C++ GstGLFuncs::LoadIdentity方法代码示例

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

  shader = gst_gl_effects_get_fragment_shader (effects, "twirl",
      twirl_fragment_source_gles2);

  if (!shader)
    return;

#if GST_GL_HAVE_OPENGL
  if (USING_OPENGL (context)) {
    gl->MatrixMode (GL_PROJECTION);
    gl->LoadIdentity ();
  }
#endif

  gst_gl_shader_use (shader);

  gl->ActiveTexture (GL_TEXTURE0);
  gl->BindTexture (GL_TEXTURE_2D, texture);

  gst_gl_shader_set_uniform_1i (shader, "tex", 0);

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

static void
gst_gl_differencematte_diff (gint width, gint height, guint texture,
    gpointer stuff)
{
  GstGLDifferenceMatte *differencematte = GST_GL_DIFFERENCEMATTE (stuff);
  GstGLFilter *filter = GST_GL_FILTER (stuff);
  GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;

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

  gst_gl_shader_use (differencematte->shader[0]);

  gl->ActiveTexture (GL_TEXTURE0);
  gl->BindTexture (GL_TEXTURE_2D, texture);

  gst_gl_shader_set_uniform_1i (differencematte->shader[0], "current", 0);

  gl->ActiveTexture (GL_TEXTURE1);
  gl->BindTexture (GL_TEXTURE_2D, differencematte->savedbgtexture);

  gst_gl_shader_set_uniform_1i (differencematte->shader[0], "saved", 1);

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

static void
gst_gl_effects_sobel_callback_vconv (gint width, gint height, guint texture,
    gpointer data)
{
  GstGLShader *shader = NULL;
  GstGLEffects *effects = GST_GL_EFFECTS (data);
  GstGLFilter *filter = GST_GL_FILTER (effects);

  if (NULL != (shader = gst_gl_effects_get_fragment_shader (effects, "vconv0",
              sep_sobel_vconv3_fragment_source_gles2,
              sep_sobel_vconv3_fragment_source_opengl))) {
    GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;

#if GST_GL_HAVE_OPENGL
    if (USING_OPENGL (GST_GL_BASE_FILTER (filter)->context)) {
      gl->MatrixMode (GL_PROJECTION);
      gl->LoadIdentity ();
    }
#endif

    gst_gl_shader_use (shader);

    gl->ActiveTexture (GL_TEXTURE0);
    gl->BindTexture (GL_TEXTURE_2D, texture);

    gst_gl_shader_set_uniform_1i (shader, "tex", 0);
    gst_gl_shader_set_uniform_1f (shader, "height", height);

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

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

  shader = g_hash_table_lookup (effects->shaderstable, "squeeze0");

  if (!shader) {
    shader = gst_gl_shader_new (context);
    g_hash_table_insert (effects->shaderstable, (gchar *) "squeeze0", shader);

    if (USING_GLES2 (context) || USING_OPENGL3 (context)) {
      if (!gst_gl_shader_compile_with_default_v_and_check (shader,
              squeeze_fragment_source_gles2, &filter->draw_attr_position_loc,
              &filter->draw_attr_texture_loc)) {
        /* gst gl context error is already set */
        GST_ELEMENT_ERROR (effects, RESOURCE, NOT_FOUND,
            ("Failed to initialize squeeze shader, %s",
                gst_gl_context_get_error ()), (NULL));
        return;
      }
    }
#if GST_GL_HAVE_OPENGL
    if (USING_OPENGL (context)) {
      if (!gst_gl_shader_compile_and_check (shader,
              squeeze_fragment_source_opengl, GST_GL_SHADER_FRAGMENT_SOURCE)) {
        gst_gl_context_set_error (context,
            "Failed to initialize squeeze shader");
        GST_ELEMENT_ERROR (effects, RESOURCE, NOT_FOUND,
            ("%s", gst_gl_context_get_error ()), (NULL));
        return;
      }
    }
#endif
  }
#if GST_GL_HAVE_OPENGL
  if (USING_OPENGL (context)) {
    gl->MatrixMode (GL_PROJECTION);
    gl->LoadIdentity ();
  }
#endif

  gst_gl_shader_use (shader);

  gl->ActiveTexture (GL_TEXTURE0);
  if (USING_OPENGL (context))
    gl->Enable (GL_TEXTURE_2D);
  gl->BindTexture (GL_TEXTURE_2D, texture);

  gst_gl_shader_set_uniform_1i (shader, "tex", 0);

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

static gboolean
gst_gl_deinterlace_greedyh_callback (GstGLFilter * filter, GstGLMemory * in_tex,
    gpointer user_data)
{
  GstGLShader *shader;
  GstGLDeinterlace *deinterlace_filter = GST_GL_DEINTERLACE (filter);
  GstGLContext *context = GST_GL_BASE_FILTER (filter)->context;
  GstGLFuncs *gl = context->gl_vtable;

  shader =
      gst_gl_deinterlace_get_fragment_shader (filter, "greedhy",
      greedyh_fragment_source);

  if (!shader)
    return FALSE;

#if GST_GL_HAVE_OPENGL
  if (USING_OPENGL (context)) {
    gl->MatrixMode (GL_PROJECTION);
    gl->LoadIdentity ();
  }
#endif

  gst_gl_shader_use (shader);

  if (G_LIKELY (deinterlace_filter->prev_tex != NULL)) {
    gl->ActiveTexture (GL_TEXTURE1);
    gst_gl_shader_set_uniform_1i (shader, "tex_prev", 1);
    gl->BindTexture (GL_TEXTURE_2D,
        gst_gl_memory_get_texture_id (deinterlace_filter->prev_tex));
  }

  gl->ActiveTexture (GL_TEXTURE0);
  gl->BindTexture (GL_TEXTURE_2D, gst_gl_memory_get_texture_id (in_tex));

  gst_gl_shader_set_uniform_1i (shader, "tex", 0);
  gst_gl_shader_set_uniform_1f (shader, "max_comb", 5.0f / 255.0f);
  gst_gl_shader_set_uniform_1f (shader, "motion_threshold", 25.0f / 255.0f);
  gst_gl_shader_set_uniform_1f (shader, "motion_sense", 30.0f / 255.0f);

  gst_gl_shader_set_uniform_1f (shader, "width",
      GST_VIDEO_INFO_WIDTH (&filter->out_info));
  gst_gl_shader_set_uniform_1f (shader, "height",
      GST_VIDEO_INFO_HEIGHT (&filter->out_info));

  gst_gl_filter_draw_fullscreen_quad (filter);

  /* we keep the previous buffer around so this is safe */
  deinterlace_filter->prev_tex = in_tex;

  return TRUE;
}

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);
}

static void
gst_gl_effects_square_callback (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, "square0");

  if (!shader) {
    shader = gst_gl_shader_new (context);
    g_hash_table_insert (effects->shaderstable, "square0", shader);
  }

  if (!gst_gl_shader_compile_and_check (shader,
          square_fragment_source, GST_GL_SHADER_FRAGMENT_SOURCE)) {
    gst_gl_context_set_error (context, "Failed to initialize square 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_TEXTURE0);
  gl->Enable (GL_TEXTURE_2D);
  gl->BindTexture (GL_TEXTURE_2D, texture);

  gst_gl_shader_set_uniform_1i (shader, "tex", 0);

  gst_gl_shader_set_uniform_1f (shader, "width", (gfloat) width / 2.0f);
  gst_gl_shader_set_uniform_1f (shader, "height", (gfloat) height / 2.0f);

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

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);
}

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

#if GST_GL_HAVE_OPENGL
  if (gst_gl_context_get_gl_api (filter->context) & GST_GL_API_OPENGL) {
    gl->MatrixMode (GL_PROJECTION);
    gl->LoadIdentity ();
  }
#endif

  gst_gl_shader_use (filter->default_shader);

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

  gst_gl_shader_set_uniform_1i (filter->default_shader, "tex", 1);
  gst_gl_shader_set_uniform_1f (filter->default_shader, "width", width);
  gst_gl_shader_set_uniform_1f (filter->default_shader, "height", height);

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

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);
}

//opengl scene, params: input texture (not the output filter->texture)
static void
gst_gl_deinterlace_callback (gint width, gint height, guint texture,
    gpointer stuff)
{
  GstGLDeinterlace *deinterlace_filter = GST_GL_DEINTERLACE (stuff);
  GstGLFilter *filter = GST_GL_FILTER (stuff);
  GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
  guint temp;

  GLfloat verts[] = { -1.0, -1.0,
    1.0, -1.0,
    1.0, 1.0,
    -1.0, 1.0
  };
  GLfloat texcoords0[] = { 0.0f, 0.0f,
    1.0f, 0.0f,
    1.0f, 1.0f,
    0.0f, 1.0f
  };
  GLfloat texcoords1[] = { 0.0f, 0.0f,
    1.0f, 0.0f,
    1.0f, 1.0f,
    0.0f, 1.0f
  };

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

  gst_gl_shader_use (deinterlace_filter->shader);

  if (G_UNLIKELY (deinterlace_filter->prev_tex == 0)) {
    gst_gl_context_gen_texture (GST_GL_BASE_FILTER (filter)->context,
        &deinterlace_filter->prev_tex,
        GST_VIDEO_INFO_FORMAT (&filter->out_info),
        GST_VIDEO_INFO_WIDTH (&filter->out_info),
        GST_VIDEO_INFO_HEIGHT (&filter->out_info));
  } else {
    gl->ActiveTexture (GL_TEXTURE1);
    gst_gl_shader_set_uniform_1i (deinterlace_filter->shader, "tex_prev", 1);
    gl->BindTexture (GL_TEXTURE_2D, deinterlace_filter->prev_tex);
  }

  gl->ActiveTexture (GL_TEXTURE0);
  gst_gl_shader_set_uniform_1i (deinterlace_filter->shader, "tex", 0);

  gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "max_comb",
      5.0f / 255.0f);
  gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "motion_threshold",
      25.0f / 255.0f);
  gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "motion_sense",
      30.0f / 255.0f);

  gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "width",
      GST_VIDEO_INFO_WIDTH (&filter->out_info));
  gst_gl_shader_set_uniform_1f (deinterlace_filter->shader, "height",
      GST_VIDEO_INFO_HEIGHT (&filter->out_info));

  gl->ClientActiveTexture (GL_TEXTURE0);

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

  gl->VertexPointer (2, GL_FLOAT, 0, &verts);
  gl->TexCoordPointer (2, GL_FLOAT, 0, &texcoords0);

  gl->ClientActiveTexture (GL_TEXTURE1);
  gl->EnableClientState (GL_TEXTURE_COORD_ARRAY);
  gl->TexCoordPointer (2, GL_FLOAT, 0, &texcoords1);

  gl->DrawArrays (GL_TRIANGLE_FAN, 0, 4);

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

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

  if (texture == filter->in_tex_id) {
    temp = filter->in_tex_id;
    filter->in_tex_id = deinterlace_filter->prev_tex;
    deinterlace_filter->prev_tex = temp;
  } else {
    deinterlace_filter->prev_tex = texture;
  }
}