1 files changed, 49 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_tex.c b/src/mesa/drivers/dri/intel/intel_tex.c
index df63f29a42..215a534a5c 100644
--- a/src/mesa/drivers/dri/intel/intel_tex.c
+++ b/src/mesa/drivers/dri/intel/intel_tex.c
@@ -2,6 +2,7 @@
 #include "main/texobj.h"
 #include "main/teximage.h"
 #include "main/mipmap.h"
+#include "drivers/common/meta.h"
 #include "intel_context.h"
 #include "intel_mipmap_tree.h"
 #include "intel_tex.h"
@@ -158,11 +159,58 @@ timed_memcpy(void *dest, const void *src, size_t n)
 }
 #endif /* DO_DEBUG */
 
+
+/**
+ * Called via ctx->Driver.GenerateMipmap()
+ * This is basically a wrapper for _mesa_meta_GenerateMipmap() which checks
+ * if we'll be using software mipmap generation.  In that case, we need to
+ * map/unmap the base level texture image.
+ */
+static void
+intelGenerateMipmap(GLcontext *ctx, GLenum target,
+                    struct gl_texture_object *texObj)
+{
+   if (_mesa_meta_check_generate_mipmap_fallback(ctx, target, texObj)) {
+      /* sw path: need to map texture images */
+      struct intel_context *intel = intel_context(ctx);
+      struct intel_texture_object *intelObj = intel_texture_object(texObj);
+      intel_tex_map_level_images(intel, intelObj, texObj->BaseLevel);
+      _mesa_generate_mipmap(ctx, target, texObj);
+      intel_tex_unmap_level_images(intel, intelObj, texObj->BaseLevel);
+
+      {
+         GLuint nr_faces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
+         GLuint face, i;
+         /* Update the level information in our private data in the new images,
+          * since it didn't get set as part of a normal TexImage path.
+          */
+         for (face = 0; face < nr_faces; face++) {
+            for (i = texObj->BaseLevel + 1; i < texObj->MaxLevel; i++) {
+               struct intel_texture_image *intelImage =
+                  intel_texture_image(texObj->Image[face][i]);
+               if (!intelImage)
+                  break;
+               intelImage->level = i;
+               intelImage->face = face;
+               /* Unreference the miptree to signal that the new Data is a
+                * bare pointer from mesa.
+                */
+               intel_miptree_release(intel, &intelImage->mt);
+            }
+         }
+      }
+   }
+   else {
+      _mesa_meta_GenerateMipmap(ctx, target, texObj);
+   }
+}
+
+
 void
 intelInitTextureFuncs(struct dd_function_table *functions)
 {
    functions->ChooseTextureFormat = intelChooseTextureFormat;
-   functions->GenerateMipmap = intel_generate_mipmap;
+   functions->GenerateMipmap = intelGenerateMipmap;
 
    functions->NewTextureObject = intelNewTextureObject;
    functions->NewTextureImage = intelNewTextureImage;