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DX11 Dynamic texture problem

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Hi Guys,

I am having a bit of a problem with a dynamic texture.

It is creating without error and I am attempting to initialize the first pixel to white to make sure I am mapping correctly. But when I draw the texture to the quad it displays the whole quad white (instead of just one pixel).

This is how I am creating, mapping, and setting the first pixel to white. But as mentioned, when I draw the quad, the entire quad is white.


	// Create dynamic texture
	D3D11_TEXTURE2D_DESC textureDesc = { 0 };
	textureDesc.Width = 2048;
	textureDesc.Height = 2048;
	textureDesc.MipLevels = 1;
	textureDesc.ArraySize = 1;
	textureDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
	textureDesc.SampleDesc.Count = 1;
	textureDesc.Usage = D3D11_USAGE_DYNAMIC;
	textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
	textureDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
	textureDesc.MiscFlags = 0;

	HRESULT result = d3dDevice->CreateTexture2D(&textureDesc, NULL, &textureDynamic);
	if (FAILED(result))
		return -1;

	result = d3dDevice->CreateShaderResourceView(textureDynamic, 0, &textureRV);
	if (FAILED(result))
		return -2;

	if (FAILED(d3dContext->Map(textureDynamic, 0, D3D11_MAP_WRITE_DISCARD, 0, &resource)))
		return -1;
	memset(resource.pData, 255, 4);
	d3dContext->Unmap(textureDynamic, 0);


Hopefully I have just made an oversight somewhere.

Any assistance would be greatly appreciated :)

(If I change the 255 value to 128 the quad then turns grey, so the mapping is definitely doing something. Just can't work out why it is colouring the whole quad and not the first pixel)

Edited by lonewolff

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Thanks Hodgman,

I knew the UV's were ok, but you jogged my memory. I hadn't updated the input description code and only had vertex position.

I have now updated it to use the texcoords as well and all is now good.

Thanks again :)

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