access barrier batching

src/gpu/gpu_core.h

@@ -165,9 +165,10 @@ Enum(GPU_Format)
 
 Enum(GPU_AccessKind)
 {
+    GPU_AccessKind_None,
+
     GPU_AccessKind_AnyRead,
 
-    GPU_AccessKind_AnyReadWrite,
 
     GPU_AccessKind_CopyRead,
     GPU_AccessKind_CopyWrite,
@@ -205,7 +206,6 @@ Struct(GPU_BufferDesc)
 {
     u64 size;
     GPU_BufferFlag flags;
-    GPU_AccessKind initial_access;
 };
 
 ////////////////////////////////////////////////////////////
@@ -386,7 +386,6 @@ GPU_ResourceHandle GPU_PushSampler(GPU_ArenaHandle arena, GPU_SamplerDesc desc);
 
 #define GPU_PushBuffer(arena, type, count, ...) GPU_PushBufferEx((arena), \
     (GPU_BufferDesc) {                                                    \
-        .initial_access = GPU_AccessKind_AnyReadWrite,                    \
         .size = sizeof(type) * (count),                                   \
         __VA_ARGS__                                                       \
     }                                                                     \

src/gpu/gpu_dx12/gpu_dx12.h

@@ -116,6 +116,7 @@ Struct(GPU_D12_Resource)
 {
     GPU_D12_Resource *next_free;
     ID3D12Resource *d3d_resource;
+    u64 uid;
 
     /* Buffer info */
     GPU_BufferDesc buffer_desc;
@@ -198,12 +199,18 @@ Enum(GPU_D12_CmdKind)
 Struct(GPU_D12_Cmd)
 {
     GPU_D12_CmdKind kind;
+    b32 skip;
     union
     {
         struct
         {
-            GPU_AccessKind kind;
+            GPU_AccessKind after;
             GPU_D12_Resource *resource;
+
+            /* Post-batch data */
+            b32 is_end_of_batch;
+            u64 batch_gen;
+            GPU_AccessKind before;
         } access;
 
         struct
@@ -298,7 +305,7 @@ Struct(GPU_D12_Swapchain)
 
 Struct(GPU_D12_SharedState)
 {
-    Atomic64Padded resource_barrier_gen;
+    Atomic64Padded next_resource_uid;
 
     /* Stats */
     Atomic64 driver_resources_allocated;