st/wgl: Implement WGL_EXT_create_context_es/es2_profile.

Derived from st/glx's GLX_EXT_create_context_es/es2_profile implementation.

Tested with an OpenGL ES 2.0 ApiTrace.

Reviewed-by: Brian Paul <brianp@vmware.com>

3 files changed, 78 insertions, 63 deletions

diff --git a/src/gallium/state_trackers/wgl/stw_context.c b/src/gallium/state_trackers/wgl/stw_context.c
index 99debfddadc..2ed6c2bfac9 100644
--- a/src/gallium/state_trackers/wgl/stw_context.c
+++ b/src/gallium/state_trackers/wgl/stw_context.c
@@ -201,35 +201,51 @@ stw_create_context_attribs(HDC hdc, INT iLayerPlane, DHGLRC hShareContext,
    if (contextFlags & WGL_CONTEXT_DEBUG_BIT_ARB)
       attribs.flags |= ST_CONTEXT_FLAG_DEBUG;
 
-   /* There are no profiles before OpenGL 3.2.  The
-    * WGL_ARB_create_context_profile spec says:
-    *
-    *     "If the requested OpenGL version is less than 3.2,
-    *     WGL_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality of the
-    *     context is determined solely by the requested version."
-    *
-    * The spec also says:
-    *
-    *     "The default value for WGL_CONTEXT_PROFILE_MASK_ARB is
-    *     WGL_CONTEXT_CORE_PROFILE_BIT_ARB."
-    *
-    * The spec also says:
-    *
-    *     "If version 3.1 is requested, the context returned may implement
-    *     any of the following versions:
-    *
-    *       * Version 3.1. The GL_ARB_compatibility extension may or may not
-    *         be implemented, as determined by the implementation.
-    *       * The core profile of version 3.2 or greater."
-    *
-    * and because Mesa doesn't support GL_ARB_compatibility, the only chance to
-    * honour a 3.1 context is through core profile.
-    */
-   attribs.profile = ST_PROFILE_DEFAULT;
-   if (((majorVersion > 3 || (majorVersion == 3 && minorVersion >= 2))
-        && ((profileMask & WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB) == 0)) ||
-       (majorVersion == 3 && minorVersion == 1))
-      attribs.profile = ST_PROFILE_OPENGL_CORE;
+   switch (profileMask) {
+   case WGL_CONTEXT_CORE_PROFILE_BIT_ARB:
+      /* There are no profiles before OpenGL 3.2.  The
+       * WGL_ARB_create_context_profile spec says:
+       *
+       *     "If the requested OpenGL version is less than 3.2,
+       *     WGL_CONTEXT_PROFILE_MASK_ARB is ignored and the functionality
+       *     of the context is determined solely by the requested version."
+       */
+      if (majorVersion > 3 || (majorVersion == 3 && minorVersion >= 2)) {
+         attribs.profile = ST_PROFILE_OPENGL_CORE;
+         break;
+      }
+      /* fall-through */
+   case WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB:
+      /*
+       * The spec also says:
+       *
+       *     "If version 3.1 is requested, the context returned may implement
+       *     any of the following versions:
+       *
+       *       * Version 3.1. The GL_ARB_compatibility extension may or may not
+       *         be implemented, as determined by the implementation.
+       *       * The core profile of version 3.2 or greater."
+       *
+       * and because Mesa doesn't support GL_ARB_compatibility, the only chance to
+       * honour a 3.1 context is through core profile.
+       */
+      if (majorVersion == 3 && minorVersion == 1) {
+         attribs.profile = ST_PROFILE_OPENGL_CORE;
+      } else {
+         attribs.profile = ST_PROFILE_DEFAULT;
+      }
+      break;
+   case WGL_CONTEXT_ES_PROFILE_BIT_EXT:
+      if (majorVersion >= 2) {
+         attribs.profile = ST_PROFILE_OPENGL_ES2;
+      } else {
+         attribs.profile = ST_PROFILE_OPENGL_ES1;
+      }
+      break;
+   default:
+      assert(0);
+      goto no_st_ctx;
+   }
 
    ctx->st = stw_dev->stapi->create_context(stw_dev->stapi,
          stw_dev->smapi, &attribs, &ctx_err, shareCtx ? shareCtx->st : NULL);
diff --git a/src/gallium/state_trackers/wgl/stw_ext_context.c b/src/gallium/state_trackers/wgl/stw_ext_context.c
index 451f3300209..8a96cac4385 100644
--- a/src/gallium/state_trackers/wgl/stw_ext_context.c
+++ b/src/gallium/state_trackers/wgl/stw_ext_context.c
@@ -62,6 +62,8 @@ wglCreateContextAttribsARB(HDC hDC, HGLRC hShareContext, const int *attribList)
    int profileMask = WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
    int i;
    BOOL done = FALSE;
+   const int contextFlagsAll = (WGL_CONTEXT_DEBUG_BIT_ARB |
+                                WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB);
 
    /* parse attrib_list */
    if (attribList) {
@@ -94,34 +96,36 @@ wglCreateContextAttribsARB(HDC hDC, HGLRC hShareContext, const int *attribList)
       }
    }
 
+   /* check contextFlags */
+   if (contextFlags & ~contextFlagsAll) {
+      SetLastError(ERROR_INVALID_PARAMETER);
+      return NULL;
+   }
+
+   /* check profileMask */
+   if (profileMask != WGL_CONTEXT_CORE_PROFILE_BIT_ARB &&
+       profileMask != WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB &&
+       profileMask != WGL_CONTEXT_ES_PROFILE_BIT_EXT) {
+      SetLastError(ERROR_INVALID_PROFILE_ARB);
+      return NULL;
+   }
+
    /* check version (generate ERROR_INVALID_VERSION_ARB if bad) */
-   switch (majorVersion) {
-   case 1:
-      if (minorVersion < 0 || minorVersion > 5) {
-         SetLastError(ERROR_INVALID_VERSION_ARB);
-         return 0;
-      }
-      break;
-   case 2:
-      if (minorVersion < 0 || minorVersion > 1) {
-         SetLastError(ERROR_INVALID_VERSION_ARB);
-         return 0;
-      }
-      break;
-   case 3:
-      if (minorVersion < 0 || minorVersion > 3) {
-         SetLastError(ERROR_INVALID_VERSION_ARB);
-         return 0;
-      }
-      break;
-   case 4:
-      if (minorVersion < 0 || minorVersion > 2) {
-         SetLastError(ERROR_INVALID_VERSION_ARB);
-         return 0;
-      }
-      break;
-   default:
-      return 0;
+   if (majorVersion <= 0 ||
+       minorVersion < 0 ||
+       (profileMask != WGL_CONTEXT_ES_PROFILE_BIT_EXT &&
+        ((majorVersion == 1 && minorVersion > 5) ||
+         (majorVersion == 2 && minorVersion > 1) ||
+         (majorVersion == 3 && minorVersion > 3) ||
+         (majorVersion == 4 && minorVersion > 5) ||
+         majorVersion > 4)) ||
+       (profileMask == WGL_CONTEXT_ES_PROFILE_BIT_EXT &&
+        ((majorVersion == 1 && minorVersion > 1) ||
+         (majorVersion == 2 && minorVersion > 0) ||
+         (majorVersion == 3 && minorVersion > 1) ||
+         majorVersion > 3))) {
+      SetLastError(ERROR_INVALID_VERSION_ARB);
+      return NULL;
    }
 
    if ((contextFlags & WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB) &&
@@ -130,13 +134,6 @@ wglCreateContextAttribsARB(HDC hDC, HGLRC hShareContext, const int *attribList)
       return 0;
    }
 
-   /* check profileMask */
-   if (profileMask != WGL_CONTEXT_CORE_PROFILE_BIT_ARB &&
-       profileMask != WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB) {
-      SetLastError(ERROR_INVALID_PROFILE_ARB);
-      return 0;
-   }
-
    /* Get pointer to OPENGL32.DLL's wglCreate/DeleteContext() functions */
    if (opengl_lib == 0) {
       /* Open the OPENGL32.DLL library */
diff --git a/src/gallium/state_trackers/wgl/stw_ext_extensionsstring.c b/src/gallium/state_trackers/wgl/stw_ext_extensionsstring.c
index 06a152bd51f..a8c085a1341 100644
--- a/src/gallium/state_trackers/wgl/stw_ext_extensionsstring.c
+++ b/src/gallium/state_trackers/wgl/stw_ext_extensionsstring.c
@@ -41,6 +41,8 @@ static const char *stw_extension_string =
    "WGL_ARB_multisample "
    "WGL_ARB_pbuffer "
    "WGL_ARB_pixel_format "
+   "WGL_EXT_create_context_es_profile "
+   "WGL_EXT_create_context_es2_profile "
 /*   "WGL_EXT_swap_interval " */
    "WGL_EXT_extensions_string";