nx2: capture and lower native shader programs once

Native programs were captured and lowered when their ShaderInfo was
made and again for every environment built for their pipelines. The
ShaderInfo now keeps the lowered code and the environments adopt it.
Capture also reads a 4 KiB page at a time instead of flushing caches per
instruction, and cached native programs fold bank 1 reads like live ones.

Ported from Wael3rd/Eglantine-MKW (0ae093058e, 65a6aa877a, df076133c4).

Assisted-by: Claude Sonnet 5.5 (porting the fixes)
(cherry picked from commit 3af11ac401ad3061c183281d8c98c16c1d6da456)

1 files changed, 5 insertions, 2 deletions

diff --git a/src/video_core/shader_cache.cpp b/src/video_core/shader_cache.cpp
index f03df6bac5..5faed0dba9 100644
--- a/src/video_core/shader_cache.cpp
+++ b/src/video_core/shader_cache.cpp
@@ -112,7 +112,8 @@ bool ShaderCache::RefreshStages(std::array<u64, 6>& unique_hashes) try {
         if (!shader_info) {
             const u32 start_address{native ? 0 : shader_config.offset};
             try {
-                // Native programs are lowered while the environment is built.
+                // Native programs are lowered while the environment is built (once: the
+                // ShaderInfo keeps the result for the pipeline's environments).
                 RethrowIfRejected(*cpu_shader_addr);
                 GraphicsEnvironment env{*maxwell3d, *gpu_memory, program, native ? shader_addr : base_addr, start_address};
                 shader_info = MakeShaderInfo(env, *cpu_shader_addr);
@@ -229,7 +230,8 @@ void ShaderCache::GetGraphicsEnvironments(GraphicsEnvironments& result,
         const GPUVAddr address = native
             ? (static_cast<u64>(config.reserved[0] & 0xff) << 32) | config.reserved[1]
             : base_addr;
-        env = GraphicsEnvironment{*maxwell3d, *gpu_memory, program, address, start_address};
+        env = GraphicsEnvironment{*maxwell3d, *gpu_memory, program, address, start_address,
+                                  shader_infos[index]->lowered_native};
         env.SetCachedSize(shader_infos[index]->size_bytes);
         result.env_ptrs[env_index++] = &env;
     }
@@ -369,6 +371,7 @@ const ShaderInfo* ShaderCache::MakeShaderInfo(GenericEnvironment& env, VAddr cpu
         info->unique_hash = env.CalculateHash();
         info->size_bytes = env.ReadSizeBytes();
     }
+    info->lowered_native = env.LoweredNative();
     const size_t size_bytes{env.SourceSizeBytes() ? env.SourceSizeBytes() : info->size_bytes};
     const ShaderInfo* const result{info.get()};
     Register(std::move(info), cpu_addr, size_bytes);