gallium: add tessellation shader properties

v2: Marek: rename tess spacing definitions

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/auxiliary/tgsi/tgsi_strings.c

@@ -131,7 +131,12 @@ const char *tgsi_property_names[TGSI_PROPERTY_COUNT] =
    "FS_DEPTH_LAYOUT",
    "VS_PROHIBIT_UCPS",
    "GS_INVOCATIONS",
-   "VS_WINDOW_SPACE_POSITION"
+   "VS_WINDOW_SPACE_POSITION",
+   "TCS_VERTICES_OUT",
+   "TES_PRIM_MODE",
+   "TES_SPACING",
+   "TES_VERTEX_ORDER_CW",
+   "TES_POINT_MODE",
 };
 
 const char *tgsi_return_type_names[TGSI_RETURN_TYPE_COUNT] =

src/gallium/docs/source/tgsi.rst

@@ -3071,6 +3071,39 @@ Naturally, clipping is not performed on window coordinates either.
 The effect of this property is undefined if a geometry or tessellation shader
 are in use.
 
+TCS_VERTICES_OUT
+""""""""""""""""
+
+The number of vertices written by the tessellation control shader. This
+effectively defines the patch input size of the tessellation evaluation shader
+as well.
+
+TES_PRIM_MODE
+"""""""""""""
+
+This sets the tessellation primitive mode, one of ``PIPE_PRIM_TRIANGLES``,
+``PIPE_PRIM_QUADS``, or ``PIPE_PRIM_LINES``. (Unlike in GL, there is no
+separate isolines settings, the regular lines is assumed to mean isolines.)
+
+TES_SPACING
+"""""""""""
+
+This sets the spacing mode of the tessellation generator, one of
+``PIPE_TESS_SPACING_*``.
+
+TES_VERTEX_ORDER_CW
+"""""""""""""""""""
+
+This sets the vertex order to be clockwise if the value is 1, or
+counter-clockwise if set to 0.
+
+TES_POINT_MODE
+""""""""""""""
+
+If set to a non-zero value, this turns on point mode for the tessellator,
+which means that points will be generated instead of primitives.
+
+
 Texture Sampling and Texture Formats
 ------------------------------------
 

src/gallium/include/pipe/p_defines.h

@@ -431,6 +431,13 @@ enum pipe_flush_flags
 #define PIPE_PRIM_MAX                      15
 
 
+/**
+ * Tessellator spacing types
+ */
+#define PIPE_TESS_SPACING_FRACTIONAL_ODD    0
+#define PIPE_TESS_SPACING_FRACTIONAL_EVEN   1
+#define PIPE_TESS_SPACING_EQUAL             2
+
 /**
  * Query object types
  */

src/gallium/include/pipe/p_shader_tokens.h

@@ -262,7 +262,12 @@ union tgsi_immediate_data
 #define TGSI_PROPERTY_VS_PROHIBIT_UCPS       7
 #define TGSI_PROPERTY_GS_INVOCATIONS         8
 #define TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION 9
-#define TGSI_PROPERTY_COUNT                  10
+#define TGSI_PROPERTY_TCS_VERTICES_OUT       10
+#define TGSI_PROPERTY_TES_PRIM_MODE          11
+#define TGSI_PROPERTY_TES_SPACING            12
+#define TGSI_PROPERTY_TES_VERTEX_ORDER_CW    13
+#define TGSI_PROPERTY_TES_POINT_MODE         14
+#define TGSI_PROPERTY_COUNT                  15
 
 struct tgsi_property {
    unsigned Type         : 4;  /**< TGSI_TOKEN_TYPE_PROPERTY */