Mesa (gallium-0.2): gallium: Read from PIPE_FORMAT_Z32_FLOAT.

[Jose Fonseca]

Module: Mesa
Branch: gallium-0.2
Commit: 7b42a5d634d32c3f15f3a3535b2b9328dfca49bf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7b42a5d634d32c3f15f3a3535b2b9328dfca49bf

Author: José Fonseca <jrfonseca at tungstengraphics.com>
Date:   Sat Oct 25 03:35:01 2008 +0900

gallium: Read from PIPE_FORMAT_Z32_FLOAT.

Mainly for debugging purposes for now.

---

 src/gallium/auxiliary/util/u_tile.c |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_tile.c b/src/gallium/auxiliary/util/u_tile.c
index 00c12ba..fa683b6 100644
--- a/src/gallium/auxiliary/util/u_tile.c
+++ b/src/gallium/auxiliary/util/u_tile.c
@@ -769,6 +769,32 @@ z24s8_get_tile_rgba(const unsigned *src,
 }
 
 
+/*** PIPE_FORMAT_Z32_FLOAT ***/
+
+/**
+ * Return each Z value as four floats in [0,1].
+ */
+static void
+z32f_get_tile_rgba(const float *src,
+                   unsigned w, unsigned h,
+                   float *p,
+                   unsigned dst_stride)
+{
+   unsigned i, j;
+
+   for (i = 0; i < h; i++) {
+      float *pRow = p;
+      for (j = 0; j < w; j++, pRow += 4) {
+         pRow[0] =
+         pRow[1] =
+         pRow[2] =
+         pRow[3] = *src++;
+      }
+      p += dst_stride;
+   }
+}
+
+
 /*** PIPE_FORMAT_YCBCR / PIPE_FORMAT_YCBCR_REV ***/
 
 /**
@@ -913,6 +939,9 @@ pipe_tile_raw_to_rgba(enum pipe_format format,
    case PIPE_FORMAT_Z24S8_UNORM:
       z24s8_get_tile_rgba((unsigned *) src, w, h, dst, dst_stride);
       break;
+   case PIPE_FORMAT_Z32_FLOAT:
+      z32f_get_tile_rgba((float *) src, w, h, dst, dst_stride);
+      break;
    case PIPE_FORMAT_YCBCR:
       ycbcr_get_tile_rgba((ushort *) src, w, h, dst, dst_stride, FALSE);
       break;