6 files changed, 23 insertions, 9 deletions

diff --git a/src/mesa/main/ff_fragment_shader.cpp b/src/mesa/main/ff_fragment_shader.cpp
index bc6fdbdd891..c6828925f5e 100644
--- a/src/mesa/main/ff_fragment_shader.cpp
+++ b/src/mesa/main/ff_fragment_shader.cpp
@@ -418,7 +418,7 @@ static GLuint make_state_key( struct gl_context *ctx,  struct state_key *key )
          continue;
 
       samp = _mesa_get_samplerobj(ctx, i);
-      format = texObj->Image[0][texObj->BaseLevel]->_BaseFormat;
+      format = _mesa_texture_base_format(texObj);
 
       key->unit[i].enabled = 1;
       key->enabled_units |= (1<<i);
diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c
index f0ff605fc50..d199bd7fdb5 100644
--- a/src/mesa/main/texobj.c
+++ b/src/mesa/main/texobj.c
@@ -954,6 +954,20 @@ _mesa_total_texture_memory(struct gl_context *ctx)
 }
 
 
+/**
+ * Return the base format for the given texture object by looking
+ * at the base texture image.
+ * \return base format (such as GL_RGBA) or GL_NONE if it can't be determined
+ */
+GLenum
+_mesa_texture_base_format(const struct gl_texture_object *texObj)
+{
+   const struct gl_texture_image *texImage = _mesa_base_tex_image(texObj);
+
+   return texImage ? texImage->_BaseFormat : GL_NONE;
+}
+
+
 static struct gl_texture_object *
 invalidate_tex_image_error_check(struct gl_context *ctx, GLuint texture,
                                  GLint level, const char *name)
diff --git a/src/mesa/main/texobj.h b/src/mesa/main/texobj.h
index efcd7661e26..f33991dd2d6 100644
--- a/src/mesa/main/texobj.h
+++ b/src/mesa/main/texobj.h
@@ -165,6 +165,9 @@ _mesa_get_fallback_texture(struct gl_context *ctx, gl_texture_index tex);
 extern GLuint
 _mesa_total_texture_memory(struct gl_context *ctx);
 
+extern GLenum
+_mesa_texture_base_format(const struct gl_texture_object *texObj);
+
 extern void
 _mesa_unlock_context_textures( struct gl_context *ctx );
 
diff --git a/src/mesa/state_tracker/st_atom_sampler.c b/src/mesa/state_tracker/st_atom_sampler.c
index f8d7cd7f9b3..b68eb16d7be 100644
--- a/src/mesa/state_tracker/st_atom_sampler.c
+++ b/src/mesa/state_tracker/st_atom_sampler.c
@@ -134,7 +134,6 @@ convert_sampler(struct st_context *st,
    const struct gl_texture_object *texobj;
    struct gl_context *ctx = st->ctx;
    struct gl_sampler_object *msamp;
-   const struct gl_texture_image *teximg;
    GLenum texBaseFormat;
 
    texobj = ctx->Texture.Unit[texUnit]._Current;
@@ -142,8 +141,7 @@ convert_sampler(struct st_context *st,
       texobj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);
    }
 
-   teximg = _mesa_base_tex_image_const(texobj);
-   texBaseFormat = teximg ? teximg->_BaseFormat : GL_RGBA;
+   texBaseFormat = _mesa_texture_base_format(texobj);
 
    msamp = _mesa_get_samplerobj(ctx, texUnit);
 
diff --git a/src/mesa/state_tracker/st_atom_texture.c b/src/mesa/state_tracker/st_atom_texture.c
index c95e36abc0f..eff28fc6f37 100644
--- a/src/mesa/state_tracker/st_atom_texture.c
+++ b/src/mesa/state_tracker/st_atom_texture.c
@@ -176,12 +176,11 @@ compute_texture_format_swizzle(GLenum baseFormat, GLenum depthMode,
 static unsigned
 get_texture_format_swizzle(const struct st_texture_object *stObj)
 {
-   const struct gl_texture_image *texImage =
-      _mesa_base_tex_image_const(&stObj->base);
+   GLenum baseFormat = _mesa_texture_base_format(&stObj->base);
    unsigned tex_swizzle;
 
-   if (texImage) {
-      tex_swizzle = compute_texture_format_swizzle(texImage->_BaseFormat,
+   if (baseFormat != GL_NONE) {
+      tex_swizzle = compute_texture_format_swizzle(baseFormat,
                                                    stObj->base.DepthMode,
                                                    stObj->pt->format);
    }
diff --git a/src/mesa/swrast/s_texfilter.c b/src/mesa/swrast/s_texfilter.c
index 8a1b045c2ff..fa79fdc5b49 100644
--- a/src/mesa/swrast/s_texfilter.c
+++ b/src/mesa/swrast/s_texfilter.c
@@ -833,7 +833,7 @@ apply_depth_mode(GLenum depthMode, GLfloat z, GLfloat texel[4])
 static GLboolean
 is_depth_texture(const struct gl_texture_object *tObj)
 {
-   GLenum format = tObj->Image[0][tObj->BaseLevel]->_BaseFormat;
+   GLenum format = _mesa_texture_base_format(tObj);
    return format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT;
 }