// 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

#include <AnKi/Shaders/Common.hlsl>
#include <AnKi/Shaders/Include/MiscRendererTypes.h>

struct VertOut
{
	Vec3 m_uv : TEXCOORD;
	Vec4 m_color : COLOR;
	Vec4 m_svPosition : SV_POSITION;
};

#if ANKI_VERTEX_SHADER

// The block contains data for all flares
StructuredBuffer<LensFlareSprite> g_sprites : register(t0);

VertOut main(U32 svVertexId : SV_VERTEXID, U32 svInstanceId : SV_INSTANCEID)
{
	const Vec2 position = uvToNdc(Vec2(svVertexId & 1, svVertexId >> 1));

	const LensFlareSprite sprite = g_sprites[svInstanceId];

	// Write tex coords of the 2D array texture
	VertOut output;
	output.m_uv = Vec3((position * 0.5) + 0.5, sprite.m_depthPad3.x);

	const Vec4 posScale = sprite.m_posScale;
	output.m_svPosition = Vec4(position * posScale.zw + posScale.xy, 0.0, 1.0);

	output.m_color = sprite.m_color;

	return output;
}
#endif // ANKI_VERTEX_SHADER

#if ANKI_PIXEL_SHADER
SamplerState g_trilinearRepeatSampler : register(s0);
Texture2DArray<Vec4> g_tex : register(t1);

Vec4 main(VertOut input) : SV_TARGET0
{
	const Vec4 col = g_tex.Sample(g_trilinearRepeatSampler, input.m_uv);
	return col * input.m_color;
}
#endif