glsl: Add new structures for tracking uniforms in linked shaders

v2: Update some comments based on feedback from Eric Anholt.

v3: Remove gl_uniform_storage::dirty field.  Make
gl_uniform_storage::initialized be bool, and make
gl_uniform_storage::sampler be uint8_t.

v4: Include stdbool.h after Tom Stellard noticed a build failure that
was introduced by the changes in v2.  Oops.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Tested-by: Tom Stellard <thomas.stellard@amd.com>

diff --git a/src/glsl/ir_uniform.h b/src/glsl/ir_uniform.h
new file mode 100644 (file)
index 0000000..f53388c
--- /dev/null
+++ b/src/glsl/ir_uniform.h
@@ -0,0 +1,125 @@
+/*
+ * Copyright © 2011 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.
+ */
+
+#pragma once
+#ifndef IR_UNIFORM_H
+#define IR_UNIFORM_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* stdbool.h is necessary because this file is included in both C and C++ code.
+ */
+#include <stdbool.h>
+#include "program/prog_parameter.h"  /* For union gl_constant_value. */
+
+enum gl_uniform_driver_format {
+   uniform_native = 0,          /**< Store data in the native format. */
+   uniform_int_float,           /**< Store integer data as floats. */
+   uniform_bool_float,          /**< Store boolean data as floats. */
+
+   /**
+    * Store boolean data as integer using 1 for \c true.
+    */
+   uniform_bool_int_0_1,
+
+   /**
+    * Store boolean data as integer using ~0 for \c true.
+    */
+   uniform_bool_int_0_not0,
+};
+
+struct gl_uniform_driver_storage {
+   /**
+    * Number of bytes from one array element to the next.
+    */
+   uint8_t element_stride;
+
+   /**
+    * Number of bytes from one vector in a matrix to the next.
+    */
+   uint8_t vector_stride;
+
+   /**
+    * Base format of the stored data.
+    *
+    * This field must have a value from \c GLSL_TYPE_UINT through \c
+    * GLSL_TYPE_SAMPLER.
+    */
+   uint8_t format;
+
+   /**
+    * Pointer to the base of the data.
+    */
+   void *data;
+};
+
+struct gl_uniform_storage {
+   char *name;
+   const struct glsl_type *type;
+
+   /**
+    * The number of elements in this uniform.
+    *
+    * For non-arrays, this is always 0.  For arrays, the value is the size of
+    * the array.
+    */
+   unsigned array_elements;
+
+   /**
+    * Has this uniform ever been set?
+    */
+   bool initialized;
+
+   /**
+    * Base sampler index
+    *
+    * If \c ::base_type is \c GLSL_TYPE_SAMPLER, this represents the index of
+    * this sampler.  If \c ::array_elements is not zero, the array will use
+    * sampler indexes \c ::sampler through \c ::sampler + \c ::array_elements
+    * - 1, inclusive.
+    */
+   uint8_t sampler;
+
+   /**
+    * Storage used by the driver for the uniform
+    */
+   unsigned num_driver_storage;
+   struct gl_uniform_driver_storage *driver_storage;
+
+   /**
+    * Storage used by Mesa for the uniform
+    *
+    * This form of the uniform is used by Mesa's implementation of \c
+    * glGetUniform.  It can also be used by drivers to obtain the value of the
+    * uniform if the \c ::driver_storage interface is not used.
+    */
+   union gl_constant_value *storage;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* IR_UNIFORM_H */