This fixes rendering in Supertuxkart, Serious Sam 3, and Shadow Warrior
via virgl for me. So for the series:
Tested-By: Gert Wollny <gert.wol...@collabora.com>
Am Dienstag, den 11.12.2018, 15:26 +0100 schrieb Erik Faye-Lund:
> Virglrenderer does the wrong thing when given an instance divisor;
> it tries to use the element-index rather than the binding-index as
> the argument to glVertexBindingDivisor(). This worked fine as long
> as there was a 1:1 relationship between elements and bindings,
> which was the case util 19a91841c34 "st/mesa: Use Array._DrawVAO in
> st_atom_array.c.".
>
> So let's detect instance divisors, and restore a 1:1 relationship in
> that case. This will make old versions of virglrenderer behave
> correctly. For newer versions, we can consider making a better
> interface, where the instance divisor isn't specified per element,
> but rather per binding. But let's save that for another day.
>
> Signed-off-by: Erik Faye-Lund <erik.faye-l...@collabora.com>
> ---
> src/gallium/drivers/virgl/virgl_context.c | 29
> ++++++++++++++++++++++-
> 1 file changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/src/gallium/drivers/virgl/virgl_context.c
> b/src/gallium/drivers/virgl/virgl_context.c
> index 121d9139f28..ce72f73a0f6 100644
> --- a/src/gallium/drivers/virgl/virgl_context.c
> +++ b/src/gallium/drivers/virgl/virgl_context.c
> @@ -50,6 +50,8 @@
>
> struct virgl_vertex_elements_state {
> uint32_t handle;
> + uint8_t binding_map[PIPE_MAX_ATTRIBS];
> + uint8_t num_bindings;
> };
>
> static uint32_t next_handle;
> @@ -390,10 +392,24 @@ static void
> *virgl_create_vertex_elements_state(struct pipe_context *ctx,
> unsigned
> num_elements,
> const struct
> pipe_vertex_element *elements)
> {
> + struct pipe_vertex_element new_elements[PIPE_MAX_ATTRIBS];
> struct virgl_context *vctx = virgl_context(ctx);
> struct virgl_vertex_elements_state *state =
> CALLOC_STRUCT(virgl_vertex_elements_state);
>
> + for (int i = 0; i < num_elements; ++i) {
> + if (elements[i].instance_divisor) {
> + for (int j = 0; j < num_elements; ++j) {
> + new_elements[j] = elements[j];
> + new_elements[j].vertex_buffer_index = j;
> + state->binding_map[j] = elements[j].vertex_buffer_index;
> + }
> + elements = new_elements;
> + state->num_bindings = num_elements;
> + break;
> + }
> + }
> +
> state->handle = virgl_object_assign_handle();
> virgl_encoder_create_vertex_elements(vctx, state->handle,
> num_elements, elements);
> @@ -419,6 +435,7 @@ static void
> virgl_bind_vertex_elements_state(struct pipe_context *ctx,
> vctx->vertex_elements = state;
> virgl_encode_bind_object(vctx, state ? state->handle : 0,
> VIRGL_OBJECT_VERTEX_ELEMENTS);
> + vctx->vertex_array_dirty = TRUE;
> }
>
> static void virgl_set_vertex_buffers(struct pipe_context *ctx,
> @@ -438,7 +455,17 @@ static void virgl_set_vertex_buffers(struct
> pipe_context *ctx,
> static void virgl_hw_set_vertex_buffers(struct virgl_context *vctx)
> {
> if (vctx->vertex_array_dirty) {
> - virgl_encoder_set_vertex_buffers(vctx, vctx-
> >num_vertex_buffers, vctx->vertex_buffer);
> + struct virgl_vertex_elements_state *ve = vctx-
> >vertex_elements;
> +
> + if (ve->num_bindings) {
> + struct pipe_vertex_buffer vertex_buffers[PIPE_MAX_ATTRIBS];
> + for (int i = 0; i < ve->num_bindings; ++i)
> + vertex_buffers[i] = vctx->vertex_buffer[ve-
> >binding_map[i]];
> +
> + virgl_encoder_set_vertex_buffers(vctx, ve->num_bindings,
> vertex_buffers);
> + } else
> + virgl_encoder_set_vertex_buffers(vctx, vctx-
> >num_vertex_buffers, vctx->vertex_buffer);
> +
> virgl_attach_res_vertex_buffers(vctx);
> }
> }
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