gallium: add PIPE_CAP_CONDITIONAL_RENDER

We were checking whether render_condition is set. That was not reliable,
because it's always set with trace and noop regardless of driver support.

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

src/gallium/drivers/nv50/nv50_screen.c

@@ -136,6 +136,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_INSTANCEID:
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
+   case PIPE_CAP_CONDITIONAL_RENDER:
       return 1;
    default:
       NOUVEAU_ERR("unknown PIPE_CAP %d\n", param);

src/gallium/drivers/nvc0/nvc0_screen.c

@@ -124,6 +124,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_INSTANCEID:
    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
+   case PIPE_CAP_CONDITIONAL_RENDER:
       return 1;
    default:
       NOUVEAU_ERR("unknown PIPE_CAP %d\n", param);

src/gallium/drivers/r300/r300_screen.c

@@ -114,6 +114,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
         case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
         case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+        case PIPE_CAP_CONDITIONAL_RENDER:
             return 1;
 
         /* r300 cannot do swizzling of compressed textures. Supported otherwise. */

src/gallium/drivers/r600/r600_pipe.c

@@ -359,6 +359,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_SEAMLESS_CUBE_MAP:
 	case PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL:
 	case PIPE_CAP_PRIMITIVE_RESTART:
+	case PIPE_CAP_CONDITIONAL_RENDER:
 		return 1;
 
 	/* Supported except the original R600. */

src/gallium/drivers/softpipe/sp_screen.c

@@ -124,6 +124,8 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
       return -8;
    case PIPE_CAP_MAX_TEXEL_OFFSET:
       return 7;
+   case PIPE_CAP_CONDITIONAL_RENDER:
+      return 1;
    default:
       return 0;
    }

src/gallium/include/pipe/p_defines.h

@@ -470,7 +470,8 @@ enum pipe_cap {
    PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE = 48,
    PIPE_CAP_SCALED_RESOLVE = 49,
    PIPE_CAP_MIN_TEXEL_OFFSET = 50,
-   PIPE_CAP_MAX_TEXEL_OFFSET = 51
+   PIPE_CAP_MAX_TEXEL_OFFSET = 51,
+   PIPE_CAP_CONDITIONAL_RENDER = 52
 };
 
 /* Shader caps not specific to any single stage */

src/gallium/state_trackers/d3d1x/gd3d11/d3d11_context.h

@@ -150,7 +150,7 @@ struct GalliumD3D10Device : public GalliumD3D10ScreenImpl<threadsafe>
 	{
 		if(!pipe->begin_query)
 			caps.queries = false;
-		if(!pipe->render_condition)
+		if(!pipe->render_condition || !screen->get_param(screen, PIPE_CAP_CONDITIONAL_RENDER))
 			caps.render_condition = false;
 		if(!pipe->bind_gs_state)
 		{

src/mesa/state_tracker/st_extensions.c

@@ -501,7 +501,7 @@ void st_init_extensions(struct st_context *st)
       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
    }
 
-   if (st->pipe->render_condition) {
+   if (screen->get_param(screen, PIPE_CAP_CONDITIONAL_RENDER)) {
       ctx->Extensions.NV_conditional_render = GL_TRUE;
    }