Bug 238111

I am receiving the following error when calling "glLinkProgram" (so here I am): > Internal error compiling shader with Metal backend. > Please submit this shader, or website as a bug to https://bugs.webkit.org I am trying compile and link an OpenGL ES 2.0 shader via ANGLE to Metal on Mac OS X. The same shader works fine via OpenGL ES directly (Mac OS X without ANGLE to Metal). Also, the same shader works fine for ANGLE to DirectX (Windows 10). Something goes wrong when trying to link the shader via ANGLE to Metal!? **** VERTEX SHADER PART: #ifdef GL_ES precision mediump float; #define TEXP mediump #define COLP lowp #else #define TEXP #define COLP #endif attribute vec4 a_pos; attribute TEXP vec2 a_tex_uv; attribute COLP vec4 a_col; varying TEXP vec2 v_tex_uv; varying COLP vec4 v_col; void main() { gl_Position = a_pos; v_tex_uv = a_tex_uv; v_col = a_col; } **** FRAGMENT SHADER PART: #ifdef GL_ES precision mediump float; #define TEXP mediump #define COLP lowp #else #define TEXP #define COLP #endif uniform sampler2D s_tex; uniform float u_val; varying TEXP vec2 v_tex_uv; varying COLP vec4 v_col; void main() { gl_FragColor = texture2D(s_tex, v_tex_uv); gl_FragColor *= v_col; } \