1 files changed, 140 insertions, 0 deletions
diff --git a/src/mesa/program/sampler.cpp b/src/mesa/program/sampler.cpp
new file mode 100644
index 00000000000..0e58aef9c95
--- /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];
+}
+}