1 files changed, 118 insertions, 0 deletions
diff --git a/src/mesa/pipe/softpipe/sp_z_surface.c b/src/mesa/pipe/softpipe/sp_z_surface.c
new file mode 100644
index 0000000000..662a4a15ee
--- /dev/null
+++ b/src/mesa/pipe/softpipe/sp_z_surface.c
@@ -0,0 +1,118 @@
+/**************************************************************************
+ * 
+ * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+
+/**
+ * Software Z buffer/surface.
+ *
+ * \author Brian Paul
+ */
+
+
+#include "main/imports.h"
+#include "pipe/p_state.h"
+#include "pipe/p_defines.h"
+#include "sp_surface.h"
+#include "sp_z_surface.h"
+
+static void*
+z16_map(struct pipe_buffer *pb, GLuint access_mode)
+{
+   struct softpipe_surface *sps = (struct softpipe_surface *) pb;
+   sps->surface.ptr = pb->ptr;
+   return pb->ptr;
+}
+
+static void
+z16_unmap(struct pipe_buffer *pb)
+{
+   struct softpipe_surface *sps = (struct softpipe_surface *) pb;
+   sps->surface.ptr = NULL;
+}
+
+static void
+z16_resize(struct pipe_surface *ps, GLuint width, GLuint height)
+{
+   struct softpipe_surface *sps = (struct softpipe_surface *) ps;
+
+   if (sps->surface.buffer.ptr)
+      free(sps->surface.buffer.ptr);
+
+   ps->buffer.ptr = (GLubyte *) malloc(width * height * sizeof(GLushort));
+   ps->width = width;
+   ps->height = height;
+
+   sps->surface.stride = sps->surface.width;
+   sps->surface.cpp = 2;
+}
+
+static void
+z16_read_quad_z(struct softpipe_surface *sps,
+                GLint x, GLint y, GLuint zzzz[QUAD_SIZE])
+{
+   const GLushort *src
+      = (GLushort *) sps->surface.ptr + y * sps->surface.stride + x;
+
+   /* converting GLushort to GLuint: */
+   zzzz[0] = src[0];
+   zzzz[1] = src[1];
+   zzzz[2] = src[sps->surface.width];
+   zzzz[3] = src[sps->surface.width + 1];
+}
+
+static void
+z16_write_quad_z(struct softpipe_surface *sps,
+                 GLint x, GLint y, const GLuint zzzz[QUAD_SIZE])
+{
+   GLushort *dst = (GLushort *) sps->surface.ptr + y * sps->surface.stride + x;
+
+   /* converting GLuint to GLushort: */
+   dst[0] = zzzz[0];
+   dst[1] = zzzz[1];
+   dst[sps->surface.width] = zzzz[2];
+   dst[sps->surface.width + 1] = zzzz[3];
+}
+
+struct softpipe_surface *
+softpipe_new_z_surface(GLuint depth)
+{
+   struct softpipe_surface *sps = CALLOC_STRUCT(softpipe_surface);
+   if (!sps)
+      return NULL;
+
+   /* XXX ignoring depth param for now */
+
+   sps->surface.format = PIPE_FORMAT_U_Z16;
+
+   sps->surface.resize = z16_resize;
+   sps->surface.buffer.map = z16_map;
+   sps->surface.buffer.unmap = z16_unmap;
+   sps->read_quad_z = z16_read_quad_z;
+   sps->write_quad_z = z16_write_quad_z;
+
+   return sps;
+}