[PATCH v2 04/17] etnaviv: Use only DRAW_INSTANCED on GC3000+

[Wladimir J. van der Laan]

The blob does this, as DRAW_INSTANCED can replace fully all the other
draw commands. It is also required to handle integer vertex formats.
The other path is only there for compatibility and might go away (or at
least rot to become buggy due to dis-use) in newer hardware.

As a by-effect this changes the behavior for GC3000-, by no longer using
the index offset for DRAW_INDEXED but instead adding it to INDEX_ADDR.
This should make no difference.

Preparation for GC7000 support.

Signed-off-by: Wladimir J. van der Laan <laanwj at gmail.com>
Reviewed-by: Philipp Zabel <p.zabel at pengutronix.de>
---
 src/gallium/drivers/etnaviv/etnaviv_context.c | 16 ++++++++++++----
 src/gallium/drivers/etnaviv/etnaviv_emit.h    | 21 +++++++++++++++++++++
 2 files changed, 33 insertions(+), 4 deletions(-)

Unchanged since v1, only commit message updated as noted by Philipp Zabel.

diff --git a/src/gallium/drivers/etnaviv/etnaviv_context.c b/src/gallium/drivers/etnaviv/etnaviv_context.c
index 65c20d2..5aa9c66 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_context.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_context.c
@@ -188,6 +188,8 @@ etna_draw_vbo(struct pipe_context *pctx, const struct pipe_draw_info *info)
          BUG("Index buffer upload failed.");
          return;
       }
+      /* Add start to index offset, when rendering indexed */
+      index_offset += info->start * info->index_size;
 
       ctx->index_buffer.FE_INDEX_STREAM_BASE_ADDR.bo = etna_resource(indexbuf)->bo;
       ctx->index_buffer.FE_INDEX_STREAM_BASE_ADDR.offset = index_offset;
@@ -273,10 +275,16 @@ etna_draw_vbo(struct pipe_context *pctx, const struct pipe_draw_info *info)
    /* First, sync state, then emit DRAW_PRIMITIVES or DRAW_INDEXED_PRIMITIVES */
    etna_emit_state(ctx);
 
-   if (info->index_size)
-      etna_draw_indexed_primitives(ctx->stream, draw_mode, info->start, prims, info->index_bias);
-   else
-      etna_draw_primitives(ctx->stream, draw_mode, info->start, prims);
+   if (ctx->specs.halti >= 2) {
+      /* On HALTI2+ (GC3000 and higher) only use instanced drawing commands, as the blob does */
+      etna_draw_instanced(ctx->stream, info->index_size, draw_mode, 1,
+         info->count, info->index_size ? info->index_bias : info->start);
+   } else {
+      if (info->index_size)
+         etna_draw_indexed_primitives(ctx->stream, draw_mode, 0, prims, info->index_bias);
+      else
+         etna_draw_primitives(ctx->stream, draw_mode, info->start, prims);
+   }
 
    if (DBG_ENABLED(ETNA_DBG_DRAW_STALL)) {
       /* Stall the FE after every draw operation.  This allows better
diff --git a/src/gallium/drivers/etnaviv/etnaviv_emit.h b/src/gallium/drivers/etnaviv/etnaviv_emit.h
index e0c0eda..3c3d129 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_emit.h
+++ b/src/gallium/drivers/etnaviv/etnaviv_emit.h
@@ -117,6 +117,27 @@ etna_draw_indexed_primitives(struct etna_cmd_stream *stream,
    etna_cmd_stream_emit(stream, 0);
 }
 
+/* important: this takes a vertex count, not a primitive count */
+static inline void
+etna_draw_instanced(struct etna_cmd_stream *stream,
+                    uint32_t indexed, uint32_t primitive_type,
+                    uint32_t instance_count,
+                    uint32_t vertex_count, uint32_t offset)
+{
+   etna_cmd_stream_reserve(stream, 3 + 1);
+   etna_cmd_stream_emit(stream,
+      VIV_FE_DRAW_INSTANCED_HEADER_OP_DRAW_INSTANCED |
+      COND(indexed, VIV_FE_DRAW_INSTANCED_HEADER_INDEXED) |
+      VIV_FE_DRAW_INSTANCED_HEADER_TYPE(primitive_type) |
+      VIV_FE_DRAW_INSTANCED_HEADER_INSTANCE_COUNT_LO(instance_count & 0xffff));
+   etna_cmd_stream_emit(stream,
+      VIV_FE_DRAW_INSTANCED_COUNT_INSTANCE_COUNT_HI(instance_count >> 16) |
+      VIV_FE_DRAW_INSTANCED_COUNT_VERTEX_COUNT(vertex_count));
+   etna_cmd_stream_emit(stream,
+      VIV_FE_DRAW_INSTANCED_START_INDEX(offset));
+   etna_cmd_stream_emit(stream, 0);
+}
+
 void
 etna_emit_state(struct etna_context *ctx);
 
-- 
2.7.4