1 files changed, 225 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/draw/draw_prim_assembler.c b/src/gallium/auxiliary/draw/draw_prim_assembler.c
new file mode 100644
index 00000000000..9bedeeadb44
--- /dev/null
+++ b/src/gallium/auxiliary/draw/draw_prim_assembler.c
@@ -0,0 +1,225 @@
+/**************************************************************************
+ *
+ * Copyright 2013 VMware, Inc.
+ * 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 VMWARE 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.
+ *
+ **************************************************************************/
+
+#include "draw_prim_assembler.h"
+
+#include "util/u_debug.h"
+#include "util/u_memory.h"
+#include "util/u_prim.h"
+
+#include "pipe/p_defines.h"
+
+struct draw_assembler
+{
+   struct draw_context *draw;
+
+   struct draw_prim_info *output_prims;
+   struct draw_vertex_info *output_verts;
+
+   const struct draw_prim_info *input_prims;
+   const struct draw_vertex_info *input_verts;
+};
+
+boolean
+draw_prim_assembler_is_required(const struct draw_context *draw,
+                                const struct draw_prim_info *prim_info,
+                                const struct draw_vertex_info *vert_info)
+{
+   switch (prim_info->prim) {
+   case PIPE_PRIM_LINES_ADJACENCY:
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+   case PIPE_PRIM_TRIANGLES_ADJACENCY:
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return TRUE;
+   default:
+      return FALSE;
+   }
+}
+
+/*
+ * Copy the vertex header along with its data from the current
+ * vertex buffer into a buffer holding vertices arranged
+ * into decomposed primitives (i.e. buffer without the
+ * adjacency vertices)
+ */
+static void
+copy_verts(struct draw_assembler *asmblr,
+           unsigned *indices, unsigned num_indices)
+{
+   unsigned i;
+
+   char *output = (char*)asmblr->output_verts->verts;
+   const char *input = (const char*)asmblr->input_verts->verts;
+
+   for (i = 0; i < num_indices; ++i) {
+      unsigned idx = indices[i];
+      unsigned output_offset =
+         asmblr->output_verts->count * asmblr->output_verts->stride;
+      unsigned input_offset = asmblr->input_verts->stride * idx;
+      memcpy(output + output_offset, input + input_offset,
+             asmblr->input_verts->vertex_size);
+      asmblr->output_verts->count += 1;
+   }
+}
+
+static void
+prim_point(struct draw_assembler *asmblr,
+           unsigned idx)
+{
+   unsigned indices[1];
+
+   indices[0] = idx;
+
+   copy_verts(asmblr, indices, 1);
+}
+
+static void
+prim_line(struct draw_assembler *asmblr,
+          unsigned i0, unsigned i1)
+{
+   unsigned indices[2];
+
+   indices[0] = i0;
+   indices[1] = i1;
+
+   copy_verts(asmblr, indices, 2);
+}
+
+static void
+prim_line_adj(struct draw_assembler *asmblr,
+              unsigned i0, unsigned i1, unsigned i2, unsigned i3)
+{
+   unsigned indices[2];
+
+   indices[0] = i1;
+   indices[1] = i2;
+
+   copy_verts(asmblr, indices, 2);
+}
+
+static void
+prim_tri(struct draw_assembler *asmblr,
+         unsigned i0, unsigned i1, unsigned i2)
+{
+   unsigned indices[3];
+
+   indices[0] = i0;
+   indices[1] = i1;
+   indices[2] = i2;
+
+   copy_verts(asmblr, indices, 3);
+}
+
+static void
+prim_tri_adj(struct draw_assembler *asmblr,
+             unsigned i0, unsigned i1, unsigned i2,
+             unsigned i3, unsigned i4, unsigned i5)
+{
+   unsigned indices[3];
+
+   indices[0] = i0;
+   indices[1] = i2;
+   indices[2] = i4;
+
+   copy_verts(asmblr, indices, 3);
+}
+
+
+
+#define FUNC assembler_run_linear
+#define GET_ELT(idx) (start + (idx))
+#include "draw_prim_assembler_tmp.h"
+
+#define FUNC assembler_run_elts
+#define LOCAL_VARS   const ushort *elts = input_prims->elts;
+#define GET_ELT(idx) (elts[start + (idx)])
+#include "draw_prim_assembler_tmp.h"
+
+
+
+/*
+ * Primitive assembler breaks up adjacency primitives and assembles
+ * the base primitives they represent, e.g. vertices forming
+ * PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY
+ * become vertices forming PIPE_PRIM_TRIANGLES 
+ * This is needed because specification says that the adjacency
+ * primitives are only visible in the geometry shader so we need
+ * to get rid of them so that the rest of the pipeline can
+ * process the inputs.
+ */
+void
+draw_prim_assembler_run(struct draw_context *draw,
+                        const struct draw_prim_info *input_prims,
+                        const struct draw_vertex_info *input_verts,
+                        struct draw_prim_info *output_prims,
+                        struct draw_vertex_info *output_verts)
+{
+   struct draw_assembler asmblr;
+   unsigned start, i;
+   unsigned assembled_prim = u_assembled_prim(input_prims->prim);
+   unsigned max_primitives = u_decomposed_prims_for_vertices(
+      input_prims->prim, input_prims->count);
+   unsigned max_verts = u_vertices_per_prim(assembled_prim) * max_primitives;
+
+   asmblr.draw = draw;
+   asmblr.output_prims = output_prims;
+   asmblr.output_verts = output_verts;
+   asmblr.input_prims = input_prims;
+   asmblr.input_verts = input_verts;
+
+   output_prims->linear = TRUE;
+   output_prims->elts = NULL;
+   output_prims->start = 0;
+   output_prims->prim = u_assembled_prim(input_prims->prim);
+   output_prims->flags = 0x0;
+   output_prims->primitive_lengths = MALLOC(sizeof(unsigned));
+   output_prims->primitive_lengths[0] = 0;
+   output_prims->primitive_count = 1;
+
+   output_verts->vertex_size = input_verts->vertex_size;
+   output_verts->stride = input_verts->stride;
+   output_verts->verts = (struct vertex_header*)MALLOC(
+      input_verts->vertex_size * max_verts);
+   output_verts->count = 0;
+
+
+   for (start = i = 0; i < input_prims->primitive_count;
+        start += input_prims->primitive_lengths[i], i++)
+   {
+      unsigned count = input_prims->primitive_lengths[i];
+      if (input_prims->linear) {
+         assembler_run_linear(&asmblr, input_prims, input_verts,
+                              start, count);
+      } else {
+         assembler_run_elts(&asmblr, input_prims, input_verts,
+                            start, count);
+      }
+   }
+
+   output_prims->primitive_lengths[0] = output_verts->count;
+   output_prims->count = output_verts->count;
+}