[Rendering] Fixes to flickering;

Author: LittleCodingFox

Engine/Staple.Core/Rendering/RenderSystem/Backend/Impls/SDLGPU/Commands/SDLGPUUpdateIndexBufferCommand.cs

@@ -31,7 +31,7 @@ public void Update(IRendererBackend rendererBackend)
                 buffer.buffer = nint.Zero;
             }
 
-            var usageFlags = SDL.SDL_GPUBufferUsageFlags.SDL_GPU_BUFFERUSAGE_VERTEX;
+            var usageFlags = SDL.SDL_GPUBufferUsageFlags.SDL_GPU_BUFFERUSAGE_INDEX;
 
             if (buffer.flags.HasFlag(RenderBufferFlags.GraphicsRead))
             {
@@ -95,7 +95,7 @@ public void Update(IRendererBackend rendererBackend)
             return;
         }
 
-        var mapData = SDL.SDL_MapGPUTransferBuffer(backend.device, buffer.transferBuffer, true);
+        var mapData = SDL.SDL_MapGPUTransferBuffer(backend.device, buffer.transferBuffer, false);
 
         unsafe
         {
@@ -122,6 +122,6 @@ public void Update(IRendererBackend rendererBackend)
             size = (uint)data.Length,
         };
 
-        SDL.SDL_UploadToGPUBuffer(backend.copyPass, in location, in region, true);
+        SDL.SDL_UploadToGPUBuffer(backend.copyPass, in location, in region, false);
     }
 }

Engine/Staple.Core/Rendering/RenderSystem/Backend/Impls/SDLGPU/Commands/SDLGPUUpdateTextureCommand.cs

@@ -82,6 +82,6 @@ public void Update(IRendererBackend rendererBackend)
             d = 1,
         };
 
-        SDL.SDL_UploadToGPUTexture(backend.copyPass, in textureInfo, in destination, true);
+        SDL.SDL_UploadToGPUTexture(backend.copyPass, in textureInfo, in destination, false);
     }
 }

Engine/Staple.Core/Rendering/RenderSystem/Backend/Impls/SDLGPU/Commands/SDLGPUUpdateVertexBufferCommand.cs

@@ -95,7 +95,7 @@ public void Update(IRendererBackend rendererBackend)
             return;
         }
 
-        var mapData = SDL.SDL_MapGPUTransferBuffer(backend.device, buffer.transferBuffer, true);
+        var mapData = SDL.SDL_MapGPUTransferBuffer(backend.device, buffer.transferBuffer, false);
 
         unsafe
         {
@@ -122,6 +122,6 @@ public void Update(IRendererBackend rendererBackend)
             size = (uint)data.Length,
         };
 
-        SDL.SDL_UploadToGPUBuffer(backend.copyPass, in location, in region, true);
+        SDL.SDL_UploadToGPUBuffer(backend.copyPass, in location, in region, false);
     }
 }

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

@@ -290,6 +290,11 @@ public void Destroy()
                 ReleaseBufferResource(resource);
             }
 
+            foreach(var resource in textures)
+            {
+                ReleaseTextureResource(resource);
+            }
+
             depthTexture?.Destroy();
 
             depthTexture = null;