From cba6430524198a1bdcdeada03cbe946a454f3935 Mon Sep 17 00:00:00 2001
From: Marek Olšák <maraeo@gmail.com>
Date: Thu, 24 Dec 2009 21:29:41 +0100
Subject: r300g: add generating texture coordinates for point sprites (WIP)

---
 src/gallium/drivers/r300/r300_state.c | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'src/gallium/drivers/r300/r300_state.c')

diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index d7d654dc31..db7844eef0 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -715,6 +715,7 @@ static void* r300_create_rs_state(struct pipe_context* pipe,
 {
     struct r300_screen* r300screen = r300_screen(pipe->screen);
     struct r300_rs_state* rs = CALLOC_STRUCT(r300_rs_state);
+    unsigned coord_index;
 
     /* Copy rasterizer state for Draw. */
     rs->rs = *state;
@@ -807,6 +808,32 @@ static void* r300_create_rs_state(struct pipe_context* pipe,
         rs->color_control = R300_SHADE_MODEL_SMOOTH;
     }
 
+    /* Point sprites */
+    if (state->sprite_coord_enable) {
+        coord_index = ffs(state->sprite_coord_enable)-1;
+
+        SCREEN_DBG(r300screen, DBG_DRAW,
+                   "r300: point sprite: shader coord=%d\n", coord_index);
+
+        rs->stuffing_enable =
+            R300_GB_POINT_STUFF_ENABLE |
+            R300_GB_TEX_ST << (R300_GB_TEX0_SOURCE_SHIFT + (coord_index*2));
+
+        rs->point_texcoord_left = 0.0f;
+        rs->point_texcoord_right = 1.0f;
+
+        switch (state->sprite_coord_mode) {
+            case PIPE_SPRITE_COORD_UPPER_LEFT:
+                rs->point_texcoord_top = 0.0f;
+                rs->point_texcoord_bottom = 1.0f;
+                break;
+            case PIPE_SPRITE_COORD_LOWER_LEFT:
+                rs->point_texcoord_top = 1.0f;
+                rs->point_texcoord_bottom = 0.0f;
+                break;
+        }
+    }
+
     return (void*)rs;
 }
 
@@ -816,6 +843,7 @@ static void r300_bind_rs_state(struct pipe_context* pipe, void* state)
     struct r300_context* r300 = r300_context(pipe);
     struct r300_rs_state* rs = (struct r300_rs_state*)state;
     boolean scissor_was_enabled = r300->scissor_enabled;
+    int last_sprite_coord_index = r300->sprite_coord_index;
 
     if (r300->draw) {
         draw_flush(r300->draw);
@@ -825,17 +853,22 @@ static void r300_bind_rs_state(struct pipe_context* pipe, void* state)
     if (rs) {
         r300->polygon_offset_enabled = rs->rs.offset_cw || rs->rs.offset_ccw;
         r300->scissor_enabled = rs->rs.scissor;
+        r300->sprite_coord_index = ffs(rs->rs.sprite_coord_enable)-1;
     } else {
         r300->polygon_offset_enabled = FALSE;
         r300->scissor_enabled = FALSE;
+        r300->sprite_coord_index = -1;
     }
 
     UPDATE_STATE(state, r300->rs_state);
-    r300->rs_state.size = 17 + (r300->polygon_offset_enabled ? 5 : 0);
+    r300->rs_state.size = 24 + (r300->polygon_offset_enabled ? 5 : 0);
 
     if (scissor_was_enabled != r300->scissor_enabled) {
         r300->scissor_state.dirty = TRUE;
     }
+    if (last_sprite_coord_index != r300->sprite_coord_index) {
+        r300->rs_block_state.dirty = TRUE;
+    }
 }
 
 /* Free rasterizer state. */
-- 
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