st/mesa: Fix grabbing the wrong variant if glDrawPixels is called

By design pixel shaders can have up to 3 variants:
* The standard one.
* glDrawPixels variant.
* glBitmap variant.
However "shader_has_one_variant" ignores this fact, and therefore
st_update_fp would select the wrong variant if glDrawPixels or glBitmap
was ever called.

This patch fixes the problem. If the standard variant has been created,
calling glDrawPixels or glBitmap will append the variant to the second
entry of the linked list, so that st_update_fp still selects the right
one if shader_has_one_variant is set.

If the standard variant hasn't been created yet and glDrawPixel/Bitmap
has been called, st_update_fp will will see this and take the slow path
instead. The standard variant will then be added at the front of the
linked list, so that the next time the fast path is taken.

Blender in particular is hit by this bug.

v2: Marek - cosmetic changes

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=101596

Signed-off-by: Marek Olšák <[email protected]>

1 files changed, 19 insertions, 3 deletions

diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index 6b6d41536cf..41ebfa9003f 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -1248,9 +1248,25 @@ st_get_fp_variant(struct st_context *st,
       /* create new */
       fpv = st_create_fp_variant(st, stfp, key);
       if (fpv) {
-         /* insert into list */
-         fpv->next = stfp->variants;
-         stfp->variants = fpv;
+         if (key->bitmap || key->drawpixels) {
+            /* Regular variants should always come before the
+             * bitmap & drawpixels variants, (unless there
+             * are no regular variants) so that
+             * st_update_fp can take a fast path when
+             * shader_has_one_variant is set.
+             */
+            if (!stfp->variants) {
+               stfp->variants = fpv;
+            } else {
+               /* insert into list after the first one */
+               fpv->next = stfp->variants->next;
+               stfp->variants->next = fpv;
+            }
+         } else {
+            /* insert into list */
+            fpv->next = stfp->variants;
+            stfp->variants = fpv;
+         }
       }
    }