gallium: add PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX

The next patch will use it. This is really for svga and GL2-level drivers.

Tested-by: Edmondo Tommasina <edmondo.tommasina@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/docs/source/screen.rst

@@ -389,6 +389,8 @@ The integer capabilities:
 * ``PIPE_CAP_TGSI_TES_LAYER_VIEWPORT``: Whether ``TGSI_SEMANTIC_LAYER`` and
   ``TGSI_SEMANTIC_VIEWPORT_INDEX`` are supported as tessellation evaluation
   shader outputs.
+* ``PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX``: Whether a buffer with just
+  PIPE_BIND_CONSTANT_BUFFER can be legally passed to set_vertex_buffers.
 
 
 .. _pipe_capf:

src/gallium/drivers/etnaviv/etnaviv_screen.c

@@ -254,6 +254,7 @@ etna_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
    case PIPE_CAP_TGSI_BALLOT:
    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 0;
 
    /* Stream output. */

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -313,6 +313,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
 	case PIPE_CAP_TGSI_BALLOT:
 	case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+	case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
 		return 0;
 
 	case PIPE_CAP_MAX_VIEWPORTS:

src/gallium/drivers/i915/i915_screen.c

@@ -306,6 +306,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
    case PIPE_CAP_TGSI_BALLOT:
    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 0;
 
    case PIPE_CAP_MAX_VIEWPORTS:

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -352,6 +352,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
    case PIPE_CAP_TGSI_BALLOT:
    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 0;
    }
    /* should only get here on unhandled cases */

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

@@ -216,6 +216,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
    case PIPE_CAP_TGSI_BALLOT:
    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

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

@@ -200,6 +200,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
    case PIPE_CAP_TGSI_TEX_TXF_LZ:
    case PIPE_CAP_TGSI_CLOCK:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 1;
    case PIPE_CAP_SEAMLESS_CUBE_MAP:
       return 1; /* class_3d >= NVA0_3D_CLASS; */

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

@@ -249,6 +249,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_TEX_TXF_LZ:
    case PIPE_CAP_TGSI_CLOCK:
    case PIPE_CAP_COMPUTE:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 1;
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
       return (class_3d >= NVE4_3D_CLASS) ? 1 : 0;

src/gallium/drivers/r300/r300_screen.c

@@ -238,6 +238,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
         case PIPE_CAP_TGSI_BALLOT:
         case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+        case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
             return 0;
 
         /* SWTCL-only features. */

src/gallium/drivers/r600/r600_pipe.c

@@ -286,6 +286,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
 	case PIPE_CAP_CLEAR_TEXTURE:
 	case PIPE_CAP_TGSI_MUL_ZERO_WINS:
+	case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
 		return 1;
 
 	case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:

src/gallium/drivers/radeonsi/si_pipe.c

@@ -424,6 +424,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_INT64:
 	case PIPE_CAP_INT64_DIVMOD:
 	case PIPE_CAP_TGSI_CLOCK:
+	case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
 		return 1;
 
 	case PIPE_CAP_TGSI_VOTE:

src/gallium/drivers/softpipe/sp_screen.c

@@ -302,6 +302,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
    case PIPE_CAP_TGSI_BALLOT:
    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 0;
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
       return 4;

src/gallium/drivers/svga/svga_screen.c

@@ -433,6 +433,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
    case PIPE_CAP_TGSI_BALLOT:
    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 0;
    }
 

src/gallium/drivers/swr/swr_screen.cpp

@@ -337,6 +337,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
    case PIPE_CAP_TGSI_BALLOT:
    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/vc4/vc4_screen.c

@@ -253,6 +253,7 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
         case PIPE_CAP_TGSI_BALLOT:
         case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+	case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
                 return 0;
 
                 /* Stream output. */

src/gallium/drivers/virgl/virgl_screen.c

@@ -262,6 +262,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_BALLOT:
    case PIPE_CAP_DOUBLES:
    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
       return 0;
    case PIPE_CAP_VENDOR_ID:
       return 0x1af4;

src/gallium/include/pipe/p_defines.h

@@ -762,6 +762,7 @@ enum pipe_cap
    PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE,
    PIPE_CAP_TGSI_BALLOT,
    PIPE_CAP_TGSI_TES_LAYER_VIEWPORT,
+   PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX,
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)