1 files changed, 101 insertions, 0 deletions
diff --git a/src/mesa/pipe/draw/draw_vertex_fetch.c b/src/mesa/pipe/draw/draw_vertex_fetch.c
new file mode 100644
index 0000000000..0dbbdf17f2
--- /dev/null
+++ b/src/mesa/pipe/draw/draw_vertex_fetch.c
@@ -0,0 +1,101 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 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.
+ * 
+ **************************************************************************/
+
+ /*
+  * Authors:
+  *   Keith Whitwell <keith@tungstengraphics.com>
+  */
+
+#include "pipe/p_util.h"
+#include "draw_private.h"
+#include "draw_context.h"
+#include "draw_vertex.h"
+
+#include "pipe/tgsi/exec/tgsi_core.h"
+
+/**
+ * Fetch a float[4] vertex attribute from memory, doing format/type
+ * conversion as needed.
+ * XXX this might be a temporary thing.
+ */
+static void
+fetch_attrib4(const void *ptr, unsigned format, float attrib[4])
+{
+   /* defaults */
+   attrib[1] = 0.0;
+   attrib[2] = 0.0;
+   attrib[3] = 1.0;
+   switch (format) {
+   case PIPE_FORMAT_R32G32B32A32_FLOAT:
+      attrib[3] = ((float *) ptr)[3];
+      /* fall-through */
+   case PIPE_FORMAT_R32G32B32_FLOAT:
+      attrib[2] = ((float *) ptr)[2];
+      /* fall-through */
+   case PIPE_FORMAT_R32G32_FLOAT:
+      attrib[1] = ((float *) ptr)[1];
+      /* fall-through */
+   case PIPE_FORMAT_R32_FLOAT:
+      attrib[0] = ((float *) ptr)[0];
+      break;
+   default:
+      assert(0);
+   }
+}
+
+void draw_vertex_fetch( struct draw_context *draw,
+			struct tgsi_exec_machine *machine,
+			const unsigned *elts,
+			unsigned count )
+{
+   unsigned j;
+
+
+   /* load machine inputs */
+   for (j = 0; j < count; j++) {
+      unsigned attr;
+      for (attr = 0; attr < 16; attr++) {
+         if (draw->vertex_shader.inputs_read & (1 << attr)) {
+            unsigned buf = draw->vertex_element[attr].vertex_buffer_index;
+            const void *src
+               = (const void *) ((const ubyte *) draw->mapped_vbuffer[buf]
+                                 + draw->vertex_buffer[buf].buffer_offset
+                                 + draw->vertex_element[attr].src_offset
+                                 + elts[j] * draw->vertex_buffer[buf].pitch);
+            float p[4];
+
+            fetch_attrib4(src, draw->vertex_element[attr].src_format, p);
+
+            machine->Inputs[attr].xyzw[0].f[j] = p[0]; /*X*/
+            machine->Inputs[attr].xyzw[1].f[j] = p[1]; /*Y*/
+            machine->Inputs[attr].xyzw[2].f[j] = p[2]; /*Z*/
+            machine->Inputs[attr].xyzw[3].f[j] = p[3]; /*W*/
+         }
+      }
+   }
+}
+