/*
===========================================================================
Copyright (C) 2023-2024 Gian 'myT' Schellenbaum

This file is part of Challenge Quake 3 (CNQ3).

Challenge Quake 3 is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.

Challenge Quake 3 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Challenge Quake 3. If not, see <https://www.gnu.org/licenses/>.
===========================================================================
*/
// Dear ImGui integration


cbuffer RootConstants : register(b0)
{
	float4x4 projectionMatrix;
	uint textureIndex;
	uint samplerIndex;
	float mipIndex;
	float colorScale;
};

struct VIn
{
	float2 pos : POSITION;
	float4 col : COLOR0;
	float2 uv : TEXCOORD0;
};

struct VOut
{
	float4 pos : SV_POSITION;
	float4 col : COLOR0;
	float2 uv : TEXCOORD0;
};

VOut vs(VIn input)
{
	VOut output;
	output.pos = mul(projectionMatrix, float4(input.pos.xy, 0.0, 1.0));
	output.col = input.col;
	output.uv = input.uv;

	return output;
}

float4 ps(VOut input) : SV_Target
{
	Texture2D texture0 = ResourceDescriptorHeap[textureIndex];
	SamplerState sampler0 = SamplerDescriptorHeap[samplerIndex];
	float4 color = float4(colorScale.xxx, 1);
	float4 result = input.col * color * texture0.SampleLevel(sampler0, input.uv, mipIndex);

	return result;
}