initial EGL code

1 files changed, 286 insertions, 0 deletions

diff --git a/src/egl/main/eglconfig.c b/src/egl/main/eglconfig.c
new file mode 100644
index 0000000000..765e2e3dbe
--- /dev/null
+++ b/src/egl/main/eglconfig.c
@@ -0,0 +1,286 @@
+#include <string.h>
+#include <assert.h>
+#include "eglconfig.h"
+#include "egldisplay.h"
+#include "egldriver.h"
+#include "eglglobals.h"
+
+
+#define MIN2(A, B)  (((A) < (B)) ? (A) : (B))
+
+
+/**
+ * Init the given _EGLconfig to default values.
+ * \param id  the configuration's ID.
+ */
+void
+_eglInitConfig(_EGLConfig *config, EGLint id)
+{
+   memset(config, 0, sizeof(*config));
+   config->Handle = id;
+   SET_CONFIG_ATTRIB(config, EGL_CONFIG_ID,               id);
+   SET_CONFIG_ATTRIB(config, EGL_BIND_TO_TEXTURE_RGB,     EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_BIND_TO_TEXTURE_RGBA,    EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_CONFIG_CAVEAT,           EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_NATIVE_RENDERABLE,       EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_NATIVE_VISUAL_TYPE,      EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_MIN_SWAP_INTERVAL,       EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_MAX_SWAP_INTERVAL,       EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_SURFACE_TYPE,            EGL_WINDOW_BIT);
+   SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_TYPE,        EGL_NONE);
+   SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_RED_VALUE,   EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_GREEN_VALUE, EGL_DONT_CARE);
+   SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_BLUE_VALUE,  EGL_DONT_CARE);
+}
+
+
+/**
+ * Given an EGLConfig handle, return the corresponding _EGLConfig object.
+ */
+_EGLConfig *
+_eglLookupConfig(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config)
+{
+   EGLint i;
+   _EGLDisplay *disp = _eglLookupDisplay(dpy);
+   for (i = 0; i < disp->NumConfigs; i++) {
+      if (disp->Configs[i].Handle == config) {
+          return disp->Configs + i;
+      }
+   }
+   return NULL;
+}
+
+
+
+/**
+ * Parse the attrib_list to fill in the fields of the given _egl_config
+ * Return EGL_FALSE if any errors, EGL_TRUE otherwise.
+ */
+EGLBoolean
+_eglParseConfigAttribs(_EGLConfig *config, const EGLint *attrib_list)
+{
+   EGLint i;
+
+   /* XXX set all config attribs to EGL_DONT_CARE */
+
+   for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
+      EGLint k = attrib_list[i] - FIRST_ATTRIB;
+      if (k >= 0 && k < MAX_ATTRIBS) {
+         config->Attrib[k] = attrib_list[++i];
+      }
+      else {
+         _eglError(EGL_BAD_ATTRIBUTE, "eglChooseConfig");
+         return EGL_FALSE;
+      }
+   }
+   return EGL_TRUE;
+}
+
+
+#define EXACT 1
+#define ATLEAST 2
+#define MASK 3
+#define SMALLER 4
+#define SPECIAL 5
+#define NONE 6
+
+struct sort_info {
+   EGLint Attribute;
+   EGLint MatchCriteria;
+   EGLint SortOrder;
+};
+
+/* This encodes the info from Table 3.5 of the EGL spec, ordered by
+ * Sort Priority.
+ */
+static struct sort_info SortInfo[] = {
+   { EGL_CONFIG_CAVEAT,           EXACT,   SPECIAL },
+   { EGL_RED_SIZE,                ATLEAST, SPECIAL },
+   { EGL_GREEN_SIZE,              ATLEAST, SPECIAL },
+   { EGL_BLUE_SIZE,               ATLEAST, SPECIAL },
+   { EGL_ALPHA_SIZE,              ATLEAST, SPECIAL },
+   { EGL_BUFFER_SIZE,             ATLEAST, SMALLER },
+   { EGL_SAMPLE_BUFFERS,          ATLEAST, SMALLER },
+   { EGL_SAMPLES,                 ATLEAST, SMALLER },
+   { EGL_DEPTH_SIZE,              ATLEAST, SMALLER },
+   { EGL_STENCIL_SIZE,            ATLEAST, SMALLER },
+   { EGL_NATIVE_VISUAL_TYPE,      EXACT,   SPECIAL },
+   { EGL_CONFIG_ID,               EXACT,   SMALLER },
+   { EGL_BIND_TO_TEXTURE_RGB,     EXACT,   NONE    },
+   { EGL_BIND_TO_TEXTURE_RGBA,    EXACT,   NONE    },
+   { EGL_LEVEL,                   EXACT,   NONE    },
+   { EGL_NATIVE_RENDERABLE,       EXACT,   NONE    },
+   { EGL_MAX_SWAP_INTERVAL,       EXACT,   NONE    },
+   { EGL_MIN_SWAP_INTERVAL,       EXACT,   NONE    },
+   { EGL_SURFACE_TYPE,            MASK,    NONE    },
+   { EGL_TRANSPARENT_TYPE,        EXACT,   NONE    },
+   { EGL_TRANSPARENT_RED_VALUE,   EXACT,   NONE    },
+   { EGL_TRANSPARENT_GREEN_VALUE, EXACT,   NONE    },
+   { EGL_TRANSPARENT_BLUE_VALUE,  EXACT,   NONE    },
+   { 0, 0, 0 }
+};
+
+
+/**
+ * Return EGL_TRUE if the attributes of c meet or exceed the minimums
+ * specified by min.
+ */
+EGLBoolean
+_eglConfigQualifies(const _EGLConfig *c, const _EGLConfig *min)
+{
+   EGLint i;
+   for (i = 0; SortInfo[i].Attribute != 0; i++) {
+      const EGLint mv = GET_CONFIG_ATTRIB(min, SortInfo[i].Attribute);
+      if (mv != EGL_DONT_CARE) {
+         const EGLint cv = GET_CONFIG_ATTRIB(c, SortInfo[i].Attribute);
+         if (SortInfo[i].MatchCriteria == EXACT) {
+            if (cv != mv) {
+               return EGL_FALSE;
+            }
+         }
+         else if (SortInfo[i].MatchCriteria == ATLEAST) {
+            if (cv < mv) {
+               return EGL_FALSE;
+            }
+         }
+         else {
+            assert(SortInfo[i].MatchCriteria == MASK);
+            if ((mv & cv) != mv) {
+               return EGL_FALSE;
+            }
+         }
+      }
+   }
+   return EGL_TRUE;
+}
+
+
+/**
+ * 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.
+ */
+EGLint
+_eglCompareConfigs(const _EGLConfig *a, 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);
+      if (SortInfo[i].SortOrder == SMALLER) {
+         if (av < bv)
+            return -1;
+         else if (av > bv)
+            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)
+               return -1;
+            else if (av > bv)
+               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)
+               return -1;
+            else if (av < bv)
+               return 1;
+         }
+         else {
+            assert(SortInfo[i].Attribute == EGL_NATIVE_VISUAL_TYPE);
+            if (av < bv)
+               return -1;
+            else if (av > bv)
+               return 1;
+         }
+      }
+      else {
+         assert(SortInfo[i].SortOrder == NONE);
+         /* continue examining attribute values */
+      }
+   }
+   return 0;
+}
+
+
+/**
+ * Typical fallback routine for eglChooseConfig
+ */
+EGLBoolean
+_eglChooseConfig(_EGLDriver *drv, EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config)
+{
+   _EGLDisplay *disp = _eglLookupDisplay(dpy);
+   _EGLConfig criteria;
+   EGLint i;
+
+   /* 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;
+         }
+      }
+   }
+
+   /* XXX sort the list here */
+
+   return EGL_TRUE;
+}
+
+
+/**
+ * Fallback for eglGetConfigAttrib.
+ */
+EGLBoolean
+_eglGetConfigAttrib(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint *value)
+{
+   const _EGLConfig *conf = _eglLookupConfig(drv, dpy, config);
+   const EGLint k = attribute - FIRST_ATTRIB;
+   if (k >= 0 && k < MAX_ATTRIBS) {
+      *value = conf->Attrib[k];
+      return EGL_TRUE;
+   }
+   else {
+      _eglError(EGL_BAD_ATTRIBUTE, "eglGetConfigAttrib");
+      return EGL_FALSE;
+   }
+}
+
+
+/**
+ * Fallback for eglGetConfigs.
+ */
+EGLBoolean
+_eglGetConfigs(_EGLDriver *drv, EGLDisplay dpy, EGLConfig *configs, EGLint config_size, EGLint *num_config)
+{
+   _EGLDisplay *disp = _eglLookupDisplay(dpy);
+
+   if (!drv->Initialized) {
+      _eglError(EGL_NOT_INITIALIZED, "eglGetConfigs");
+      return EGL_FALSE;
+   }
+
+   *num_config = MIN2(disp->NumConfigs, config_size);
+   if (configs) {
+      EGLint i;
+      for (i = 0; i < *num_config; i++) {
+         configs[i] = disp->Configs[i].Handle;
+      }
+   }
+   return EGL_TRUE;
+}