Remove memory allocations in some hot paths

4 files changed, 5 insertions, 4 deletions

diff --git a/src/shader_recompiler/backend/glsl/glsl_emit_context.cpp b/src/shader_recompiler/backend/glsl/glsl_emit_context.cpp
index c3c2281bb..9ff4028c2 100644
--- a/src/shader_recompiler/backend/glsl/glsl_emit_context.cpp
+++ b/src/shader_recompiler/backend/glsl/glsl_emit_context.cpp
@@ -479,7 +479,7 @@ void EmitContext::DefineGenericOutput(size_t index, u32 invocations) {
         const u32 remainder{4 - element};
         const TransformFeedbackVarying* xfb_varying{};
         const size_t xfb_varying_index{base_index + element};
-        if (xfb_varying_index < runtime_info.xfb_varyings.size()) {
+        if (xfb_varying_index < runtime_info.xfb_count) {
             xfb_varying = &runtime_info.xfb_varyings[xfb_varying_index];
             xfb_varying = xfb_varying->components > 0 ? xfb_varying : nullptr;
         }
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv.cpp b/src/shader_recompiler/backend/spirv/emit_spirv.cpp
index 0f86a8004..34592a01f 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv.cpp
@@ -387,7 +387,7 @@ void SetupSignedNanCapabilities(const Profile& profile, const IR::Program& progr
 }
 
 void SetupTransformFeedbackCapabilities(EmitContext& ctx, Id main_func) {
-    if (ctx.runtime_info.xfb_varyings.empty()) {
+    if (ctx.runtime_info.xfb_count == 0) {
         return;
     }
     ctx.AddCapability(spv::Capability::TransformFeedback);
diff --git a/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp b/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
index fd15f47ea..bec5db173 100644
--- a/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
@@ -160,7 +160,7 @@ void DefineGenericOutput(EmitContext& ctx, size_t index, std::optional<u32> invo
         const u32 remainder{4 - element};
         const TransformFeedbackVarying* xfb_varying{};
         const size_t xfb_varying_index{base_attr_index + element};
-        if (xfb_varying_index < ctx.runtime_info.xfb_varyings.size()) {
+        if (xfb_varying_index < ctx.runtime_info.xfb_count) {
             xfb_varying = &ctx.runtime_info.xfb_varyings[xfb_varying_index];
             xfb_varying = xfb_varying->components > 0 ? xfb_varying : nullptr;
         }
diff --git a/src/shader_recompiler/runtime_info.h b/src/shader_recompiler/runtime_info.h
index 3b63c249f..619c0b138 100644
--- a/src/shader_recompiler/runtime_info.h
+++ b/src/shader_recompiler/runtime_info.h
@@ -84,7 +84,8 @@ struct RuntimeInfo {
     bool glasm_use_storage_buffers{};
 
     /// Transform feedback state for each varying
-    std::vector<TransformFeedbackVarying> xfb_varyings;
+    std::array<TransformFeedbackVarying, 256> xfb_varyings{};
+    u32 xfb_count{0};
 };
 
 } // namespace Shader