# HG changeset patch
# User Mike Gorchak <lestat@i.com.ua>
# Date 1258784270 0
# Node ID 8c5fb2a3b11de2a9b13148f4006cb95f715748db
# Parent  789b97008d8ad3b4c2b9a47dcba3b6f2121de78b
RenderReadPixels and RenderWritePixels functions work with back buffer now and all asynchronous operations are flushed before reading or writing to backbuffer. Thanks Sam for clarification of this.

diff -r 789b97008d8a -r 8c5fb2a3b11d src/video/photon/SDL_photon_render.c
--- a/src/video/photon/SDL_photon_render.c	Sat Nov 21 05:29:31 2009 +0000
+++ b/src/video/photon/SDL_photon_render.c	Sat Nov 21 06:17:50 2009 +0000
@@ -1594,17 +1594,32 @@
     uint8_t* spixels=NULL;
     unsigned int spitch=0;
 
+    /* Flush all undrawn graphics data to surface */
     switch (rdata->surfaces_type)
     {
         case SDL_PHOTON_SURFTYPE_OFFSCREEN:
-             sformat=photon_image_to_sdl_pixelformat(rdata->osurfaces[rdata->surface_visible_idx]->format);
-             spixels=(uint8_t*)PdGetOffscreenContextPtr(rdata->osurfaces[rdata->surface_visible_idx]);
-             spitch=rdata->osurfaces[rdata->surface_visible_idx]->pitch;
+             PgFlushCx(rdata->osurfaces[rdata->surface_render_idx]);
+             PgWaitHWIdle();
              break;
         case SDL_PHOTON_SURFTYPE_PHIMAGE:
-             sformat=photon_image_to_sdl_pixelformat(rdata->psurfaces[rdata->surface_visible_idx]->type);
-             spixels=(uint8_t*)rdata->psurfaces[rdata->surface_visible_idx]->image;
-             spitch=rdata->psurfaces[rdata->surface_visible_idx]->bpl;
+             PmMemFlush(rdata->pcontexts[rdata->surface_render_idx], rdata->psurfaces[rdata->surface_render_idx]);
+             break;
+        case SDL_PHOTON_SURFTYPE_UNKNOWN:
+        default:
+             return;
+    }
+
+    switch (rdata->surfaces_type)
+    {
+        case SDL_PHOTON_SURFTYPE_OFFSCREEN:
+             sformat=photon_image_to_sdl_pixelformat(rdata->osurfaces[rdata->surface_render_idx]->format);
+             spixels=(uint8_t*)PdGetOffscreenContextPtr(rdata->osurfaces[rdata->surface_render_idx]);
+             spitch=rdata->osurfaces[rdata->surface_render_idx]->pitch;
+             break;
+        case SDL_PHOTON_SURFTYPE_PHIMAGE:
+             sformat=photon_image_to_sdl_pixelformat(rdata->psurfaces[rdata->surface_render_idx]->type);
+             spixels=(uint8_t*)rdata->psurfaces[rdata->surface_render_idx]->image;
+             spitch=rdata->psurfaces[rdata->surface_render_idx]->bpl;
              break;
         case SDL_PHOTON_SURFTYPE_UNKNOWN:
         default:
@@ -1631,17 +1646,32 @@
     uint8_t* spixels=NULL;
     unsigned int spitch=0;
 
+    /* Flush all undrawn graphics data to surface */
     switch (rdata->surfaces_type)
     {
         case SDL_PHOTON_SURFTYPE_OFFSCREEN:
-             sformat=photon_image_to_sdl_pixelformat(rdata->osurfaces[rdata->surface_visible_idx]->format);
-             spixels=(uint8_t*)PdGetOffscreenContextPtr(rdata->osurfaces[rdata->surface_visible_idx]);
-             spitch=rdata->osurfaces[rdata->surface_visible_idx]->pitch;
+             PgFlushCx(rdata->osurfaces[rdata->surface_render_idx]);
+             PgWaitHWIdle();
              break;
         case SDL_PHOTON_SURFTYPE_PHIMAGE:
-             sformat=photon_image_to_sdl_pixelformat(rdata->psurfaces[rdata->surface_visible_idx]->type);
-             spixels=(uint8_t*)rdata->psurfaces[rdata->surface_visible_idx]->image;
-             spitch=rdata->psurfaces[rdata->surface_visible_idx]->bpl;
+             PmMemFlush(rdata->pcontexts[rdata->surface_render_idx], rdata->psurfaces[rdata->surface_render_idx]);
+             break;
+        case SDL_PHOTON_SURFTYPE_UNKNOWN:
+        default:
+             return;
+    }
+
+    switch (rdata->surfaces_type)
+    {
+        case SDL_PHOTON_SURFTYPE_OFFSCREEN:
+             sformat=photon_image_to_sdl_pixelformat(rdata->osurfaces[rdata->surface_render_idx]->format);
+             spixels=(uint8_t*)PdGetOffscreenContextPtr(rdata->osurfaces[rdata->surface_render_idx]);
+             spitch=rdata->osurfaces[rdata->surface_render_idx]->pitch;
+             break;
+        case SDL_PHOTON_SURFTYPE_PHIMAGE:
+             sformat=photon_image_to_sdl_pixelformat(rdata->psurfaces[rdata->surface_render_idx]->type);
+             spixels=(uint8_t*)rdata->psurfaces[rdata->surface_render_idx]->image;
+             spitch=rdata->psurfaces[rdata->surface_render_idx]->bpl;
              break;
         case SDL_PHOTON_SURFTYPE_UNKNOWN:
         default: