st: add uniform packing support to lower_uniforms_to_ubo()

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/mesa/state_tracker/st_glsl_to_nir.cpp

@@ -762,7 +762,7 @@ st_finalize_nir(struct st_context *st, struct gl_program *prog,
                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
       NIR_PASS_V(nir, nir_lower_io, nir_var_uniform, type_size,
                  (nir_lower_io_options)0);
-      NIR_PASS_V(nir, st_nir_lower_uniforms_to_ubo);
+      NIR_PASS_V(nir, st_nir_lower_uniforms_to_ubo, prog->Parameters);
    }
 
    if (screen->get_param(screen, PIPE_CAP_NIR_SAMPLERS_AS_DEREF))

src/mesa/state_tracker/st_nir.h

@@ -36,7 +36,8 @@ struct nir_shader;
 void st_nir_lower_builtin(struct nir_shader *shader);
 void st_nir_lower_tex_src_plane(struct nir_shader *shader, unsigned free_slots,
                                 unsigned lower_2plane, unsigned lower_3plane);
-bool st_nir_lower_uniforms_to_ubo(struct nir_shader *shader);
+bool st_nir_lower_uniforms_to_ubo(struct nir_shader *shader,
+                                  const struct gl_program_parameter_list *params);
 
 void st_finalize_nir(struct st_context *st, struct gl_program *prog,
                      struct gl_shader_program *shader_program,

src/mesa/state_tracker/st_nir_lower_uniforms_to_ubo.c

@@ -33,8 +33,11 @@
 #include "nir_builder.h"
 #include "st_nir.h"
 
+#include "program/prog_parameter.h"
+
 static bool
-lower_instr(nir_intrinsic_instr *instr, nir_builder *b)
+lower_instr(nir_intrinsic_instr *instr, nir_builder *b,
+            const struct gl_program_parameter_list *params)
 {
    b->cursor = nir_before_instr(&instr->instr);
 
@@ -47,10 +50,12 @@ lower_instr(nir_intrinsic_instr *instr, nir_builder *b)
    }
 
    if (instr->intrinsic == nir_intrinsic_load_uniform) {
+      unsigned pvo = params->ParameterValueOffset[nir_intrinsic_base(instr)];
+
       nir_ssa_def *ubo_idx = nir_imm_int(b, 0);
       nir_ssa_def *ubo_offset =
-         nir_imul(b, nir_imm_int(b, 16),
-                  nir_iadd(b, nir_imm_int(b, nir_intrinsic_base(instr)),
+         nir_iadd(b, nir_imm_int(b, 4 * pvo),
+                  nir_imul(b, nir_imm_int(b, 4),
                            nir_ssa_for_src(b, instr->src[0], 1)));
 
       nir_intrinsic_instr *load =
@@ -72,7 +77,8 @@ lower_instr(nir_intrinsic_instr *instr, nir_builder *b)
 }
 
 bool
-st_nir_lower_uniforms_to_ubo(nir_shader *shader)
+st_nir_lower_uniforms_to_ubo(nir_shader *shader,
+                             const struct gl_program_parameter_list *params)
 {
    bool progress = false;
 
@@ -84,7 +90,7 @@ st_nir_lower_uniforms_to_ubo(nir_shader *shader)
             nir_foreach_instr_safe(instr, block) {
                if (instr->type == nir_instr_type_intrinsic)
                   progress |= lower_instr(nir_instr_as_intrinsic(instr),
-                                          &builder);
+                                          &builder, params);
             }
          }