shader_unit: Intialize temporaries on shader invocation

src/video_core/pica/shader_unit.cpp

@@ -9,7 +9,10 @@
 
 namespace Pica {
 
-ShaderUnit::ShaderUnit(GeometryEmitter* emitter) : emitter_ptr{emitter} {}
+ShaderUnit::ShaderUnit(GeometryEmitter* emitter) : emitter_ptr{emitter} {
+    const Common::Vec4<f24> temp_vec{f24::Zero(), f24::Zero(), f24::Zero(), f24::One()};
+    temporary.fill(temp_vec);
+}
 
 ShaderUnit::~ShaderUnit() = default;
 

src/video_core/rasterizer_cache/rasterizer_cache.h

@@ -67,16 +67,6 @@ RasterizerCache<T>::RasterizerCache(Memory::MemorySystem& memory_,
                                            .wrap_s = TextureConfig::WrapMode::ClampToBorder,
                                            .wrap_t = TextureConfig::WrapMode::ClampToBorder,
                                        }));
-
-    auto& null_surface = slot_surfaces[NULL_SURFACE_ID];
-    runtime.ClearTexture(null_surface, {
-                                           .texture_level = 0,
-                                           .texture_rect = null_surface.GetScaledRect(),
-                                           .value =
-                                               {
-                                                   .color = {0.f, 0.f, 0.f, 0.f},
-                                               },
-                                       });
 }
 
 template <class T>

src/video_core/shader/generator/glsl_shader_gen.cpp

@@ -63,13 +63,7 @@ static std::string GetVertexInterfaceDeclaration(bool is_output, bool use_clip_p
     if (is_output && separable_shader) {
         // gl_PerVertex redeclaration is required for separate shader object
         out += "out gl_PerVertex {\n";
-        // Apple Silicon GPU drivers optimize more aggressively, which can create
-        // too much variance and cause visual artifacting in games like Pokemon.
-#ifdef __APPLE__
         out += "    invariant vec4 gl_Position;\n";
-#else
-        out += "    vec4 gl_Position;\n";
-#endif
         if (use_clip_planes) {
             out += "    float gl_ClipDistance[2];\n";
         }