draw: implement support for multiple viewports

This adds support for multiple viewports to the draw module.
Multiple viewports depend on the presence of geometry shaders
which can write the viewport index.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: José Fonseca<jfonseca@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/draw/draw_gs.c b/src/gallium/auxiliary/draw/draw_gs.c
index fa0981e..67e5117 100644
--- a/src/gallium/auxiliary/draw/draw_gs.c
+++ b/src/gallium/auxiliary/draw/draw_gs.c
@@ -335,8 +335,13 @@ llvm_fetch_gs_outputs(struct draw_geometry_shader *shader,
       int i;
       for (i = 0; i < total_verts; ++i) {
          struct vertex_header *vh = (struct vertex_header *)(output_ptr + shader->vertex_size * i);
-         debug_printf("%d) [%f, %f, %f, %f]\n", i,
-                      vh->data[0][0], vh->data[0][1], vh->data[0][2], vh->data[0][3]);
+         debug_printf("%d) Vertex:\n", i);
+         for (j = 0; j < shader->info.num_outputs; ++j) {
+            unsigned *udata = (unsigned*)vh->data[j];
+            debug_printf("    %d) [%f, %f, %f, %f] [%d, %d, %d, %d]\n", j,
+                         vh->data[j][0], vh->data[j][1], vh->data[j][2], vh->data[j][3],
+                         udata[0], udata[1], udata[2], udata[3]);
+         }
          
       }
    }
@@ -784,6 +789,8 @@ draw_create_geometry_shader(struct draw_context *draw,
       if (gs->info.output_semantic_name[i] == TGSI_SEMANTIC_POSITION &&
           gs->info.output_semantic_index[i] == 0)
          gs->position_output = i;
+      if (gs->info.output_semantic_name[i] == TGSI_SEMANTIC_VIEWPORT_INDEX)
+         gs->viewport_index_output = i;
    }
 
    gs->machine = draw->gs.tgsi.machine;