From 8c1472bc84dd6c7b55039aae3fe67248e051eb21 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Thu, 9 Dec 2021 13:57:08 +1000
Subject: [PATCH] mesa/bufferobj: move invalidate buffer to optional feature
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Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14133>
---
 src/mesa/main/bufferobj.c           | 26 ++++++++++++++++++++++++--
 src/mesa/main/mtypes.h              |  1 +
 src/mesa/state_tracker/st_context.c |  3 +++
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 89b158b..512d222 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -5179,13 +5179,35 @@ _mesa_BindBuffersBase(GLenum target, GLuint first, GLsizei count,
    }
 }
 
+/**
+ * Called via glInvalidateBuffer(Sub)Data.
+ */
+static void
+bufferobj_invalidate(struct gl_context *ctx,
+                     struct gl_buffer_object *obj,
+                     GLintptr offset,
+                     GLsizeiptr size)
+{
+   struct pipe_context *pipe = ctx->pipe;
+
+   /* We ignore partial invalidates. */
+   if (offset != 0 || size != obj->Size)
+      return;
+
+   /* If the buffer is mapped, we can't invalidate it. */
+   if (!obj->buffer || _mesa_bufferobj_mapped(obj, MAP_USER))
+      return;
+
+   pipe->invalidate_resource(pipe, obj->buffer);
+}
+
 static ALWAYS_INLINE void
 invalidate_buffer_subdata(struct gl_context *ctx,
                           struct gl_buffer_object *bufObj, GLintptr offset,
                           GLsizeiptr length)
 {
-   if (ctx->Driver.InvalidateBufferSubData)
-      ctx->Driver.InvalidateBufferSubData(ctx, bufObj, offset, length);
+   if (ctx->has_invalidate_buffer)
+      bufferobj_invalidate(ctx, bufObj, offset, length);
 }
 
 void GLAPIENTRY
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 7d361ce..e658535 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -5577,6 +5577,7 @@ struct gl_context
    struct pipe_context *pipe;
    struct st_config_options *st_opts;
    struct cso_context *cso_context;
+   bool has_invalidate_buffer;
    /*@}*/
 
    /**
diff --git a/src/mesa/state_tracker/st_context.c b/src/mesa/state_tracker/st_context.c
index 6ef02b1..f522dc3 100644
--- a/src/mesa/state_tracker/st_context.c
+++ b/src/mesa/state_tracker/st_context.c
@@ -995,6 +995,9 @@ st_create_context(gl_api api, struct pipe_context *pipe,
    if (debug_get_option_mesa_mvp_dp4())
       ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].OptimizeForAOS = GL_TRUE;
 
+   if (pipe->screen->get_param(pipe->screen, PIPE_CAP_INVALIDATE_BUFFER))
+      ctx->has_invalidate_buffer = true;
+
    st = st_create_context_priv(ctx, pipe, options, no_error);
    if (!st) {
       _mesa_free_context_data(ctx, true);
-- 
2.7.4