intel: Move validation of context version into intelInitContext

Each driver (i830, i915, i965) used independent but similar code to
validate the requested context version. With the rececnt arrival of GLES3,
that logic has needed an update. Rather than apply identical updates to
each drivers validation code, let's just move the validation into the
shared routine intelInitContext.

This refactor required some incidental changes to functions
i830CreateContext and intelInitContext. For each function, this patch:
    - Adds context version parameters to the signature.
    - Adds a DRI_CTX_ERROR out param to the signature.
    - Sets the DRI_CTX_ERROR at each early return.

Tested against gen6 with piglit egl-create-context-verify-gl-flavor.
Verified that this patch does not change the set of exposed EGL context
flavors.

Signed-off-by: Chad Versace <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

3 files changed, 70 insertions, 30 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 37a8e585c6d..7bfc49a7f05 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -580,13 +580,55 @@ intelInitDriverFunctions(struct dd_function_table *functions)
    intel_init_syncobj_functions(functions);
 }
 
+static bool
+validate_context_version(struct intel_screen *screen,
+                         int mesa_api,
+                         unsigned major_version,
+                         unsigned minor_version,
+                         unsigned *dri_ctx_error)
+{
+   unsigned req_version = 10 * major_version + minor_version;
+   unsigned max_version = 0;
+
+   switch (mesa_api) {
+   case API_OPENGL_COMPAT:
+      max_version = screen->max_gl_compat_version;
+      break;
+   case API_OPENGL_CORE:
+      max_version = screen->max_gl_core_version;
+      break;
+   case API_OPENGLES:
+      max_version = screen->max_gl_es1_version;
+      break;
+   case API_OPENGLES2:
+      max_version = screen->max_gl_es2_version;
+      break;
+   default:
+      max_version = 0;
+      break;
+   }
+
+   if (max_version == 0) {
+      *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
+      return false;
+   } else if (req_version > max_version) {
+      *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
+      return false;
+   }
+
+   return true;
+}
+
 bool
 intelInitContext(struct intel_context *intel,
-		 int api,
+                 int api,
+                 unsigned major_version,
+                 unsigned minor_version,
                  const struct gl_config * mesaVis,
                  __DRIcontext * driContextPriv,
                  void *sharedContextPrivate,
-                 struct dd_function_table *functions)
+                 struct dd_function_table *functions,
+                 unsigned *dri_ctx_error)
 {
    struct gl_context *ctx = &intel->ctx;
    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
@@ -596,7 +638,14 @@ intelInitContext(struct intel_context *intel,
    struct gl_config visual;
 
    /* we can't do anything without a connection to the device */
-   if (intelScreen->bufmgr == NULL)
+   if (intelScreen->bufmgr == NULL) {
+      *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
+      return false;
+   }
+
+   if (!validate_context_version(intelScreen,
+                                 api, major_version, minor_version,
+                                 dri_ctx_error))
       return false;
 
    /* Can't rely on invalidate events, fall back to glViewport hack */
@@ -614,6 +663,7 @@ intelInitContext(struct intel_context *intel,
 
    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
                                  functions)) {
+      *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
       printf("%s: failed to init mesa context\n", __FUNCTION__);
       return false;
    }
diff --git a/src/mesa/drivers/dri/intel/intel_context.h b/src/mesa/drivers/dri/intel/intel_context.h
index 7ce7c2542a3..80e4cac131d 100644
--- a/src/mesa/drivers/dri/intel/intel_context.h
+++ b/src/mesa/drivers/dri/intel/intel_context.h
@@ -502,11 +502,14 @@ extern int INTEL_DEBUG;
  */
 
 extern bool intelInitContext(struct intel_context *intel,
-				  int api,
-                                  const struct gl_config * mesaVis,
-                                  __DRIcontext * driContextPriv,
-                                  void *sharedContextPrivate,
-                                  struct dd_function_table *functions);
+                             int api,
+                             unsigned major_version,
+                             unsigned minor_version,
+                             const struct gl_config * mesaVis,
+                             __DRIcontext * driContextPriv,
+                             void *sharedContextPrivate,
+                             struct dd_function_table *functions,
+                             unsigned *dri_ctx_error);
 
 extern void intelFinish(struct gl_context * ctx);
 extern void intel_flush_rendering_to_batch(struct gl_context *ctx);
diff --git a/src/mesa/drivers/dri/intel/intel_screen.c b/src/mesa/drivers/dri/intel/intel_screen.c
index a001fddd962..d88c119f427 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.c
+++ b/src/mesa/drivers/dri/intel/intel_screen.c
@@ -754,8 +754,12 @@ intelDestroyBuffer(__DRIdrawable * driDrawPriv)
  * functions.
  */
 extern bool
-i830CreateContext(const struct gl_config *mesaVis,
+i830CreateContext(int api,
+                  const struct gl_config *mesaVis,
 		  __DRIcontext *driContextPriv,
+		  unsigned major_version,
+		  unsigned minor_version,
+		  unsigned *error,
 		  void *sharedContextPrivate);
 
 extern bool
@@ -797,27 +801,10 @@ intelCreateContext(gl_api api,
                                   major_version, minor_version, error,
                                   sharedContextPrivate);
    } else {
-      switch (api) {
-      case API_OPENGL_COMPAT:
-         if (major_version > 1 || minor_version > 3) {
-            *error = __DRI_CTX_ERROR_BAD_VERSION;
-            success = false;
-         }
-         break;
-      case API_OPENGLES:
-         break;
-      default:
-         *error = __DRI_CTX_ERROR_BAD_API;
-         success = false;
-      }
-
-      if (success) {
-         intelScreen->no_vbo = true;
-         success = i830CreateContext(mesaVis, driContextPriv,
-                                     sharedContextPrivate);
-         if (!success)
-            *error = __DRI_CTX_ERROR_NO_MEMORY;
-      }
+      intelScreen->no_vbo = true;
+      success = i830CreateContext(api, mesaVis, driContextPriv,
+                                  major_version, minor_version, error,
+                                  sharedContextPrivate);
    }
 #else
    success = brwCreateContext(api, mesaVis,