tgsi/ureg: make the dst register match the src indirection

[mesa.git] / src / gallium / auxiliary / draw / draw_pipe_offset.c

diff --git a/src/gallium/auxiliary/draw/draw_pipe_offset.c b/src/gallium/auxiliary/draw/draw_pipe_offset.c
index e829492423e3b0e9275a0f13c498ebf9acc4858c..3578525051f463f74dd4e440d60b4de5628be0e8 100644 (file)
--- a/src/gallium/auxiliary/draw/draw_pipe_offset.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_offset.c
@@ -43,6 +43,7 @@ struct offset_stage {
 
    float scale;
    float units;
+   float clamp;
 };
 
 
@@ -90,6 +91,10 @@ static void do_offset_tri( struct draw_stage *stage,
 
    float zoffset = offset->units + MAX2(dzdx, dzdy) * offset->scale;
 
+   if (offset->clamp)
+      zoffset = (offset->clamp < 0.0f) ? MAX2(zoffset, offset->clamp) :
+                                         MIN2(zoffset, offset->clamp);
+
    /*
     * Note: we're applying the offset and clamping per-vertex.
     * Ideally, the offset is applied per-fragment prior to fragment shading.
@@ -122,9 +127,44 @@ static void offset_first_tri( struct draw_stage *stage,
                              struct prim_header *header )
 {
    struct offset_stage *offset = offset_stage(stage);
+   const struct pipe_rasterizer_state *rast = stage->draw->rasterizer;
+   unsigned fill_mode = rast->fill_front;
+   boolean do_offset;
+
+   if (rast->fill_back != rast->fill_front) {
+      /* Need to check for back-facing triangle */
+      boolean ccw = header->det < 0.0f;
+      if (ccw != rast->front_ccw)
+         fill_mode = rast->fill_back;
+   }
+
+   /* Now determine if we need to do offsetting for the point/line/fill mode */
+   switch (fill_mode) {
+   case PIPE_POLYGON_MODE_FILL:
+      do_offset = rast->offset_tri;
+      break;
+   case PIPE_POLYGON_MODE_LINE:
+      do_offset = rast->offset_line;
+      break;
+   case PIPE_POLYGON_MODE_POINT:
+      do_offset = rast->offset_point;
+      break;
+   default:
+      assert(!"invalid fill_mode in offset_first_tri()");
+      do_offset = rast->offset_tri;
+   }
+
+   if (do_offset) {
+      offset->scale = rast->offset_scale;
+      offset->clamp = rast->offset_clamp;
+      offset->units = (float) (rast->offset_units * stage->draw->mrd);
+   }
+   else {
+      offset->scale = 0.0f;
+      offset->clamp = 0.0f;
+      offset->units = 0.0f;
+   }
 
-   offset->units = (float) (stage->draw->rasterizer->offset_units * stage->draw->mrd);
-   offset->scale = stage->draw->rasterizer->offset_scale;
 
    stage->tri = offset_tri;
    stage->tri( stage, header );
@@ -163,8 +203,6 @@ struct draw_stage *draw_offset_stage( struct draw_context *draw )
    if (offset == NULL)
       goto fail;
 
-   draw_alloc_temp_verts( &offset->stage, 3 );
-
    offset->stage.draw = draw;
    offset->stage.name = "offset";
    offset->stage.next = NULL;
@@ -175,9 +213,12 @@ struct draw_stage *draw_offset_stage( struct draw_context *draw )
    offset->stage.reset_stipple_counter = offset_reset_stipple_counter;
    offset->stage.destroy = offset_destroy;
 
+   if (!draw_alloc_temp_verts( &offset->stage, 3 ))
+      goto fail;
+
    return &offset->stage;
 
- fail:
+fail:
    if (offset)
       offset->stage.destroy( &offset->stage );