C++ GstGLFuncs::Disable方法代码示例

void
gst_gl_effects_xray_step_five (gint width, gint height, guint texture,
    gpointer data)
{
  GstGLShader *shader;
  GstGLEffects *effects = GST_GL_EFFECTS (data);
  GstGLFilter *filter = GST_GL_FILTER (effects);
  GstGLContext *context = filter->context;
  GstGLFuncs *gl = context->gl_vtable;

  shader = g_hash_table_lookup (effects->shaderstable, "xray4");

  if (!shader) {
    shader = gst_gl_shader_new (context);
    g_hash_table_insert (effects->shaderstable, "xray4", shader);
  }

  if (!gst_gl_shader_compile_and_check (shader,
          multiply_fragment_source, GST_GL_SHADER_FRAGMENT_SOURCE)) {
    gst_gl_context_set_error (context, "Failed to initialize multiply shader");
    GST_ELEMENT_ERROR (effects, RESOURCE, NOT_FOUND,
        ("%s", gst_gl_context_get_error ()), (NULL));
    return;
  }

  gl->MatrixMode (GL_PROJECTION);
  gl->LoadIdentity ();

  gst_gl_shader_use (shader);

  gl->ActiveTexture (GL_TEXTURE2);
  gl->Enable (GL_TEXTURE_2D);
  gl->BindTexture (GL_TEXTURE_2D, effects->midtexture[2]);
  gl->Disable (GL_TEXTURE_2D);

  gst_gl_shader_set_uniform_1i (shader, "base", 2);

  gl->ActiveTexture (GL_TEXTURE1);
  gl->Enable (GL_TEXTURE_2D);
  gl->BindTexture (GL_TEXTURE_2D, texture);
  gl->Disable (GL_TEXTURE_2D);

  gst_gl_shader_set_uniform_1f (shader, "alpha", (gfloat) 0.5f);
  gst_gl_shader_set_uniform_1i (shader, "blend", 1);

  gst_gl_filter_draw_texture (filter, texture, width, height);
}

//opengl scene, params: input texture (not the output filter->texture)
static void
gst_gl_filter_glass_callback (gpointer stuff)
{
  static gint64 start_time = 0;
  gfloat rotation;

  GstGLFilter *filter = GST_GL_FILTER (stuff);
  GstGLFilterGlass *glass_filter = GST_GL_FILTER_GLASS (stuff);
  GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;

  gint width = GST_VIDEO_INFO_WIDTH (&filter->out_info);
  gint height = GST_VIDEO_INFO_HEIGHT (&filter->out_info);
  guint texture = glass_filter->in_tex;

  if (start_time == 0)
    start_time = get_time ();
  else {
    gint64 time_left =
        (glass_filter->timestamp / 1000) - (get_time () - start_time);
    time_left -= 1000000 / 25;
    if (time_left > 2000) {
      GST_LOG ("escape");
      return;
    }
  }

  gst_gl_shader_use (glass_filter->passthrough_shader);

  gst_gl_filter_glass_draw_background_gradient (glass_filter);

  //Rotation
  if (start_time != 0) {
    gint64 time_passed = get_time () - start_time;
    rotation = sin (time_passed / 1200000.0) * 45.0f;
  } else {
    rotation = 0.0f;
  }

  gl->Enable (GL_BLEND);
  gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  gst_gl_shader_use (glass_filter->shader);

  //Reflection
  gst_gl_filter_glass_draw_video_plane (filter, width, height, texture,
      0.0f, 2.0f, 0.3f, 0.0f, TRUE, rotation);

  //Main video
  gst_gl_filter_glass_draw_video_plane (filter, width, height, texture,
      0.0f, 0.0f, 1.0f, 1.0f, FALSE, rotation);

  gst_gl_context_clear_shader (GST_GL_BASE_FILTER (filter)->context);

  gl->Disable (GL_BLEND);
}

static gboolean
_scene_geometry_draw (gpointer impl)
{
  struct GeometryScene *self = impl;
  g_return_val_if_fail (self->base.context, FALSE);

  GstGLFuncs *gl = self->base.context->gl_vtable;
  /*
     gst_gl_shader_use (self->shader->shader);
     gst_gl_shader_set_uniform_1f (self->shader->shader, "time",
     (gfloat) self->base.src->running_time / GST_SECOND);
   */

  gl->Enable (GL_DEPTH_TEST);
  gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  gst_3d_scene_draw (self->scene);
  gl->Disable (GL_DEPTH_TEST);

  return TRUE;
}

static void
gst_gl_effects_xray_sobel_length (gint width, gint height, guint texture,
    gpointer data)
{
  GstGLShader *shader;
  GstGLEffects *effects = GST_GL_EFFECTS (data);
  GstGLFilter *filter = GST_GL_FILTER (effects);
  GstGLContext *context = filter->context;
  GstGLFuncs *gl = context->gl_vtable;

  shader = g_hash_table_lookup (effects->shaderstable, "xray_sob_len");

  if (!shader) {
    shader = gst_gl_shader_new (context);
    g_hash_table_insert (effects->shaderstable, (gchar *) "xray_sob_len",
        shader);
  }

  if (!gst_gl_shader_compile_and_check (shader,
          sep_sobel_length_fragment_source, GST_GL_SHADER_FRAGMENT_SOURCE)) {
    gst_gl_context_set_error (context,
        "Failed to initialize seobel length shader");
    GST_ELEMENT_ERROR (effects, RESOURCE, NOT_FOUND,
        ("%s", gst_gl_context_get_error ()), (NULL));
    return;
  }

  gl->MatrixMode (GL_PROJECTION);
  gl->LoadIdentity ();

  gst_gl_shader_use (shader);

  gl->ActiveTexture (GL_TEXTURE1);
  gl->Enable (GL_TEXTURE_2D);
  gl->BindTexture (GL_TEXTURE_2D, texture);
  gl->Disable (GL_TEXTURE_2D);

  gst_gl_shader_set_uniform_1i (shader, "tex", 1);
  gst_gl_shader_set_uniform_1i (shader, "invert", TRUE);
  gst_gl_filter_draw_texture (filter, texture, width, height);
}

/* opengl scene, params: input texture (not the output mixer->texture) */
static void
gst_gl_video_mixer_callback (gpointer stuff)
{
  GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (stuff);
  GstVideoAggregator *vagg = GST_VIDEO_AGGREGATOR (stuff);
  GstGLMixer *mixer = GST_GL_MIXER (video_mixer);
  GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable;

  GLint attr_position_loc = 0;
  GLint attr_texture_loc = 0;
  guint out_width, out_height;

  guint count = 0;

  out_width = GST_VIDEO_INFO_WIDTH (&vagg->info);
  out_height = GST_VIDEO_INFO_HEIGHT (&vagg->info);

  gst_gl_context_clear_shader (GST_GL_BASE_MIXER (mixer)->context);
  gl->BindTexture (GL_TEXTURE_2D, 0);

  gl->Disable (GL_DEPTH_TEST);
  gl->Disable (GL_CULL_FACE);

  if (gl->GenVertexArrays) {
    if (!video_mixer->vao)
      gl->GenVertexArrays (1, &video_mixer->vao);
    gl->BindVertexArray (video_mixer->vao);
  }

  if (!_draw_background (video_mixer))
    return;

  gst_gl_shader_use (video_mixer->shader);

  attr_position_loc =
      gst_gl_shader_get_attribute_location (video_mixer->shader, "a_position");
  attr_texture_loc =
      gst_gl_shader_get_attribute_location (video_mixer->shader, "a_texCoord");

  gl->Enable (GL_BLEND);

  while (count < video_mixer->input_frames->len) {
    GstGLMixerFrameData *frame;
    GstGLVideoMixerPad *pad;
    GstVideoInfo *v_info;
    guint in_tex;
    guint in_width, in_height;

    /* *INDENT-OFF* */
    gfloat v_vertices[] = {
      -1.0,-1.0,-1.0f, 0.0f, 0.0f,
       1.0,-1.0,-1.0f, 1.0f, 0.0f,
       1.0, 1.0,-1.0f, 1.0f, 1.0f,
      -1.0, 1.0,-1.0f, 0.0f, 1.0f,
    };
    /* *INDENT-ON* */

    frame = g_ptr_array_index (video_mixer->input_frames, count);
    if (!frame) {
      GST_DEBUG ("skipping texture, null frame");
      count++;
      continue;
    }
    pad = (GstGLVideoMixerPad *) frame->pad;
    v_info = &GST_VIDEO_AGGREGATOR_PAD (pad)->info;
    in_width = GST_VIDEO_INFO_WIDTH (v_info);
    in_height = GST_VIDEO_INFO_HEIGHT (v_info);

    if (!frame->texture || in_width <= 0 || in_height <= 0
        || pad->alpha == 0.0f) {
      GST_DEBUG ("skipping texture:%u frame:%p width:%u height:%u alpha:%f",
          frame->texture, frame, in_width, in_height, pad->alpha);
      count++;
      continue;
    }

    in_tex = frame->texture;

    _init_vbo_indices (video_mixer);

    if (pad->geometry_change || !pad->vertex_buffer) {
      gint pad_width, pad_height;
      gfloat w, h;

      _mixer_pad_get_output_size (video_mixer, pad, &pad_width, &pad_height);

      w = ((gfloat) pad_width / (gfloat) out_width);
      h = ((gfloat) pad_height / (gfloat) out_height);

      /* top-left */
      v_vertices[0] = v_vertices[15] =
          2.0f * (gfloat) pad->xpos / (gfloat) out_width - 1.0f;
      /* bottom-left */
      v_vertices[1] = v_vertices[6] =
          2.0f * (gfloat) pad->ypos / (gfloat) out_height - 1.0f;
      /* top-right */
      v_vertices[5] = v_vertices[10] = v_vertices[0] + 2.0f * w;
      /* bottom-right */
      v_vertices[11] = v_vertices[16] = v_vertices[1] + 2.0f * h;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
      gst_gl_shader_get_attribute_location (mosaic->shader, "a_position");
  attr_texture_loc =
      gst_gl_shader_get_attribute_location (mosaic->shader, "a_texCoord");

  GST_OBJECT_LOCK (mosaic);
  walk = GST_ELEMENT (mosaic)->sinkpads;
  while (walk) {
    GstGLMixerPad *pad = walk->data;
    /* *INDENT-OFF* */
    gfloat v_vertices[] = {
      /* front face */
       1.0f, 1.0f,-1.0f, 1.0f, 0.0f,
       1.0f,-1.0f,-1.0f, 1.0f, 1.0f,
      -1.0f,-1.0f,-1.0f, 0.0f, 1.0f,
      -1.0f, 1.0f,-1.0f, 0.0f, 0.0f,
      /* right face */
       1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
       1.0f,-1.0f, 1.0f, 0.0f, 0.0f,
       1.0f,-1.0f,-1.0f, 0.0f, 1.0f,
       1.0f, 1.0f,-1.0f, 1.0f, 1.0f,
      /* left face */
      -1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
      -1.0f, 1.0f,-1.0f, 1.0f, 1.0f,
      -1.0f,-1.0f,-1.0f, 0.0f, 1.0f,
      -1.0f,-1.0f, 1.0f, 0.0f, 0.0f,
      /* top face */
       1.0f,-1.0f, 1.0f, 1.0f, 0.0f,
      -1.0f,-1.0f, 1.0f, 0.0f, 0.0f,
      -1.0f,-1.0f,-1.0f, 0.0f, 1.0f,
       1.0f,-1.0f,-1.0f, 1.0f, 1.0f,
      /* bottom face */
       1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
       1.0f, 1.0f,-1.0f, 1.0f, 1.0f,
      -1.0f, 1.0f,-1.0f, 0.0f, 1.0f,
      -1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
      /* back face */
       1.0f, 1.0f, 1.0f, 1.0f, 0.0f,
      -1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
      -1.0f,-1.0f, 1.0f, 0.0f, 1.0f,
       1.0f,-1.0f, 1.0f, 1.0f, 1.0f
    };
    /* *INDENT-ON* */
    guint in_tex;
    guint width, height;

    in_tex = pad->current_texture;
    width = GST_VIDEO_INFO_WIDTH (&GST_VIDEO_AGGREGATOR_PAD (pad)->info);
    height = GST_VIDEO_INFO_HEIGHT (&GST_VIDEO_AGGREGATOR_PAD (pad)->info);

    if (!in_tex || width <= 0 || height <= 0) {
      GST_DEBUG ("skipping texture:%u pad:%p width:%u height %u",
          in_tex, pad, width, height);
      count++;
      walk = g_list_next (walk);
      continue;
    }

    GST_TRACE ("processing texture:%u dimensions:%ux%u", in_tex, width, height);

    gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
        GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[5 * 4 * count]);

    gl->VertexAttribPointer (attr_texture_loc, 2, GL_FLOAT,
        GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[5 * 4 * count + 3]);

    gl->EnableVertexAttribArray (attr_position_loc);
    gl->EnableVertexAttribArray (attr_texture_loc);

    gl->ActiveTexture (GL_TEXTURE0);
    gl->BindTexture (GL_TEXTURE_2D, in_tex);
    gst_gl_shader_set_uniform_1i (mosaic->shader, "s_texture", 0);
    gst_gl_shader_set_uniform_1f (mosaic->shader, "xrot_degree", xrot);
    gst_gl_shader_set_uniform_1f (mosaic->shader, "yrot_degree", yrot);
    gst_gl_shader_set_uniform_1f (mosaic->shader, "zrot_degree", zrot);
    gst_gl_shader_set_uniform_matrix_4fv (mosaic->shader, "u_matrix", 1,
        GL_FALSE, matrix);

    gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);

    ++count;

    walk = g_list_next (walk);
  }
  GST_OBJECT_UNLOCK (mosaic);

  gl->DisableVertexAttribArray (attr_position_loc);
  gl->DisableVertexAttribArray (attr_texture_loc);

  gl->BindTexture (GL_TEXTURE_2D, 0);

  gl->Disable (GL_DEPTH_TEST);

  gst_gl_context_clear_shader (GST_GL_BASE_MIXER (mixer)->context);

  xrot += 0.6f;
  yrot += 0.4f;
  zrot += 0.8f;

  return TRUE;
}

//.........这里部分代码省略.........
     1.0,  1.0, -1.0, 1.0, 0.0,
     1.0, -1.0, -1.0, 1.0, 1.0,
    -1.0, -1.0, -1.0, 0.0, 1.0,
    -1.0,  1.0, -1.0, 0.0, 0.0,
    /* back face */
     1.0,  1.0,  1.0, 1.0, 0.0,
    -1.0,  1.0,  1.0, 0.0, 0.0,
    -1.0, -1.0,  1.0, 0.0, 1.0,
     1.0, -1.0,  1.0, 1.0, 1.0,
    /* right face */
     1.0,  1.0,  1.0, 1.0, 0.0,
     1.0, -1.0,  1.0, 0.0, 0.0,
     1.0, -1.0, -1.0, 0.0, 1.0,
     1.0,  1.0, -1.0, 1.0, 1.0,
    /* left face */
    -1.0,  1.0,  1.0, 1.0, 0.0,
    -1.0,  1.0, -1.0, 1.0, 1.0,
    -1.0, -1.0, -1.0, 0.0, 1.0,
    -1.0, -1.0,  1.0, 0.0, 0.0,
    /* top face */
     1.0, -1.0,  1.0, 1.0, 0.0,
    -1.0, -1.0,  1.0, 0.0, 0.0,
    -1.0, -1.0, -1.0, 0.0, 1.0,
     1.0, -1.0, -1.0, 1.0, 1.0,
    /* bottom face */
     1.0,  1.0,  1.0, 1.0, 0.0,
     1.0,  1.0, -1.0, 1.0, 1.0,
    -1.0,  1.0, -1.0, 0.0, 1.0,
    -1.0,  1.0,  1.0, 0.0, 0.0
  };
/* *INDENT-ON* */

  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
  };

  GLint attr_position_loc = 0;
  GLint attr_texture_loc = 0;

  const GLfloat matrix[] = {
    0.5f, 0.0f, 0.0f, 0.0f,
    0.0f, 0.5f, 0.0f, 0.0f,
    0.0f, 0.0f, 0.5f, 0.0f,
    0.0f, 0.0f, 0.0f, 1.0f
  };

  gl->Enable (GL_DEPTH_TEST);

  gl->ClearColor (cube_filter->red, cube_filter->green, cube_filter->blue, 0.0);
  gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  gst_gl_shader_use (cube_filter->shader);

  attr_position_loc =
      gst_gl_shader_get_attribute_location (cube_filter->shader, "a_position");
  attr_texture_loc =
      gst_gl_shader_get_attribute_location (cube_filter->shader, "a_texCoord");

  /* Load the vertex position */
  gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT,
      GL_FALSE, 5 * sizeof (GLfloat), v_vertices);

  /* Load the texture coordinate */
  gl->VertexAttribPointer (attr_texture_loc, 2, GL_FLOAT,
      GL_FALSE, 5 * sizeof (GLfloat), &v_vertices[3]);

  gl->EnableVertexAttribArray (attr_position_loc);
  gl->EnableVertexAttribArray (attr_texture_loc);

  gl->ActiveTexture (GL_TEXTURE0);
  gl->BindTexture (GL_TEXTURE_2D, texture);
  gst_gl_shader_set_uniform_1i (cube_filter->shader, "s_texture", 0);
  gst_gl_shader_set_uniform_1f (cube_filter->shader, "xrot_degree", xrot);
  gst_gl_shader_set_uniform_1f (cube_filter->shader, "yrot_degree", yrot);
  gst_gl_shader_set_uniform_1f (cube_filter->shader, "zrot_degree", zrot);
  gst_gl_shader_set_uniform_matrix_4fv (cube_filter->shader, "u_matrix", 1,
      GL_FALSE, matrix);

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

  gl->DisableVertexAttribArray (attr_position_loc);
  gl->DisableVertexAttribArray (attr_texture_loc);

  gl->Disable (GL_DEPTH_TEST);

  xrot += 0.3f;
  yrot += 0.2f;
  zrot += 0.4f;
}

static void
_callback_opengl (gint width, gint height, guint texture, gpointer stuff)
{
  GstGLFilterCube *cube_filter = GST_GL_FILTER_CUBE (stuff);
  GstGLFilter *filter = GST_GL_FILTER (stuff);
  GstGLFuncs *gl = filter->context->gl_vtable;

  static GLfloat xrot = 0;
  static GLfloat yrot = 0;
  static GLfloat zrot = 0;

/* *INDENT-OFF* */
  const GLfloat v_vertices[] = {
 /*|     Vertex     | TexCoord |*/ 
    /* front face */
     1.0,  1.0, -1.0, 0.0, 0.0,
     1.0, -1.0, -1.0, 1.0, 0.0,
    -1.0, -1.0, -1.0, 1.0, 1.0,
    -1.0,  1.0, -1.0, 0.0, 1.0,
    /* back face */
    -1.0,  1.0,  1.0, 0.0, 0.0,
    -1.0, -1.0,  1.0, 1.0, 0.0,
     1.0, -1.0,  1.0, 1.0, 1.0,
     1.0,  1.0,  1.0, 0.0, 1.0,
    /* right face */
    -1.0,  1.0, -1.0, 0.0, 0.0,
    -1.0, -1.0, -1.0, 1.0, 0.0,
    -1.0, -1.0,  1.0, 1.0, 1.0,
    -1.0,  1.0,  1.0, 0.0, 1.0,
    /* left face */
     1.0,  1.0,  1.0, 0.0, 0.0,
     1.0, -1.0,  1.0, 1.0, 0.0,
     1.0, -1.0, -1.0, 1.0, 1.0,
     1.0,  1.0, -1.0, 0.0, 1.0,
    /* top face */
     1.0,  1.0,  1.0, 0.0, 0.0,
     1.0,  1.0, -1.0, 1.0, 0.0,
    -1.0,  1.0, -1.0, 1.0, 1.0,
    -1.0,  1.0,  1.0, 0.0, 1.0,
    /* bottom face */
     1.0, -1.0,  1.0, 0.0, 0.0,
     1.0, -1.0, -1.0, 1.0, 0.0,
    -1.0, -1.0, -1.0, 1.0, 1.0,
    -1.0, -1.0,  1.0, 0.0, 1.0,
  };
/* *INDENT-ON* */

  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
  };

  gl->Enable (GL_DEPTH_TEST);

  gl->Enable (GL_TEXTURE_2D);
  gl->BindTexture (GL_TEXTURE_2D, texture);

  gl->ClearColor (cube_filter->red, cube_filter->green, cube_filter->blue, 0.0);
  gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  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);
  gl->LoadIdentity ();

//  gl->Translatef (0.0f, 0.0f, -5.0f);

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

  gl->VertexPointer (3, GL_FLOAT, 5 * sizeof (float), v_vertices);
  gl->TexCoordPointer (2, GL_FLOAT, 5 * sizeof (float), &v_vertices[3]);

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

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

  gl->Disable (GL_DEPTH_TEST);

  xrot += 0.3f;
  yrot += 0.2f;
  zrot += 0.4f;
}

void
gst_gl_effects_luma_to_curve (GstGLEffects * effects,
    GstGLEffectsCurve curve,
    gint curve_index, gint width, gint height, GLuint texture)
{
  GstGLShader *shader;
  GstGLFilter *filter = GST_GL_FILTER (effects);
  GstGLContext *context = filter->context;
  GstGLFuncs *gl = context->gl_vtable;

  shader = g_hash_table_lookup (effects->shaderstable, "lumamap0");

  if (!shader) {
    shader = gst_gl_shader_new (context);
    g_hash_table_insert (effects->shaderstable, "lumamap0", shader);
  }

  if (!gst_gl_shader_compile_and_check (shader,
          luma_to_curve_fragment_source, GST_GL_SHADER_FRAGMENT_SOURCE)) {
    gst_gl_context_set_error (context,
        "Failed to initialize luma to curve shader");
    GST_ELEMENT_ERROR (effects, RESOURCE, NOT_FOUND,
        ("%s", gst_gl_context_get_error ()), (NULL));
    return;
  }

  gl->MatrixMode (GL_PROJECTION);
  gl->LoadIdentity ();

  gst_gl_shader_use (shader);

  if (effects->curve[curve_index] == 0) {
    /* this parameters are needed to have a right, predictable, mapping */
    gl->GenTextures (1, &effects->curve[curve_index]);
    gl->Enable (GL_TEXTURE_1D);
    gl->BindTexture (GL_TEXTURE_1D, effects->curve[curve_index]);
    gl->TexParameteri (GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    gl->TexParameteri (GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    gl->TexParameteri (GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP);
    gl->TexParameteri (GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_CLAMP);

    gl->TexImage1D (GL_TEXTURE_1D, 0, curve.bytes_per_pixel,
        curve.width, 0, GL_RGB, GL_UNSIGNED_BYTE, curve.pixel_data);

    gl->Disable (GL_TEXTURE_1D);
  }

  gl->ActiveTexture (GL_TEXTURE2);
  gl->Enable (GL_TEXTURE_2D);
  gl->BindTexture (GL_TEXTURE_2D, texture);

  gst_gl_shader_set_uniform_1i (shader, "tex", 2);

  gl->Disable (GL_TEXTURE_2D);

  gl->ActiveTexture (GL_TEXTURE1);
  gl->Enable (GL_TEXTURE_1D);
  gl->BindTexture (GL_TEXTURE_1D, effects->curve[curve_index]);

  gst_gl_shader_set_uniform_1i (shader, "curve", 1);

  gl->Disable (GL_TEXTURE_1D);

  gst_gl_filter_draw_texture (filter, texture, width, height);
}

//.........这里部分代码省略.........
  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;
}

static gboolean
_callback (gpointer stuff)
{
  GstGLFilter *filter = GST_GL_FILTER (stuff);
  GstGLFilterCube *cube_filter = GST_GL_FILTER_CUBE (filter);
  GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;

  static GLfloat xrot = 0;
  static GLfloat yrot = 0;
  static GLfloat zrot = 0;

  const GLfloat matrix[] = {
    0.5f, 0.0f, 0.0f, 0.0f,
    0.0f, 0.5f, 0.0f, 0.0f,
    0.0f, 0.0f, 0.5f, 0.0f,
    0.0f, 0.0f, 0.0f, 1.0f
  };

  gl->Enable (GL_DEPTH_TEST);

  gl->ClearColor (cube_filter->red, cube_filter->green, cube_filter->blue, 0.0);
  gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  gst_gl_shader_use (cube_filter->shader);

  gl->ActiveTexture (GL_TEXTURE0);
  gl->BindTexture (GL_TEXTURE_2D, cube_filter->in_tex->tex_id);
  gst_gl_shader_set_uniform_1i (cube_filter->shader, "s_texture", 0);
  gst_gl_shader_set_uniform_1f (cube_filter->shader, "xrot_degree", xrot);
  gst_gl_shader_set_uniform_1f (cube_filter->shader, "yrot_degree", yrot);
  gst_gl_shader_set_uniform_1f (cube_filter->shader, "zrot_degree", zrot);
  gst_gl_shader_set_uniform_matrix_4fv (cube_filter->shader, "u_matrix", 1,
      GL_FALSE, matrix);

  if (!cube_filter->vertex_buffer) {
    if (gl->GenVertexArrays) {
      gl->GenVertexArrays (1, &cube_filter->vao);
      gl->BindVertexArray (cube_filter->vao);
    }

    gl->GenBuffers (1, &cube_filter->vertex_buffer);
    gl->BindBuffer (GL_ARRAY_BUFFER, cube_filter->vertex_buffer);
    gl->BufferData (GL_ARRAY_BUFFER, 6 * 4 * 5 * sizeof (GLfloat), vertices,
        GL_STATIC_DRAW);

    gl->GenBuffers (1, &cube_filter->vbo_indices);
    gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, cube_filter->vbo_indices);
    gl->BufferData (GL_ELEMENT_ARRAY_BUFFER, sizeof (indices), indices,
        GL_STATIC_DRAW);

    if (gl->GenVertexArrays) {
      _bind_buffer (cube_filter);
      gl->BindVertexArray (0);
    }

    gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0);
    gl->BindBuffer (GL_ARRAY_BUFFER, 0);
  }

  if (gl->GenVertexArrays)
    gl->BindVertexArray (cube_filter->vao);
  _bind_buffer (cube_filter);

  gl->DrawElements (GL_TRIANGLES, 36, GL_UNSIGNED_SHORT, 0);

  if (gl->GenVertexArrays)
    gl->BindVertexArray (0);
  _unbind_buffer (cube_filter);

  gl->Disable (GL_DEPTH_TEST);

  xrot += 0.3f;
  yrot += 0.2f;
  zrot += 0.4f;

  return TRUE;
}

void
gst_gl_test_src_shader (GstGLTestSrc * v, GstBuffer * buffer, int w, int h)
{

  GstGLFuncs *gl = v->context->gl_vtable;

/* *INDENT-OFF* */

  const GLfloat positions[] = {
     -1.0,  1.0,  0.0, 1.0,
      1.0,  1.0,  0.0, 1.0,
      1.0, -1.0,  0.0, 1.0,
     -1.0, -1.0,  0.0, 1.0,
  };

  const GLfloat identitiy_matrix[] = {
      1.0,  0.0,  0.0, 0.0,
      0.0,  1.0,  0.0, 0.0,
      0.0,  0.0,  1.0, 0.0,
      0.0,  0.0,  0.0, 1.0,
  };

  const GLfloat uvs[] = {
     0.0,  1.0,
     1.0,  1.0,
     1.0,  0.0,
     0.0,  0.0,
  };
/* *INDENT-ON* */

  GLushort indices[] = { 0, 1, 2, 3, 0 };

  GLint attr_position_loc = 0;
  GLint attr_uv_loc = 0;

  if (gst_gl_context_get_gl_api (v->context)) {

    gst_gl_context_clear_shader (v->context);
    gl->BindTexture (GL_TEXTURE_2D, 0);
    gl->Disable (GL_TEXTURE_2D);

    gst_gl_shader_use (v->shader);

    attr_position_loc =
        gst_gl_shader_get_attribute_location (v->shader, "position");

    attr_uv_loc = gst_gl_shader_get_attribute_location (v->shader, "uv");

    /* Load the vertex position */
    gl->VertexAttribPointer (attr_position_loc, 4, GL_FLOAT,
        GL_FALSE, 0, positions);
    /* Load the texture coordinate */
    gl->VertexAttribPointer (attr_uv_loc, 2, GL_FLOAT, GL_FALSE, 0, uvs);

    gl->EnableVertexAttribArray (attr_position_loc);
    gl->EnableVertexAttribArray (attr_uv_loc);

    gst_gl_shader_set_uniform_matrix_4fv (v->shader, "mvp",
        1, GL_FALSE, identitiy_matrix);

    gst_gl_shader_set_uniform_1f (v->shader, "time",
        (gfloat) v->running_time / GST_SECOND);

    gst_gl_shader_set_uniform_1f (v->shader, "aspect_ratio",
        (gfloat) w / (gfloat) h);

    gl->DrawElements (GL_TRIANGLE_STRIP, 5, GL_UNSIGNED_SHORT, indices);

    gl->DisableVertexAttribArray (attr_position_loc);
    gl->DisableVertexAttribArray (attr_uv_loc);

    gst_gl_context_clear_shader (v->context);
  }
}