java - LWJGL: Creating a semi Transparent Rectangle and then adding a Rectangle with a texture over it -


im trying what's described in title, heres code far create rect texture not semi transparent 1 should appear behind it:

public static void draw(){     glpushmatrix(); game.res.pausetexture.bind();   gl11.glcolor4f(0,0, 0 , 0.5f);  glbegin(gl11.gl_quads); {       glvertex2f(0, 0);        glvertex2f(game.winx,0 );       glvertex2f(game.winx, game.winy);       glvertex2f(0, game.winy); }  glend(); gl11.glcolor3f(1,1, 1);  gl11.gltranslatef(game.winx/2 - 250, game.winy/2 - 350, 0); gl11.gltexparameteri(gl11.gl_texture_2d, gl11.gl_texture_mag_filter, gl11.gl_nearest);   glbegin(gl11.gl_quads); {      gltexcoord2f(0, 0);     glvertex2f(0, 0);       gltexcoord2f(game.res.pausetexture.getwidth(), 0);     glvertex2f(500,0 );      gltexcoord2f(game.res.pausetexture.getwidth(), game.res.pausetexture.getheight());     glvertex2f(500, 700);      gltexcoord2f(0, game.res.pausetexture.getheight());     glvertex2f(0, 700); } glend(); glpopmatrix();

}

i happy if tell me solution this.

thanks

if understand question correctly, need enable blending , tell opengl blend using alpha channels.

so need add following initialize opengl states. can of course add rendering loop itself, though less use of opengl calls better.

glenable(gl_blend); glblendfunc(gl_src_alpha, gl_one_minus_src_alpha);

if have things don't want affected transparency/opacity need disable blending, so.

gldisable(gl_blend); ... render stuff ... glenable(gl_blend); ... render stuff ...

incase don't statically import different classes here same code though classes.

gl11.glenable(gl11.gl_blend); gl11.glblendfunc(gl11.gl_src_alpha, gl11.gl_one_minus_src_alpha); ... gl11.gldisable(gl11.gl_blend);

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