C++ (Cpp) _cogl_matrix_stack_flush_to_gl Examples

Example #1

File: cogl-pipeline-vertend-glsl.c Project: spatulasnout/cogl

static gboolean
_cogl_pipeline_vertend_glsl_add_layer (CoglPipeline *pipeline,
                                       CoglPipelineLayer *layer,
                                       unsigned long layers_difference)
{
  CoglPipelineShaderState *shader_state;
  int unit_index;

  _COGL_GET_CONTEXT (ctx, FALSE);

  shader_state = get_shader_state (pipeline);

  unit_index = _cogl_pipeline_layer_get_unit_index (layer);

  if (ctx->driver != COGL_DRIVER_GLES2)
    {
      /* We are using the fixed function uniforms for the user matrices
         and the only way to set them is with the fixed function API so we
         still need to flush them here */
      if (layers_difference & COGL_PIPELINE_LAYER_STATE_USER_MATRIX)
        {
          CoglPipelineLayerState state = COGL_PIPELINE_LAYER_STATE_USER_MATRIX;
          CoglPipelineLayer *authority =
            _cogl_pipeline_layer_get_authority (layer, state);
          CoglTextureUnit *unit = _cogl_get_texture_unit (unit_index);

          _cogl_matrix_stack_set (unit->matrix_stack,
                                  &authority->big_state->matrix);

          _cogl_set_active_texture_unit (unit_index);

          _cogl_matrix_stack_flush_to_gl (unit->matrix_stack,
                                          COGL_MATRIX_TEXTURE);
        }
    }

  if (shader_state->source == NULL)
    return TRUE;

  /* Transform the texture coordinates by the layer's user matrix.
   *
   * FIXME: this should avoid doing the transform if there is no user
   * matrix set. This might need a separate layer state flag for
   * whether there is a user matrix
   *
   * FIXME: we could be more clever here and try to detect if the
   * fragment program is going to use the texture coordinates and
   * avoid setting them if not
   */

  g_string_append_printf (shader_state->source,
                          "  cogl_tex_coord_out[%i] = "
                          "cogl_texture_matrix[%i] * cogl_tex_coord%i_in;\n",
                          unit_index, unit_index, unit_index);

  return TRUE;
}

Example #2

File: cogl-clip-stack.c Project: gramozeka/GSB-NEW

static void
set_clip_plane (GLint plane_num,
		const float *vertex_a,
		const float *vertex_b)
{
#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
  GLfloat plane[4];
#else
  GLdouble plane[4];
#endif
  GLfloat angle;
  CoglHandle framebuffer = _cogl_get_framebuffer ();
  CoglMatrixStack *modelview_stack =
    _cogl_framebuffer_get_modelview_stack (framebuffer);
  CoglMatrixStack *projection_stack =
    _cogl_framebuffer_get_projection_stack (framebuffer);
  CoglMatrix inverse_projection;

  _COGL_GET_CONTEXT (ctx, NO_RETVAL);

  _cogl_matrix_stack_get_inverse (projection_stack, &inverse_projection);

  /* Calculate the angle between the axes and the line crossing the
     two points */
  angle = atan2f (vertex_b[1] - vertex_a[1],
                  vertex_b[0] - vertex_a[0]) * (180.0/G_PI);

  _cogl_matrix_stack_push (modelview_stack);

  /* Load the inverse of the projection matrix so we can specify the plane
   * in screen coordinates */
  _cogl_matrix_stack_set (modelview_stack, &inverse_projection);

  /* Rotate about point a */
  _cogl_matrix_stack_translate (modelview_stack,
                                vertex_a[0], vertex_a[1], vertex_a[2]);
  /* Rotate the plane by the calculated angle so that it will connect
     the two points */
  _cogl_matrix_stack_rotate (modelview_stack, angle, 0.0f, 0.0f, 1.0f);
  _cogl_matrix_stack_translate (modelview_stack,
                                -vertex_a[0], -vertex_a[1], -vertex_a[2]);

  _cogl_matrix_stack_flush_to_gl (modelview_stack, COGL_MATRIX_MODELVIEW);

  plane[0] = 0;
  plane[1] = -1.0;
  plane[2] = 0;
  plane[3] = vertex_a[1];
#if defined (HAVE_COGL_GLES2) || defined (HAVE_COGL_GLES)
  GE( glClipPlanef (plane_num, plane) );
#else
  GE( glClipPlane (plane_num, plane) );
#endif

  _cogl_matrix_stack_pop (modelview_stack);
}