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project/fm_viewer/fav/shaders/defish3.fsh

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+uniform sampler2D u_Texture0;
+uniform sampler2D u_Texture1;
+uniform sampler2D u_Texture2;
+
+// https://qiita.com/zinziroge/items/3676b4e0f7715fa60336
+// C:\Users\jeong\testing\theta_uvc_blender_mdk_ver.0.3.0
+// https://gist.github.com/dinhnhat0401/12910a5fee2e380051c55e5db752b279
+
+
+varying vec2 v_TexCoords0;
+varying vec2 v_TexCoords1;
+varying vec2 v_TexCoords2;
+
+#define v_TexCoords1 v_TexCoords0
+#define v_TexCoords2 v_TexCoords0
+#define v_TexCoords3 v_TexCoords0
+
+uniform float u_opacity;
+uniform mat4 u_colorMatrix;
+
+uniform mat3 tune360;
+
+void main(void)
+{
+    vec2 fc = v_TexCoords0.st;
+    vec2 src;
+
+    // Y 축은 상단이 1.0, 하단이 0.0
+    // 원점 확인
+    if(fc.x < 0.5) // left
+    {
+        // 좌측 이미지(0.5,1.0)-> 상단이미지(1.0,0.5)
+        src = vec2(fc.x*2.0,0.5+(fc.y*0.5));
+    }
+    else // right
+    {
+        // 후측 이미지(0.5,1.0)-> 상단이미지(1.0,0.5)
+        src = vec2((fc.x*2.0)-1.0,fc.y*0.5);
+    }
+
+
+    gl_FragColor = clamp(u_colorMatrix
+                             * vec4(texture2D(u_Texture0, src).r,
+                                    texture2D(u_Texture1, src).r,
+                                    texture2D(u_Texture2, src).r,
+                                    1.0), 0.0, 1.0);
+}