vrend: correct blit/copy_image code path

Gallium copy_image redirects calls to resource_copy_region for equal src
and dst formats or if at least one of the two is compressed. Handle the
condition for selecting blit vs. glCopyImageSubRegion accordingly.

Fixes piglit: bptc-float-modes

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/vrend_formats.c

@@ -581,7 +581,8 @@ static boolean format_compressed_compressed_copy_compatible(enum pipe_format src
    return false;
 }
 
-boolean format_is_copy_compatible(enum pipe_format src, enum pipe_format dst)
+boolean format_is_copy_compatible(enum pipe_format src, enum pipe_format dst,
+                                  boolean allow_compressed)
 {
    int r;
 
@@ -594,6 +595,9 @@ boolean format_is_copy_compatible(enum pipe_format src, enum pipe_format dst)
       return util_is_format_compatible(src_desc, dst_desc);
    }
 
+   if (!allow_compressed)
+      return false;
+
    /* compressed-uncompressed */
    r = format_uncompressed_compressed_copy_compatible(src, dst);
    if (r)

src/vrend_renderer.c

@@ -7033,14 +7033,13 @@ void vrend_renderer_resource_copy_region(struct vrend_context *ctx,
       return;
    }
 
-   if (has_feature(feat_copy_image)) {
-      if (format_is_copy_compatible(src_res->base.format,dst_res->base.format) &&
+   if (has_feature(feat_copy_image) &&
+       format_is_copy_compatible(src_res->base.format,dst_res->base.format, true) &&
        src_res->base.nr_samples == dst_res->base.nr_samples) {
       vrend_copy_sub_image(src_res, dst_res, src_level, src_box,
                            dst_level, dstx, dsty, dstz);
       return;
    }
-   }
 
    if (!vrend_format_can_render(src_res->base.format) ||
        !vrend_format_can_render(dst_res->base.format)) {
@@ -7325,13 +7324,16 @@ void vrend_renderer_blit(struct vrend_context *ctx,
    if (info->render_condition_enable == false)
       vrend_pause_render_condition(ctx, true);
 
-   /* The gallium blit function can be called for a general blit that may
-    * scale, convert the data, and apply some rander states or if is called via
-    * glCopyImageSubData. For the latter case forward the call to the
-    * glCopyImageSubData function, otherwise use a framebuffer blit.
-    */
+   /* The Gallium blit function can be called for a general blit that may
+    * scale, convert the data, and apply some rander states, or it is called via
+    * glCopyImageSubData. If the src or the dst image are equal, or the two
+    * images formats are the same, then Galliums such calles are redirected
+    * to resource_copy_region, in this case and if no render states etx need
+    * to be applied, forward the call to glCopyImageSubData, otherwise do a
+    * normal blit. */
    if (has_feature(feat_copy_image) && !info->render_condition_enable &&
-       format_is_copy_compatible(info->src.format,info->dst.format) &&
+       (src_res->base.format != dst_res->base.format) &&
+       format_is_copy_compatible(info->src.format,info->dst.format, false) &&
        !info->scissor_enable && (info->filter == PIPE_TEX_FILTER_NEAREST) &&
        !info->alpha_blend && (info->mask == PIPE_MASK_RGBA) &&
        (src_res->base.nr_samples == dst_res->base.nr_samples) &&

src/vrend_renderer.h

@@ -390,7 +390,8 @@ void vrend_fb_bind_texture(struct vrend_resource *res,
                            uint32_t level, uint32_t layer);
 bool vrend_is_ds_format(enum virgl_formats format);
 bool vrend_format_is_emulated_alpha(enum virgl_formats format);
-boolean format_is_copy_compatible(enum pipe_format src, enum pipe_format dst);
+boolean format_is_copy_compatible(enum pipe_format src, enum pipe_format dst,
+                                  boolean allow_compressed);
 
 /* blitter interface */
 void vrend_renderer_blit_gl(struct vrend_context *ctx,