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authorBrian Paul <brian.paul@tungstengraphics.com>2005-12-10 17:51:13 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2005-12-10 17:51:13 +0000
commit6002d2ff4ed9f465d1c5bf05caea83f1522ecf3d (patch)
treeedb26aa8ec94bac06df873de952ab3e426b7902c /src/egl
parent21b2784ff52cc4e61082e3aa9a8b1714862505b2 (diff)
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implement config sorting for eglChooseConfig()
Diffstat (limited to 'src/egl')
-rw-r--r--src/egl/main/eglconfig.c84
-rw-r--r--src/egl/main/eglconfig.h8
2 files changed, 51 insertions, 41 deletions
diff --git a/src/egl/main/eglconfig.c b/src/egl/main/eglconfig.c
index dea6002..96f47d9 100644
--- a/src/egl/main/eglconfig.c
+++ b/src/egl/main/eglconfig.c
@@ -113,7 +113,7 @@ _eglLookupConfig(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config)
/**
- * Add the given _EGLConifg to the given display.
+ * Add the given _EGLConfig to the given display.
*/
_EGLConfig *
_eglAddConfig(_EGLDisplay *display, const _EGLConfig *config)
@@ -139,7 +139,7 @@ _eglAddConfig(_EGLDisplay *display, const _EGLConfig *config)
/**
- * Parse the attrib_list to fill in the fields of the given _egl_config
+ * Parse the attrib_list to fill in the fields of the given _eglConfig
* Return EGL_FALSE if any errors, EGL_TRUE otherwise.
*/
EGLBoolean
@@ -217,7 +217,7 @@ static struct sort_info SortInfo[] = {
* Return EGL_TRUE if the attributes of c meet or exceed the minimums
* specified by min.
*/
-EGLBoolean
+static EGLBoolean
_eglConfigQualifies(const _EGLConfig *c, const _EGLConfig *min)
{
EGLint i;
@@ -250,43 +250,47 @@ _eglConfigQualifies(const _EGLConfig *c, const _EGLConfig *min)
/**
* Compare configs 'a' and 'b' and return -1 if a belongs before b,
* 1 if a belongs after b, or 0 if they're equal.
+ * Used by qsort().
*/
-EGLint
-_eglCompareConfigs(const _EGLConfig *a, const _EGLConfig *b)
+static int
+_eglCompareConfigs(const void *a, const void *b)
{
+ const _EGLConfig *aConfig = (const _EGLConfig *) a;
+ const _EGLConfig *bConfig = (const _EGLConfig *) b;
EGLint i;
+
for (i = 0; SortInfo[i].Attribute != 0; i++) {
- const EGLint av = GET_CONFIG_ATTRIB(a, SortInfo[i].Attribute);
- const EGLint bv = GET_CONFIG_ATTRIB(b, SortInfo[i].Attribute);
+ const EGLint aVal = GET_CONFIG_ATTRIB(aConfig, SortInfo[i].Attribute);
+ const EGLint bVal = GET_CONFIG_ATTRIB(bConfig, SortInfo[i].Attribute);
if (SortInfo[i].SortOrder == SMALLER) {
- if (av < bv)
+ if (aVal < bVal)
return -1;
- else if (av > bv)
+ else if (aVal > bVal)
return 1;
/* else, continue examining attribute values */
}
else if (SortInfo[i].SortOrder == SPECIAL) {
if (SortInfo[i].Attribute == EGL_CONFIG_CAVEAT) {
/* values are EGL_NONE, SLOW_CONFIG, or NON_CONFORMANT_CONFIG */
- if (av < bv)
+ if (aVal < bVal)
return -1;
- else if (av > bv)
+ else if (aVal > bVal)
return 1;
}
else if (SortInfo[i].Attribute == EGL_RED_SIZE ||
SortInfo[i].Attribute == EGL_GREEN_SIZE ||
SortInfo[i].Attribute == EGL_BLUE_SIZE ||
SortInfo[i].Attribute == EGL_ALPHA_SIZE) {
- if (av > bv)
+ if (aVal > bVal)
return -1;
- else if (av < bv)
+ else if (aVal < bVal)
return 1;
}
else {
assert(SortInfo[i].Attribute == EGL_NATIVE_VISUAL_TYPE);
- if (av < bv)
+ if (aVal < bVal)
return -1;
- else if (av > bv)
+ else if (aVal > bVal)
return 1;
}
}
@@ -295,6 +299,8 @@ _eglCompareConfigs(const _EGLConfig *a, const _EGLConfig *b)
/* continue examining attribute values */
}
}
+
+ /* all attributes identical */
return 0;
}
@@ -304,33 +310,42 @@ _eglCompareConfigs(const _EGLConfig *a, const _EGLConfig *b)
*/
EGLBoolean
_eglChooseConfig(_EGLDriver *drv, EGLDisplay dpy, const EGLint *attrib_list,
- EGLConfig *configs, EGLint config_size, EGLint *num_config)
+ EGLConfig *configs, EGLint config_size, EGLint *num_configs)
{
_EGLDisplay *disp = _eglLookupDisplay(dpy);
- _EGLConfig criteria;
- EGLint i;
+ _EGLConfig **configList, criteria;
+ EGLint i, count;
/* parse the attrib_list to initialize criteria */
if (!_eglParseConfigAttribs(&criteria, attrib_list)) {
return EGL_FALSE;
}
- *num_config = 0;
- for (i = 0; i < disp->NumConfigs; i++) {
- const _EGLConfig *conf = disp->Configs + i;
- if (_eglConfigQualifies(conf, &criteria)) {
- if (*num_config < config_size) {
- /* save */
- configs[*num_config] = conf->Handle;
- (*num_config)++;
- }
- else {
- break;
- }
+ /* allocate array of config pointers */
+ configList = (_EGLConfig **) malloc(config_size * sizeof(_EGLConfig *));
+ if (!configList) {
+ _eglError(EGL_BAD_CONFIG, "eglChooseConfig(out of memory)");
+ return EGL_FALSE;
+ }
+
+ /* make array of pointers to qualifying configs */
+ for (i = count = 0; i < disp->NumConfigs && count < config_size; i++) {
+ if (_eglConfigQualifies(disp->Configs + i, &criteria)) {
+ configList[count++] = disp->Configs + i;
}
}
- /* XXX sort the list here */
+ /* sort array of pointers */
+ qsort(configList, count, sizeof(_EGLConfig *), _eglCompareConfigs);
+
+ /* copy config handles to output array */
+ for (i = 0; i < count; i++) {
+ configs[i] = configList[i]->Handle;
+ }
+
+ free(configList);
+
+ *num_configs = count;
return EGL_TRUE;
}
@@ -376,9 +391,12 @@ _eglGetConfigs(_EGLDriver *drv, EGLDisplay dpy, EGLConfig *configs,
for (i = 0; i < *num_config; i++) {
configs[i] = disp->Configs[i].Handle;
}
- } else
+ }
+ else {
+ /* just return total number of supported configs */
*num_config = disp->NumConfigs;
-
+ }
+
return EGL_TRUE;
}
diff --git a/src/egl/main/eglconfig.h b/src/egl/main/eglconfig.h
index 65ce0f3..1fb976e 100644
--- a/src/egl/main/eglconfig.h
+++ b/src/egl/main/eglconfig.h
@@ -38,14 +38,6 @@ _eglParseConfigAttribs(_EGLConfig *config, const EGLint *attrib_list);
extern EGLBoolean
-_eglConfigQualifies(const _EGLConfig *c, const _EGLConfig *min);
-
-
-extern EGLint
-_eglCompareConfigs(const _EGLConfig *a, const _EGLConfig *b);
-
-
-extern EGLBoolean
_eglChooseConfig(_EGLDriver *drv, EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config);