renderer_{opengl,vulkan}: Clamp shared memory to host's limit

This stops shaders from failing to build when the exceed host's shared
memory size limit. An error is logged.

src/video_core/renderer_opengl/gl_arb_decompiler.cpp

@@ -892,12 +892,20 @@ void ARBDecompiler::DeclareCompute() {
     const ComputeInfo& info = registry.GetComputeInfo();
     AddLine("GROUP_SIZE {} {} {};", info.workgroup_size[0], info.workgroup_size[1],
             info.workgroup_size[2]);
-    if (info.shared_memory_size_in_words > 0) {
+    if (info.shared_memory_size_in_words == 0) {
-        const u32 size_in_bytes = info.shared_memory_size_in_words * 4;
+        return;
+    }
+    const u32 limit = device.GetMaxComputeSharedMemorySize();
+    u32 size_in_bytes = info.shared_memory_size_in_words * 4;
+    if (size_in_bytes > limit) {
+        LOG_ERROR(Render_OpenGL, "Shared memory size {} is clamped to host's limit {}",
+                  size_in_bytes, limit);
+        size_in_bytes = limit;
+    }
+
     AddLine("SHARED_MEMORY {};", size_in_bytes);
     AddLine("SHARED shared_mem[] = {{program.sharedmem}};");
 }
-}
 
 void ARBDecompiler::DeclareInputAttributes() {
     if (stage == ShaderType::Compute) {

src/video_core/renderer_opengl/gl_device.cpp

@@ -212,6 +212,7 @@ Device::Device()
     shader_storage_alignment = GetInteger<std::size_t>(GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT);
     max_vertex_attributes = GetInteger<u32>(GL_MAX_VERTEX_ATTRIBS);
     max_varyings = GetInteger<u32>(GL_MAX_VARYING_VECTORS);
+    max_compute_shared_memory_size = GetInteger<u32>(GL_MAX_COMPUTE_SHARED_MEMORY_SIZE);
     has_warp_intrinsics = GLAD_GL_NV_gpu_shader5 && GLAD_GL_NV_shader_thread_group &&
                           GLAD_GL_NV_shader_thread_shuffle;
     has_shader_ballot = GLAD_GL_ARB_shader_ballot;
@@ -248,6 +249,7 @@ Device::Device(std::nullptr_t) {
     shader_storage_alignment = 4;
     max_vertex_attributes = 16;
     max_varyings = 15;
+    max_compute_shared_memory_size = 0x10000;
     has_warp_intrinsics = true;
     has_shader_ballot = true;
     has_vertex_viewport_layer = true;

src/video_core/renderer_opengl/gl_device.h

@@ -52,6 +52,10 @@ public:
         return max_varyings;
     }
 
+    u32 GetMaxComputeSharedMemorySize() const {
+        return max_compute_shared_memory_size;
+    }
+
     bool HasWarpIntrinsics() const {
         return has_warp_intrinsics;
     }
@@ -114,6 +118,7 @@ private:
     std::size_t shader_storage_alignment{};
     u32 max_vertex_attributes{};
     u32 max_varyings{};
+    u32 max_compute_shared_memory_size{};
     bool has_warp_intrinsics{};
     bool has_shader_ballot{};
     bool has_vertex_viewport_layer{};

src/video_core/renderer_opengl/gl_shader_decompiler.cpp

@@ -602,8 +602,15 @@ private:
             return;
         }
         const auto& info = registry.GetComputeInfo();
-        if (const u32 size = info.shared_memory_size_in_words; size > 0) {
+        if (u32 size = info.shared_memory_size_in_words * 4; size > 0) {
-            code.AddLine("shared uint smem[{}];", size);
+            const u32 limit = device.GetMaxComputeSharedMemorySize();
+            if (size > limit) {
+                LOG_ERROR(Render_OpenGL, "Shared memory size {} is clamped to host's limit {}",
+                          size, limit);
+                size = limit;
+            }
+
+            code.AddLine("shared uint smem[{}];", size / 4);
             code.AddNewLine();
         }
         code.AddLine("layout (local_size_x = {}, local_size_y = {}, local_size_z = {}) in;",

src/video_core/renderer_vulkan/vk_device.h

@@ -122,6 +122,11 @@ public:
         return properties.limits.maxPushConstantsSize;
     }
 
+    /// Returns the maximum size for shared memory.
+    u32 GetMaxComputeSharedMemorySize() const {
+        return properties.limits.maxComputeSharedMemorySize;
+    }
+
     /// Returns true if ASTC is natively supported.
     bool IsOptimalAstcSupported() const {
         return is_optimal_astc_supported;

src/video_core/renderer_vulkan/vk_shader_decompiler.cpp

@@ -685,13 +685,19 @@ private:
         }
         t_smem_uint = TypePointer(spv::StorageClass::Workgroup, t_uint);
 
-        const u32 smem_size = specialization.shared_memory_size;
+        u32 smem_size = specialization.shared_memory_size * 4;
         if (smem_size == 0) {
             // Avoid declaring an empty array.
             return;
         }
-        const auto element_count = static_cast<u32>(Common::AlignUp(smem_size, 4) / 4);
+        const u32 limit = device.GetMaxComputeSharedMemorySize();
-        const Id type_array = TypeArray(t_uint, Constant(t_uint, element_count));
+        if (smem_size > limit) {
+            LOG_ERROR(Render_Vulkan, "Shared memory size {} is clamped to host's limit {}",
+                      smem_size, limit);
+            smem_size = limit;
+        }
+
+        const Id type_array = TypeArray(t_uint, Constant(t_uint, smem_size / 4));
         const Id type_pointer = TypePointer(spv::StorageClass::Workgroup, type_array);
         Name(type_pointer, "SharedMemory");