draw: implement TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION

Required by Nine. Tested with util_run_tests.
It's added to softpipe, llvmpipe, and r300g/swtcl.

Tested-by: David Heidelberg <david@ixit.cz>

7 files changed, 44 insertions, 10 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c
index 7bd2d39..04cf5b7 100644
--- a/src/gallium/auxiliary/draw/draw_context.c
+++ b/src/gallium/auxiliary/draw/draw_context.c
@@ -254,21 +254,48 @@ void draw_set_zs_format(struct draw_context *draw, enum pipe_format format)
 }
 
 
-static void update_clip_flags( struct draw_context *draw )
+static bool
+draw_is_vs_window_space(struct draw_context *draw)
 {
-   draw->clip_xy = !draw->driver.bypass_clip_xy;
+   if (draw->vs.vertex_shader) {
+      struct tgsi_shader_info *info = &draw->vs.vertex_shader->info;
+
+      return info->properties[TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION] != 0;
+   }
+   return false;
+}
+
+
+void
+draw_update_clip_flags(struct draw_context *draw)
+{
+   bool window_space = draw_is_vs_window_space(draw);
+
+   draw->clip_xy = !draw->driver.bypass_clip_xy && !window_space;
    draw->guard_band_xy = (!draw->driver.bypass_clip_xy &&
                           draw->driver.guard_band_xy);
    draw->clip_z = (!draw->driver.bypass_clip_z &&
-                   draw->rasterizer && draw->rasterizer->depth_clip);
+                   draw->rasterizer && draw->rasterizer->depth_clip) &&
+                  !window_space;
    draw->clip_user = draw->rasterizer &&
-                     draw->rasterizer->clip_plane_enable != 0;
+                     draw->rasterizer->clip_plane_enable != 0 &&
+                     !window_space;
    draw->guard_band_points_xy = draw->guard_band_xy ||
                                 (draw->driver.bypass_clip_points &&
                                 (draw->rasterizer &&
                                  draw->rasterizer->point_tri_clip));
 }
 
+
+void
+draw_update_viewport_flags(struct draw_context *draw)
+{
+   bool window_space = draw_is_vs_window_space(draw);
+
+   draw->bypass_viewport = window_space || draw->identity_viewport;
+}
+
+
 /**
  * Register new primitive rasterization/rendering state.
  * This causes the drawing pipeline to be rebuilt.
@@ -282,7 +309,7 @@ void draw_set_rasterizer_state( struct draw_context *draw,
 
       draw->rasterizer = raster;
       draw->rast_handle = rast_handle;
-      update_clip_flags(draw);
+      draw_update_clip_flags(draw);
    }
 }
 
@@ -309,7 +336,7 @@ void draw_set_driver_clipping( struct draw_context *draw,
    draw->driver.bypass_clip_z = bypass_clip_z;
    draw->driver.guard_band_xy = guard_band_xy;
    draw->driver.bypass_clip_points = bypass_clip_points;
-   update_clip_flags(draw);
+   draw_update_clip_flags(draw);
 }
 
 
@@ -363,6 +390,7 @@ void draw_set_viewport_states( struct draw_context *draw,
        viewport->translate[0] == 0.0f &&
        viewport->translate[1] == 0.0f &&
        viewport->translate[2] == 0.0f);
+   draw_update_viewport_flags(draw);
 }
 
 
diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index dbaece3..8326072 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -1836,7 +1836,7 @@ draw_llvm_make_variant_key(struct draw_llvm *llvm, char *store)
    key->clip_xy = llvm->draw->clip_xy;
    key->clip_z = llvm->draw->clip_z;
    key->clip_user = llvm->draw->clip_user;
-   key->bypass_viewport = llvm->draw->identity_viewport;
+   key->bypass_viewport = llvm->draw->bypass_viewport;
    key->clip_halfz = llvm->draw->rasterizer->clip_halfz;
    key->need_edgeflags = (llvm->draw->vs.edgeflag_output ? TRUE : FALSE);
    key->ucp_enable = llvm->draw->rasterizer->clip_plane_enable;
diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h
index 37045eb..7b893cb 100644
--- a/src/gallium/auxiliary/draw/draw_private.h
+++ b/src/gallium/auxiliary/draw/draw_private.h
@@ -252,6 +252,7 @@ struct draw_context
 
    struct pipe_viewport_state viewports[PIPE_MAX_VIEWPORTS];
    boolean identity_viewport;
+   boolean bypass_viewport;
 
    /** Vertex shader state */
    struct {
@@ -478,6 +479,9 @@ void
 draw_stats_clipper_primitives(struct draw_context *draw,
                               const struct draw_prim_info *prim_info);
 
+void draw_update_clip_flags(struct draw_context *draw);
+void draw_update_viewport_flags(struct draw_context *draw);
+
 /** 
  * Return index i from the index buffer.
  * If the index buffer would overflow we return the
diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
index c675321..50f438c 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_emit.c
@@ -95,7 +95,7 @@ fse_prepare(struct draw_pt_middle_end *middle,
    fse->key.nr_elements = MAX2(fse->key.nr_outputs,     /* outputs - translate to hw format */
                                fse->key.nr_inputs);     /* inputs - fetch from api format */
 
-   fse->key.viewport = !draw->identity_viewport;
+   fse->key.viewport = !draw->bypass_viewport;
    fse->key.clip = draw->clip_xy || draw->clip_z || draw->clip_user;
    fse->key.const_vbuffers = 0;
 
diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c
index f518dee..5af845f 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline.c
@@ -117,7 +117,7 @@ fetch_pipeline_prepare(struct draw_pt_middle_end *middle,
                             draw->clip_user,
                             point_clip ? draw->guard_band_points_xy :
                                          draw->guard_band_xy,
-                            draw->identity_viewport,
+                            draw->bypass_viewport,
                             draw->rasterizer->clip_halfz,
                             (draw->vs.edgeflag_output ? TRUE : FALSE) );
 
diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
index cc83736..0dfafdc 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
@@ -162,7 +162,7 @@ llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
                             draw->clip_user,
                             point_clip ? draw->guard_band_points_xy :
                                          draw->guard_band_xy,
-                            draw->identity_viewport,
+                            draw->bypass_viewport,
                             draw->rasterizer->clip_halfz,
                             (draw->vs.edgeflag_output ? TRUE : FALSE) );
 
diff --git a/src/gallium/auxiliary/draw/draw_vs.c b/src/gallium/auxiliary/draw/draw_vs.c
index f24354e..1501942 100644
--- a/src/gallium/auxiliary/draw/draw_vs.c
+++ b/src/gallium/auxiliary/draw/draw_vs.c
@@ -122,6 +122,8 @@ draw_bind_vertex_shader(struct draw_context *draw,
       draw->vs.clipdistance_output[0] = dvs->clipdistance_output[0];
       draw->vs.clipdistance_output[1] = dvs->clipdistance_output[1];
       dvs->prepare( dvs, draw );
+      draw_update_clip_flags(draw);
+      draw_update_viewport_flags(draw);
    }
    else {
       draw->vs.vertex_shader = NULL;