Do not try to create a texture pool if shader does not use textures (#7379)

Ryujinx was not hinting application name, so on some platforms (e.g.
Linux) volume control shows Ryujinx as 'SDL Application'. This can cause
confusion.

This commit fixes name in volume control applets on some platforms.

see: https://wiki.libsdl.org/SDL2/SDL_HINT_APP_NAME

src/Ryujinx.Graphics.Gpu/Shader/ShaderSpecializationState.cs

@@ -743,7 +743,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
                 constantBufferUsePerStageMask &= ~(1 << index);
             }
 
-            if (checkTextures)
+            if (checkTextures && _allTextures.Length > 0)
             {
                 TexturePool pool = channel.TextureManager.GetTexturePool(poolState.TexturePoolGpuVa, poolState.TexturePoolMaximumId);
 

src/Ryujinx.SDL2.Common/SDL2Driver.cs

@@ -53,6 +53,7 @@ namespace Ryujinx.SDL2.Common
                     return;
                 }
 
+                SDL_SetHint(SDL_HINT_APP_NAME, "Ryujinx");
                 SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_PS4_RUMBLE, "1");
                 SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_PS5_RUMBLE, "1");
                 SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");