meta/blit: Track source texture using gl_texture_object instead of GL API object handle

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

src/mesa/drivers/common/meta.h

@@ -312,6 +312,7 @@ struct fb_tex_blit_state
    GLint baseLevelSave, maxLevelSave;
    struct gl_sampler_object *samp_obj;
    struct gl_sampler_object *samp_obj_save;
+   struct gl_texture_object *tex_obj;
    GLuint stencilSamplingSave;
    GLuint tempTex;
 };

src/mesa/drivers/common/meta_blit.c

@@ -694,6 +694,7 @@ blitframebuffer_texture(struct gl_context *ctx,
    }
 
    target = texObj->Target;
+   fb_tex_blit.tex_obj = texObj;
    fb_tex_blit.baseLevelSave = texObj->BaseLevel;
    fb_tex_blit.maxLevelSave = texObj->MaxLevel;
    fb_tex_blit.stencilSamplingSave = texObj->StencilSampling;