Hi,
I am using 5 points to draw a quad in opengles. Everithing is ok, but when I am trying to apply some transparency to this quad, using glColor4f the transparency/color is not uniform, I can clearly see the delimitation between the two triangles.
Is something wrong in my code?


GLfloat test_vertices[] = {
-1, -1, 0, // 1
1, -1, 0, // 2
-1, 1, 0, // 3
1, 1, 0, // 4
1, -1, 0 // 5(2)
};
for(i=0;i<15;i++)
test_vertices[i] *= aspect_ratio;

GLfloat test_uv[] = {
0, 1.0 - height_aspect_ratio,
width_aspect_ratio, 1.0 - height_aspect_ratio,
0, 1,
width_aspect_ratio, 1,
width_aspect_ratio, 1.0 - height_aspect_ratio
};

glVertexPointer ( 3, GL_FLOAT, 0, test_vertices );
glTexCoordPointer ( 2, GL_FLOAT, 0, test_uv );
glEnableClientState ( GL_VERTEX_ARRAY );
glEnableClientState ( GL_TEXTURE_COORD_ARRAY );

z_distance = (test_vertices[3] - test_vertices[0]) / 2.0f / tan(FOV/2*DEGREES_TO_RADIANS);

glLoadIdentity ();
glTranslatef ( 0, 0, -z_distance );

if(tex_buffer==0)
egl_createTextureFromFile( "test_img/fluture2.bmp", &tex_buffer );

glBindTexture ( GL_TEXTURE_2D, tex_buffer );
glCOlor4f ( 1.0f, 1.0f, 1.0f, 0.5f );
glDrawArrays ( GL_TRIANGLE_FAN, 0, 5 );

glDisableClientState( GL_TEXTURE_COORD_ARRAY );
glDisableClientState( GL_VERTEX_ARRAY );