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authormarha <marha@users.sourceforge.net>2014-05-11 17:43:25 +0200
committermarha <marha@users.sourceforge.net>2014-05-11 17:43:25 +0200
commit26dfcdba6c306d6312c598e4191449302329be68 (patch)
tree2bf56b5a0eb2cc554833fdc6e08f2b59f1bfdabd /mesalib/src/mesa/main/shader_query.cpp
parent2dc2880eacae3d52f4ab4bb5ec43c5bbf50c5c3f (diff)
parentae06feae7876db47ff0e1fde40cf4a324a412037 (diff)
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Merge remote-tracking branch 'origin/released'
Conflicts: mesalib/src/mesa/main/imports.h
Diffstat (limited to 'mesalib/src/mesa/main/shader_query.cpp')
-rw-r--r--mesalib/src/mesa/main/shader_query.cpp71
1 files changed, 66 insertions, 5 deletions
diff --git a/mesalib/src/mesa/main/shader_query.cpp b/mesalib/src/mesa/main/shader_query.cpp
index f66c11733..36d1d9cc0 100644
--- a/mesalib/src/mesa/main/shader_query.cpp
+++ b/mesalib/src/mesa/main/shader_query.cpp
@@ -153,6 +153,63 @@ _mesa_GetActiveAttrib(GLhandleARB program, GLuint desired_index,
_mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveAttrib(index)");
}
+/* Locations associated with shader variables (array or non-array) can be
+ * queried using its base name or using the base name appended with the
+ * valid array index. For example, in case of below vertex shader, valid
+ * queries can be made to know the location of "xyz", "array", "array[0]",
+ * "array[1]", "array[2]" and "array[3]". In this example index reurned
+ * will be 0, 0, 0, 1, 2, 3 respectively.
+ *
+ * [Vertex Shader]
+ * layout(location=0) in vec4 xyz;
+ * layout(location=1) in vec4[4] array;
+ * void main()
+ * { }
+ *
+ * This requirement came up with the addition of ARB_program_interface_query
+ * to OpenGL 4.3 specification. See page 101 (page 122 of the PDF) for details.
+ *
+ * This utility function is used by:
+ * _mesa_GetAttribLocation
+ * _mesa_GetFragDataLocation
+ * _mesa_GetFragDataIndex
+ *
+ * Returns 0:
+ * if the 'name' string matches var->name.
+ * Returns 'matched index':
+ * if the 'name' string matches var->name appended with valid array index.
+ */
+int static inline
+get_matching_index(const ir_variable *const var, const char *name) {
+ unsigned idx = 0;
+ const char *const paren = strchr(name, '[');
+ const unsigned len = (paren != NULL) ? paren - name : strlen(name);
+
+ if (paren != NULL) {
+ if (!var->type->is_array())
+ return -1;
+
+ char *endptr;
+ idx = (unsigned) strtol(paren + 1, &endptr, 10);
+ const unsigned idx_len = endptr != (paren + 1) ? endptr - paren - 1 : 0;
+
+ /* Validate the sub string representing index in 'name' string */
+ if ((idx > 0 && paren[1] == '0') /* leading zeroes */
+ || (idx == 0 && idx_len > 1) /* all zeroes */
+ || paren[1] == ' ' /* whitespace */
+ || endptr[0] != ']' /* closing brace */
+ || endptr[1] != '\0' /* null char */
+ || idx_len == 0 /* missing index */
+ || idx >= var->type->length) /* exceeding array bound */
+ return -1;
+ }
+
+ if (strncmp(var->name, name, len) == 0 && var->name[len] == '\0')
+ return idx;
+
+ return -1;
+}
+
GLint GLAPIENTRY
_mesa_GetAttribLocation(GLhandleARB program, const GLcharARB * name)
{
@@ -196,8 +253,10 @@ _mesa_GetAttribLocation(GLhandleARB program, const GLcharARB * name)
|| var->data.location < VERT_ATTRIB_GENERIC0)
continue;
- if (strcmp(var->name, name) == 0)
- return var->data.location - VERT_ATTRIB_GENERIC0;
+ int index = get_matching_index(var, (const char *) name);
+
+ if (index >= 0)
+ return var->data.location + index - VERT_ATTRIB_GENERIC0;
}
return -1;
@@ -358,7 +417,7 @@ _mesa_GetFragDataIndex(GLuint program, const GLchar *name)
|| var->data.location < FRAG_RESULT_DATA0)
continue;
- if (strcmp(var->name, name) == 0)
+ if (get_matching_index(var, (const char *) name) >= 0)
return var->data.index;
}
@@ -414,8 +473,10 @@ _mesa_GetFragDataLocation(GLuint program, const GLchar *name)
|| var->data.location < FRAG_RESULT_DATA0)
continue;
- if (strcmp(var->name, name) == 0)
- return var->data.location - FRAG_RESULT_DATA0;
+ int index = get_matching_index(var, (const char *) name);
+
+ if (index >= 0)
+ return var->data.location + index - FRAG_RESULT_DATA0;
}
return -1;