diff --git a/src/vrend_renderer.c b/src/vrend_renderer.c
index 61d17a9..1ba7f74 100644
--- a/src/vrend_renderer.c
+++ b/src/vrend_renderer.c
@@ -61,7 +61,6 @@ static void vrend_update_frontface_state(struct vrend_context *ctx);
 static void vrender_get_glsl_version(int *glsl_version);
 static void vrend_destroy_resource_object(void *obj_ptr);
 static void vrend_renderer_detach_res_ctx_p(struct vrend_context *ctx, int res_handle);
-extern int vrend_shader_use_explicit;
 
 int vrend_dump_shaders;
 
@@ -111,6 +110,8 @@ struct global_renderer_state {
    bool have_bit_encoding;
    bool have_vertex_attrib_binding;
 
+   /* these appeared broken on at least one driver */
+   bool use_explicit_locations;
    uint32_t max_uniform_blocks;
    struct list_head active_ctx_list;
 };
@@ -2292,7 +2293,7 @@ static void vrend_draw_bind_vertex_legacy(struct vrend_context *ctx,
            continue;
       }
 
-      if (vrend_shader_use_explicit || vrend_state.have_vertex_attrib_binding) {
+      if (vrend_state.use_explicit_locations || vrend_state.have_vertex_attrib_binding) {
          loc = i;
       } else {
 	if (ctx->sub->prog->attrib_locs) {
@@ -3570,7 +3571,7 @@ struct vrend_context *vrend_create_context(int id, uint32_t nlen, const char *de
    grctx->res_hash = vrend_object_init_ctx_table();
 
    grctx->shader_cfg.use_core_profile = vrend_state.use_core_profile;
-
+   grctx->shader_cfg.use_explicit_locations = vrend_state.use_explicit_locations;
    vrend_renderer_create_sub_ctx(grctx, 0);
    vrend_renderer_set_sub_ctx(grctx, 0);
 
diff --git a/src/vrend_shader.c b/src/vrend_shader.c
index 1135390..bd79936 100644
--- a/src/vrend_shader.c
+++ b/src/vrend_shader.c
@@ -42,8 +42,6 @@ extern int vrend_dump_shaders;
 
 #define INTERP_PREFIX "               "
 
-int vrend_shader_use_explicit = 0;
-
 struct vrend_shader_io {
    unsigned		name;
    unsigned		gpr;
@@ -1857,7 +1855,7 @@ static char *emit_header(struct dump_ctx *ctx, char *glsl_hdr)
       STRCAT_WITH_RET(glsl_hdr, "#version 140\n");
    else
       STRCAT_WITH_RET(glsl_hdr, "#version 130\n");
-   if (ctx->prog_type == TGSI_PROCESSOR_VERTEX && vrend_shader_use_explicit)
+   if (ctx->prog_type == TGSI_PROCESSOR_VERTEX && ctx->cfg->use_explicit_locations)
       STRCAT_WITH_RET(glsl_hdr, "#extension GL_ARB_explicit_attrib_location : enable\n");
    if (ctx->prog_type == TGSI_PROCESSOR_FRAGMENT && fs_emit_layout(ctx))
       STRCAT_WITH_RET(glsl_hdr, "#extension GL_ARB_fragment_coord_conventions : enable\n");
@@ -1954,7 +1952,7 @@ static char *emit_ios(struct dump_ctx *ctx, char *glsl_hdr)
    }
    for (i = 0; i < ctx->num_inputs; i++) {
       if (!ctx->inputs[i].glsl_predefined_no_emit) { 
-         if (ctx->prog_type == TGSI_PROCESSOR_VERTEX && vrend_shader_use_explicit) {
+         if (ctx->prog_type == TGSI_PROCESSOR_VERTEX && ctx->cfg->use_explicit_locations) {
             snprintf(buf, 255, "layout(location=%d) ", ctx->inputs[i].first);
             STRCAT_WITH_RET(glsl_hdr, buf);
          }
diff --git a/src/vrend_shader.h b/src/vrend_shader.h
index 5e27c5f..d21b5f1 100644
--- a/src/vrend_shader.h
+++ b/src/vrend_shader.h
@@ -67,6 +67,7 @@ struct vrend_shader_key {
 struct vrend_shader_cfg {
    int glsl_version;
    bool use_core_profile;
+   bool use_explicit_locations;
 };
 
 bool vrend_patch_vertex_shader_interpolants(char *program,