java - OpenGL Drawing to multiple textures -

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i'm trying draw scene's data multiple textures. textures hold diffuse, normal, , position in color form. when scene rendered 1 of textures drawn to. gl_fragdata[0] ends in texture attachment gl_color_attachment2. if switch gl_fragdata[0] diffuse, normal. or position gl_color_attachment2 texture has data correct know data correct in shader first 2 textures end blank.

int fbo = glgenframebuffer(); glbindframebuffer(gl_framebuffer, fbo); addtextureattachment(gl_color_attachment0); addtextureattachment(gl_color_attachment1); addtextureattachment(gl_color_attachment2); material.unbindalltextures();  public void addtextureattachment(int attachment) {     int id = glgentextures();     glbindtexture(gl_texture_2d, id);     glteximage2d(gl_texture_2d, 0, gl_rgba, width, height, 0, gl_rgba, gl_unsigned_byte, (bytebuffer)null);     gltexparameteri(gl_texture_2d, gl_texture_mag_filter, gl_linear);     gltexparameteri(gl_texture_2d, gl_texture_min_filter, gl_linear);     glframebuffertexture2d(gl_framebuffer, attachment, gl_texture_2d, id, 0);     textures.add(new texture(id, width, height)); }

i call before rendering

public void bindasrendertarget() {     glbindtexture(gl_texture_2d, 0);     glbindframebuffer(gl_framebuffer, fbo);     glviewport(0, 0, width, height);     gldrawbuffers(gl_color_attachment0);     gldrawbuffers(gl_color_attachment1);     gldrawbuffers(gl_color_attachment2); }

i have solved issue. when calling gldrawbuffers 3 times needed call different gldrawbuffers takes in bytebuffer containing int gl_color_attachment 0, 1, , 2 this:

    bytebuffer buffer = bufferutils.createbytebuffer(3 * 4);     buffer.putint(gl_color_attachment0);     buffer.putint(gl_color_attachment1);     buffer.putint(gl_color_attachment2);     buffer.flip();      gldrawbuffers(3, buffer);

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