update line test to expose some bug on SGX530 ed4

     glBindTexture(GL_TEXTURE_2D, 0);

     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

     glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

     glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

     glDisable(GL_DITHER);

     glDisable(GL_BLEND);

     glEnable(GL_TEXTURE_2D);

     glColor4f(1,1,1,1);

     const uint32_t t32[] = {

             0xFFFFFFFF, 0xFF0000FF, 0xFF00FF00, 0xFFFF0000,

             0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF, 0xFF000000

     };

     const uint16_t t16[64] = { 0xFFFF, 0xF800, 0x07E0, 0x001F };

     const GLfloat vertices[4][2] = {

             { 0,  0 },

             { w,  h }

             { w/2,  0 },

             { w/2,  h }

     };

     const GLfloat texCoords[4][2] = {

             { 0,  0 },

             { 1,  0 }

             { 1,  1 }

     };

     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 8, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, t32);

     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 4, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, t16);

     glViewport(0, 0, w, h);

     glMatrixMode(GL_PROJECTION);