From 22604727e469f4a9881f722be319670d5cde4519 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Mon, 11 Aug 2008 14:59:26 -0600
Subject: [PATCH] gallium: emit sprite coords (gl_PointCoord)

---
 .../auxiliary/draw/draw_pipe_wide_point.c     | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/gallium/auxiliary/draw/draw_pipe_wide_point.c b/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
index d40a07f4aed..54590984c6b 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_wide_point.c
@@ -50,6 +50,8 @@ struct widepoint_stage {
    uint num_texcoords;
 
    int psize_slot;
+
+   int point_coord_fs_input;  /**< input for pointcoord (and fog) */
 };
 
 
@@ -84,6 +86,13 @@ static void set_texcoords(const struct widepoint_stage *wide,
          v->data[j][3] = tc[3];
       }
    }
+
+   if (wide->point_coord_fs_input >= 0) {
+      /* put gl_PointCoord into extra vertex output's zw components */
+      uint k = wide->stage.draw->extra_vp_outputs.slot;
+      v->data[k][2] = tc[0];
+      v->data[k][3] = tc[1];
+   }
 }
 
 
@@ -208,6 +217,18 @@ static void widepoint_first_point( struct draw_stage *stage,
          }
       }
       wide->num_texcoords = j;
+
+      /* find fragment shader PointCoord/Fog input */
+      wide->point_coord_fs_input = 0; /* XXX fix this! */
+
+      /* setup extra vp output */
+      draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_FOG;
+      draw->extra_vp_outputs.semantic_index = 0;
+      draw->extra_vp_outputs.slot = draw->vs.num_vs_outputs;
+   }
+   else {
+      wide->point_coord_fs_input = -1;
+      draw->extra_vp_outputs.slot = 0;
    }
 
    wide->psize_slot = -1;
-- 
2.30.2