st/mesa: ignore gl_texture_object::BaseLevel when allocating gallium textures

Previously, when we created a gallium texture for a corresponding Mesa
texture we'd only allocate space for mipmap levels >= BaseLevel.

This patch undoes that mechanism.  This fixes a render-to-texture bug
when rendering to level 0 when BaseLevel=1.

Also, it makes sense to allocate the whole texture object memory when
BaseLevel > 0 since a common use of GL_TEXTURE_BASE_LEVEL is to
progressively load/render mipmaps.  Eventually, the app almost always
fills in the level=0 mipmap image.

Finally, the texture image code is bit easier to understand now.

1 files changed, 9 insertions, 3 deletions

diff --git a/src/mesa/state_tracker/st_texture.h b/src/mesa/state_tracker/st_texture.h
index d0298817de..447f091db1 100644
--- a/src/mesa/state_tracker/st_texture.h
+++ b/src/mesa/state_tracker/st_texture.h
@@ -38,6 +38,9 @@
 struct pipe_resource;
 
 
+/**
+ * Subclass of gl_texure_image.
+ */
 struct st_texture_image
 {
    struct gl_texture_image base;
@@ -57,7 +60,9 @@ struct st_texture_image
 };
 
 
-
+/**
+ * Subclass of gl_texure_object.
+ */
 struct st_texture_object
 {
    struct gl_texture_object base;       /* The "parent" object */
@@ -66,6 +71,9 @@ struct st_texture_object
     */
    GLuint lastLevel;
 
+   /** The size of the level=0 mipmap image */
+   GLuint width0, height0, depth0;
+
    /* On validation any active images held in main memory or in other
     * textures will be copied to this texture and the old storage freed.
     */
@@ -76,8 +84,6 @@ struct st_texture_object
     */
    struct pipe_sampler_view *sampler_view;
 
-   GLboolean teximage_realloc;
-
    /* True if there is/was a surface bound to this texture object.  It helps
     * track whether the texture object is surface based or not.
     */