st/mesa: Allow ASTC5x5 fallbacks separately from other ASTC LDR formats.

This patch allows us to fake ASTC 5x5 specifically, while leaving the
other ASTC LDR formats with native support.  I plan to use this in iris,
at least for the time being.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/mesa/state_tracker/st_cb_texture.c

@@ -226,6 +226,18 @@ st_FreeTextureImageBuffer(struct gl_context *ctx,
    st_texture_release_all_sampler_views(st, stObj);
 }
 
+bool
+st_astc_format_fallback(const struct st_context *st, mesa_format format)
+{
+   if (!_mesa_is_format_astc_2d(format))
+      return false;
+
+   if (format == MESA_FORMAT_RGBA_ASTC_5x5 ||
+       format == MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5)
+      return !st->has_astc_5x5_ldr;
+
+   return !st->has_astc_2d_ldr;
+}
 
 bool
 st_compressed_format_fallback(struct st_context *st, mesa_format format)
@@ -236,8 +248,8 @@ st_compressed_format_fallback(struct st_context *st, mesa_format format)
    if (_mesa_is_format_etc2(format))
       return !st->has_etc2;
 
-   if (_mesa_is_format_astc_2d(format))
-      return !st->has_astc_2d_ldr;
+   if (st_astc_format_fallback(st, format))
+      return true;
 
    return false;
 }

src/mesa/state_tracker/st_context.c

@@ -652,6 +652,9 @@ st_create_context_priv(struct gl_context *ctx, struct pipe_context *pipe,
    st->has_astc_2d_ldr =
       screen->is_format_supported(screen, PIPE_FORMAT_ASTC_4x4_SRGB,
                                   PIPE_TEXTURE_2D, 0, 0, PIPE_BIND_SAMPLER_VIEW);
+   st->has_astc_5x5_ldr =
+      screen->is_format_supported(screen, PIPE_FORMAT_ASTC_5x5_SRGB,
+                                  PIPE_TEXTURE_2D, 0, 0, PIPE_BIND_SAMPLER_VIEW);
    st->prefer_blit_based_texture_transfer = screen->get_param(screen,
                               PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER);
    st->force_persample_in_shader =

src/mesa/state_tracker/st_context.h

@@ -137,6 +137,7 @@ struct st_context
    boolean has_etc1;
    boolean has_etc2;
    boolean has_astc_2d_ldr;
+   boolean has_astc_5x5_ldr;
    boolean prefer_blit_based_texture_transfer;
    boolean force_persample_in_shader;
    boolean has_shareable_shaders;

src/mesa/state_tracker/st_format.c

@@ -106,7 +106,7 @@ st_mesa_format_to_pipe_format(const struct st_context *st,
       }
    }
 
-   if (_mesa_is_format_astc_2d(mesaFormat) && !st->has_astc_2d_ldr) {
+   if (st_astc_format_fallback(st, mesaFormat)) {
       if (_mesa_is_format_srgb(mesaFormat))
          return PIPE_FORMAT_R8G8B8A8_SRGB;
       else

src/mesa/state_tracker/st_texture.h

@@ -322,6 +322,9 @@ st_destroy_bound_texture_handles(struct st_context *st);
 void
 st_destroy_bound_image_handles(struct st_context *st);
 
+bool
+st_astc_format_fallback(const struct st_context *st, mesa_format format);
+
 bool
 st_compressed_format_fallback(struct st_context *st, mesa_format format);
 

src/mesa/state_tracker/tests/st_format.c

@@ -59,6 +59,7 @@ int main(int argc, char **argv)
       .has_etc1 = true,
       .has_etc2 = true,
       .has_astc_2d_ldr = true,
+      .has_astc_5x5_ldr = true,
    };
    struct st_context *st = &local_st;