egl: Introduce config keys.

Config keys are almost config attributes.  A valid config attribute is a
valid config key, but a valid config key may not be a valid config
attribute.

This commit does not distinguish the differences.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>

1 files changed, 74 insertions, 12 deletions

diff --git a/src/egl/main/eglconfig.h b/src/egl/main/eglconfig.h
index 36ed96ae95..b07632a92e 100644
--- a/src/egl/main/eglconfig.h
+++ b/src/egl/main/eglconfig.h
@@ -2,27 +2,93 @@
 #define EGLCONFIG_INCLUDED
 
 
+#include <assert.h>
 #include "egltypedefs.h"
-#include <GLES/gl.h>
 
 
-#define MAX_ATTRIBS 128
-#define FIRST_ATTRIB EGL_BUFFER_SIZE
+#define _EGL_CONFIG_FIRST_ATTRIB EGL_BUFFER_SIZE
+#define _EGL_CONFIG_LAST_ATTRIB EGL_CONFORMANT
+#define _EGL_CONFIG_NUM_ATTRIBS \
+   (_EGL_CONFIG_LAST_ATTRIB - _EGL_CONFIG_FIRST_ATTRIB + 1)
+
+#define _EGL_CONFIG_STORAGE_SIZE _EGL_CONFIG_NUM_ATTRIBS
 
 
 struct _egl_config
 {
    EGLConfig Handle;   /* the public/opaque handle which names this config */
-   EGLint Attrib[MAX_ATTRIBS];
+   EGLint Storage[_EGL_CONFIG_STORAGE_SIZE];
 };
 
 
-#define SET_CONFIG_ATTRIB(CONF, ATTR, VAL) \
-   assert((ATTR) - FIRST_ATTRIB < MAX_ATTRIBS); \
-   ((CONF)->Attrib[(ATTR) - FIRST_ATTRIB] = VAL)
+#define SET_CONFIG_ATTRIB(CONF, ATTR, VAL) _eglSetConfigKey(CONF, ATTR, VAL)
+#define GET_CONFIG_ATTRIB(CONF, ATTR) _eglGetConfigKey(CONF, ATTR)
 
 
-#define GET_CONFIG_ATTRIB(CONF, ATTR) ((CONF)->Attrib[(ATTR) - FIRST_ATTRIB])
+/**
+ * Given a key, return an index into the storage of the config.
+ * Return -1 if the key is invalid.
+ */
+static INLINE EGLint
+_eglIndexConfig(const _EGLConfig *conf, EGLint key)
+{
+   (void) conf;
+   if (key >= _EGL_CONFIG_FIRST_ATTRIB &&
+       key < _EGL_CONFIG_FIRST_ATTRIB + _EGL_CONFIG_NUM_ATTRIBS)
+      return key - _EGL_CONFIG_FIRST_ATTRIB;
+   else
+      return -1;
+}
+
+
+/**
+ * Reset all keys in the config to a given value.
+ */
+static INLINE void
+_eglResetConfigKeys(_EGLConfig *conf, EGLint val)
+{
+   EGLint i;
+   for (i = 0; i < _EGL_CONFIG_NUM_ATTRIBS; i++)
+      conf->Storage[i] = val;
+}
+
+
+/**
+ * Update a config for a given key.
+ */
+static INLINE void
+_eglSetConfigKey(_EGLConfig *conf, EGLint key, EGLint val)
+{
+   EGLint idx = _eglIndexConfig(conf, key);
+   assert(idx >= 0);
+   conf->Storage[idx] = val;
+}
+
+
+/**
+ * Return the value for a given key.
+ */
+static INLINE EGLint
+_eglGetConfigKey(const _EGLConfig *conf, EGLint key)
+{
+   EGLint idx = _eglIndexConfig(conf, key);
+   assert(idx >= 0);
+   return conf->Storage[idx];
+}
+
+
+/**
+ * Set a given attribute.
+ *
+ * Because _eglGetConfigAttrib is already used as a fallback driver
+ * function, this function is not considered to have a good name.
+ * SET_CONFIG_ATTRIB is preferred over this function.
+ */
+static INLINE void
+_eglSetConfigAttrib(_EGLConfig *conf, EGLint attr, EGLint val)
+{
+   SET_CONFIG_ATTRIB(conf, attr, val);
+}
 
 
 extern void
@@ -57,8 +123,4 @@ extern EGLBoolean
 _eglGetConfigs(_EGLDriver *drv, _EGLDisplay *dpy, EGLConfig *configs, EGLint config_size, EGLint *num_config);
 
 
-extern void
-_eglSetConfigAttrib(_EGLConfig *config, EGLint attr, EGLint val);
-
-
 #endif /* EGLCONFIG_INCLUDED */