[Rendering] Fixed SDL GPU Render Target Sampler usage;

Author: LittleCodingFox

Engine/Staple.Core/Rendering/RenderSystem/Backend/Impls/SDLGPU/SDLGPURendererBackend+Textures.cs

@@ -453,11 +453,13 @@ SDL.SDL_GPUTextureUsageFlags HandleFlags(SDL.SDL_GPUTextureUsageFlags f)
 
         if (flags.HasFlag(TextureFlags.ColorTarget))
         {
-            return HandleFlags(SDL.SDL_GPUTextureUsageFlags.SDL_GPU_TEXTUREUSAGE_COLOR_TARGET);
+            return HandleFlags(SDL.SDL_GPUTextureUsageFlags.SDL_GPU_TEXTUREUSAGE_SAMPLER |
+                SDL.SDL_GPUTextureUsageFlags.SDL_GPU_TEXTUREUSAGE_COLOR_TARGET);
         }
         else if (flags.HasFlag(TextureFlags.DepthStencilTarget))
         {
-            return HandleFlags(SDL.SDL_GPUTextureUsageFlags.SDL_GPU_TEXTUREUSAGE_DEPTH_STENCIL_TARGET);
+            return HandleFlags(SDL.SDL_GPUTextureUsageFlags.SDL_GPU_TEXTUREUSAGE_SAMPLER | 
+                SDL.SDL_GPUTextureUsageFlags.SDL_GPU_TEXTUREUSAGE_DEPTH_STENCIL_TARGET);
         }
 
         return HandleFlags(SDL.SDL_GPUTextureUsageFlags.SDL_GPU_TEXTUREUSAGE_SAMPLER);

Engine/Staple.Core/Rendering/RenderSystem/Backend/Impls/SDLGPU/SDLGPURendererBackend.cs

@@ -836,12 +836,17 @@ internal void ResumeRenderPass()
         }
         else
         {
-            //TODO: texture
+            if (viewData.renderTarget.ColorTextureCount > 0 &&
+                viewData.renderTarget.colorTextures[0].impl is SDLGPUTexture t &&
+                TryGetTexture(t.handle, out var textureResource))
+            {
+                texture = textureResource.texture;
+            }
 
             width = viewData.renderTarget.width;
             height = viewData.renderTarget.height;
 
-            return;
+            depthTexture = viewData.renderTarget.DepthTexture?.impl as SDLGPUTexture;
         }
 
         if (texture == nint.Zero ||