220 lines
6.6 KiB
GLSL
220 lines
6.6 KiB
GLSL
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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// Copyright (c) 2015 Nora
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// Released under the MIT license
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// http://opensource.org/licenses/mit-license.php
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Shader "Theta/RealtimeEquirectangular1080p"
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{
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Properties
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{
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[NoScaleOffset] _MainTex("Texture", 2D) = "white" {}
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_UVOffset("UVOffset(Forward UV / Backward UV)", Vector) = (0.0, 0.0, 0.0, 0.0)
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[KeywordEnum(Theta S 1080p, Theta S, Theta, Insta360 Air)] _Mode("Mode", Int) = 0
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}
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SubShader
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{
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Tags{ "RenderType" = "Overlay" "Queue" = "Overlay" "ForceNoShadowCasting" = "True" }
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// Tags{ "RenderType" = "Opaque" "Queue" = "Geometry" "ForceNoShadowCasting" = "True" }
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ZTest Always
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Cull Off
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ZWrite Off
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma multi_compile _MODE_THETA_S_1080P _MODE_THETA_S _MODE_THETA _MODE_INSTA360_AIR
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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct v2f
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{
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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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};
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sampler2D _MainTex;
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float4 _UVOffset;
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#if defined(_MODE_THETA_S_1080P)
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#define _RADIUS 0.4425
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#define _TEXTURE_Y_OFFSET 0
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#define _TEXTURE_Y_SCALE (640.0 / 720.0)
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#define _FORWARD_ROTATION_DEGREE 0
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#define _BACKWARD_ROTATION_DEGREE 0
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#elif defined(_MODE_THETA_S)
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#define _RADIUS 0.445
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#define _TEXTURE_Y_OFFSET ((720.0 - 640.0) / 720.0)
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#define _TEXTURE_Y_SCALE (640.0 / 720.0)
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#define _FORWARD_ROTATION_DEGREE 0
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#define _BACKWARD_ROTATION_DEGREE 0
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#elif defined(_MODE_INSTA360_AIR)
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#define _INSTA360_AIR_SENSOR_ROTATION_DEGREE 4.0
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#define _RADIUS 0.47
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#define _TEXTURE_Y_OFFSET 0
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#define _TEXTURE_Y_SCALE 1
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#define _FORWARD_ROTATION_DEGREE (-90 + _INSTA360_AIR_SENSOR_ROTATION_DEGREE)
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#define _BACKWARD_ROTATION_DEGREE (90 + _INSTA360_AIR_SENSOR_ROTATION_DEGREE)
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#else
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#define _RADIUS 0.445
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#define _TEXTURE_Y_OFFSET 0
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#define _TEXTURE_Y_SCALE 1
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#define _FORWARD_ROTATION_DEGREE 0
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#define _BACKWARD_ROTATION_DEGREE 0
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#endif
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v2f vert (appdata v)
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{
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v2f o;
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// MVP行列を掛ける
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// mul(UNITY_MATRIX_MVP, v.vertex)と同じ処理だけどパフォーマンス良いらしい
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = v.uv;
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// プラットフォームによる射影行列の違いを吸収
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o.uv.y *= _ProjectionParams.x;
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return o;
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}
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// ２次元変換行列 （３次元目は平行移動用に使う）
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float3x3 rotate_matrix_radian(float rot) {
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float sinX = sin(rot);
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float cosX = cos(rot);
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return float3x3(cosX, -sinX, 0, sinX, cosX, 0, 0, 0, 1);
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}
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// Scale/Rotate/Translate Matrix群
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float3x3 rotate_matrix_degree(float rot) {
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return rotate_matrix_radian(rot * UNITY_PI / 180.0);
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}
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float3x3 scale_matrix(float2 scale) {
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return float3x3(scale.x, 0, 0, 0, scale.y, 0, 0, 0, 1);
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}
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float3x3 scaleX_matrix(float x) {
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return float3x3(x, 0, 0, 0, 1, 0, 0, 0, 1);
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}
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float3x3 scaleY_matrix(float y) {
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return float3x3(1, 0, 0, 0, y, 0, 0, 0, 1);
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}
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float3x3 translate_matrix(float2 vec) {
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return float3x3(1, 0, 0, 0, 1, 0, vec.x, vec.y, 1);
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}
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float3x3 translateX_matrix(float x) {
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return float3x3(1, 0, 0, 0, 1, 0, x, 0, 1);
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}
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float3x3 translateY_matrix(float y) {
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return float3x3(1, 0, 0, 0, 1, 0, 0, y, 1);
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}
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float3x3 texture_matrix3() {
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float3x3 mat = float3x3(1, 0, 0, 0, 1, 0, 0, 0, 1);
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mat = mul(mat, scaleY_matrix(_TEXTURE_Y_SCALE));
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mat = mul(mat, translateY_matrix(_TEXTURE_Y_OFFSET));
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return mat;
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}
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// forward用変換行列
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// (0,0)を中心として半径1の範囲の座標、をテクスチャ座標に変換するmatrix
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// 計算量多いようだが、すべてコンパイル時に解決されるはず。
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float3x3 forward_matrix3() {
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float3x3 mat = float3x3(1, 0, 0, 0, 1, 0, 0, 0, 1);
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mat = mul(mat, rotate_matrix_degree(_FORWARD_ROTATION_DEGREE));
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mat = mul(mat, translate_matrix(float2(0.5, 0.5)));
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// 裏側なので逆方向にする
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mat = mul(mat, scaleX_matrix(-1));
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mat = mul(mat, translateX_matrix(1));
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// XのUV幅は半分なので x0.5
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mat = mul(mat, scaleX_matrix(0.5));
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// オフセット
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mat = mul(mat, translate_matrix(_UVOffset.yx));
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mat = mul(mat, texture_matrix3());
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return mat;
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}
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// backward用変換行列
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// (0,0)を中心として半径1の範囲の座標、をテクスチャ座標に変換するmatrix
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// 計算量多いようだが、すべてコンパイル時に解決されるはず。
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float3x3 backward_matrix3() {
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float3x3 mat = float3x3(1, 0, 0, 0, 1, 0, 0, 0, 1);
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mat = mul(mat, rotate_matrix_degree(_BACKWARD_ROTATION_DEGREE));
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mat = mul(mat, translate_matrix(float2(0.5, 0.5)));
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// 片目分のUV幅は半分なので x0.5
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mat = mul(mat, scaleX_matrix(0.5));
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// 右側なので +0.5
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mat = mul(mat, translateX_matrix(0.5));
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// Y逆方向
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mat = mul(mat, scaleY_matrix(-1));
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mat = mul(mat, translateY_matrix(1));
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// オフセット
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mat = mul(mat, translate_matrix(_UVOffset.wz));
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mat = mul(mat, texture_matrix3());
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return mat;
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}
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float2 convert_for_forward(float2 st) {
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return mul(float3(st.x, st.y, 1), forward_matrix3()).xy;
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}
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float2 convert_for_backward(float2 st) {
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return mul(float3(st.x, st.y, 1), backward_matrix3()).xy;
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}
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float4 frag(v2f i) : SV_Target
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{
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// float2 revUV = i.uv;
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float2 revUV = float2(i.uv.x, 1.0 - i.uv.y); // THETAの画像そのままだと上下が入れ替わってしまうので対策
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if (i.uv.x <= 0.5) {
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revUV.x = 1.0 - revUV.x * 2.0;
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}
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else {
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revUV.x = 1.0 - (revUV.x - 0.5) * 2.0;
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}
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revUV *= UNITY_PI;
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float3 p = float3(cos(revUV.x), cos(revUV.y), sin(revUV.x));
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p.xz *= sqrt(1.0 - p.y * p.y);
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float r = 1.0 - asin(p.z) / (UNITY_PI / 2.0);
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float2 st = float2(p.y, p.x);
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st *= r / sqrt(1.0 - p.z * p.z);
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st *= _RADIUS;
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// stは (0,0)を中心としたFisheye座標
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float4 col;
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if (i.uv.x <= 0.5)
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{ // 後
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st = convert_for_backward(st);
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#if !defined(SHADER_API_OPENGL)
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col = tex2Dlod(_MainTex, float4(st, 0.0, 0.0));
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#else // Memo: OpenGL not supported tex2Dlod.( Texture should be setting to generateMipMap = off. )
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col = tex2D(_MainTex, st);
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#endif
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}
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else {
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// 前
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st = convert_for_forward(st);
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#if !defined(SHADER_API_OPENGL)
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col = tex2Dlod(_MainTex, float4(st, 0.0, 0.0));
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#else // Memo: OpenGL not supported tex2Dlod.( Texture should be setting to generateMipMap = off. )
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col = tex2D(_MainTex, st);
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#endif
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}
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return col;
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}
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ENDCG
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}
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}
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}
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