etnaviv: Cannot render to rb-swapped formats

Exposing rb swapped (or other swizzled) formats for rendering would
involve swizzing in the pixel shader. This is not the case at the
moment, so reject requests for creating such surfaces.

(GPUs that need an extra resolve step anyway due to multiple pixel
pipes, such as gc2000, might also do this swap in the resolve operation.
But this would be tricky to keep track of)

CC: <[email protected]>
Signed-off-by: Wladimir J. van der Laan <[email protected]>
Acked-by: Christian Gmeiner <[email protected]>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/gallium/drivers/etnaviv/etnaviv_screen.c b/src/gallium/drivers/etnaviv/etnaviv_screen.c
index c045f7e0721..7c1609f5b72 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_screen.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_screen.c
@@ -471,8 +471,11 @@ etna_screen_is_format_supported(struct pipe_screen *pscreen,
       return FALSE;
 
    if (usage & PIPE_BIND_RENDER_TARGET) {
-      /* if render target, must be RS-supported format */
-      if (translate_rs_format(format) != ETNA_NO_MATCH) {
+      /* If render target, must be RS-supported format that is not rb swapped.
+       * Exposing rb swapped (or other swizzled) formats for rendering would
+       * involve swizzing in the pixel shader.
+       */
+      if (translate_rs_format(format) != ETNA_NO_MATCH && !translate_rs_format_rb_swap(format)) {
          /* Validate MSAA; number of samples must be allowed, and render target
           * must have MSAA'able format. */
          if (sample_count > 1) {