i965: Move env_var_as_boolean to intel_debug.c.

I need to use this in brw_vec4.cpp, so it can't be static anymore.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>

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

@@ -3850,26 +3850,6 @@ fs_visitor::allocate_registers()
       prog_data->total_scratch = brw_get_scratch_size(last_scratch);
 }
 
-static bool
-env_var_as_boolean(const char *var_name, bool default_value)
-{
-   const char *str = getenv(var_name);
-   if (str == NULL)
-      return default_value;
-
-   if (strcmp(str, "1") == 0 ||
-       strcasecmp(str, "true") == 0 ||
-       strcasecmp(str, "yes") == 0) {
-      return true;
-   } else if (strcmp(str, "0") == 0 ||
-              strcasecmp(str, "false") == 0 ||
-              strcasecmp(str, "no") == 0) {
-      return false;
-   } else {
-      return default_value;
-   }
-}
-
 bool
 fs_visitor::run_vs()
 {
@@ -3881,7 +3861,7 @@ fs_visitor::run_vs()
    if (INTEL_DEBUG & DEBUG_SHADER_TIME)
       emit_shader_time_begin();
 
-   if (env_var_as_boolean("INTEL_USE_NIR", false)) {
+   if (brw_env_var_as_boolean("INTEL_USE_NIR", false)) {
       emit_nir_code();
    } else {
       foreach_in_list(ir_instruction, ir, shader->base.ir) {
@@ -3954,7 +3934,7 @@ fs_visitor::run_fs()
       /* Generate FS IR for main().  (the visitor only descends into
        * functions called "main").
        */
-      if (env_var_as_boolean("INTEL_USE_NIR", false)) {
+      if (brw_env_var_as_boolean("INTEL_USE_NIR", false)) {
          emit_nir_code();
       } else if (shader) {
          foreach_in_list(ir_instruction, ir, shader->base.ir) {

src/mesa/drivers/dri/i965/intel_debug.c

@@ -106,3 +106,28 @@ brw_process_intel_debug_variable(struct brw_context *brw)
    if (INTEL_DEBUG & DEBUG_AUB)
       drm_intel_bufmgr_gem_set_aub_dump(brw->bufmgr, true);
 }
+
+/**
+ * Reads an environment variable and interprets its value as a boolean.
+ *
+ * Recognizes 0/false/no and 1/true/yes.  Other values result in the default value.
+ */
+bool
+brw_env_var_as_boolean(const char *var_name, bool default_value)
+{
+   const char *str = getenv(var_name);
+   if (str == NULL)
+      return default_value;
+
+   if (strcmp(str, "1") == 0 ||
+       strcasecmp(str, "true") == 0 ||
+       strcasecmp(str, "yes") == 0) {
+      return true;
+   } else if (strcmp(str, "0") == 0 ||
+              strcasecmp(str, "false") == 0 ||
+              strcasecmp(str, "no") == 0) {
+      return false;
+   } else {
+      return default_value;
+   }
+}

src/mesa/drivers/dri/i965/intel_debug.h

@@ -115,3 +115,5 @@ extern uint64_t intel_debug_flag_for_shader_stage(gl_shader_stage stage);
 struct brw_context;
 
 extern void brw_process_intel_debug_variable(struct brw_context *brw);
+
+extern bool brw_env_var_as_boolean(const char *var_name, bool default_value);