Merge remote-tracking branch 'origin/released'

* origin/released:
  libxtrans mesa pixman xkeyboard-config git update 31 jan 2013

18 files changed, 167 insertions, 96 deletions

diff --git a/mesalib/src/mapi/glapi/gen/ARB_texture_buffer_range.xml b/mesalib/src/mapi/glapi/gen/ARB_texture_buffer_range.xml
new file mode 100644
index 000000000..2176c08ef
--- /dev/null
+++ b/mesalib/src/mapi/glapi/gen/ARB_texture_buffer_range.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0"?>
+<!DOCTYPE OpenGLAPI SYSTEM "gl_API.dtd">
+
+<OpenGLAPI>
+
+<category name="GL_ARB_texture_buffer_range" number="139">
+
+    <enum name="TEXTURE_BUFFER_OFFSET"                  value="0x919D"/>
+    <enum name="TEXTURE_BUFFER_SIZE"                    value="0x919E"/>
+    <enum name="TEXTURE_BUFFER_OFFSET_ALIGNMENT"        value="0x919F"/>
+
+    <function name="TexBufferRange" offset="assign">
+        <param name="target" type="GLenum"/>
+        <param name="internalformat" type="GLenum"/>
+        <param name="buffer" type="GLuint"/>
+        <param name="offset" type="GLintptr"/>
+        <param name="size" type="GLsizeiptr"/>
+    </function>
+
+</category>
+
+</OpenGLAPI>
diff --git a/mesalib/src/mapi/glapi/gen/Makefile.am b/mesalib/src/mapi/glapi/gen/Makefile.am
index f869d28e5..4d51bbca6 100644
--- a/mesalib/src/mapi/glapi/gen/Makefile.am
+++ b/mesalib/src/mapi/glapi/gen/Makefile.am
@@ -108,6 +108,7 @@ API_XML = \
 	ARB_seamless_cube_map.xml \
 	ARB_sync.xml \
 	ARB_texture_buffer_object.xml \
+	ARB_texture_buffer_range.xml \
 	ARB_texture_compression_rgtc.xml \
 	ARB_texture_float.xml \
 	ARB_texture_rg.xml \
diff --git a/mesalib/src/mapi/glapi/gen/gl_API.xml b/mesalib/src/mapi/glapi/gen/gl_API.xml
index 11d6a8366..a3e1351b5 100755
--- a/mesalib/src/mapi/glapi/gen/gl_API.xml
+++ b/mesalib/src/mapi/glapi/gen/gl_API.xml
@@ -8316,6 +8316,10 @@
 
 <xi:include href="ARB_invalidate_subdata.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
 
+<!-- ARB extensions #133...#138 -->
+
+<xi:include href="ARB_texture_buffer_range.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
+
 <!-- Non-ARB extensions sorted by extension number. -->
 
 <category name="GL_EXT_blend_color" number="2">
diff --git a/mesalib/src/mesa/drivers/common/driverfuncs.c b/mesalib/src/mesa/drivers/common/driverfuncs.c
index cf6b686dd..aab61e1a4 100644
--- a/mesalib/src/mesa/drivers/common/driverfuncs.c
+++ b/mesalib/src/mesa/drivers/common/driverfuncs.c
@@ -75,7 +75,6 @@ _mesa_init_driver_functions(struct dd_function_table *driver)
    driver->UpdateState = NULL;  /* REQUIRED! */
    driver->GetBufferSize = NULL;  /* REQUIRED! */
    driver->ResizeBuffers = _mesa_resize_framebuffer;
-   driver->Error = NULL;
 
    driver->Finish = NULL;
    driver->Flush = NULL;
diff --git a/mesalib/src/mesa/main/APIspec.dtd b/mesalib/src/mesa/main/APIspec.dtd
deleted file mode 100644
index efcfa31f1..000000000
--- a/mesalib/src/mesa/main/APIspec.dtd
+++ /dev/null
@@ -1,52 +0,0 @@
-<!ELEMENT apispec (template|api)+>
-
-<!ELEMENT api (category*, function*)>
-<!ELEMENT category EMPTY>
-<!ELEMENT function EMPTY>
-
-<!ELEMENT template (proto, desc*)>
-<!ELEMENT proto (return, (param|vector)*)>
-<!ELEMENT return EMPTY>
-<!ELEMENT param EMPTY>
-<!ELEMENT vector (param*)>
-<!ELEMENT desc ((value|range)*, desc*)>
-<!ELEMENT value EMPTY>
-<!ELEMENT range EMPTY>
-
-<!ATTLIST api      name                NMTOKEN #REQUIRED
-                   implementation      (true | false) "false">
-<!ATTLIST category name                NMTOKEN #REQUIRED>
-<!ATTLIST function name                NMTOKEN #REQUIRED
-                   default_prefix      NMTOKEN "_mesa_"
-                   external            (true | false) "false"
-                   template            NMTOKEN #REQUIRED
-                   gltype              CDATA #IMPLIED
-                   vector_size         NMTOKEN #IMPLIED
-                   expand_vector       (true | false) "false"
-                   skip_desc           (true | false) "false">
-
-<!ATTLIST template name                NMTOKEN #REQUIRED
-                   direction           (set | get) "set">
-
-<!ATTLIST return   type                CDATA #REQUIRED>
-<!ATTLIST param    name                NMTOKEN #REQUIRED
-                   type                CDATA #REQUIRED
-                   hide_if_expanded    (true | false) "false"
-                   category            NMTOKEN #IMPLIED>
-<!ATTLIST vector   name                NMTOKEN #REQUIRED
-                   type                CDATA #REQUIRED
-                   size                NMTOKEN #REQUIRED
-                   category            NMTOKEN #IMPLIED>
-
-<!ATTLIST desc     name                NMTOKEN #REQUIRED
-                   vector_size         CDATA #IMPLIED
-                   convert             (true | false) #IMPLIED
-                   error               NMTOKEN "GL_INVALID_ENUM"
-                   category            NMTOKEN #IMPLIED>
-
-<!ATTLIST value    name                CDATA #REQUIRED
-                   category            NMTOKEN #IMPLIED>
-<!ATTLIST range    from                NMTOKEN #REQUIRED
-                   to                  NMTOKEN #REQUIRED
-                   base                NMTOKEN #IMPLIED
-                   category            NMTOKEN #IMPLIED>
diff --git a/mesalib/src/mesa/main/context.c b/mesalib/src/mesa/main/context.c
index 5e9e539b2..e5ed97f00 100644
--- a/mesalib/src/mesa/main/context.c
+++ b/mesalib/src/mesa/main/context.c
@@ -564,6 +564,7 @@ _mesa_init_constants(struct gl_context *ctx)
    ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
    ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
    ctx->Const.MaxTextureBufferSize = 65536;
+   ctx->Const.TextureBufferOffsetAlignment = 1;
    ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
    ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
    ctx->Const.MinPointSize = MIN_POINT_SIZE;
@@ -1663,11 +1664,6 @@ _mesa_record_error(struct gl_context *ctx, GLenum error)
    if (ctx->ErrorValue == GL_NO_ERROR) {
       ctx->ErrorValue = error;
    }
-
-   /* Call device driver's error handler, if any.  This is used on the Mac. */
-   if (ctx->Driver.Error) {
-      ctx->Driver.Error(ctx);
-   }
 }
 
 
diff --git a/mesalib/src/mesa/main/dd.h b/mesalib/src/mesa/main/dd.h
index f91fd4120..9a75fd954 100644
--- a/mesalib/src/mesa/main/dd.h
+++ b/mesalib/src/mesa/main/dd.h
@@ -109,12 +109,6 @@ struct dd_function_table {
                           GLuint width, GLuint height);
 
    /**
-    * Called whenever an error is generated.  
-    * __struct gl_contextRec::ErrorValue contains the error value.
-    */
-   void (*Error)( struct gl_context *ctx );
-
-   /**
     * This is called whenever glFinish() is called.
     */
    void (*Finish)( struct gl_context *ctx );
diff --git a/mesalib/src/mesa/main/extensions.c b/mesalib/src/mesa/main/extensions.c
index 7ae07fb5a..c9638a1af 100644
--- a/mesalib/src/mesa/main/extensions.c
+++ b/mesalib/src/mesa/main/extensions.c
@@ -131,6 +131,7 @@ static const struct extension extension_table[] = {
    { "GL_ARB_texture_border_clamp",                o(ARB_texture_border_clamp),                GLL,            2000 },
    { "GL_ARB_texture_buffer_object",               o(ARB_texture_buffer_object),               GLC,            2008 },
    { "GL_ARB_texture_buffer_object_rgb32",         o(ARB_texture_buffer_object_rgb32),         GLC,            2009 },
+   { "GL_ARB_texture_buffer_range",                o(ARB_texture_buffer_range),                GLC,            2012 },
    { "GL_ARB_texture_compression",                 o(dummy_true),                              GLL,            2000 },
    { "GL_ARB_texture_compression_rgtc",            o(ARB_texture_compression_rgtc),            GL,             2004 },
    { "GL_ARB_texture_cube_map",                    o(ARB_texture_cube_map),                    GLL,            1999 },
@@ -418,7 +419,6 @@ _mesa_enable_sw_extensions(struct gl_context *ctx)
    ctx->Extensions.EXT_fog_coord = GL_TRUE;
    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
-   ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
    ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
    ctx->Extensions.EXT_point_parameters = GL_TRUE;
diff --git a/mesalib/src/mesa/main/formats.c b/mesalib/src/mesa/main/formats.c
index 47a1d6802..1c9e63377 100644
--- a/mesalib/src/mesa/main/formats.c
+++ b/mesalib/src/mesa/main/formats.c
@@ -2649,7 +2649,7 @@ _mesa_format_to_type_and_comps(gl_format format,
 }
 
 /**
- * Check if a gl_format exactly matches a GL formaat/type combination
+ * Check if a gl_format exactly matches a GL format/type combination
  * such that we can use memcpy() from one to the other.
  * \param gl_format  a MESA_FORMAT_x value
  * \param format  the user-specified image format
diff --git a/mesalib/src/mesa/main/get.c b/mesalib/src/mesa/main/get.c
index 5f4e2fa51..da1e01cb5 100644
--- a/mesalib/src/mesa/main/get.c
+++ b/mesalib/src/mesa/main/get.c
@@ -353,6 +353,7 @@ EXTRA_EXT(ARB_uniform_buffer_object);
 EXTRA_EXT(ARB_timer_query);
 EXTRA_EXT(ARB_map_buffer_alignment);
 EXTRA_EXT(ARB_texture_cube_map_array);
+EXTRA_EXT(ARB_texture_buffer_range);
 
 static const int
 extra_NV_primitive_restart[] = {
diff --git a/mesalib/src/mesa/main/get_hash_params.py b/mesalib/src/mesa/main/get_hash_params.py
index 26a722a87..b6bed809c 100644
--- a/mesalib/src/mesa/main/get_hash_params.py
+++ b/mesalib/src/mesa/main/get_hash_params.py
@@ -701,6 +701,12 @@ descriptor=[
 
 # GL_ARB_texture_cube_map_array
   [ "TEXTURE_BINDING_CUBE_MAP_ARRAY_ARB", "LOC_CUSTOM, TYPE_INT, TEXTURE_CUBE_ARRAY_INDEX, extra_ARB_texture_cube_map_array" ],
+]},
+
+# Enums restricted to OpenGL Core profile
+{ "apis": ["GL_CORE"], "params": [
+# GL_ARB_texture_buffer_range
+  [ "TEXTURE_BUFFER_OFFSET_ALIGNMENT", "CONTEXT_INT(Const.TextureBufferOffsetAlignment), extra_ARB_texture_buffer_range" ],
 ]}
 
 ]
diff --git a/mesalib/src/mesa/main/glformats.c b/mesalib/src/mesa/main/glformats.c
index 6160d8ecd..8728540cf 100644
--- a/mesalib/src/mesa/main/glformats.c
+++ b/mesalib/src/mesa/main/glformats.c
@@ -1485,18 +1485,8 @@ _mesa_error_check_format_and_type(const struct gl_context *ctx,
          else if (ctx->Extensions.ARB_depth_buffer_float &&
              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV)
             return GL_NO_ERROR;
-         switch (type) {
-         case GL_BYTE:
-         case GL_UNSIGNED_BYTE:
-         case GL_SHORT:
-         case GL_UNSIGNED_SHORT:
-         case GL_INT:
-         case GL_UNSIGNED_INT:
-         case GL_FLOAT:
-            return GL_INVALID_OPERATION;
-         default:
+         else
             return GL_INVALID_ENUM;
-         }
 
       case GL_DUDV_ATI:
       case GL_DU8DV8_ATI:
diff --git a/mesalib/src/mesa/main/mtypes.h b/mesalib/src/mesa/main/mtypes.h
index 3369623f7..b92f98e7d 100644
--- a/mesalib/src/mesa/main/mtypes.h
+++ b/mesalib/src/mesa/main/mtypes.h
@@ -1295,6 +1295,9 @@ struct gl_texture_object
    GLenum BufferObjectFormat;
    /** Equivalent Mesa format for BufferObjectFormat. */
    gl_format _BufferObjectFormat;
+   /** GL_ARB_texture_buffer_range */
+   GLintptr BufferOffset;
+   GLsizeiptr BufferSize; /**< if this is -1, use BufferObject->Size instead */
 
    /** GL_OES_EGL_image_external */
    GLint RequiredTextureImageUnits;
@@ -2851,6 +2854,8 @@ struct gl_constants
    GLfloat MaxTextureLodBias;        /**< GL_EXT_texture_lod_bias */
    GLuint MaxTextureBufferSize;      /**< GL_ARB_texture_buffer_object */
 
+   GLuint TextureBufferOffsetAlignment; /**< GL_ARB_texture_buffer_range */
+
    GLuint MaxArrayLockSize;
 
    GLint SubPixelBits;
@@ -3075,6 +3080,7 @@ struct gl_extensions
    GLboolean ARB_texture_border_clamp;
    GLboolean ARB_texture_buffer_object;
    GLboolean ARB_texture_buffer_object_rgb32;
+   GLboolean ARB_texture_buffer_range;
    GLboolean ARB_texture_compression_rgtc;
    GLboolean ARB_texture_cube_map;
    GLboolean ARB_texture_cube_map_array;
diff --git a/mesalib/src/mesa/main/teximage.c b/mesalib/src/mesa/main/teximage.c
index 31a559e9d..f03e84ad8 100644
--- a/mesalib/src/mesa/main/teximage.c
+++ b/mesalib/src/mesa/main/teximage.c
@@ -3994,23 +3994,16 @@ validate_texbuffer_format(const struct gl_context *ctx, GLenum internalFormat)
 }
 
 
-/** GL_ARB_texture_buffer_object */
-void GLAPIENTRY
-_mesa_TexBuffer(GLenum target, GLenum internalFormat, GLuint buffer)
+static void
+texbufferrange(struct gl_context *ctx, GLenum target, GLenum internalFormat,
+               struct gl_buffer_object *bufObj,
+               GLintptr offset, GLsizeiptr size)
 {
    struct gl_texture_object *texObj;
-   struct gl_buffer_object *bufObj;
    gl_format format;
 
-   GET_CURRENT_CONTEXT(ctx);
    FLUSH_VERTICES(ctx, 0);
 
-   if (!(ctx->API == API_OPENGL_CORE &&
-         ctx->Extensions.ARB_texture_buffer_object)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBuffer");
-      return;
-   }
-
    if (target != GL_TEXTURE_BUFFER_ARB) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glTexBuffer(target)");
       return;
@@ -4023,12 +4016,6 @@ _mesa_TexBuffer(GLenum target, GLenum internalFormat, GLuint buffer)
       return;
    }
 
-   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
-   if (buffer && !bufObj) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBuffer(buffer %u)", buffer);
-      return;
-   }
-
    texObj = _mesa_get_current_tex_object(ctx, target);
 
    _mesa_lock_texture(ctx, texObj);
@@ -4036,6 +4023,74 @@ _mesa_TexBuffer(GLenum target, GLenum internalFormat, GLuint buffer)
       _mesa_reference_buffer_object(ctx, &texObj->BufferObject, bufObj);
       texObj->BufferObjectFormat = internalFormat;
       texObj->_BufferObjectFormat = format;
+      texObj->BufferOffset = offset;
+      texObj->BufferSize = size;
    }
    _mesa_unlock_texture(ctx, texObj);
 }
+
+/** GL_ARB_texture_buffer_object */
+void GLAPIENTRY
+_mesa_TexBuffer(GLenum target, GLenum internalFormat, GLuint buffer)
+{
+   struct gl_buffer_object *bufObj;
+
+   GET_CURRENT_CONTEXT(ctx);
+
+   /* NOTE: ARB_texture_buffer_object has interactions with
+    * the compatibility profile that are not implemented.
+    */
+   if (!(ctx->API == API_OPENGL_CORE &&
+         ctx->Extensions.ARB_texture_buffer_object)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBuffer");
+      return;
+   }
+
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (!bufObj && buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBuffer(buffer %u)", buffer);
+      return;
+   }
+
+   texbufferrange(ctx, target, internalFormat, bufObj, 0, buffer ? -1 : 0);
+}
+
+/** GL_ARB_texture_buffer_range */
+void GLAPIENTRY
+_mesa_TexBufferRange(GLenum target, GLenum internalFormat, GLuint buffer,
+                     GLintptr offset, GLsizeiptr size)
+{
+   struct gl_buffer_object *bufObj;
+
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (!(ctx->API == API_OPENGL_CORE &&
+         ctx->Extensions.ARB_texture_buffer_range)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBufferRange");
+      return;
+   }
+
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (bufObj) {
+      if (offset < 0 ||
+          size <= 0 ||
+          (offset + size) > bufObj->Size) {
+         _mesa_error(ctx, GL_INVALID_VALUE, "glTexBufferRange");
+         return;
+      }
+      if (offset % ctx->Const.TextureBufferOffsetAlignment) {
+         _mesa_error(ctx, GL_INVALID_VALUE,
+                     "glTexBufferRange(invalid offset alignment)");
+         return;
+      }
+   } else if (buffer) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBufferRange(buffer %u)",
+                  buffer);
+      return;
+   } else {
+      offset = 0;
+      size = 0;
+   }
+
+   texbufferrange(ctx, target, internalFormat, bufObj, offset, size);
+}
diff --git a/mesalib/src/mesa/main/teximage.h b/mesalib/src/mesa/main/teximage.h
index 65e933371..7124cac52 100644
--- a/mesalib/src/mesa/main/teximage.h
+++ b/mesalib/src/mesa/main/teximage.h
@@ -289,6 +289,10 @@ _mesa_CompressedTexSubImage3D(GLenum target, GLint level, GLint xoffset,
 extern void GLAPIENTRY
 _mesa_TexBuffer(GLenum target, GLenum internalFormat, GLuint buffer);
 
+extern void GLAPIENTRY
+_mesa_TexBufferRange(GLenum target, GLenum internalFormat, GLuint buffer,
+                     GLintptr offset, GLsizeiptr size);
+
 
 /*@}*/
 
diff --git a/mesalib/src/mesa/main/texparam.c b/mesalib/src/mesa/main/texparam.c
index 52ede13c0..b6afd35ba 100644
--- a/mesalib/src/mesa/main/texparam.c
+++ b/mesalib/src/mesa/main/texparam.c
@@ -1181,6 +1181,18 @@ get_tex_level_parameter_buffer(struct gl_context *ctx,
          *params = _mesa_get_format_bits(texFormat, pname);
          break;
 
+      /* GL_ARB_texture_buffer_range */
+      case GL_TEXTURE_BUFFER_OFFSET:
+         if (!ctx->Extensions.ARB_texture_buffer_range)
+            goto invalid_pname;
+         *params = texObj->BufferOffset;
+         break;
+      case GL_TEXTURE_BUFFER_SIZE:
+         if (!ctx->Extensions.ARB_texture_buffer_range)
+            goto invalid_pname;
+         *params = (texObj->BufferSize == -1) ? bo->Size : texObj->BufferSize;
+         break;
+
       /* GL_ARB_texture_compression */
       case GL_TEXTURE_COMPRESSED_IMAGE_SIZE:
          /* Always illegal for GL_TEXTURE_BUFFER */
diff --git a/mesalib/src/mesa/state_tracker/st_atom_texture.c b/mesalib/src/mesa/state_tracker/st_atom_texture.c
index dba1d829c..4b43b2a7d 100644
--- a/mesalib/src/mesa/state_tracker/st_atom_texture.c
+++ b/mesalib/src/mesa/state_tracker/st_atom_texture.c
@@ -152,7 +152,27 @@ st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
    u_sampler_view_default_template(&templ,
                                    stObj->pt,
                                    format);
-   templ.u.tex.first_level = stObj->base.BaseLevel;
+
+   if (stObj->pt->target == PIPE_BUFFER) {
+      unsigned base, size;
+      unsigned f, n;
+      const struct util_format_description *desc
+         = util_format_description(templ.format);
+
+      base = stObj->base.BufferOffset;
+      if (base >= stObj->pt->width0)
+         return NULL;
+      size = MIN2(stObj->pt->width0 - base, (unsigned)stObj->base.BufferSize);
+
+      f = ((base * 8) / desc->block.bits) * desc->block.width;
+      n = ((size * 8) / desc->block.bits) * desc->block.width;
+      if (!n)
+         return NULL;
+      templ.u.buf.first_element = f;
+      templ.u.buf.last_element  = f + (n - 1);
+   } else {
+      templ.u.tex.first_level = stObj->base.BaseLevel;
+   }
 
    if (swizzle != SWIZZLE_NOOP) {
       templ.swizzle_r = GET_SWZ(swizzle, 0);
diff --git a/mesalib/src/mesa/state_tracker/st_extensions.c b/mesalib/src/mesa/state_tracker/st_extensions.c
index af54cf7c8..214588f1f 100644
--- a/mesalib/src/mesa/state_tracker/st_extensions.c
+++ b/mesalib/src/mesa/state_tracker/st_extensions.c
@@ -534,7 +534,6 @@ void st_init_extensions(struct st_context *st)
    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
-   ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
    ctx->Extensions.EXT_fog_coord = GL_TRUE;
    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
@@ -653,6 +652,13 @@ void st_init_extensions(struct st_context *st)
          break;
       }
    }
+   if (ctx->Const.MaxSamples == 1) {
+      /* one sample doesn't really make sense */
+      ctx->Const.MaxSamples = 0;
+   }
+   else if (ctx->Const.MaxSamples >= 2) {
+      ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
+   }
 
    if (ctx->Const.MaxDualSourceDrawBuffers > 0)
       ctx->Extensions.ARB_blend_func_extended = GL_TRUE;
@@ -679,6 +685,13 @@ void st_init_extensions(struct st_context *st)
    }
    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS)) {
       ctx->Extensions.ARB_texture_buffer_object = GL_TRUE;
+
+      ctx->Const.TextureBufferOffsetAlignment =
+         screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT);
+
+      if (ctx->Const.TextureBufferOffsetAlignment)
+         ctx->Extensions.ARB_texture_buffer_range = GL_TRUE;
+
       init_format_extensions(st, tbo_rgb32, Elements(tbo_rgb32),
                              PIPE_BUFFER, PIPE_BIND_SAMPLER_VIEW);
    }