// Copyright (C) 2009-present, Panagiotis Christopoulos Charitos and contributors.
// All rights reserved.
// Code licensed under the BSD License.
// http://www.anki3d.org/LICENSE

#pragma anki technique vert pixel comp

#include <AnKi/Shaders/QuadVert.hlsl>

#if ANKI_COMPUTE_SHADER || ANKI_PIXEL_SHADER
#	include <AnKi/Shaders/Functions.hlsl>

SamplerState g_linearAnyClampSampler : register(s0);
Texture2D<Vec4> g_inputTex : register(t0);

#	if ANKI_COMPUTE_SHADER
#		define USE_COMPUTE 1
#	else
#		define USE_COMPUTE 0
#	endif

#	if USE_COMPUTE
RWTexture2D<Vec4> g_storageTex : register(u0);

struct Consts
{
	Vec2 m_viewportSize;
	UVec2 m_viewportSizeU;
};
ANKI_FAST_CONSTANTS(Consts, g_consts)
#	endif

#	if USE_COMPUTE
[numthreads(8, 8, 1)] void main(UVec3 svDispatchThreadId : SV_DISPATCHTHREADID)
#	else
Vec3 main(VertOut input) : SV_TARGET0
#	endif
{
#	if USE_COMPUTE
	if(skipOutOfBoundsInvocations(UVec2(8, 8), g_consts.m_viewportSizeU, svDispatchThreadId.xy))
	{
		return;
	}

	const Vec2 uv = (Vec2(svDispatchThreadId.xy) + 0.5) / g_consts.m_viewportSize;
#	else
	const Vec2 uv = input.m_uv;
#	endif

	const Vec3 color = g_inputTex.SampleLevel(g_linearAnyClampSampler, uv, 0.0).rgb;

#	if USE_COMPUTE
	g_storageTex[svDispatchThreadId.xy] = Vec4(color, 0.0);
#	else
	return color;
#	endif
}
#endif // ANKI_COMPUTE_SHADER || ANKI_PIXEL_SHADER