gallium/util: add functions for manipulating swizzles

Some of those have been in drivers already.

7 files changed, 75 insertions, 41 deletions

diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c
index 9cbdd0a5b99..3a8aeab5fed 100644
--- a/src/gallium/auxiliary/util/u_format.c
+++ b/src/gallium/auxiliary/util/u_format.c
@@ -390,3 +390,53 @@ util_format_translate(enum pipe_format dst_format,
       FREE(tmp_row);
    }
 }
+
+void util_format_compose_swizzles(const unsigned char swz1[4],
+                                  const unsigned char swz2[4],
+                                  unsigned char dst[4])
+{
+   unsigned i;
+
+   for (i = 0; i < 4; i++) {
+      dst[i] = swz2[i] <= UTIL_FORMAT_SWIZZLE_W ?
+               swz1[swz2[i]] : swz2[i];
+   }
+}
+
+void util_format_swizzle_4f(float *dst, const float *src,
+                            const unsigned char swz[4])
+{
+   unsigned i;
+
+   for (i = 0; i < 4; i++) {
+      if (swz[i] < UTIL_FORMAT_SWIZZLE_W)
+         dst[i] = src[swz[i]];
+      else if (swz[i] == UTIL_FORMAT_SWIZZLE_0)
+         dst[i] = 0;
+      else if (swz[i] == UTIL_FORMAT_SWIZZLE_1)
+         dst[i] = 1;
+   }
+}
+
+void util_format_unswizzle_4f(float *dst, const float *src,
+                              const unsigned char swz[4])
+{
+   unsigned i;
+
+   for (i = 0; i < 4; i++) {
+      switch (swz[i]) {
+      case UTIL_FORMAT_SWIZZLE_X:
+         dst[0] = src[i];
+         break;
+      case UTIL_FORMAT_SWIZZLE_Y:
+         dst[1] = src[i];
+         break;
+      case UTIL_FORMAT_SWIZZLE_Z:
+         dst[2] = src[i];
+         break;
+      case UTIL_FORMAT_SWIZZLE_W:
+         dst[3] = src[i];
+         break;
+      }
+   }
+}
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index bb3ed72e932..566fa79e781 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -815,6 +815,25 @@ util_format_translate(enum pipe_format dst_format,
                       unsigned src_x, unsigned src_y,
                       unsigned width, unsigned height);
 
+/*
+ * Swizzle operations.
+ */
+
+/* Compose two sets of swizzles.
+ * If V is a 4D vector and the function parameters represent functions that
+ * swizzle vector components, this holds:
+ *     swz2(swz1(V)) = dst(V)
+ */
+void util_format_compose_swizzles(const unsigned char swz1[4],
+                                  const unsigned char swz2[4],
+                                  unsigned char dst[4]);
+
+void util_format_swizzle_4f(float *dst, const float *src,
+                            const unsigned char swz[4]);
+
+void util_format_unswizzle_4f(float *dst, const float *src,
+                              const unsigned char swz[4]);
+
 #ifdef __cplusplus
 } // extern "C" {
 #endif
diff --git a/src/gallium/drivers/r300/r300_fs.c b/src/gallium/drivers/r300/r300_fs.c
index a9fd3ad40dd..6f21125f70a 100644
--- a/src/gallium/drivers/r300/r300_fs.c
+++ b/src/gallium/drivers/r300/r300_fs.c
@@ -180,9 +180,10 @@ static void get_external_state(
             v->base.format == PIPE_FORMAT_LATC1_SNORM) {
             unsigned char swizzle[4];
 
-            util_format_combine_swizzles(swizzle,
+            util_format_compose_swizzles(
                             util_format_description(v->base.format)->swizzle,
-                            v->swizzle);
+                            v->swizzle,
+                            swizzle);
 
             state->unit[i].texture_swizzle =
                     RC_MAKE_SWIZZLE(swizzle[0], swizzle[1],
diff --git a/src/gallium/drivers/r300/r300_state_derived.c b/src/gallium/drivers/r300/r300_state_derived.c
index f63114e7eb7..45c11fce1fe 100644
--- a/src/gallium/drivers/r300/r300_state_derived.c
+++ b/src/gallium/drivers/r300/r300_state_derived.c
@@ -605,7 +605,6 @@ static uint32_t r300_get_border_color(enum pipe_format format,
 {
     const struct util_format_description *desc;
     float border_swizzled[4] = {0};
-    unsigned i;
     union util_color uc = {0};
 
     desc = util_format_description(format);
@@ -629,22 +628,7 @@ static uint32_t r300_get_border_color(enum pipe_format format,
     }
 
     /* Apply inverse swizzle of the format. */
-    for (i = 0; i < 4; i++) {
-        switch (desc->swizzle[i]) {
-        case UTIL_FORMAT_SWIZZLE_X:
-            border_swizzled[0] = border[i];
-            break;
-        case UTIL_FORMAT_SWIZZLE_Y:
-            border_swizzled[1] = border[i];
-            break;
-        case UTIL_FORMAT_SWIZZLE_Z:
-            border_swizzled[2] = border[i];
-            break;
-        case UTIL_FORMAT_SWIZZLE_W:
-            border_swizzled[3] = border[i];
-            break;
-        }
-    }
+    util_format_unswizzle_4f(border_swizzled, border, desc->swizzle);
 
     /* Compressed formats. */
     if (util_format_is_compressed(format)) {
diff --git a/src/gallium/drivers/r300/r300_texture.c b/src/gallium/drivers/r300/r300_texture.c
index 08fccbe51c5..fc84004fb97 100644
--- a/src/gallium/drivers/r300/r300_texture.c
+++ b/src/gallium/drivers/r300/r300_texture.c
@@ -38,18 +38,6 @@
 
 #include "pipe/p_screen.h"
 
-void util_format_combine_swizzles(unsigned char *dst,
-                                  const unsigned char *swz1,
-                                  const unsigned char *swz2)
-{
-    unsigned i;
-
-    for (i = 0; i < 4; i++) {
-        dst[i] = swz2[i] <= UTIL_FORMAT_SWIZZLE_W ?
-                 swz1[swz2[i]] : swz2[i];
-    }
-}
-
 unsigned r300_get_swizzle_combined(const unsigned char *swizzle_format,
                                    const unsigned char *swizzle_view,
                                    boolean dxtc_swizzle)
@@ -72,7 +60,7 @@ unsigned r300_get_swizzle_combined(const unsigned char *swizzle_format,
 
     if (swizzle_view) {
         /* Combine two sets of swizzles. */
-        util_format_combine_swizzles(swizzle, swizzle_format, swizzle_view);
+        util_format_compose_swizzles(swizzle_format, swizzle_view, swizzle);
     } else {
         memcpy(swizzle, swizzle_format, 4);
     }
diff --git a/src/gallium/drivers/r300/r300_texture.h b/src/gallium/drivers/r300/r300_texture.h
index 4586bb2e4dc..158a387478f 100644
--- a/src/gallium/drivers/r300/r300_texture.h
+++ b/src/gallium/drivers/r300/r300_texture.h
@@ -35,10 +35,6 @@ struct r300_texture_desc;
 struct r300_resource;
 struct r300_screen;
 
-void util_format_combine_swizzles(unsigned char *dst,
-                                  const unsigned char *swz1,
-                                  const unsigned char *swz2);
-
 unsigned r300_get_swizzle_combined(const unsigned char *swizzle_format,
                                    const unsigned char *swizzle_view,
                                    boolean dxtc_swizzle);
diff --git a/src/gallium/drivers/r600/r600_texture.c b/src/gallium/drivers/r600/r600_texture.c
index e9e8b277243..927eb5dafc9 100644
--- a/src/gallium/drivers/r600/r600_texture.c
+++ b/src/gallium/drivers/r600/r600_texture.c
@@ -754,11 +754,7 @@ static unsigned r600_get_swizzle_combined(const unsigned char *swizzle_format,
 	};
 
 	if (swizzle_view) {
-		/* Combine two sets of swizzles. */
-		for (i = 0; i < 4; i++) {
-			swizzle[i] = swizzle_view[i] <= UTIL_FORMAT_SWIZZLE_W ?
-				swizzle_format[swizzle_view[i]] : swizzle_view[i];
-		}
+		util_format_compose_swizzles(swizzle_format, swizzle_view, swizzle);
 	} else {
 		memcpy(swizzle, swizzle_format, 4);
 	}