gallium: allow drivers to impose BO flags restrictions on constant buffer 0

Required by radeonsi for optimal behavior.

src/gallium/docs/source/screen.rst

@@ -414,6 +414,10 @@ The integer capabilities:
   contexts can return 0.
 * ``PIPE_CAP_FENCE_SIGNAL``: True if the driver supports signaling semaphores
   using fence_server_signal().
+* ``PIPE_CAP_CONSTBUF0_FLAGS``: The bits of pipe_resource::flags that must be
+  set when binding that buffer as constant buffer 0. If the buffer doesn't have
+  those bits set, pipe_context::set_constant_buffer(.., 0, ..) is ignored
+  by the driver, and the driver can throw assertion failures.
 
 
 .. _pipe_capf:

src/gallium/drivers/etnaviv/etnaviv_screen.c

@@ -267,6 +267,7 @@ etna_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
 
    /* Stream output. */

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -337,6 +337,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
 	case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
 	case PIPE_CAP_FENCE_SIGNAL:
+	case PIPE_CAP_CONSTBUF0_FLAGS:
 		return 0;
 
 	case PIPE_CAP_CONTEXT_PRIORITY_MASK:

src/gallium/drivers/i915/i915_screen.c

@@ -325,6 +325,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
 
    case PIPE_CAP_MAX_VIEWPORTS:

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -360,6 +360,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
    }
    /* should only get here on unhandled cases */

src/gallium/drivers/nouveau/nv30/nv30_screen.c

@@ -227,6 +227,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nv50/nv50_screen.c

@@ -279,6 +279,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -308,6 +308,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/r300/r300_screen.c

@@ -249,6 +249,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
         case PIPE_CAP_CONTEXT_PRIORITY_MASK:
         case PIPE_CAP_FENCE_SIGNAL:
+        case PIPE_CAP_CONSTBUF0_FLAGS:
             return 0;
 
         /* SWTCL-only features. */

src/gallium/drivers/r600/r600_pipe.c

@@ -413,6 +413,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
 	case PIPE_CAP_CONTEXT_PRIORITY_MASK:
 	case PIPE_CAP_FENCE_SIGNAL:
+	case PIPE_CAP_CONSTBUF0_FLAGS:
 		return 0;
 
 	case PIPE_CAP_DOUBLES:

src/gallium/drivers/radeonsi/si_get.c

@@ -268,6 +268,7 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_TILE_RASTER_ORDER:
 	case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
 	case PIPE_CAP_CONTEXT_PRIORITY_MASK:
+	case PIPE_CAP_CONSTBUF0_FLAGS:
 		return 0;
 
 	case PIPE_CAP_FENCE_SIGNAL:

src/gallium/drivers/softpipe/sp_screen.c

@@ -312,6 +312,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
       return 4;

src/gallium/drivers/svga/svga_screen.c

@@ -450,6 +450,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
    }
 

src/gallium/drivers/swr/swr_screen.cpp

@@ -345,6 +345,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/vc4/vc4_screen.c

@@ -287,6 +287,7 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
         case PIPE_CAP_CONTEXT_PRIORITY_MASK:
         case PIPE_CAP_FENCE_SIGNAL:
+	case PIPE_CAP_CONSTBUF0_FLAGS:
                 return 0;
 
                 /* Stream output. */

src/gallium/drivers/vc5/vc5_screen.c

@@ -259,6 +259,7 @@ vc5_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
         case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
         case PIPE_CAP_CONTEXT_PRIORITY_MASK:
+	case PIPE_CAP_CONSTBUF0_FLAGS:
                 return 0;
 
                 /* Geometry shader output, unsupported. */

src/gallium/drivers/virgl/virgl_screen.c

@@ -273,6 +273,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
    case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
       return 0;
    case PIPE_CAP_VENDOR_ID:
       return 0x1af4;

src/gallium/include/pipe/p_defines.h

@@ -793,6 +793,7 @@ enum pipe_cap
    PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET,
    PIPE_CAP_CONTEXT_PRIORITY_MASK,
    PIPE_CAP_FENCE_SIGNAL,
+   PIPE_CAP_CONSTBUF0_FLAGS,
 };
 
 /**