mesa: add KHR_no_error support for glBufferStorage()

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/mapi/glapi/gen/gl_API.xml

@@ -8262,7 +8262,7 @@
     <enum name="BUFFER_STORAGE_FLAGS" value="0x8220" />
     <enum name="CLIENT_MAPPED_BUFFER_BARRIER_BIT" value="0x4000" />
 
-    <function name="BufferStorage">
+    <function name="BufferStorage" no_error="true">
         <param name="target" type="GLenum"/>
         <param name="size" type="GLsizeiptr"/>
         <param name="data" type="const GLvoid *"/>

src/mesa/main/bufferobj.c

@@ -1609,9 +1609,14 @@ inlined_buffer_storage(GLenum target, GLuint buffer, GLsizeiptr size,
             return;
       }
    } else {
-      bufObj = get_buffer(ctx, func, target, GL_INVALID_OPERATION);
-      if (!bufObj)
-         return;
+      if (no_error) {
+         struct gl_buffer_object **bufObjPtr = get_buffer_target(ctx, target);
+         bufObj = *bufObjPtr;
+      } else {
+         bufObj = get_buffer(ctx, func, target, GL_INVALID_OPERATION);
+         if (!bufObj)
+            return;
+      }
    }
 
    if (no_error || validate_buffer_storage(ctx, bufObj, size, flags, func))
@@ -1619,6 +1624,15 @@ inlined_buffer_storage(GLenum target, GLuint buffer, GLsizeiptr size,
 }
 
 
+void GLAPIENTRY
+_mesa_BufferStorage_no_error(GLenum target, GLsizeiptr size,
+                             const GLvoid *data, GLbitfield flags)
+{
+   inlined_buffer_storage(target, 0, size, data, flags, false, true,
+                          "glBufferStorage");
+}
+
+
 void GLAPIENTRY
 _mesa_BufferStorage(GLenum target, GLsizeiptr size, const GLvoid *data,
                     GLbitfield flags)

src/mesa/main/bufferobj.h

@@ -171,6 +171,9 @@ _mesa_CreateBuffers(GLsizei n, GLuint *buffers);
 GLboolean GLAPIENTRY
 _mesa_IsBuffer(GLuint buffer);
 
+void GLAPIENTRY
+_mesa_BufferStorage_no_error(GLenum target, GLsizeiptr size,
+                             const GLvoid *data, GLbitfield flags);
 void GLAPIENTRY
 _mesa_BufferStorage(GLenum target, GLsizeiptr size, const GLvoid *data,
                     GLbitfield flags);