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//TriangleShaderFS
precision mediump float;
varying vec2 v_uv;
 
uniform sampler2D u_s_texture;
uniform sampler2D u_s_texture2;
uniform sampler2D mask;
 
 
void main()  
{
 
vec4 texel0, texel1, texel2, resultColor;
texel0 = texture2D(u_s_texture, v_uv);
texel1 = texture2D(u_s_texture2, v_uv);
texel2 = texture2D(mask, v_uv);
 
//gl_FragColor = texture2D(u_s_texture, v_uv);
gl_FragColor = mix (texel0, texel1, texel2.a);
}

prog.cpp:2:1: error: ‘precision’ does not name a type
 precision mediump float;
 ^
prog.cpp:3:1: error: ‘varying’ does not name a type
 varying vec2 v_uv;
 ^
prog.cpp:4:1: error: ‘uniform’ does not name a type
 uniform sampler2D u_s_texture;
 ^
prog.cpp:5:11: error: ‘::main’ must return ‘int’
 void main()  
           ^
prog.cpp: In function ‘int main()’:
prog.cpp:7:1: error: ‘gl_FragColor’ was not declared in this scope
 gl_FragColor = texture2D(u_s_texture, v_uv);
 ^
prog.cpp:7:26: error: ‘u_s_texture’ was not declared in this scope
 gl_FragColor = texture2D(u_s_texture, v_uv);
                          ^
prog.cpp:7:39: error: ‘v_uv’ was not declared in this scope
 gl_FragColor = texture2D(u_s_texture, v_uv);
                                       ^
prog.cpp:7:43: error: ‘texture2D’ was not declared in this scope
 gl_FragColor = texture2D(u_s_texture, v_uv);
                                           ^

Standard output is empty