gallium: add PIPE_CAP_TEXTURE_BARRIER

Same issue as with conditional_render.

Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/drivers/nv50/nv50_screen.c

@@ -137,6 +137,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
    case PIPE_CAP_CONDITIONAL_RENDER:
+   case PIPE_CAP_TEXTURE_BARRIER:
       return 1;
    default:
       NOUVEAU_ERR("unknown PIPE_CAP %d\n", param);

src/gallium/drivers/nvc0/nvc0_screen.c

@@ -125,6 +125,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
    case PIPE_CAP_CONDITIONAL_RENDER:
+   case PIPE_CAP_TEXTURE_BARRIER:
       return 1;
    default:
       NOUVEAU_ERR("unknown PIPE_CAP %d\n", param);

src/gallium/drivers/r300/r300_screen.c

@@ -115,6 +115,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
         case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
         case PIPE_CAP_CONDITIONAL_RENDER:
+        case PIPE_CAP_TEXTURE_BARRIER:
             return 1;
 
         /* r300 cannot do swizzling of compressed textures. Supported otherwise. */

src/gallium/drivers/r600/r600_pipe.c

@@ -360,6 +360,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL:
 	case PIPE_CAP_PRIMITIVE_RESTART:
 	case PIPE_CAP_CONDITIONAL_RENDER:
+	case PIPE_CAP_TEXTURE_BARRIER:
 		return 1;
 
 	/* Supported except the original R600. */

src/gallium/include/pipe/p_defines.h

@@ -471,7 +471,8 @@ enum pipe_cap {
    PIPE_CAP_SCALED_RESOLVE = 49,
    PIPE_CAP_MIN_TEXEL_OFFSET = 50,
    PIPE_CAP_MAX_TEXEL_OFFSET = 51,
-   PIPE_CAP_CONDITIONAL_RENDER = 52
+   PIPE_CAP_CONDITIONAL_RENDER = 52,
+   PIPE_CAP_TEXTURE_BARRIER = 53
 };
 
 /* Shader caps not specific to any single stage */

src/mesa/state_tracker/st_extensions.c

@@ -611,7 +611,7 @@ void st_init_extensions(struct st_context *st)
       ctx->Extensions.ARB_sync = GL_TRUE;
    }
 
-   if (st->pipe->texture_barrier) {
+   if (screen->get_param(screen, PIPE_CAP_TEXTURE_BARRIER)) {
       ctx->Extensions.NV_texture_barrier = GL_TRUE;
    }