add main scene and get release from nejabat 3

mainScene.fs

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+#version 330
+
+in vec2 f_texCoord;
+out vec4 fragColor;
+
+uniform sampler2D tex;
+
+vec4 cubic(float v){
+    vec4 n = vec4(1.0, 2.0, 3.0, 4.0) - v;
+    vec4 s = n * n * n;
+    float x = s.x;
+    float y = s.y - 4.0 * s.x;
+    float z = s.z - 4.0 * s.y + 6.0 * s.x;
+    float w = 6.0 - x - y - z;
+    return vec4(x, y, z, w) * (1.0/6.0);
+}
+
+vec4 textureBicubic(sampler2D sampler, vec2 texCoords){
+
+   vec2 texSize = textureSize(sampler, 0);
+   vec2 invTexSize = 1.0 / texSize;
+   
+   texCoords = texCoords * texSize - 0.5;
+
+   
+    vec2 fxy = fract(texCoords);
+    texCoords -= fxy;
+
+    vec4 xcubic = cubic(fxy.x);
+    vec4 ycubic = cubic(fxy.y);
+
+    vec4 c = texCoords.xxyy + vec2 (-0.5, +1.5).xyxy;
+    
+    vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);
+    vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;
+    
+    offset *= invTexSize.xxyy;
+    
+    vec4 sample0 = texture2D(sampler, offset.xz);
+    vec4 sample1 = texture2D(sampler, offset.yz);
+    vec4 sample2 = texture2D(sampler, offset.xw);
+    vec4 sample3 = texture2D(sampler, offset.yw);
+
+    float sx = s.x / (s.x + s.y);
+    float sy = s.z / (s.z + s.w);
+
+    return mix(
+       mix(sample3, sample2, sx), mix(sample1, sample0, sx)
+    , sy);
+}
+
+void main(void)
+{
+   fragColor = textureBicubic(tex, f_texCoord.xy);
+}

mainScene.vs

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+#version 330
+
+in vec2 v_vertex;
+in vec2 v_texCoord;
+out vec2 f_texCoord;
+
+uniform mat4 transform;
+
+void main(void)
+{
+   gl_Position = transform * vec4(v_vertex, 0.0, 1.0);
+   f_texCoord = v_texCoord;
+}