st/mesa: use the texture view's format for render-to-texture

Aside from the bug below, it fixes a simplistic test I've written locally,
and I see no regression in Piglit for radeonsi.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94595
Cc: "11.0 11.1 11.2" <[email protected]>
Reviewed-by: Ilia Mirkin <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 15 insertions, 7 deletions

diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index 82ab914503b..ff570e0e444 100644
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -387,6 +387,7 @@ st_update_renderbuffer_surface(struct st_context *st,
 {
    struct pipe_context *pipe = st->pipe;
    struct pipe_resource *resource = strb->texture;
+   struct st_texture_object *stTexObj = NULL;
    unsigned rtt_width = strb->Base.Width;
    unsigned rtt_height = strb->Base.Height;
    unsigned rtt_depth = strb->Base.Depth;
@@ -398,9 +399,18 @@ st_update_renderbuffer_surface(struct st_context *st,
     */
    boolean enable_srgb = (st->ctx->Color.sRGBEnabled &&
          _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB);
-   enum pipe_format format = (enable_srgb) ?
-      util_format_srgb(resource->format) :
-      util_format_linear(resource->format);
+   enum pipe_format format = resource->format;
+
+   if (strb->is_rtt) {
+      stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
+      if (stTexObj->surface_based)
+         format = stTexObj->surface_format;
+   }
+
+   format = (enable_srgb) ?
+      util_format_srgb(format) :
+      util_format_linear(format);
+
    unsigned first_layer, last_layer, level;
 
    if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
@@ -431,8 +441,8 @@ st_update_renderbuffer_surface(struct st_context *st,
 
    /* Adjust for texture views */
    if (strb->is_rtt && resource->array_size > 1 &&
-       strb->Base.TexImage->TexObject->Immutable) {
-      struct gl_texture_object *tex = strb->Base.TexImage->TexObject;
+       stTexObj->base.Immutable) {
+      struct gl_texture_object *tex = &stTexObj->base;
       first_layer += tex->MinLayer;
       if (!strb->rtt_layered)
          last_layer += tex->MinLayer;
@@ -492,8 +502,6 @@ st_render_texture(struct gl_context *ctx,
 
    st_update_renderbuffer_surface(st, strb);
 
-   strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);
-
    /* Invalidate buffer state so that the pipe's framebuffer state
     * gets updated.
     * That's where the new renderbuffer (which we just created) gets