1 files changed, 56 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..f9a3c0ba26
--- /dev/null
+++ b/src/mesa/pipe/softpipe/sp_quad_stipple.c
@@ -0,0 +1,56 @@
+
+/**
+ * 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)
+{
+   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];
+   GLbitfield mask = 0x0;
+
+   /* XXX this could be optimize a bit to use just two conditionals */
+   if ((1 << col0) & stipple0)
+      mask |= MASK_BOTTOM_LEFT;
+
+   if ((2 << col0) & stipple0)
+      mask |= MASK_BOTTOM_RIGHT;
+
+   if ((1 << col0) & stipple1)
+      mask |= MASK_TOP_LEFT;
+
+   if ((2 << col0) & stipple1)
+      mask |= MASK_TOP_RIGHT;
+
+   quad->mask &= mask;
+
+   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;
+}