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Shader "Tutorial/039_ScreenspaceTextures/Unlit"{
//show values to edit in inspector
_Color ("Tint", Color) = (0, 0, 0, 1)
_MainTex ("Texture", 2D) = "white" {}
//the material is completely non-transparent and is rendered at the same time as the other opaque geometry
Tags{ "RenderType"="Opaque" "Queue"="Geometry"}
//include useful shader functions
#include "UnityCG.cginc"
//define vertex and fragment shader
#pragma vertex vert
#pragma fragment frag
//texture and transforms of the texture
sampler2D _MainTex;
float4 _MainTex_ST;
//tint of the texture
fixed4 _Color;
//the object data that's put into the vertex shader
struct appdata{
float4 vertex : POSITION;
//the data that's used to generate fragments and can be read by the fragment shader
struct v2f{
float4 position : SV_POSITION;
float4 screenPosition : TEXCOORD0;
//the vertex shader
v2f vert(appdata v){
v2f o;
//convert the vertex positions from object space to clip space so they can be rendered
o.position = UnityObjectToClipPos(v.vertex);
o.screenPosition = ComputeScreenPos(o.position);
return o;
//the fragment shader
fixed4 frag(v2f i) : SV_TARGET{
float2 textureCoordinate = i.screenPosition.xy / i.screenPosition.w;
float aspect = _ScreenParams.x / _ScreenParams.y;
textureCoordinate.x = textureCoordinate.x * aspect;
textureCoordinate = TRANSFORM_TEX(textureCoordinate, _MainTex);
fixed4 col = tex2D(_MainTex, textureCoordinate);
col *= _Color;
return col;