gallium: add fragment shader property for color writes to all buffers. (v2)

For GL fragColor semantics we need to tell the pipe drivers that the fragment
shader color result is to be replicated to all bound color buffers, this
adds the basic TGSI + documentation.

v2: fix missing comma pointed out by Tilman on mesa-dev.

Signed-off-by: Dave Airlie <[email protected]>

3 files changed, 23 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_text.c b/src/gallium/auxiliary/tgsi/tgsi_text.c
index 9a38c37979c..ccb17b77504 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_text.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_text.c
@@ -1264,7 +1264,8 @@ static const char *property_names[] =
    "GS_OUTPUT_PRIMITIVE",
    "GS_MAX_OUTPUT_VERTICES",
    "FS_COORD_ORIGIN",
-   "FS_COORD_PIXEL_CENTER"
+   "FS_COORD_PIXEL_CENTER",
+   "FS_COLOR0_WRITE_ALL_CBUFS"
 };
 
 static const char *primitive_names[] =
@@ -1398,6 +1399,8 @@ static boolean parse_property( struct translate_ctx *ctx )
          return FALSE;
       }
       break;
+   case TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS:
+      break;
    default:
       if (!parse_uint(&ctx->cur, &values[0] )) {
          report_error( ctx, "Expected unsigned integer as property!" );
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.c b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
index 7d13a17bdbc..02de12d77d5 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
@@ -148,6 +148,7 @@ struct ureg_program
    unsigned property_gs_max_vertices;
    unsigned char property_fs_coord_origin; /* = TGSI_FS_COORD_ORIGIN_* */
    unsigned char property_fs_coord_pixel_center; /* = TGSI_FS_COORD_PIXEL_CENTER_* */
+   unsigned char property_fs_color0_writes_all_cbufs; /* = TGSI_FS_COLOR0_WRITES_ALL_CBUFS * */
 
    unsigned nr_addrs;
    unsigned nr_preds;
@@ -284,7 +285,12 @@ ureg_property_fs_coord_pixel_center(struct ureg_program *ureg,
    ureg->property_fs_coord_pixel_center = fs_coord_pixel_center;
 }
 
-
+void
+ureg_property_fs_color0_writes_all_cbufs(struct ureg_program *ureg,
+                            unsigned fs_color0_writes_all_cbufs)
+{
+   ureg->property_fs_color0_writes_all_cbufs = fs_color0_writes_all_cbufs;
+}
 
 struct ureg_src
 ureg_DECL_fs_input_cyl_centroid(struct ureg_program *ureg,
@@ -1278,6 +1284,14 @@ static void emit_decls( struct ureg_program *ureg )
                     ureg->property_fs_coord_pixel_center);
    }
 
+   if (ureg->property_fs_color0_writes_all_cbufs) {
+      assert(ureg->processor == TGSI_PROCESSOR_FRAGMENT);
+
+      emit_property(ureg,
+                    TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS,
+                    ureg->property_fs_color0_writes_all_cbufs);
+   }
+
    if (ureg->processor == TGSI_PROCESSOR_VERTEX) {
       for (i = 0; i < UREG_MAX_INPUT; i++) {
          if (ureg->vs_inputs[i/32] & (1 << (i%32))) {
diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.h b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
index acc463200a6..807128a5e52 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.h
@@ -153,6 +153,10 @@ void
 ureg_property_fs_coord_pixel_center(struct ureg_program *ureg,
                             unsigned fs_coord_pixel_center);
 
+void
+ureg_property_fs_color0_writes_all_cbufs(struct ureg_program *ureg,
+                            unsigned fs_color0_writes_all_cbufs);
+
 /***********************************************************************
  * Build shader declarations:
  */