nir: Drop the ssbo_offset to atomic lowering.

The arguments passed in were:
- prog->info.num_ssbos
- prog->nir->info.num_ssbos
- arbitrary values for standalone compilers

The num_ssbos should match between the prog's info and prog->nir's info
until this lowering happens.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3240>

src/compiler/nir/nir.h

@@ -4100,7 +4100,7 @@ typedef struct nir_lower_bitmap_options {
 
 void nir_lower_bitmap(nir_shader *shader, const nir_lower_bitmap_options *options);
 
-bool nir_lower_atomics_to_ssbo(nir_shader *shader, unsigned ssbo_offset);
+bool nir_lower_atomics_to_ssbo(nir_shader *shader);
 
 typedef enum  {
    nir_lower_int_source_mods = 1 << 0,

src/compiler/nir/nir_lower_atomics_to_ssbo.c

@@ -32,7 +32,8 @@
 #endif
 
 /*
- * Remap atomic counters to SSBOs, starting from the passed in ssbo_offset.
+ * Remap atomic counters to SSBOs, starting from the shader's next SSBO slot
+ * (info.num_ssbos).
  */
 
 static bool
@@ -161,8 +162,9 @@ is_atomic_uint(const struct glsl_type *type)
 }
 
 bool
-nir_lower_atomics_to_ssbo(nir_shader *shader, unsigned ssbo_offset)
+nir_lower_atomics_to_ssbo(nir_shader *shader)
 {
+   unsigned ssbo_offset = shader->info.num_ssbos;
    bool progress = false;
 
    nir_foreach_function(function, shader) {

src/gallium/drivers/freedreno/ir3/ir3_cmdline.c

@@ -142,7 +142,7 @@ load_glsl(unsigned num_files, char* const* files, gl_shader_stage stage)
 	NIR_PASS_V(nir, nir_lower_var_copies);
 	nir_print_shader(nir, stdout);
 	NIR_PASS_V(nir, gl_nir_lower_atomics, prog, true);
-	NIR_PASS_V(nir, nir_lower_atomics_to_ssbo, 8);
+	NIR_PASS_V(nir, nir_lower_atomics_to_ssbo);
 	nir_print_shader(nir, stdout);
 
 	switch (stage) {

src/gallium/drivers/lima/standalone/lima_compiler_cmdline.c

@@ -135,7 +135,7 @@ load_glsl(unsigned num_files, char* const* files, gl_shader_stage stage)
    NIR_PASS_V(nir, nir_lower_var_copies);
    nir_print_shader(nir, stdout);
    NIR_PASS_V(nir, gl_nir_lower_atomics, prog, true);
-   NIR_PASS_V(nir, nir_lower_atomics_to_ssbo, 8);
+   NIR_PASS_V(nir, nir_lower_atomics_to_ssbo);
    nir_print_shader(nir, stdout);
 
    switch (stage) {

src/mesa/drivers/dri/i965/brw_link.cpp

@@ -332,8 +332,7 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
       brw_shader_gather_info(prog->nir, prog);
 
       NIR_PASS_V(prog->nir, gl_nir_lower_atomics, shProg, false);
-      NIR_PASS_V(prog->nir, nir_lower_atomics_to_ssbo,
-                 prog->nir->info.num_ssbos);
+      NIR_PASS_V(prog->nir, nir_lower_atomics_to_ssbo);
 
       nir_sweep(prog->nir);
 

src/mesa/state_tracker/st_glsl_to_nir.cpp

@@ -504,7 +504,7 @@ st_glsl_to_nir_post_opts(struct st_context *st, struct gl_program *prog,
    nir_remove_dead_variables(nir, mask);
 
    if (!st->has_hw_atomics)
-      NIR_PASS_V(nir, nir_lower_atomics_to_ssbo, prog->info.num_ssbos);
+      NIR_PASS_V(nir, nir_lower_atomics_to_ssbo);
 
    st_finalize_nir_before_variants(nir);