1 files changed, 48 insertions, 0 deletions
diff --git a/src/mesa/pipe/softpipe/sp_quad_stipple.c b/src/mesa/pipe/softpipe/sp_quad_stipple.c
new file mode 100644
index 0000000000..cad1a1400c
--- /dev/null
+++ b/src/mesa/pipe/softpipe/sp_quad_stipple.c
@@ -0,0 +1,48 @@
+
+/**
+ * quad polygon stipple stage
+ */
+
+#include "glheader.h"
+#include "imports.h"
+#include "sp_context.h"
+#include "sp_headers.h"
+#include "sp_quad.h"
+#include "pipe/p_defines.h"
+
+
+/**
+ * Apply polygon stipple to quads produced by triangle rasterization
+ */
+static void
+stipple_quad(struct quad_stage *qs, struct quad_header *quad)
+{
+   if (quad->prim == PRIM_TRI) {
+      struct softpipe_context *softpipe = qs->softpipe;
+      const GLint col0 = quad->x0 % 32;
+      const GLint row0 = quad->y0 % 32;
+      const GLuint stipple0 = softpipe->poly_stipple.stipple[row0];
+      const GLuint stipple1 = softpipe->poly_stipple.stipple[row0 + 1];
+
+      /* XXX there may be a better way to lay out the stored stipple
+       * values to further simplify this computation.
+       */
+      quad->mask &= (((stipple0 >> col0) & 0x3) | 
+                     (((stipple1 >> col0) & 0x3) << 2));
+
+      if (quad->mask)
+         qs->next->run(qs->next, quad);
+   }
+}
+
+
+struct quad_stage *
+sp_quad_polygon_stipple_stage( struct softpipe_context *softpipe )
+{
+   struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
+
+   stage->softpipe = softpipe;
+   stage->run = stipple_quad;
+
+   return stage;
+}