c++ - OpenGLESv2 Shader glGetAttribLocation returns -1 -

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hey, try code opengl es 2 engine @ shader creation function glgetattriblocation returns -1 means

the named attribute variable not active attribute in specified program object or name starts reserved prefix "gl_".

but defined in shader , doesnt start gl_. whats wrong code?

c++ code:

glprogram = glcreateprogram();  glvertshader = glcreateshader(gl_vertex_shader); glfragshader = glcreateshader(gl_fragment_shader);  glshadersource(glvertshader, 1, vertsrc, null); glshadersource(glfragshader, 1, fragsrc, null);  glint ret;  glcompileshader(glvertshader); glgetshaderiv(glvertshader, gl_compile_status, &ret); if(!ret) {     ///error handling - stripped internet }  glcompileshader(glfragshader); glgetshaderiv(glfragshader, gl_compile_status, &ret); if(!ret) {     ///error handling - stripped internet }  glattachshader(glprogram, glvertshader); glattachshader(glprogram, glfragshader);  gllinkprogram(glprogram);  glgetprogramiv(glprogram, gl_link_status, &ret); if(!ret) {     ///error handling - stripped internet }  glattributes[0] = glgetattriblocation(glprogram, "vertex"); glattributes[1] = glgetattriblocation(glprogram, "texcoord_vs");    std::cout << "texcoord " << glgetattriblocation(glprogram, "texcoord_vs";

vert shader:

// vertex shader opengl es uniform mat4 projmat; uniform mat4 modviewmat;  attribute vec2 vertex; attribute vec2 texcoord_vs;  varying vec2 texcoord_fs;  void main() {     texcoord_fs = texcoord_vs;     gl_position = projmat*modviewmat*vec4(vertex, 0.0, 1.0); }

edit: correct shader code , error texcoord_vs.

you didn't specify attribute not used, assume it's "texcoord_vs", because you're not using it, , such it's being stripped shader compiler.

i suppose meant texcoord_fs = texcoord_vs?


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