mesa: Pull ir_to_mesa's sampler number fetcher out to shared code.
diff --git a/src/mesa/program/sampler.cpp b/src/mesa/program/sampler.cpp
new file mode 100644
index 0000000..0e58aef
--- /dev/null
+++ b/src/mesa/program/sampler.cpp
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2005-2007 Brian Paul All Rights Reserved.
+ * Copyright (C) 2008 VMware, Inc. All Rights Reserved.
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+
+extern "C" {
+#include "main/compiler.h"
+#include "main/mtypes.h"
+#include "program/prog_parameter.h"
+#include "ir.h"
+#include "ir_visitor.h"
+#include "glsl_types.h"
+}
+
+static void fail_link(struct gl_shader_program *prog, const char *fmt, ...) PRINTFLIKE(2, 3);
+
+static void fail_link(struct gl_shader_program *prog, const char *fmt, ...)
+{
+ va_list args;
+ va_start(args, fmt);
+ prog->InfoLog = talloc_vasprintf_append(prog->InfoLog, fmt, args);
+ va_end(args);
+
+ prog->LinkStatus = GL_FALSE;
+}
+
+class get_sampler_name : public ir_hierarchical_visitor
+{
+public:
+ get_sampler_name(ir_dereference *last,
+ struct gl_shader_program *shader_program)
+ {
+ this->mem_ctx = talloc_new(NULL);
+ this->shader_program = shader_program;
+ this->name = NULL;
+ this->offset = 0;
+ this->last = last;
+ }
+
+ ~get_sampler_name()
+ {
+ talloc_free(this->mem_ctx);
+ }
+
+ virtual ir_visitor_status visit(ir_dereference_variable *ir)
+ {
+ this->name = ir->var->name;
+ return visit_continue;
+ }
+
+ virtual ir_visitor_status visit_leave(ir_dereference_record *ir)
+ {
+ this->name = talloc_asprintf(mem_ctx, "%s.%s", name, ir->field);
+ return visit_continue;
+ }
+
+ virtual ir_visitor_status visit_leave(ir_dereference_array *ir)
+ {
+ ir_constant *index = ir->array_index->as_constant();
+ int i;
+
+ if (index) {
+ i = index->value.i[0];
+ } else {
+ /* GLSL 1.10 and 1.20 allowed variable sampler array indices,
+ * while GLSL 1.30 requires that the array indices be
+ * constant integer expressions. We don't expect any driver
+ * to actually work with a really variable array index, so
+ * all that would work would be an unrolled loop counter that ends
+ * up being constant above.
+ */
+ shader_program->InfoLog =
+ talloc_asprintf_append(shader_program->InfoLog,
+ "warning: Variable sampler array index "
+ "unsupported.\nThis feature of the language "
+ "was removed in GLSL 1.20 and is unlikely "
+ "to be supported for 1.10 in Mesa.\n");
+ i = 0;
+ }
+ if (ir != last) {
+ this->name = talloc_asprintf(mem_ctx, "%s[%d]", name, i);
+ } else {
+ offset = i;
+ }
+ return visit_continue;
+ }
+
+ struct gl_shader_program *shader_program;
+ const char *name;
+ void *mem_ctx;
+ int offset;
+ ir_dereference *last;
+};
+
+extern "C" {
+int
+_mesa_get_sampler_uniform_value(class ir_dereference *sampler,
+ struct gl_shader_program *shader_program,
+ const struct gl_program *prog)
+{
+ get_sampler_name getname(sampler, shader_program);
+
+ sampler->accept(&getname);
+
+ GLint index = _mesa_lookup_parameter_index(prog->Parameters, -1,
+ getname.name);
+
+ if (index < 0) {
+ fail_link(shader_program,
+ "failed to find sampler named %s.\n", getname.name);
+ return 0;
+ }
+
+ index += getname.offset;
+
+ return prog->Parameters->ParameterValues[index][0];
+}
+}