Example #1
0
//opengl scene, params: input texture (not the output filter->texture)
static void
gst_gl_bumper_callback (gint width, gint height, guint texture, gpointer stuff)
{
  static GLfloat xrot = 0;
  static GLfloat yrot = 0;
  static GLfloat zrot = 0;

  GstGLFuncs *gl;
  GstGLBumper *bumper = GST_GL_BUMPER (stuff);
  GstGLContext *context = GST_GL_FILTER (bumper)->context;
  GLint locTangent = 0;

  //choose the lights
  GLfloat light_direction0[] = { 1.0, 0.0, -1.0, 0.0 }; // light goes along -x
  GLfloat light_direction1[] = { -1.0, 0.0, -1.0, 0.0 };        // light goes along x
  GLfloat light_diffuse0[] = { 1.0, 1.0, 1.0, 1.0 };
  GLfloat light_diffuse1[] = { 1.0, 1.0, 1.0, 1.0 };
  GLfloat mat_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };

/* *INDENT-OFF* */
  MeshData mesh[] = {
   /* |     Vertex      |     Normal      |TexCoord0|TexCoord1|  VertexAttrib  | */
/*F*/ { 1.0,  1.0, -1.0,  0.0,  0.0, -1.0, 0.0, 0.0, 0.0, 0.0,  0.0,  1.0,  0.0},
/*r*/ { 1.0, -1.0, -1.0,  0.0,  0.0, -1.0, 1.0, 0.0, 1.0, 0.0,  0.0,  1.0,  0.0},
/*o*/ {-1.0, -1.0, -1.0,  0.0,  0.0, -1.0, 1.0, 1.0, 1.0, 1.0,  0.0,  1.0,  0.0},
      {-1.0,  1.0, -1.0,  0.0,  0.0, -1.0, 0.0, 1.0, 0.0, 1.0,  0.0,  1.0,  0.0},
/*R*/ {-1.0,  1.0, -1.0, -1.0,  0.0,  0.0, 0.0, 0.0, 0.0, 0.0,  0.0,  1.0,  0.0},
/*i*/ {-1.0, -1.0, -1.0, -1.0,  0.0,  0.0, 1.0, 0.0, 1.0, 0.0,  0.0,  1.0,  0.0},
/*g*/ {-1.0, -1.0,  1.0, -1.0,  0.0,  0.0, 1.0, 1.0, 1.0, 1.0,  0.0,  1.0,  0.0},
      {-1.0,  1.0,  1.0, -1.0,  0.0,  0.0, 0.0, 1.0, 0.0, 1.0,  0.0,  1.0,  0.0},
/*B*/ {-1.0,  1.0,  1.0,  0.0,  0.0,  1.0, 0.0, 0.0, 0.0, 0.0,  0.0,  1.0,  0.0},
/*a*/ {-1.0, -1.0,  1.0,  0.0,  0.0,  1.0, 1.0, 0.0, 1.0, 0.0,  0.0,  1.0,  0.0},
/*c*/ { 1.0, -1.0,  1.0,  0.0,  0.0,  1.0, 1.0, 1.0, 1.0, 1.0,  0.0,  1.0,  0.0},
      { 1.0,  1.0,  1.0,  0.0,  0.0,  1.0, 0.0, 1.0, 0.0, 1.0,  0.0,  1.0,  0.0},
/*L*/ { 1.0,  1.0,  1.0,  1.0,  0.0,  0.0, 0.0, 0.0, 0.0, 0.0,  0.0,  1.0,  0.0},
/*e*/ { 1.0, -1.0,  1.0,  1.0,  0.0,  0.0, 1.0, 0.0, 1.0, 0.0,  0.0,  1.0,  0.0},
/*f*/ { 1.0, -1.0, -1.0,  1.0,  0.0,  0.0, 1.0, 1.0, 1.0, 1.0,  0.0,  1.0,  0.0},
      { 1.0,  1.0, -1.0,  1.0,  0.0,  0.0, 0.0, 1.0, 0.0, 1.0,  0.0,  1.0,  0.0},
/*T*/ { 1.0,  1.0,  1.0,  0.0,  1.0,  0.0, 0.0, 0.0, 0.0, 0.0,  0.0,  0.0,  1.0},
/*o*/ { 1.0,  1.0, -1.0,  0.0,  1.0,  0.0, 1.0, 0.0, 1.0, 0.0,  0.0,  0.0,  1.0},
/*p*/ {-1.0,  1.0, -1.0,  0.0,  1.0,  0.0, 1.0, 1.0, 1.0, 1.0,  0.0,  0.0,  1.0},
      {-1.0,  1.0,  1.0,  0.0,  1.0,  0.0, 0.0, 1.0, 0.0, 1.0,  0.0,  0.0,  1.0},
/*B*/ { 1.0, -1.0, -1.0,  0.0, -1.0,  0.0, 0.0, 0.0, 0.0, 0.0,  0.0,  0.0, -1.0},
/*o*/ { 1.0, -1.0,  1.0,  0.0, -1.0,  0.0, 1.0, 0.0, 1.0, 0.0,  0.0,  0.0, -1.0},
/*t*/ {-1.0, -1.0,  1.0,  0.0, -1.0,  0.0, 1.0, 1.0, 1.0, 1.0,  0.0,  0.0, -1.0},
      {-1.0, -1.0, -1.0,  0.0, -1.0,  0.0, 0.0, 1.0, 0.0, 1.0,  0.0,  0.0, -1.0},
  };

  GLushort indices[] = {
    0, 1, 2,
    0, 2, 3,
    4, 5, 6,
    4, 6, 7,
    8, 9, 10,
    8, 10, 11,
    12, 13, 14,
    12, 14, 15,
    16, 17, 18,
    16, 18, 19,
    20, 21, 22,
    20, 22, 23
  };

/* *INDENT-ON* */

  gl = GST_GL_FILTER (bumper)->context->gl_vtable;

  //eye point
  gl->MatrixMode (GL_PROJECTION);
  gluLookAt (0.0, 0.0, -6.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
  gl->MatrixMode (GL_MODELVIEW);

  //scene conf
  gl->Enable (GL_DEPTH_TEST);
  gl->DepthFunc (GL_LEQUAL);
  gl->Hint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

  gl->ShadeModel (GL_SMOOTH);

  //set the lights
  gl->Lightfv (GL_LIGHT0, GL_POSITION, light_direction0);
  gl->Lightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse0);
  gl->Lightfv (GL_LIGHT1, GL_POSITION, light_direction1);
  gl->Lightfv (GL_LIGHT1, GL_DIFFUSE, light_diffuse1);
  gl->Materialfv (GL_FRONT, GL_DIFFUSE, mat_diffuse);
  gl->ColorMaterial (GL_FRONT_AND_BACK, GL_DIFFUSE);
  gl->Enable (GL_COLOR_MATERIAL);
  gl->Enable (GL_LIGHTING);
  gl->Enable (GL_LIGHT0);
  gl->Enable (GL_LIGHT1);
  //configure shader
  gst_gl_shader_use (bumper->shader);
  locTangent =
      gst_gl_shader_get_attribute_location (bumper->shader, "aTangent");

  //set the normal map
  gl->ActiveTexture (GL_TEXTURE1);
  gst_gl_shader_set_uniform_1i (bumper->shader, "texture1", 1);
  gl->BindTexture (GL_TEXTURE_2D, bumper->bumpmap);

  //set the video texture
  gl->ActiveTexture (GL_TEXTURE0);
  gst_gl_shader_set_uniform_1i (bumper->shader, "texture0", 0);
  gl->BindTexture (GL_TEXTURE_2D, texture);

  gl->Rotatef (xrot, 1.0f, 0.0f, 0.0f);
  gl->Rotatef (yrot, 0.0f, 1.0f, 0.0f);
  gl->Rotatef (zrot, 0.0f, 0.0f, 1.0f);

  gl->EnableVertexAttribArray (locTangent);

  gl->ClientActiveTexture (GL_TEXTURE0);
  gl->EnableClientState (GL_TEXTURE_COORD_ARRAY);
  gl->EnableClientState (GL_VERTEX_ARRAY);
  gl->EnableClientState (GL_NORMAL_ARRAY);

  gl->VertexAttribPointer (locTangent, 3, GL_FLOAT, 0, sizeof (MeshData),
      &mesh[0].va0);
  gl->VertexPointer (3, GL_FLOAT, sizeof (MeshData), &mesh[0].x);
  gl->NormalPointer (GL_FLOAT, sizeof (MeshData), &mesh[0].nx);
  gl->TexCoordPointer (2, GL_FLOAT, sizeof (MeshData), &mesh[0].s0);

  gl->ClientActiveTexture (GL_TEXTURE1);
  gl->EnableClientState (GL_TEXTURE_COORD_ARRAY);
  gl->TexCoordPointer (2, GL_FLOAT, sizeof (MeshData), &mesh[0].s1);

  gl->DrawElements (GL_TRIANGLES, 36, GL_UNSIGNED_SHORT, indices);

  gl->DisableClientState (GL_VERTEX_ARRAY);
  gl->DisableClientState (GL_TEXTURE_COORD_ARRAY);
  gl->DisableClientState (GL_NORMAL_ARRAY);

  gl->ClientActiveTexture (GL_TEXTURE0);
  gl->DisableClientState (GL_TEXTURE_COORD_ARRAY);

  gl->DisableVertexAttribArray (locTangent);

  gst_gl_context_clear_shader (context);

  gl->Disable (GL_LIGHT0);
  gl->Disable (GL_LIGHT1);
  gl->Disable (GL_LIGHTING);
  gl->Disable (GL_COLOR_MATERIAL);

  xrot += 1.0f;
  yrot += 0.9f;
  zrot += 0.6f;
}