GPU: Ignore disabled textures and textures with an invalid address.

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -636,7 +636,11 @@ u32 RasterizerOpenGL::SetupTextures(Maxwell::ShaderStage stage, GLuint program,
         glProgramUniform1i(program, uniform, current_bindpoint);
 
         const auto texture = maxwell3d.GetStageTexture(entry.GetStage(), entry.GetOffset());
-        ASSERT(texture.enabled);
+
+        if (!texture.enabled) {
+            state.texture_units[current_bindpoint].texture_2d = 0;
+            continue;
+        }
 
         texture_samplers[current_bindpoint].SyncWithConfig(texture.tsc);
         Surface surface = res_cache.GetTextureSurface(texture);

src/video_core/renderer_opengl/gl_rasterizer_cache.cpp

@@ -454,6 +454,11 @@ Surface RasterizerCacheOpenGL::GetSurface(const SurfaceParams& params) {
         return {};
     }
 
+    const auto& gpu = Core::System::GetInstance().GPU();
+    // Don't try to create any entries in the cache if the address of the texture is invalid.
+    if (gpu.memory_manager->GpuToCpuAddress(params.addr) == boost::none)
+        return {};
+
     // Check for an exact match in existing surfaces
     const auto& surface_key{SurfaceKey::Create(params)};
     const auto& search{surface_cache.find(surface_key)};