I am working on a 3D engine as a hobby (Direct3D 11). Currently I am trying to implement sRGB -> linear -> sRGB color space conversions via texture formats with "_SRGB" suffix. So, my textures are supposed to be sRGB images (for example, DDS-files compressed in BC1_UNORM_SRGB format), output is also gamma-corrected (thanks to R8G8B8A8_UNORM_SRGB frame buffer) and all shader calculations are made in linear color space.
The problem is, whether I use sRGB or non-sRGB format for the DDS-file, after sampling the texture I get exactly the same color values inside the shader that are stored in original image. But if I get it correctly, sampler should apply implicit gamma correction
(pow(color, 2.2f)) for the input values. So, for example, if I want to output the same color as is in the map (lets say, 0.5f for R channel), I sample it from the texture (0.5f becomes 0.218f after transferring to linear color space by sampler), then I do nothing with it inside the shader and send to output. As the frame buffer has sRGB format, merger (or some other part of pipeline, that does it) will apply gamma re-correction to our value
(pow(color, 1.0f / 2.2f)), and 0.218f will become 0.5f again. I will get the same image as I had on the input.
The output colors are definitely gamma corrected, as I see clear difference when I change frame buffer format from sRGB to non-sRGB. But as no input correction is applied, the final image looks brightened comparing to the input one. As I said, I checked the value in pixel shader after
texture.Sample() call, and it is exactly the same as colorpicker shows for the source texture. When I swap the texture format to non-sRGB, nothing changes (I use Visual Studio 2013 Update 4 for format changing).
To load DDS files I use DDSTextureLoader. I also called Direct3D methods directly to create resource and view from the file, but nothing changed. Both resource and shader resource view have "_SRGB" format, as I can see in Graphics Debugger, so they are definitely sRGB ones.
I've read at MSDN that in Direct3D 11 setting texture format is enough for sampler to recognize sRGB image. Is there something I am doing wrong or missing, or understand incorrectly? Maybe someone had similar issues? Any advice would be highly appreciated!