Vulkan: Make scaling shaders compatible + fixes

[goeiecool9999]

Make built-in scaling shaders compatible with vulkan and incorporate the fixes from #879

Changes for graphic pack developers

• Cemu now prepends a preamble containing all the uniforms so you can just write the shader parts 😄
• preamble uses GLSL version 430
• textureSrcResolution is now the actual resolution of the textureSrc sampler.
• inputResolution has been replaced by nativeResolution and gives the resolution that the game would render at without graphic pack overrides.

Full preamble (as of writing) for reference

Cemu/src/Cafe/HW/Latte/Renderer/RendererOuputShader.cpp

Lines 287 to 302 in e2e9e81

	return R"(#version 430
	#ifdef VULKAN
	layout(push_constant) uniform pc {
	vec2 textureSrcResolution;
	vec2 nativeResolution;
	vec2 outputResolution;
	};
	#else
	uniform vec2 textureSrcResolution;
	uniform vec2 nativeResolution;
	uniform vec2 outputResolution;
	#endif
	layout(location = 0) in vec2 passUV;
	layout(binding = 0) uniform sampler2D textureSrc;
	layout(location = 0) out vec4 colorOut0;

[Ammar-Sadaoui]

do you have plan to support spir-v directly ?

[Exzap]

After merging this some users might be confused about why their image quality suddenly changed. So I wonder if we should force-reset to bilinear as part of this PR? It would unfortunately also reset the scaling options on OpenGL but that might be the lesser evil.

[goeiecool9999]

some users might be confused about why their image quality suddenly changed

Considering people already convinced themselves that hermite looks better than bilinear when it wasn't even implemented I don't think it's that big of a deal. You have to really pixel peep to tell the difference. I think it would probably be equally or slightly more confusing if a user remembered their settings and saw that they changed on their own.
If you do want to force bilinear after updating how would we go about that? Does Cemu have a mechanism to detect the first launch after updating?

[Exzap]

Did some more comparisons and yeah it's probably fine. Hermite starts looking bad for really large upscale factors, but thats beyond what anyone would reasonably run into.