From 7018e524f5e6217b3259333acc4ea09ad036d331 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Mon, 19 Apr 2021 16:33:23 -0300
Subject: shader: Add NVN storage buffer fallbacks
When we can't track the SSBO origin of a global memory instruction,
leave it as a global memory operation and assume these pointers are in
the NVN storage buffer slots, then apply a linear search in the shader's
runtime.
---
src/shader_recompiler/frontend/maxwell/program.cpp | 43 ++++++++++++++++++++++
1 file changed, 43 insertions(+)
(limited to 'src/shader_recompiler/frontend/maxwell/program.cpp')
diff --git a/src/shader_recompiler/frontend/maxwell/program.cpp b/src/shader_recompiler/frontend/maxwell/program.cpp
index 20a1d61cc4..14180dcd97 100644
--- a/src/shader_recompiler/frontend/maxwell/program.cpp
+++ b/src/shader_recompiler/frontend/maxwell/program.cpp
@@ -60,6 +60,48 @@ void CollectInterpolationInfo(Environment& env, IR::Program& program) {
}();
}
}
+
+void AddNVNStorageBuffers(IR::Program& program) {
+ if (!program.info.uses_global_memory) {
+ return;
+ }
+ const u32 driver_cbuf{0};
+ const u32 descriptor_size{0x10};
+ const u32 num_buffers{16};
+ const u32 base{[&] {
+ switch (program.stage) {
+ case Stage::VertexA:
+ case Stage::VertexB:
+ return 0x110u;
+ case Stage::TessellationControl:
+ return 0x210u;
+ case Stage::TessellationEval:
+ return 0x310u;
+ case Stage::Geometry:
+ return 0x410u;
+ case Stage::Fragment:
+ return 0x510u;
+ case Stage::Compute:
+ return 0x310u;
+ }
+ throw InvalidArgument("Invalid stage {}", program.stage);
+ }()};
+ auto& descs{program.info.storage_buffers_descriptors};
+ for (u32 index = 0; index < num_buffers; ++index) {
+ const u32 offset{base + index * descriptor_size};
+ const auto it{std::ranges::find(descs, offset, &StorageBufferDescriptor::cbuf_offset)};
+ if (it != descs.end()) {
+ continue;
+ }
+ // Assume these are written for now
+ descs.push_back({
+ .cbuf_index = driver_cbuf,
+ .cbuf_offset = offset,
+ .count = 1,
+ .is_written = true,
+ });
+ }
+}
} // Anonymous namespace
IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Block>& block_pool,
@@ -105,6 +147,7 @@ IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Blo
Optimization::VerificationPass(program);
Optimization::CollectShaderInfoPass(env, program);
CollectInterpolationInfo(env, program);
+ AddNVNStorageBuffers(program);
return program;
}
--
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