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kc3-lang/kc3/libc3_window/sdl2/gl_vertex.c

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  • Author : thodg Thomas de Grivel
    Date : 2024-03-24 14:53:08
    Hash : 75270fe7
    Message : move libc3/window to libc3_window, shorter build messages and build log for libc3 (see configure)

  • libc3_window/sdl2/gl_vertex.c 
  • /* c3
 * Copyright 2022-2024 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 <libc3/c3.h>
#include "mat4.h"
#include "vec3.h"
#include "gl_vertex.h"

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);
}