Mesa (master): mesa: add unpacking code for MESA_FORMAT_Z32_FLOAT_S8X24_UINT

[Brian Paul]

Module: Mesa
Branch: master
Commit: a12d4d0398c437911720069d293b469c60c4488c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a12d4d0398c437911720069d293b469c60c4488c

Author: Brian Paul <brianp at vmware.com>
Date:   Fri Feb 28 07:55:04 2014 -0700

mesa: add unpacking code for MESA_FORMAT_Z32_FLOAT_S8X24_UINT

Fixes glGetTexImage() when converting from MESA_FORMAT_Z32_FLOAT_S8X24_UINT
to GL_UNSIGNED_INT_24_8.  Hit by the piglit
ext_packed_depth_stencil-getteximage test.

Cc: "10.0" "10.1" <mesa-stable at lists.freedesktop.org>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/main/format_unpack.c |   22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/mesa/main/format_unpack.c b/src/mesa/main/format_unpack.c
index c948a9d..276ba55 100644
--- a/src/mesa/main/format_unpack.c
+++ b/src/mesa/main/format_unpack.c
@@ -4189,11 +4189,30 @@ unpack_uint_24_8_depth_stencil_S8_Z24(const GLuint *src, GLuint *dst, GLuint n)
 }
 
 static void
+unpack_uint_24_8_depth_stencil_Z32_S8X24(const GLuint *src,
+                                         GLuint *dst, GLuint n)
+{
+   GLuint i;
+
+   for (i = 0; i < n; i++) {
+      /* 8 bytes per pixel (float + uint32) */
+      GLfloat zf = ((GLfloat *) src)[i * 2 + 0];
+      GLuint z24 = (GLuint) (zf * (GLfloat) 0xffffff);
+      GLuint s = src[i * 2 + 1] & 0xff;
+      dst[i] = (z24 << 8) | s;
+   }
+}
+
+static void
 unpack_uint_24_8_depth_stencil_Z24_S8(const GLuint *src, GLuint *dst, GLuint n)
 {
    memcpy(dst, src, n * 4);
 }
 
+/**
+ * Unpack depth/stencil returning as GL_UNSIGNED_INT_24_8.
+ * \param format  the source data format
+ */
 void
 _mesa_unpack_uint_24_8_depth_stencil_row(mesa_format format, GLuint n,
 					 const void *src, GLuint *dst)
@@ -4205,6 +4224,9 @@ _mesa_unpack_uint_24_8_depth_stencil_row(mesa_format format, GLuint n,
    case MESA_FORMAT_Z24_UNORM_S8_UINT:
       unpack_uint_24_8_depth_stencil_S8_Z24(src, dst, n);
       break;
+   case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
+      unpack_uint_24_8_depth_stencil_Z32_S8X24(src, dst, n);
+      break;
    default:
       _mesa_problem(NULL,
                     "bad format %s in _mesa_unpack_uint_24_8_depth_stencil_row",