Re: [Nouveau] [PATCH v2] nv50, nvc0: clear out RT on a null cbuf

[Emil Velikov <emil.l.velikov@gmail.com>]

On 17/01/14 02:23, Ilia Mirkin wrote:
> This is needed since commit 9baa45f78b (st/mesa: bind NULL colorbuffers
> as specified by glDrawBuffers).
> 
> This implementation is highly based on a larger commit by
> Christoph Bumiller <e0425955@student.tuwien.ac.at> in his gallium-nine
> branch.
> 
Ilia,
Do you know why we cannot set the rt height to 64? After all you
explicitly set the format to NONE.

Either way this patch looks good afaics
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
> Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
> ---
>  src/gallium/drivers/nouveau/nv50/nv50_defs.xml.h   |  1 +
>  src/gallium/drivers/nouveau/nv50/nv50_formats.c    |  1 -
>  .../drivers/nouveau/nv50/nv50_state_validate.c     | 30 +++++++++++++++++++---
>  .../drivers/nouveau/nvc0/nvc0_state_validate.c     | 28 +++++++++++++++++---
>  4 files changed, 52 insertions(+), 8 deletions(-)
> 
> diff --git a/src/gallium/drivers/nouveau/nv50/nv50_defs.xml.h b/src/gallium/drivers/nouveau/nv50/nv50_defs.xml.h
> index 2e42843..80de3be 100644
> --- a/src/gallium/drivers/nouveau/nv50/nv50_defs.xml.h
> +++ b/src/gallium/drivers/nouveau/nv50/nv50_defs.xml.h
> @@ -78,6 +78,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
>  #define NV50_VSTATUS_BLOCKED					0x00000005
>  #define NV50_VSTATUS_FAULTED					0x00000006
>  #define NV50_VSTATUS_PAUSED					0x00000007
> +#define NV50_SURFACE_FORMAT_NONE				0x00000000
>  #define NV50_SURFACE_FORMAT_BITMAP				0x0000001c
>  #define NV50_SURFACE_FORMAT_UNK1D				0x0000001d
>  #define NV50_SURFACE_FORMAT_RGBA32_FLOAT			0x000000c0
> diff --git a/src/gallium/drivers/nouveau/nv50/nv50_formats.c b/src/gallium/drivers/nouveau/nv50/nv50_formats.c
> index 0a7e812..d21905d 100644
> --- a/src/gallium/drivers/nouveau/nv50/nv50_formats.c
> +++ b/src/gallium/drivers/nouveau/nv50/nv50_formats.c
> @@ -71,7 +71,6 @@
>  # define U_tV  U_V
>  #endif
>  
> -#define NV50_SURFACE_FORMAT_NONE 0
>  #define NV50_ZETA_FORMAT_NONE 0
>  
>  /* for vertex buffers: */
> diff --git a/src/gallium/drivers/nouveau/nv50/nv50_state_validate.c b/src/gallium/drivers/nouveau/nv50/nv50_state_validate.c
> index 86b9a23..bb05f03 100644
> --- a/src/gallium/drivers/nouveau/nv50/nv50_state_validate.c
> +++ b/src/gallium/drivers/nouveau/nv50/nv50_state_validate.c
> @@ -1,6 +1,19 @@
>  
>  #include "nv50/nv50_context.h"
> -#include "os/os_time.h"
> +#include "nv50/nv50_defs.xml.h"
> +
> +static INLINE void
> +nv50_fb_set_null_rt(struct nouveau_pushbuf *push, unsigned i)
> +{
> +   BEGIN_NV04(push, NV50_3D(RT_ADDRESS_HIGH(i)), 4);
> +   PUSH_DATA (push, 0);
> +   PUSH_DATA (push, 0);
> +   PUSH_DATA (push, NV50_SURFACE_FORMAT_NONE);
> +   PUSH_DATA (push, 0);
> +   BEGIN_NV04(push, NV50_3D(RT_HORIZ(i)), 2);
> +   PUSH_DATA (push, 64);
> +   PUSH_DATA (push, 0);
> +}
>  
>  static void
>  nv50_validate_fb(struct nv50_context *nv50)
> @@ -20,9 +33,18 @@ nv50_validate_fb(struct nv50_context *nv50)
>     PUSH_DATA (push, fb->height << 16);
>  
>     for (i = 0; i < fb->nr_cbufs; ++i) {
> -      struct nv50_miptree *mt = nv50_miptree(fb->cbufs[i]->texture);
> -      struct nv50_surface *sf = nv50_surface(fb->cbufs[i]);
> -      struct nouveau_bo *bo = mt->base.bo;
> +      struct nv50_miptree *mt;
> +      struct nv50_surface *sf;
> +      struct nouveau_bo *bo;
> +
> +      if (!fb->cbufs[i]) {
> +         nv50_fb_set_null_rt(push, i);
> +         continue;
> +      }
> +
> +      mt = nv50_miptree(fb->cbufs[i]->texture);
> +      sf = nv50_surface(fb->cbufs[i]);
> +      bo = mt->base.bo;
>  
>        array_size = MIN2(array_size, sf->depth);
>        if (mt->layout_3d)
> diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c b/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
> index 0ba4bad..dd71c65 100644
> --- a/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
> +++ b/src/gallium/drivers/nouveau/nvc0/nvc0_state_validate.c
> @@ -2,6 +2,7 @@
>  #include "util/u_math.h"
>  
>  #include "nvc0/nvc0_context.h"
> +#include "nv50/nv50_defs.xml.h"
>  
>  #if 0
>  static void
> @@ -54,6 +55,18 @@ nvc0_validate_zcull(struct nvc0_context *nvc0)
>  }
>  #endif
>  
> +static INLINE void
> +nvc0_fb_set_null_rt(struct nouveau_pushbuf *push, unsigned i)
> +{
> +   BEGIN_NVC0(push, NVC0_3D(RT_ADDRESS_HIGH(i)), 6);
> +   PUSH_DATA (push, 0);
> +   PUSH_DATA (push, 0);
> +   PUSH_DATA (push, 64);
> +   PUSH_DATA (push, 0);
> +   PUSH_DATA (push, NV50_SURFACE_FORMAT_NONE);
> +   PUSH_DATA (push, 0);
> +}
> +
>  static void
>  nvc0_validate_fb(struct nvc0_context *nvc0)
>  {
> @@ -72,9 +85,18 @@ nvc0_validate_fb(struct nvc0_context *nvc0)
>      PUSH_DATA (push, fb->height << 16);
>  
>      for (i = 0; i < fb->nr_cbufs; ++i) {
> -        struct nv50_surface *sf = nv50_surface(fb->cbufs[i]);
> -        struct nv04_resource *res = nv04_resource(sf->base.texture);
> -        struct nouveau_bo *bo = res->bo;
> +        struct nv50_surface *sf;
> +        struct nv04_resource *res;
> +        struct nouveau_bo *bo;
> +
> +        if (!fb->cbufs[i]) {
> +           nvc0_fb_set_null_rt(push, i);
> +           continue;
> +        }
> +
> +        sf = nv50_surface(fb->cbufs[i]);
> +        res = nv04_resource(sf->base.texture);
> +        bo = res->bo;
>  
>          BEGIN_NVC0(push, NVC0_3D(RT_ADDRESS_HIGH(i)), 9);
>          PUSH_DATAh(push, res->address + sf->offset);
>