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authormarha <marha@users.sourceforge.net>2013-02-05 08:28:03 +0100
committermarha <marha@users.sourceforge.net>2013-02-05 08:28:03 +0100
commitf6023b333a7fec1691bfb2757ba7615a15196a81 (patch)
tree17e7b1b021478ef2c470bf8202f144be04c4fea8 /mesalib/src/glsl/linker.cpp
parente4326f248054c0276b6e9136cd48e782e42c2644 (diff)
parent76c527be60066b647468ad66f8e4d7dd18fa1769 (diff)
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Merge remote-tracking branch 'origin/released'
* origin/released: fontconfig mesa xkeyboard-config git update 5 feb 2013
Diffstat (limited to 'mesalib/src/glsl/linker.cpp')
-rw-r--r--mesalib/src/glsl/linker.cpp59
1 files changed, 59 insertions, 0 deletions
diff --git a/mesalib/src/glsl/linker.cpp b/mesalib/src/glsl/linker.cpp
index 63ce178f4..57e7a9ad3 100644
--- a/mesalib/src/glsl/linker.cpp
+++ b/mesalib/src/glsl/linker.cpp
@@ -200,6 +200,65 @@ linker_warning(gl_shader_program *prog, const char *fmt, ...)
}
+/**
+ * Given a string identifying a program resource, break it into a base name
+ * and an optional array index in square brackets.
+ *
+ * If an array index is present, \c out_base_name_end is set to point to the
+ * "[" that precedes the array index, and the array index itself is returned
+ * as a long.
+ *
+ * If no array index is present (or if the array index is negative or
+ * mal-formed), \c out_base_name_end, is set to point to the null terminator
+ * at the end of the input string, and -1 is returned.
+ *
+ * Only the final array index is parsed; if the string contains other array
+ * indices (or structure field accesses), they are left in the base name.
+ *
+ * No attempt is made to check that the base name is properly formed;
+ * typically the caller will look up the base name in a hash table, so
+ * ill-formed base names simply turn into hash table lookup failures.
+ */
+long
+parse_program_resource_name(const GLchar *name,
+ const GLchar **out_base_name_end)
+{
+ /* Section 7.3.1 ("Program Interfaces") of the OpenGL 4.3 spec says:
+ *
+ * "When an integer array element or block instance number is part of
+ * the name string, it will be specified in decimal form without a "+"
+ * or "-" sign or any extra leading zeroes. Additionally, the name
+ * string will not include white space anywhere in the string."
+ */
+
+ const size_t len = strlen(name);
+ *out_base_name_end = name + len;
+
+ if (len == 0 || name[len-1] != ']')
+ return -1;
+
+ /* Walk backwards over the string looking for a non-digit character. This
+ * had better be the opening bracket for an array index.
+ *
+ * Initially, i specifies the location of the ']'. Since the string may
+ * contain only the ']' charcater, walk backwards very carefully.
+ */
+ unsigned i;
+ for (i = len - 1; (i > 0) && isdigit(name[i-1]); --i)
+ /* empty */ ;
+
+ if ((i == 0) || name[i-1] != '[')
+ return -1;
+
+ long array_index = strtol(&name[i], NULL, 10);
+ if (array_index < 0)
+ return -1;
+
+ *out_base_name_end = name + (i - 1);
+ return array_index;
+}
+
+
void
link_invalidate_variable_locations(gl_shader *sh, int input_base,
int output_base)