From 1b4852345954af9b582b03a91a3d8399b8fb0e92 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Mon, 22 Oct 2007 12:10:30 -0600
Subject: add support for sprite texcoord modes

---
 src/mesa/pipe/draw/draw_wide_prims.c        | 27 ++++++++++++++++++++-------
 src/mesa/pipe/p_defines.h                   |  7 +++++++
 src/mesa/pipe/p_state.h                     |  1 +
 src/mesa/state_tracker/st_atom_rasterizer.c | 12 ++++++++++++
 4 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/src/mesa/pipe/draw/draw_wide_prims.c b/src/mesa/pipe/draw/draw_wide_prims.c
index 0d02e70814..917944a611 100644
--- a/src/mesa/pipe/draw/draw_wide_prims.c
+++ b/src/mesa/pipe/draw/draw_wide_prims.c
@@ -40,7 +40,8 @@ struct wide_stage {
    float half_line_width;
    float half_point_size;
 
-   uint texcoord[PIPE_MAX_SHADER_OUTPUTS];
+   uint texcoord_slot[PIPE_MAX_SHADER_OUTPUTS];
+   uint texcoord_mode[PIPE_MAX_SHADER_OUTPUTS];
    uint num_texcoords;
 };
 
@@ -123,16 +124,26 @@ static void wide_line( struct draw_stage *stage,
 }
 
 
+/**
+ * Set the vertex texcoords for sprite mode.
+ * Coords may be left untouched or set to a right-side-up or upside-down
+ * orientation.
+ */
 static void set_texcoords(const struct wide_stage *wide,
                           struct vertex_header *v, const float tc[4])
 {
    uint i;
    for (i = 0; i < wide->num_texcoords; i++) {
-      uint j = wide->texcoord[i];
-      v->data[j][0] = tc[0];
-      v->data[j][1] = tc[1];
-      v->data[j][2] = tc[2];
-      v->data[j][3] = tc[3];
+      if (wide->texcoord_mode[i] != PIPE_SPRITE_COORD_NONE) {
+         uint j = wide->texcoord_slot[i];
+         v->data[j][0] = tc[0];
+         if (wide->texcoord_mode[i] == PIPE_SPRITE_COORD_LOWER_LEFT)
+            v->data[j][1] = 1.0 - tc[1];
+         else
+            v->data[j][1] = tc[1];
+         v->data[j][2] = tc[2];
+         v->data[j][3] = tc[3];
+      }
    }
 }
 
@@ -230,7 +241,9 @@ static void wide_begin( struct draw_stage *stage )
       uint i, j = 0;
       for (i = 0; i < vs->state->num_outputs; i++) {
          if (vs->state->output_semantic_name[i] == TGSI_SEMANTIC_GENERIC) {
-            wide->texcoord[j++] = i;
+            wide->texcoord_slot[j] = i;
+            wide->texcoord_mode[j] = draw->rasterizer->sprite_coord_mode[j];
+            j++;
          }
       }
       wide->num_texcoords = j;
diff --git a/src/mesa/pipe/p_defines.h b/src/mesa/pipe/p_defines.h
index d336f83998..9281d40bd3 100644
--- a/src/mesa/pipe/p_defines.h
+++ b/src/mesa/pipe/p_defines.h
@@ -308,4 +308,11 @@
 #define PIPE_QUERY_TYPES                 3
 
 
+/**
+ * Point sprite coord modes
+ */
+#define PIPE_SPRITE_COORD_NONE       0
+#define PIPE_SPRITE_COORD_UPPER_LEFT 1
+#define PIPE_SPRITE_COORD_LOWER_LEFT 2
+
 #endif
diff --git a/src/mesa/pipe/p_state.h b/src/mesa/pipe/p_state.h
index fd3f4f22b9..ecbcbd098a 100644
--- a/src/mesa/pipe/p_state.h
+++ b/src/mesa/pipe/p_state.h
@@ -96,6 +96,7 @@ struct pipe_rasterizer_state
    float point_size;           /**< used when no per-vertex size */
    float offset_units;
    float offset_scale;
+   ubyte sprite_coord_mode[PIPE_MAX_SHADER_OUTPUTS]; /**< PIPE_SPRITE_COORD_ */
 };
 
 
diff --git a/src/mesa/state_tracker/st_atom_rasterizer.c b/src/mesa/state_tracker/st_atom_rasterizer.c
index 9fbd7dc09e..9f857e2837 100644
--- a/src/mesa/state_tracker/st_atom_rasterizer.c
+++ b/src/mesa/state_tracker/st_atom_rasterizer.c
@@ -74,6 +74,7 @@ static void update_raster_state( struct st_context *st )
    GLcontext *ctx = st->ctx;
    struct pipe_rasterizer_state raster;
    const struct cso_rasterizer *cso;
+   uint i;
 
    memset(&raster, 0, sizeof(raster));
    
@@ -189,6 +190,17 @@ static void update_raster_state( struct st_context *st )
    raster.point_size = ctx->Point.Size;
    raster.point_smooth = ctx->Point.SmoothFlag;
    raster.point_sprite = ctx->Point.PointSprite;
+   for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
+      if (ctx->Point.CoordReplace[i]) {
+         if (ctx->Point.SpriteOrigin == GL_UPPER_LEFT)
+            raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_UPPER_LEFT;
+         else 
+            raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_LOWER_LEFT;
+      }
+      else {
+         raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_NONE;
+      }
+   }
 
    /* _NEW_LINE
     */
-- 
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