mesa: work around failed assertion for GL_RGBA16_SNORM accum buffer

We use this format to represent the accum buffer.  No snorm texture
sampling or rendering takes place.

Fixes failed assertion with swrast and any app using the accum buffer
(and glxinfo).

1 files changed, 14 insertions, 1 deletions

diff --git a/src/mesa/main/renderbuffer.c b/src/mesa/main/renderbuffer.c
index 67ee589..e6d5fe4 100644
--- a/src/mesa/main/renderbuffer.c
+++ b/src/mesa/main/renderbuffer.c
@@ -1122,7 +1122,20 @@ _mesa_soft_renderbuffer_storage(struct gl_context *ctx, struct gl_renderbuffer *
    rb->Width = width;
    rb->Height = height;
    rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
-   ASSERT(rb->_BaseFormat);
+
+   if (rb->Name == 0 &&
+       internalFormat == GL_RGBA16_SNORM &&
+       rb->_BaseFormat == 0) {
+      /* NOTE: This is a special case just for accumulation buffers.
+       * This is a very limited use case- there's no snorm texturing or
+       * rendering going on.
+       */
+      rb->_BaseFormat = GL_RGBA;
+   }
+   else {
+      /* the internalFormat should have been error checked long ago */
+      ASSERT(rb->_BaseFormat);
+   }
 
    return GL_TRUE;
 }