    glEnableVertexAttribArray(2);
    assert(glGetError() == GL_NO_ERROR);
    glDrawArrays(GL_TRIANGLES, 0, triangle_count * 3);
    if ((error = glGetError()) != GL_NO_ERROR) {
      err_write_1("gl_object_render_triangles: glDrawArrays: ");
      err_puts(gl_error_string(error));
      assert(! "gl_object_render_triangles: glDrawArrays");
    }
  }
  
  void gl_object_render_wireframe (const s_gl_object *object)
  {
    assert(object);
    assert(glGetError() == GL_NO_ERROR);
    glBindBuffer(GL_ARRAY_BUFFER, object->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);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, object->gl_ebo);
    assert(glGetError() == GL_NO_ERROR);
    glDrawElements(GL_LINE_LOOP, object->triangle.count * 3,
                   GL_UNSIGNED_INT,
                   NULL);
    assert(glGetError() == GL_NO_ERROR);
  }
  
  void gl_object_transform (s_gl_object *object, const s_mat4 *matrix)
  {
    u32 i;
    s_gl_vertex *vertex;
    assert(object);
    assert(matrix);
    vertex = object->vertex.data;
    i = 0;
    while (i < object->vertex.count) {
      gl_vertex_transform(vertex, matrix);
      vertex++;
      i++;
    }
  }
  
  bool gl_object_update (s_gl_object *object)
  {
    //GLenum gl_error;
    assert(object);
    assert(object->gl_vbo);
    assert(object->gl_ebo);
    assert(object->vertex.data);
    assert(object->triangle.data);
    assert(glGetError() == GL_NO_ERROR);
    /* glBindVertexArray(object->gl_vao); // VAO not supported in GLES 2.0 */
    assert(glGetError() == GL_NO_ERROR);
    glBindBuffer(GL_ARRAY_BUFFER, object->gl_vbo);
    assert(glGetError() == GL_NO_ERROR);
    glBufferData(GL_ARRAY_BUFFER,
                 object->vertex.count * sizeof(s_gl_vertex),
                 object->vertex.data, GL_DYNAMIC_DRAW);
    assert(glGetError() == GL_NO_ERROR);
    gl_vertex_attrib();
    assert(glGetError() == GL_NO_ERROR);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, object->gl_ebo);
    assert(glGetError() == GL_NO_ERROR);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER,
                 object->triangle.count * sizeof(s_gl_triangle),
                 object->triangle.data, GL_DYNAMIC_DRAW);
    assert(glGetError() == GL_NO_ERROR);
    return true;
  }
  

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