[Mesa-dev] [PATCH 1/2] st/mesa: don't move ssbo after atomic buffers if we support hw atomics

[Ilia Mirkin]

Reviewed-by: Ilia Mirkin <imirkin at alum.mit.edu>

On Thu, Nov 16, 2017 at 9:05 PM, Dave Airlie <airlied at gmail.com> wrote:
> From: Dave Airlie <airlied at redhat.com>
>
> There is no need to have these overlap if we support hw atomics.
>
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> ---
>  src/mesa/state_tracker/st_atom_storagebuf.c |  8 +++++---
>  src/mesa/state_tracker/st_glsl_to_tgsi.cpp  | 14 ++++++++------
>  2 files changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/src/mesa/state_tracker/st_atom_storagebuf.c b/src/mesa/state_tracker/st_atom_storagebuf.c
> index a31a8fd..2c55af3 100644
> --- a/src/mesa/state_tracker/st_atom_storagebuf.c
> +++ b/src/mesa/state_tracker/st_atom_storagebuf.c
> @@ -47,12 +47,14 @@ st_bind_ssbos(struct st_context *st, struct gl_program *prog,
>     unsigned i;
>     struct pipe_shader_buffer buffers[MAX_SHADER_STORAGE_BUFFERS];
>     struct gl_program_constants *c;
> -
> +   int buffer_base;
>     if (!prog || !st->pipe->set_shader_buffers)
>        return;
>
>     c = &st->ctx->Const.Program[prog->info.stage];
>
> +   buffer_base = st->has_hw_atomics ? 0 : c->MaxAtomicBuffers;
> +
>     for (i = 0; i < prog->info.num_ssbos; i++) {
>        struct gl_buffer_binding *binding;
>        struct st_buffer_object *st_obj;
> @@ -79,13 +81,13 @@ st_bind_ssbos(struct st_context *st, struct gl_program *prog,
>           sb->buffer_size = 0;
>        }
>     }
> -   st->pipe->set_shader_buffers(st->pipe, shader_type, c->MaxAtomicBuffers,
> +   st->pipe->set_shader_buffers(st->pipe, shader_type, buffer_base,
>                                  prog->info.num_ssbos, buffers);
>     /* clear out any stale shader buffers */
>     if (prog->info.num_ssbos < c->MaxShaderStorageBlocks)
>        st->pipe->set_shader_buffers(
>              st->pipe, shader_type,
> -            c->MaxAtomicBuffers + prog->info.num_ssbos,
> +            buffer_base + prog->info.num_ssbos,
>              c->MaxShaderStorageBlocks - prog->info.num_ssbos,
>              NULL);
>  }
> diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> index 93b5cc7..a863eb2 100644
> --- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> +++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> @@ -2128,10 +2128,10 @@ glsl_to_tgsi_visitor::visit_expression(ir_expression* ir, st_src_reg *op)
>
>     case ir_unop_get_buffer_size: {
>        ir_constant *const_offset = ir->operands[0]->as_constant();
> +      int buf_base = ctx->st->has_hw_atomics ? 0 : ctx->Const.Program[shader->Stage].MaxAtomicBuffers;
>        st_src_reg buffer(
>              PROGRAM_BUFFER,
> -            ctx->Const.Program[shader->Stage].MaxAtomicBuffers +
> -            (const_offset ? const_offset->value.u[0] : 0),
> +            buf_base + (const_offset ? const_offset->value.u[0] : 0),
>              GLSL_TYPE_UINT);
>        if (!const_offset) {
>           buffer.reladdr = ralloc(mem_ctx, st_src_reg);
> @@ -3352,11 +3352,10 @@ glsl_to_tgsi_visitor::visit_ssbo_intrinsic(ir_call *ir)
>     ir_rvalue *offset = ((ir_instruction *)param)->as_rvalue();
>
>     ir_constant *const_block = block->as_constant();
> -
> +   int buf_base = st_context(ctx)->has_hw_atomics ? 0 : ctx->Const.Program[shader->Stage].MaxAtomicBuffers;
>     st_src_reg buffer(
>           PROGRAM_BUFFER,
> -         ctx->Const.Program[shader->Stage].MaxAtomicBuffers +
> -         (const_block ? const_block->value.u[0] : 0),
> +         buf_base + (const_block ? const_block->value.u[0] : 0),
>           GLSL_TYPE_UINT);
>
>     if (!const_block) {
> @@ -6581,7 +6580,10 @@ st_translate_program(
>
>        assert(prog->info.num_ssbos <= frag_const->MaxShaderStorageBlocks);
>        for (i = 0; i < prog->info.num_ssbos; i++) {
> -         unsigned index = frag_const->MaxAtomicBuffers + i;
> +         unsigned index = i;
> +         if (!st_context(ctx)->has_hw_atomics)
> +            index += frag_const->MaxAtomicBuffers;
> +
>           t->buffers[index] = ureg_DECL_buffer(ureg, index, false);
>        }
>     }
> --
> 2.9.5
>
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