4 files changed, 88 insertions, 0 deletions
diff --git a/src/mesa/pipe/softpipe/sp_context.h b/src/mesa/pipe/softpipe/sp_context.h
index d01fc38b81..329544eb74 100644
--- a/src/mesa/pipe/softpipe/sp_context.h
+++ b/src/mesa/pipe/softpipe/sp_context.h
@@ -138,6 +138,7 @@ struct softpipe_context {
     */
    struct {
       struct quad_stage *shade;
+      struct quad_stage *alpha_test;
       struct quad_stage *depth_test;
       struct quad_stage *blend;
       struct quad_stage *output;
diff --git a/src/mesa/pipe/softpipe/sp_quad.c b/src/mesa/pipe/softpipe/sp_quad.c
index 32085ab8c4..63126a4da3 100644
--- a/src/mesa/pipe/softpipe/sp_quad.c
+++ b/src/mesa/pipe/softpipe/sp_quad.c
@@ -21,6 +21,11 @@ sp_build_quad_pipeline(struct softpipe_context *sp)
       sp->quad.first = sp->quad.depth_test;
    }
 
+   if (sp->alpha_test.enabled) {
+      sp->quad.alpha_test->next = sp->quad.first;
+      sp->quad.first = sp->quad.alpha_test;
+   }
+
    /* XXX always enable shader? */
    if (1) {
       sp->quad.shade->next = sp->quad.first;
diff --git a/src/mesa/pipe/softpipe/sp_quad.h b/src/mesa/pipe/softpipe/sp_quad.h
index 86c17180bf..351cd4d323 100644
--- a/src/mesa/pipe/softpipe/sp_quad.h
+++ b/src/mesa/pipe/softpipe/sp_quad.h
@@ -46,6 +46,7 @@ struct quad_stage {
 
 
 struct quad_stage *sp_quad_shade_stage( struct softpipe_context *softpipe );
+struct quad_stage *sp_quad_alpha_test_stage( struct softpipe_context *softpipe );
 struct quad_stage *sp_quad_depth_test_stage( struct softpipe_context *softpipe );
 struct quad_stage *sp_quad_blend_stage( struct softpipe_context *softpipe );
 struct quad_stage *sp_quad_output_stage( struct softpipe_context *softpipe );
diff --git a/src/mesa/pipe/softpipe/sp_quad_alpha_test.c b/src/mesa/pipe/softpipe/sp_quad_alpha_test.c
new file mode 100644
index 0000000000..f7cebca6ea
--- /dev/null
+++ b/src/mesa/pipe/softpipe/sp_quad_alpha_test.c
@@ -0,0 +1,81 @@
+
+/**
+ * quad alpha test
+ */
+
+#include "glheader.h"
+#include "imports.h"
+#include "sp_context.h"
+#include "sp_headers.h"
+#include "sp_quad.h"
+#include "pipe/p_defines.h"
+
+
+static void
+alpha_test_quad(struct quad_stage *qs, struct quad_header *quad)
+{
+   struct softpipe_context *softpipe = qs->softpipe;
+   GLuint j;
+   struct softpipe_surface *sps = softpipe_surface(softpipe->framebuffer.zbuf);
+   const GLfloat ref = softpipe->alpha_test.ref;
+
+#if 0
+   assert(sps); /* shouldn't get here if there's no zbuffer */
+#else
+   if (!sps)
+      return;
+#endif
+
+   switch (softpipe->alpha_test.func) {
+   case PIPE_FUNC_NEVER:
+      quad->mask = 0x0;
+      break;
+   case PIPE_FUNC_LESS:
+      for (j = 0; j < QUAD_SIZE; j++) {
+         if (quad->mask & (1 << j)) {
+            if (quad->outputs.color[3][j] >= ref) {
+               /* fail */
+               quad->mask &= (1 << j);
+            }
+         }
+      }
+      break;
+   case PIPE_FUNC_EQUAL:
+      for (j = 0; j < QUAD_SIZE; j++) {
+         if (quad->mask & (1 << j)) {
+            if (quad->outputs.color[3][j] != ref) {
+               /* fail */
+               quad->mask &= (1 << j);
+            }
+         }
+      }
+      break;
+   case PIPE_FUNC_LEQUAL:
+      for (j = 0; j < QUAD_SIZE; j++) {
+         if (quad->mask & (1 << j)) {
+            if (quad->outputs.color[3][j] > ref) {
+               /* fail */
+               quad->mask &= (1 << j);
+            }
+         }
+      }
+      break;
+      /* XXX fill in remaining cases */
+   default:
+      abort();
+   }
+
+   qs->next->run(qs->next, quad);
+}
+
+
+struct quad_stage *
+sp_quad_alpha_test_stage( struct softpipe_context *softpipe )
+{
+   struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
+
+   stage->softpipe = softpipe;
+   stage->run = alpha_test_quad;
+
+   return stage;
+}