glthread: handle buffer unbinding via glDeleteBuffers

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4124>

src/mapi/glapi/gen/gl_API.xml

@@ -5078,7 +5078,8 @@
         <glx ignore="true"/>
     </function>
 
-    <function name="DeleteBuffers" es1="1.1" es2="2.0" no_error="true">
+    <function name="DeleteBuffers" es1="1.1" es2="2.0" no_error="true"
+              marshal_call_after="if (COMPAT) _mesa_glthread_DeleteBuffers(ctx, n, buffer);">
         <param name="n" type="GLsizei" counter="true"/>
         <param name="buffer" type="const GLuint *" count="n"/>
         <glx ignore="true"/>

src/mesa/main/glthread.h

@@ -54,7 +54,7 @@ struct _mesa_HashTable;
 struct glthread_vao {
    GLuint Name;
    bool HasUserPointer;
-   bool IndexBufferIsUserPointer;
+   GLuint CurrentElementBufferName;
 };
 
 /** A single batch of commands queued up for execution. */
@@ -104,17 +104,9 @@ struct glthread_state
    struct glthread_vao *LastLookedUpVAO;
    struct glthread_vao DefaultVAO;
 
-   /**
+   /** Currently-bound buffer object IDs. */
-    * Tracks on the main thread side whether the current vertex array binding
+   GLuint CurrentArrayBufferName;
-    * is in a VBO.
+   GLuint CurrentDrawIndirectBufferName;
-    */
-   bool vertex_array_is_vbo;
-
-   /**
-    * Tracks on the main thread side whether the current element array (index
-    * buffer) binding is in a VBO.
-    */
-   bool draw_indirect_buffer_is_vbo;
 };
 
 void _mesa_glthread_init(struct gl_context *ctx);
@@ -126,6 +118,11 @@ void _mesa_glthread_flush_batch(struct gl_context *ctx);
 void _mesa_glthread_finish(struct gl_context *ctx);
 void _mesa_glthread_finish_before(struct gl_context *ctx, const char *func);
 
+void _mesa_glthread_BindBuffer(struct gl_context *ctx, GLenum target,
+                               GLuint buffer);
+void _mesa_glthread_DeleteBuffers(struct gl_context *ctx, GLsizei n,
+                                  const GLuint *buffers);
+
 void _mesa_glthread_BindVertexArray(struct gl_context *ctx, GLuint id);
 void _mesa_glthread_DeleteVertexArrays(struct gl_context *ctx,
                                        GLsizei n, const GLuint *ids);

src/mesa/main/glthread_bufferobj.c

@@ -54,21 +54,41 @@ _mesa_glthread_BindBuffer(struct gl_context *ctx, GLenum target, GLuint buffer)
 
    switch (target) {
    case GL_ARRAY_BUFFER:
-      glthread->vertex_array_is_vbo = (buffer != 0);
+      glthread->CurrentArrayBufferName = buffer;
       break;
    case GL_ELEMENT_ARRAY_BUFFER:
       /* The current element array buffer binding is actually tracked in the
        * vertex array object instead of the context, so this would need to
        * change on vertex array object updates.
        */
-      glthread->CurrentVAO->IndexBufferIsUserPointer = buffer != 0;
+      glthread->CurrentVAO->CurrentElementBufferName = buffer;
       break;
    case GL_DRAW_INDIRECT_BUFFER:
-      glthread->draw_indirect_buffer_is_vbo = buffer != 0;
+      glthread->CurrentDrawIndirectBufferName = buffer;
       break;
    }
 }
 
+void
+_mesa_glthread_DeleteBuffers(struct gl_context *ctx, GLsizei n,
+                             const GLuint *buffers)
+{
+   struct glthread_state *glthread = &ctx->GLThread;
+
+   if (!buffers)
+      return;
+
+   for (unsigned i = 0; i < n; i++) {
+      GLuint id = buffers[i];
+
+      if (id == glthread->CurrentArrayBufferName)
+         _mesa_glthread_BindBuffer(ctx, GL_ARRAY_BUFFER, 0);
+      if (id == glthread->CurrentVAO->CurrentElementBufferName)
+         _mesa_glthread_BindBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER, 0);
+      if (id == glthread->CurrentDrawIndirectBufferName)
+         _mesa_glthread_BindBuffer(ctx, GL_DRAW_INDIRECT_BUFFER, 0);
+   }
+}
 
 /* BufferData: marshalled asynchronously */
 struct marshal_cmd_BufferData

src/mesa/main/glthread_marshal.h

@@ -81,10 +81,10 @@ static inline bool
 _mesa_glthread_is_non_vbo_draw_elements(const struct gl_context *ctx)
 {
    const struct glthread_state *glthread = &ctx->GLThread;
+   struct glthread_vao *vao = glthread->CurrentVAO;
 
    return ctx->API != API_OPENGL_CORE &&
-          (glthread->CurrentVAO->IndexBufferIsUserPointer ||
+          (vao->CurrentElementBufferName == 0 || vao->HasUserPointer);
-           glthread->CurrentVAO->HasUserPointer);
 }
 
 static inline bool
@@ -101,28 +101,25 @@ _mesa_glthread_is_non_vbo_draw_arrays_indirect(const struct gl_context *ctx)
    const struct glthread_state *glthread = &ctx->GLThread;
 
    return ctx->API != API_OPENGL_CORE &&
-          (!glthread->draw_indirect_buffer_is_vbo ||
+          (glthread->CurrentDrawIndirectBufferName == 0 ||
-           glthread->CurrentVAO->HasUserPointer );
+           glthread->CurrentVAO->HasUserPointer);
 }
 
 static inline bool
 _mesa_glthread_is_non_vbo_draw_elements_indirect(const struct gl_context *ctx)
 {
    const struct glthread_state *glthread = &ctx->GLThread;
+   struct glthread_vao *vao = glthread->CurrentVAO;
 
    return ctx->API != API_OPENGL_CORE &&
-          (!glthread->draw_indirect_buffer_is_vbo ||
+          (glthread->CurrentDrawIndirectBufferName == 0 ||
-           glthread->CurrentVAO->IndexBufferIsUserPointer ||
+           vao->CurrentElementBufferName == 0 || vao->HasUserPointer);
-           glthread->CurrentVAO->HasUserPointer);
 }
 
 
 struct _glapi_table *
 _mesa_create_marshal_table(const struct gl_context *ctx);
 
-void
-_mesa_glthread_BindBuffer(struct gl_context *ctx, GLenum target, GLuint buffer);
-
 static inline unsigned
 _mesa_buffer_enum_to_count(GLenum buffer)
 {

src/mesa/main/glthread_varray.c

@@ -124,12 +124,11 @@ _mesa_glthread_GenVertexArrays(struct gl_context *ctx,
       GLuint id = arrays[i];
       struct glthread_vao *vao;
 
-      vao = malloc(sizeof(*vao));
+      vao = calloc(1, sizeof(*vao));
       if (!vao)
          continue; /* Is that all we can do? */
 
       vao->Name = id;
-      vao->HasUserPointer = false;
       _mesa_HashInsertLocked(glthread->VAOs, id, vao);
    }
 }
@@ -139,6 +138,6 @@ _mesa_glthread_AttribPointer(struct gl_context *ctx)
 {
    struct glthread_state *glthread = &ctx->GLThread;
 
-   if (!glthread->vertex_array_is_vbo)
+   if (glthread->CurrentArrayBufferName == 0)
       glthread->CurrentVAO->HasUserPointer = true;
 }