mesa: set the gl_FragDepth layout in the GLSL linker
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 0ec773d..3527088 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -1876,6 +1876,57 @@
}
/**
+ * Store the gl_FragDepth layout in the gl_shader_program struct.
+ */
+static void
+store_fragdepth_layout(struct gl_shader_program *prog)
+{
+ if (prog->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL) {
+ return;
+ }
+
+ struct exec_list *ir = prog->_LinkedShaders[MESA_SHADER_FRAGMENT]->ir;
+
+ /* We don't look up the gl_FragDepth symbol directly because if
+ * gl_FragDepth is not used in the shader, it's removed from the IR.
+ * However, the symbol won't be removed from the symbol table.
+ *
+ * We're only interested in the cases where the variable is NOT removed
+ * from the IR.
+ */
+ foreach_list(node, ir) {
+ ir_variable *const var = ((ir_instruction *) node)->as_variable();
+
+ if (var == NULL || var->mode != ir_var_out) {
+ continue;
+ }
+
+ if (strcmp(var->name, "gl_FragDepth") == 0) {
+ switch (var->depth_layout) {
+ case ir_depth_layout_none:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_NONE;
+ return;
+ case ir_depth_layout_any:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_ANY;
+ return;
+ case ir_depth_layout_greater:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_GREATER;
+ return;
+ case ir_depth_layout_less:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_LESS;
+ return;
+ case ir_depth_layout_unchanged:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_UNCHANGED;
+ return;
+ default:
+ assert(0);
+ return;
+ }
+ }
+ }
+}
+
+/**
* Validate the resources used by a program versus the implementation limits
*/
static bool
@@ -2177,6 +2228,7 @@
update_array_sizes(prog);
link_assign_uniform_locations(prog);
+ store_fragdepth_layout(prog);
if (!check_resources(ctx, prog))
goto done;