[PATCH 05/19] 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 - the other path is only there for compatibility and
will go away (or at least rot to become buggy due to dis-use) in newer
hardware.

Preparation for GC7000 support.

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

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