retrace: support for dumping multiple snapshots (v3)

Usually if an app is using MRT, we want to dump (and diff) *all* the
render targets to track down where things are going wrong.  Also dumps
depth and stencil buffers.

When the --mrt (or -m) argument is specified, all render targets plus
depth and/or stencil are dumped, with the suffix -mrtN/-z/-s.  Otherwise
the behavior is as before, only mrt0 is dumped with no suffix.

Only implemented for GLDumper, since I don't know anything about D3D.

1 files changed, 7 insertions, 2 deletions

diff --git a/retrace/d3dretrace.hpp b/retrace/d3dretrace.hpp
index d0be5773..d5fc848f 100644
--- a/retrace/d3dretrace.hpp
+++ b/retrace/d3dretrace.hpp
@@ -50,9 +50,14 @@ public:
         pLastDevice(NULL)
     {}
 
+    int
+    getSnapshotCount(void) override {
+        return 1;
+    }
+
     image::Image *
-    getSnapshot(void) {
-        if (!pLastDevice) {
+    getSnapshot(int n) {
+        if ((n != 0) || !pLastDevice) {
             return NULL;
         }
         return d3dstate::getRenderTargetImage(pLastDevice);