Exemple #1
0
void Background::draw()
{
    _shader_program->use_program();
    _update_uniforms();
    
    glBindBuffer(GL_ARRAY_BUFFER, _vertex_buffer);
    glVertexAttribPointer(VERTEX_ATTRIB_POSITION, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
Exemple #2
0
static GstGLShader *
_maybe_recompile_shader (GstGLFilterShader * filtershader)
{
  GstGLContext *context = GST_GL_BASE_FILTER (filtershader)->context;
  GstGLShader *shader;
  GError *error = NULL;

  GST_OBJECT_LOCK (filtershader);

  if (!filtershader->shader || filtershader->update_shader) {
    filtershader->update_shader = FALSE;
    GST_OBJECT_UNLOCK (filtershader);
    g_signal_emit (filtershader, gst_gl_shader_signals[SIGNAL_CREATE_SHADER], 0,
        &shader);
    GST_OBJECT_LOCK (filtershader);

    if (shader) {
      if (filtershader->shader)
        gst_object_unref (filtershader->shader);
      filtershader->new_source = FALSE;
      filtershader->shader = gst_object_ref (shader);
      filtershader->new_uniforms = TRUE;
      _update_uniforms (filtershader);
      GST_OBJECT_UNLOCK (filtershader);
      return shader;
    }
  }

  if (filtershader->shader) {
    shader = gst_object_ref (filtershader->shader);
    _update_uniforms (filtershader);
    GST_OBJECT_UNLOCK (filtershader);
    return shader;
  }

  if (filtershader->new_source) {
    GstGLSLStage *stage;

    shader = gst_gl_shader_new (context);

    if (filtershader->vertex) {
      if (!(stage = gst_glsl_stage_new_with_string (context, GL_VERTEX_SHADER,
                  GST_GLSL_VERSION_NONE, GST_GLSL_PROFILE_NONE,
                  filtershader->vertex))) {
        g_set_error (&error, GST_GLSL_ERROR, GST_GLSL_ERROR_COMPILE,
            "Failed to create shader vertex stage");
        goto print_error;
      }
    } else {
      stage = gst_glsl_stage_new_default_vertex (context);
    }

    if (!gst_gl_shader_compile_attach_stage (shader, stage, &error)) {
      gst_object_unref (stage);
      goto print_error;
    }

    if (filtershader->fragment) {
      if (!(stage = gst_glsl_stage_new_with_string (context, GL_FRAGMENT_SHADER,
                  GST_GLSL_VERSION_NONE, GST_GLSL_PROFILE_NONE,
                  filtershader->fragment))) {
        g_set_error (&error, GST_GLSL_ERROR, GST_GLSL_ERROR_COMPILE,
            "Failed to create shader fragment stage");
        goto print_error;
      }
    } else {
      stage = gst_glsl_stage_new_default_fragment (context);
    }

    if (!gst_gl_shader_compile_attach_stage (shader, stage, &error)) {
      gst_object_unref (stage);
      goto print_error;
    }

    if (!gst_gl_shader_link (shader, &error)) {
      goto print_error;
    }
    if (filtershader->shader)
      gst_object_unref (filtershader->shader);
    filtershader->shader = gst_object_ref (shader);
    filtershader->new_source = FALSE;
    filtershader->new_uniforms = TRUE;
    _update_uniforms (filtershader);

    GST_OBJECT_UNLOCK (filtershader);
    return shader;
  } else if (filtershader->shader) {
    _update_uniforms (filtershader);
    shader = gst_object_ref (filtershader->shader);
    GST_OBJECT_UNLOCK (filtershader);
    return shader;
  }

  return NULL;

print_error:
  if (shader) {
    gst_object_unref (shader);
    shader = NULL;
  }

  GST_OBJECT_UNLOCK (filtershader);
  GST_ELEMENT_ERROR (filtershader, RESOURCE, NOT_FOUND,
      ("%s", error->message), (NULL));
  return NULL;
}