virgl: Add tweak to apply a swizzle when drawing/blitting to a emulated BGRA texture

With Qemu this final swizzle is not needed, but with vtest it is, i.e. it depends on
how a program using virglrenderer uses the surface that is rendered to, hence
a tweak is added.

v2: Update description and fix spelling (Emil)
v3: Send tweak as binary value instead of using strings (Gurchetan)
Reviewed-by: Gurchetan Singh <[email protected]>

5 files changed, 9 insertions, 0 deletions

diff --git a/src/gallium/drivers/virgl/virgl_context.c b/src/gallium/drivers/virgl/virgl_context.c
index 3ce131a1e06..5f643788664 100644
--- a/src/gallium/drivers/virgl/virgl_context.c
+++ b/src/gallium/drivers/virgl/virgl_context.c
@@ -1406,6 +1406,9 @@ static void virgl_send_tweaks(struct virgl_context *vctx, struct virgl_screen *r
 {
    if (rs->tweak_gles_emulate_bgra)
       virgl_encode_tweak(vctx, virgl_tweak_gles_brga_emulate, 1);
+
+   if (rs->tweak_gles_apply_bgra_dest_swizzle)
+      virgl_encode_tweak(vctx, virgl_tweak_gles_brga_apply_dest_swizzle, 1);
 }
 
 struct pipe_context *virgl_context_create(struct pipe_screen *pscreen,
diff --git a/src/gallium/drivers/virgl/virgl_driinfo.h.in b/src/gallium/drivers/virgl/virgl_driinfo.h.in
index 66d547d4712..d6162b3f39a 100644
--- a/src/gallium/drivers/virgl/virgl_driinfo.h.in
+++ b/src/gallium/drivers/virgl/virgl_driinfo.h.in
@@ -8,5 +8,6 @@
 //   5. Implement the tweak in virglrenderer
 DRI_CONF_SECTION_MISCELLANEOUS
     DRI_CONF_GLES_EMULATE_BGRA("false")
+    DRI_CONF_GLES_APPLY_BGRA_DEST_SWIZZLE("false")
 DRI_CONF_SECTION_END
 
diff --git a/src/gallium/drivers/virgl/virgl_protocol.h b/src/gallium/drivers/virgl/virgl_protocol.h
index 71d1703cada..73795a8a7cd 100644
--- a/src/gallium/drivers/virgl/virgl_protocol.h
+++ b/src/gallium/drivers/virgl/virgl_protocol.h
@@ -593,6 +593,7 @@ enum virgl_context_cmd {
 
 enum vrend_tweak_type {
    virgl_tweak_gles_brga_emulate,
+   virgl_tweak_gles_brga_apply_dest_swizzle,
    virgl_tweak_undefined
 };
 
diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
index 54bde6f1237..e96a10ffbc7 100644
--- a/src/gallium/drivers/virgl/virgl_screen.c
+++ b/src/gallium/drivers/virgl/virgl_screen.c
@@ -855,6 +855,7 @@ virgl_create_screen(struct virgl_winsys *vws, const struct pipe_screen_config *c
    struct virgl_screen *screen = CALLOC_STRUCT(virgl_screen);
 
    const char *VIRGL_GLES_EMULATE_BGRA = "gles_emulate_bgra";
+   const char *VIRGL_GLES_APPLY_BGRA_DEST_SWIZZLE = "gles_apply_bgra_dest_swizzle";
    if (!screen)
       return NULL;
 
@@ -863,6 +864,8 @@ virgl_create_screen(struct virgl_winsys *vws, const struct pipe_screen_config *c
    if (config && config->options) {
       screen->tweak_gles_emulate_bgra =
             driQueryOptionb(config->options, VIRGL_GLES_EMULATE_BGRA);
+      screen->tweak_gles_apply_bgra_dest_swizzle =
+            driQueryOptionb(config->options, VIRGL_GLES_APPLY_BGRA_DEST_SWIZZLE);
    }
    screen->vws = vws;
    screen->base.get_name = virgl_get_name;
diff --git a/src/gallium/drivers/virgl/virgl_screen.h b/src/gallium/drivers/virgl/virgl_screen.h
index 62001421936..89b06a25e35 100644
--- a/src/gallium/drivers/virgl/virgl_screen.h
+++ b/src/gallium/drivers/virgl/virgl_screen.h
@@ -47,6 +47,7 @@ struct virgl_screen {
 
    uint32_t sub_ctx_id;
    bool tweak_gles_emulate_bgra;
+   bool tweak_gles_apply_bgra_dest_swizzle;
 };