[Mesa-dev] [PATCH 9/9] i965: Add a real native TexStorage path.

[Eric Anholt]

We originally had a path just did the loop and called
ctx->Driver.AllocTextureImageBuffer(), which I moved into Mesa core.  But
we can do better, avoiding incorrect miptree size guesses and later
texture validations by just directly allocating the miptree and setting it
to all the images.
---
 src/mesa/drivers/dri/i965/intel_tex.c | 65 +++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/intel_tex.c b/src/mesa/drivers/dri/i965/intel_tex.c
index eecffc9..5bc9d25 100644
--- a/src/mesa/drivers/dri/i965/intel_tex.c
+++ b/src/mesa/drivers/dri/i965/intel_tex.c
@@ -111,6 +111,70 @@ intel_alloc_texture_image_buffer(struct gl_context *ctx,
    return true;
 }
 
+/**
+ * ctx->Driver.AllocTextureStorage() handler.
+ *
+ * Compare this to _mesa_alloc_texture_storage, which would call into
+ * intel_alloc_texture_image_buffer() above.
+ */
+static GLboolean
+intel_alloc_texture_storage(struct gl_context *ctx,
+                            struct gl_texture_object *texobj,
+                            GLsizei levels, GLsizei width,
+                            GLsizei height, GLsizei depth)
+{
+   struct brw_context *brw = brw_context(ctx);
+   struct intel_texture_object *intel_texobj = intel_texture_object(texobj);
+   struct gl_texture_image *first_image = texobj->Image[0][0];
+   int num_samples = intel_quantize_num_samples(brw->intelScreen,
+                                                first_image->NumSamples);
+   const int numFaces = _mesa_num_tex_faces(texobj->Target);
+   int face;
+   int level;
+
+   printf("storage %d!\n", first_image->NumSamples);
+
+   /* If the object's current miptree doesn't match what we need, make a new
+    * one.
+    */
+   if (!intel_texobj->mt ||
+       !intel_miptree_match_image(intel_texobj->mt, first_image) ||
+       intel_texobj->mt->last_level != levels - 1) {
+      intel_miptree_release(&intel_texobj->mt);
+      intel_texobj->mt = intel_miptree_create(brw, texobj->Target,
+                                              first_image->TexFormat,
+                                              0, levels - 1,
+                                              width, height, depth,
+                                              false, /* expect_accelerated */
+                                              num_samples,
+                                              INTEL_MIPTREE_TILING_ANY);
+
+   }
+
+   for (face = 0; face < numFaces; face++) {
+      for (level = 0; level < levels; level++) {
+         struct gl_texture_image *image = texobj->Image[face][level];
+         struct intel_texture_image *intel_image = intel_texture_image(image);
+
+         image->NumSamples = num_samples;
+
+         _swrast_free_texture_image_buffer(ctx, image);
+         if (!_swrast_init_texture_image(image))
+            return false;
+
+         intel_miptree_reference(&intel_image->mt, intel_texobj->mt);
+      }
+   }
+
+   /* The miptree is in a validated state, so no need to check later. */
+   intel_texobj->needs_validate = false;
+   intel_texobj->validated_first_level = 0;
+   intel_texobj->validated_last_level = levels - 1;
+
+   return true;
+}
+
+
 static void
 intel_free_texture_image_buffer(struct gl_context * ctx,
 				struct gl_texture_image *texImage)
@@ -184,6 +248,7 @@ intelInitTextureFuncs(struct dd_function_table *functions)
    functions->DeleteTexture = intelDeleteTextureObject;
    functions->AllocTextureImageBuffer = intel_alloc_texture_image_buffer;
    functions->FreeTextureImageBuffer = intel_free_texture_image_buffer;
+   functions->AllocTextureStorage = intel_alloc_texture_storage;
    functions->MapTextureImage = intel_map_texture_image;
    functions->UnmapTextureImage = intel_unmap_texture_image;
 }
-- 
1.8.4.rc3