Mesa (master): st/mesa: add support for indirect drawing

[Marek Olšák]

Module: Mesa
Branch: master
Commit: b97b87940b1f7e093325ece4c1dd97b1d56835a1
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b97b87940b1f7e093325ece4c1dd97b1d56835a1

Author: Christoph Bumiller <e0425955 at student.tuwien.ac.at>
Date:   Fri Apr  5 14:29:37 2013 +0200

st/mesa: add support for indirect drawing

---

 src/mesa/state_tracker/st_cb_bufferobjects.c |    3 +++
 src/mesa/state_tracker/st_draw.c             |   11 ++++++++++-
 src/mesa/state_tracker/st_extensions.c       |    1 +
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/mesa/state_tracker/st_cb_bufferobjects.c b/src/mesa/state_tracker/st_cb_bufferobjects.c
index 0262461..3b4d28d 100644
--- a/src/mesa/state_tracker/st_cb_bufferobjects.c
+++ b/src/mesa/state_tracker/st_cb_bufferobjects.c
@@ -225,6 +225,9 @@ st_bufferobj_data(struct gl_context *ctx,
    case GL_UNIFORM_BUFFER:
       bind = PIPE_BIND_CONSTANT_BUFFER;
       break;
+   case GL_DRAW_INDIRECT_BUFFER:
+      bind = PIPE_BIND_COMMAND_ARGS_BUFFER;
+      break;
    default:
       bind = 0;
    }
diff --git a/src/mesa/state_tracker/st_draw.c b/src/mesa/state_tracker/st_draw.c
index c8189fa..64d6ef5 100644
--- a/src/mesa/state_tracker/st_draw.c
+++ b/src/mesa/state_tracker/st_draw.c
@@ -244,6 +244,14 @@ st_draw_vbo(struct gl_context *ctx,
       }
    }
 
+   if (indirect) {
+      info.indirect = st_buffer_object(indirect)->buffer;
+
+      /* Primitive restart is not handled by the VBO module in this case. */
+      info.primitive_restart = ctx->Array._PrimitiveRestart;
+      info.restart_index = ctx->Array.RestartIndex;
+   }
+
    /* do actual drawing */
    for (i = 0; i < nr_prims; i++) {
       info.mode = translate_prim(ctx, prims[i].mode);
@@ -256,6 +264,7 @@ st_draw_vbo(struct gl_context *ctx,
          info.min_index = info.start;
          info.max_index = info.start + info.count - 1;
       }
+      info.indirect_offset = prims[i].indirect_offset;
 
       if (ST_DEBUG & DEBUG_DRAW) {
          debug_printf("st/draw: mode %s  start %u  count %u  indexed %d\n",
@@ -265,7 +274,7 @@ st_draw_vbo(struct gl_context *ctx,
                       info.indexed);
       }
 
-      if (info.count_from_stream_output) {
+      if (info.count_from_stream_output || info.indirect) {
          cso_draw_vbo(st->cso_context, &info);
       }
       else if (info.primitive_restart) {
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index 3b6681e..bfad04f 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -432,6 +432,7 @@ void st_init_extensions(struct st_context *st)
       { o(ARB_texture_multisample),          PIPE_CAP_TEXTURE_MULTISAMPLE              },
       { o(ARB_texture_query_lod),            PIPE_CAP_TEXTURE_QUERY_LOD                },
       { o(ARB_sample_shading),               PIPE_CAP_SAMPLE_SHADING                   },
+      { o(ARB_draw_indirect),                PIPE_CAP_DRAW_INDIRECT                    }
    };
 
    /* Required: render target and sampler support */