frontend for rendering without elts

1 files changed, 144 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt_varray_tmp.h b/src/gallium/auxiliary/draw/draw_pt_varray_tmp.h
new file mode 100644
index 0000000000..b9a319b253
--- /dev/null
+++ b/src/gallium/auxiliary/draw/draw_pt_varray_tmp.h
@@ -0,0 +1,144 @@
+
+static void FUNC(struct draw_pt_front_end *frontend,
+                 pt_elt_func get_elt,
+                 const void *elts,
+                 unsigned count)
+{
+   struct varray_frontend *varray = (struct varray_frontend *)frontend;
+   struct draw_context *draw = varray->draw;
+   unsigned start = (unsigned)elts;
+
+   boolean flatfirst = (draw->rasterizer->flatshade &&
+                        draw->rasterizer->flatshade_first);
+   unsigned i, flags;
+
+#if 0
+   debug_printf("%s (%d) %d/%d\n", __FUNCTION__, draw->prim, start, count);
+#endif
+#if 0
+   debug_printf("INPUT PRIM = %d (start = %d, count = %d)\n", varray->input_prim,
+                start, count);
+#endif
+
+   for (i = 0; i < count; ++i) {
+      varray->fetch_elts[i] = start + i;
+   }
+   varray->fetch_count = count;
+
+   switch (varray->input_prim) {
+   case PIPE_PRIM_POINTS:
+      for (i = 0; i < count; i ++) {
+         POINT(varray, i + 0);
+      }
+      break;
+
+   case PIPE_PRIM_LINES:
+      for (i = 0; i+1 < count; i += 2) {
+         LINE(varray, DRAW_PIPE_RESET_STIPPLE,
+              i + 0, i + 1);
+      }
+      break;
+
+   case PIPE_PRIM_LINE_LOOP:
+      if (count >= 2) {
+         flags = DRAW_PIPE_RESET_STIPPLE;
+
+         for (i = 1; i < count; i++, flags = 0) {
+            LINE(varray, flags, i - 1, i);
+         }
+         LINE(varray, flags, i - 1, 0);
+      }
+      break;
+
+   case PIPE_PRIM_LINE_STRIP:
+      flags = DRAW_PIPE_RESET_STIPPLE;
+      for (i = 1; i < count; i++, flags = 0) {
+         LINE(varray, flags, i - 1, i);
+      }
+      break;
+
+   case PIPE_PRIM_TRIANGLES:
+      for (i = 0; i+2 < count; i += 3) {
+         TRIANGLE(varray, DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
+                  i + 0, i + 1, i + 2);
+      }
+      break;
+
+   case PIPE_PRIM_TRIANGLE_STRIP:
+      if (flatfirst) {
+         for (i = 0; i+2 < count; i++) {
+            TRIANGLE(varray, DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
+                     i + 0, i + 1 + (i&1), i + 2 - (i&1));
+         }
+      }
+      else {
+         for (i = 0; i+2 < count; i++) {
+            TRIANGLE(varray, DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
+                     i + 0 + (i&1), i + 1 - (i&1), i + 2);
+         }
+      }
+      break;
+
+   case PIPE_PRIM_TRIANGLE_FAN:
+      if (count >= 3) {
+         if (flatfirst) {
+            flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
+            for (i = 0; i+2 < count; i++) {
+               TRIANGLE(varray, flags, i + 1, i + 2, 0);
+            }
+         }
+         else {
+            flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
+            for (i = 0; i+2 < count; i++) {
+               TRIANGLE(varray, flags, 0, i + 1, i + 2);
+            }
+         }
+      }
+      break;
+
+   case PIPE_PRIM_QUADS:
+      for (i = 0; i+3 < count; i += 4) {
+         QUAD(varray, i + 0, i + 1, i + 2, i + 3);
+      }
+      break;
+
+   case PIPE_PRIM_QUAD_STRIP:
+      for (i = 0; i+3 < count; i += 2) {
+         QUAD(varray, i + 2, i + 0, i + 1, i + 3);
+      }
+      break;
+
+   case PIPE_PRIM_POLYGON:
+   {
+         /* These bitflags look a little odd because we submit the
+          * vertices as (1,2,0) to satisfy flatshade requirements.
+          */
+         const unsigned edge_first  = DRAW_PIPE_EDGE_FLAG_2;
+         const unsigned edge_middle = DRAW_PIPE_EDGE_FLAG_0;
+         const unsigned edge_last   = DRAW_PIPE_EDGE_FLAG_1;
+
+         flags = DRAW_PIPE_RESET_STIPPLE | edge_first | edge_middle;
+
+	 for (i = 0; i+2 < count; i++, flags = edge_middle) {
+
+            if (i + 3 == count)
+               flags |= edge_last;
+
+	    TRIANGLE(varray, flags, i + 1, i + 2, 0);
+	 }
+      }
+      break;
+
+   default:
+      assert(0);
+      break;
+   }
+
+   varray_flush(varray);
+}
+
+#undef TRIANGLE
+#undef QUAD
+#undef POINT
+#undef LINE
+#undef FUNC