c++ - OpenGL Textures are all black in 3.3 - but work in 3.1 -

i'm working on simple 3d scene in opengl3.3, when trying texture objects - of them textured entirely black. however, if change context version 3.1; has no problem rendering textures correctly on models.

i'm not sure if suggests i'm using deprecated functionality/methods, i'm struggling see problem be.

setting texture

(load texture file) ... glgentextures(1, &texid);               // create texture ( change ) glbindtexture(gl_texture_2d, texid);  glteximage2d(gl_texture_2d, 0, texture_bpp / 8, texture_width, texture_height, 0, texture_type, gl_unsigned_byte, texture_imagedata); gltexparameteri(gl_texture_2d, gl_texture_wrap_s, gl_repeat); gltexparameteri(gl_texture_2d, gl_texture_wrap_t, gl_repeat); gltexparameteri(gl_texture_2d,gl_texture_min_filter,gl_linear); gltexparameteri(gl_texture_2d,gl_texture_mag_filter,gl_linear); ... 

binding texture render

// mlocation layout location in shader, glgetuniformlocation // mtextureunit specified texture unit load into. using 0. // mtextureid id of loaded texture, generated above. glactivetexture( gl_texture0 + mdata.mtextureunit ); glbindtexture( gl_texture_2d, mdata.mtextureid ); gluniform1i( mlocation, mdata.mtextureunit ); 

fragment shader

uniform sampler2d diffusemap; in vec2 passuv; out vec3 outcolour; ... outcolour = texture( diffusemap, passuv ).rgb; 

all textures being used power of 2, square sizes.

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images showing problem.

gl3.1: http://i.imgur.com/nugj6va.png

gl3.3: http://i.imgur.com/ooc0jcd.png

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vertex shader

#version 330 core  uniform mat4 p; uniform mat4 v; uniform mat4 m;  in vec3 vertex; in vec3 normal; in vec2 uv;  out vec3 passvertex; out vec3 passnormal; out vec2 passuv;  void main( void ) {     gl_position = p * v * m * vec4( vertex, 1.0 );      passvertex = vec3( m * vec4( vertex, 1.0 ) );     passnormal = vec3( m * vec4( normal, 1.0 ) );     passuv = uv; } 

for sake of completeness, internal format of texture should enumerator. , 1 of sized enumerators, not 1 of unsized ones. please stop using gl_rgb when can use gl_rgb8.

answer correctly identifies issue, helpful have explained why previous assumption work on 3.1 , not on 3.3.

the ability use number on range [1, 4] deprecated in opengl 3.0 , removed in opengl 3.1. however, @ time, there wasn't way say, "give me actual core profile of opengl version 3.1"; wgl/glx_context_core_profile_bit_arbs didn't exist. therefore, when got 3.1 context, legal implementation export arb_compatibility extension, still allowed of removed functionality.

in 3.2, ability explicitly select profile added opengl. @ point, not exposing arb_compatibility in core profile. that's why code works when ask 3.1 (since it's free give 3.1 compatibility), not when ask 3.3 core profile.