Add RDNA4 (gfx12) support and a 0.1.2 optimization round

RDNA4 (experimental; untested on RDNA4 hardware)
- kernels/common/wmma_layout.h picks the WMMA operand/accumulator layout
  per target; K (pwin_*) and M (swin_*) index through it, so the same
  sources build for gfx11 and gfx12. D4R_WMMA_LAYOUT=12 on gfx11 is a test
  shim that runs the gfx12 indexing on gfx11 WMMA.

- M can use native e4m3 FP8 WMMA on gfx12 (D4R_NATIVE_FP8=1). Texture
  tails (enc0_tail, dec0_head) get gfx12 f16 and FP8 paths that match
  ZLUDA's gfx12 lowering.

- ZLUDA patch 0007: gfx12 WMMA helpers, optional native FP8 MMA
  (D4R_ZLUDA_WMMA_FP8_NATIVE), a layout override for testing, and an
  architecture argument for d4r_emit. Texture kernels are now compiled
  offline per target through d4r_emit (D4R_ZLUDA_EMIT) instead of on the
  local GPU.

- New d4r.ini option [Kernels] NativeFp8 (default on), wired through the
  shim and d4r_config.py. On gfx12 the bridge serves kernels/<arch>-fp8
  when it is on.

- The bridge picks the KFD GPU with the most SIMDs (so an iGPU is not
  chosen over a discrete GPU); D4R_GPU_ARCH overrides it.

- kernels/build.sh and package_release.sh build gfx1100-gfx1103 and
  gfx1200/gfx1201 (plus -fp8 variants), and D4R_BUNDLE_TEX takes
  per-target folders.

Performance (RDNA3; harness byte-identical unless noted)
- ZLUDA patch 0006: m16n8k8 f16 MMAs on WMMA (E; not bit-exact, 52-55 dB
  per layer, D4R_ZLUDA_WMMA_K8=0 disables it), per-key weight-image slots
  for native prep kernels (d4r_prep_key_at, d4r_prep_key_slots), and
  wave64 builds of MMA-free kernels (D4R_ZLUDA_WAVE64).

- M: packed FP8 encoding, conflict-free patch-merge reads, scalar weight
  loads in enc1, and weight prep once per weight set for the six enc3
  tube blocks.

- K: CU mode for the six non-wide pwin layers.

- Texture kernels: every DLSS flag variant is built natively (24 K output,
  8 M post, 4 M downsample, 4 M enc0), not only Townfall's; post and K
  output run as wave64.

- M direct output: rrlite_downsample_kernel writes the shim's output
  buffer; the shim's default direct-output presets are now 11,13.

Tools
- dump_runner takes the prep grid from d4r_prep_blocks and refuses
  texture/surface dumps.

- New pwin_check.py, swin_check.py, model_enc3.py and tail_check.hip.

Docs: README GPU table and RDNA4 notes, building (patches 0002-0007,
d4r_emit), native-kernels (RDNA4 section), performance (new numbers),
packaging README. Version 0.1.2.

tools/wine_nvcuda_bridge.c

@@ -389,11 +389,21 @@ static void native_cleanup(void)
         remove_directory(native_served);
 }
 
-/* The first GPU's gfx target from the KFD topology ("gfx1101"), "" when unknown. */
+/* The gfx target ("gfx1101") of the GPU DLSS runs on, "" when unknown: D4R_GPU_ARCH if set, else the KFD
+   topology's GPU with the most SIMDs. With an integrated and a discrete GPU (Ryzen 7000/9000 desktops) the
+   first KFD GPU node can be the integrated one, whose kernels would not match the discrete GPU. */
 static void gpu_architecture(char* out, size_t size)
 {
     out[0] = '\0';
-    for (int node = 0; node < 16 && out[0] == '\0'; ++node)
+    const char* forced = getenv("D4R_GPU_ARCH");
+    if (forced != NULL && strncmp(forced, "gfx", 3) == 0)
+    {
+        snprintf(out, size, "%s", forced);
+        return;
+    }
+    unsigned long best_simds = 0;
+    int gpus = 0;
+    for (int node = 0; node < 16; ++node)
     {
         char path[128];
         snprintf(path, sizeof(path), "/sys/class/kfd/kfd/topology/nodes/%d/properties", node);
@@ -408,9 +418,17 @@ static void gpu_architecture(char* out, size_t size)
             sscanf(line, "gfx_target_version %lu", &target);
         }
         fclose(properties);
-        if (simds != 0 && target != 0)
+        if (simds == 0 || target == 0)
+            continue;
+        ++gpus;
+        if (simds > best_simds)
+        {
+            best_simds = simds;
             snprintf(out, size, "gfx%lu%lu%lx", target / 10000, (target / 100) % 100, target % 100);
+        }
     }
+    if (gpus > 1)
+        tracef("native kernels: %d GPUs; using the one with the most SIMDs (%s); D4R_GPU_ARCH overrides", gpus, out);
 }
 
 static void prepare_native_kernels(const char* cache_home)
@@ -421,9 +439,22 @@ static void prepare_native_kernels(const char* cache_home)
     /* a release directory holds one manifest and set of code objects per GPU target */
     char architecture[32], source[1024], path[1200];
     gpu_architecture(architecture, sizeof(architecture));
-    snprintf(source, sizeof(source), "%s/%s", configured, architecture);
-    snprintf(path, sizeof(path), "%s/d4r-kernels.txt", source);
-    FILE* manifest = architecture[0] != '\0' ? fopen(path, "r") : NULL;
+    FILE* manifest = NULL;
+    /* RDNA4 with native FP8 WMMA (D4R_ZLUDA_WMMA_FP8_NATIVE=1, d4r.ini NativeFp8): the <target>-fp8 variant,
+       whose kernels match ZLUDA's FP8 lowering; no other GPU has such a directory */
+    const char* fp8 = getenv("D4R_ZLUDA_WMMA_FP8_NATIVE");
+    if (fp8 != NULL && strcmp(fp8, "1") == 0 && strncmp(architecture, "gfx12", 5) == 0)
+    {
+        snprintf(source, sizeof(source), "%s/%s-fp8", configured, architecture);
+        snprintf(path, sizeof(path), "%s/d4r-kernels.txt", source);
+        manifest = fopen(path, "r");
+    }
+    if (manifest == NULL)
+    {
+        snprintf(source, sizeof(source), "%s/%s", configured, architecture);
+        snprintf(path, sizeof(path), "%s/d4r-kernels.txt", source);
+        manifest = architecture[0] != '\0' ? fopen(path, "r") : NULL;
+    }
     if (manifest == NULL)
     {
         snprintf(source, sizeof(source), "%s", configured);
@@ -679,7 +710,7 @@ static void verify_native_kernels(const void* image)
     pthread_mutex_unlock(&native_lock);
 }
 
-/* DLSS's output kernels (hiluma_engine_output_*): NGX looks up every variant, then launches the one
+/* DLSS's output kernels (hiluma_engine_output_*, rrlite_downsample_kernel_*): NGX looks up every variant, then launches the one
    matching the feature's flags. The shim's direct output relies on stores that only d4r's native
    output kernel makes, so it asks whether the last output kernel launched was native (a file in
    D4R_ZLUDA_NATIVE_DIR, which is the verified per-process directory in a portable install). */
@@ -694,7 +725,9 @@ static int last_output_native = -1;
 
 static void note_function_lookup(CUfunction function, const char* name)
 {
-    if (name == NULL || strncmp(name, "hiluma_engine_output", 20) != 0)
+    /* DLSS 4 writes its result with hiluma_engine_output_*, DLSS 4.5 (rrlite) with its final
+       rrlite_downsample_kernel_* (the post kernel works at a larger internal resolution) */
+    if (name == NULL || (strncmp(name, "hiluma_engine_output", 20) != 0 && strncmp(name, "rrlite_downsample_kernel", 24) != 0))
         return;
     const char* directory = getenv("D4R_ZLUDA_NATIVE_DIR");
     int native = 0;