gl_device: Query SSBO alignment

src/video_core/renderer_opengl/gl_device.cpp

@@ -24,6 +24,7 @@ T GetInteger(GLenum pname) {
 
 Device::Device() {
     uniform_buffer_alignment = GetInteger<std::size_t>(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);
+    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);
     has_variable_aoffi = TestVariableAoffi();

src/video_core/renderer_opengl/gl_device.h

@@ -18,6 +18,10 @@ public:
         return uniform_buffer_alignment;
     }
 
+    std::size_t GetShaderStorageBufferAlignment() const {
+        return shader_storage_alignment;
+    }
+
     u32 GetMaxVertexAttributes() const {
         return max_vertex_attributes;
     }
@@ -39,6 +43,7 @@ private:
     static bool TestComponentIndexingBug();
 
     std::size_t uniform_buffer_alignment{};
+    std::size_t shader_storage_alignment{};
     u32 max_vertex_attributes{};
     u32 max_varyings{};
     bool has_variable_aoffi{};