src/gallium/auxiliary/sct/usage.c

   1 /* surface / context tracking */
   2
   3
   4 /*
   5
   6 context A:
   7   render to texture T
   8
   9 context B:
  10   texture from T
  11
  12 -----------------------
  13
  14 flush surface:
  15   which contexts are bound to the surface?
  16
  17 -----------------------
  18
  19 glTexSubImage():
  20   which contexts need to be flushed?
  21
  22  */
  23
  24
  25 /*
  26
  27 in MakeCurrent():
  28
  29   call sct_bind_surfaces(context, list of surfaces) to update the
  30   dependencies between context and surfaces
  31
  32
  33 in SurfaceFlush(), or whatever it is in D3D:
  34
  35   call sct_get_surface_contexts(surface) to get a list of contexts
  36   which are currently bound to the surface.
  37
  38
  39
  40 in BindTexture():
  41
  42   call sct_bind_texture(context, texture) to indicate that the texture
  43   is used in the scene.
  44
  45
  46 in glTexSubImage() or RenderToTexture():
  47
  48   call sct_is_texture_used(context, texture) to determine if the texture
  49   has been used in the scene, but the scene's not flushed.  If TRUE is
  50   returned it means the scene has to be rendered/flushed before the contents
  51   of the texture can be changed.
  52
  53
  54 in psb_scene_flush/terminate():
  55
  56   call sct_flush_textures(context) to tell the SCT that the textures which
  57   were used in the scene can be released.
  58
  59
  60
  61 */