[Mesa-dev] [PATCH v2 3/9] mesa: Add QueryBuffer to context

[Ian Romanick]

On 03/27/2014 01:59 PM, Rafal Mielniczuk wrote:
> Add QueryBuffer and initialise it to NullBufferObj
> on start
> 
> Signed-off-by: Rafal Mielniczuk <rafal.mielniczuk2 at gmail.com>
> ---
>  src/mesa/main/bufferobj.c | 5 +++++
>  src/mesa/main/mtypes.h    | 2 ++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
> index 2e9e059..8d6e1ee 100644
> --- a/src/mesa/main/bufferobj.c
> +++ b/src/mesa/main/bufferobj.c
> @@ -89,6 +89,8 @@ get_buffer_target(struct gl_context *ctx, GLenum target)
>        return &ctx->CopyReadBuffer;
>     case GL_COPY_WRITE_BUFFER:
>        return &ctx->CopyWriteBuffer;
> +   case GL_QUERY_BUFFER:

This query is only available if the extension is enabled and you're in
desktop OpenGL.  You'll need something like:


      if (_mesa_is_desktop_gl(ctx)
          && ctx->Extensions.ARB_query_buffer_object)
         return &ctx->QueryBuffer;
      break;

> +      return &ctx->QueryBuffer;
>     case GL_DRAW_INDIRECT_BUFFER:
>        if (ctx->API == API_OPENGL_CORE &&
>            ctx->Extensions.ARB_draw_indirect) {
> @@ -835,6 +837,9 @@ _mesa_init_buffer_objects( struct gl_context *ctx )
>     _mesa_reference_buffer_object(ctx, &ctx->DrawIndirectBuffer,
>  				 ctx->Shared->NullBufferObj);
>  
> +   _mesa_reference_buffer_object(ctx, &ctx->QueryBuffer,
> +                                 ctx->Shared->NullBufferObj);
> +
>     for (i = 0; i < MAX_COMBINED_UNIFORM_BUFFERS; i++) {
>        _mesa_reference_buffer_object(ctx,
>  				    &ctx->UniformBufferBindings[i].BufferObject,
> diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
> index 3e3e6fd..ebb581c 100644
> --- a/src/mesa/main/mtypes.h
> +++ b/src/mesa/main/mtypes.h
> @@ -4164,6 +4164,8 @@ struct gl_context
>     struct gl_buffer_object *CopyReadBuffer; /**< GL_ARB_copy_buffer */
>     struct gl_buffer_object *CopyWriteBuffer; /**< GL_ARB_copy_buffer */
>  
> +   struct gl_buffer_object *QueryBuffer; /**< GL_ARB_query_buffer_object */
> +
>     /**
>      * Current GL_ARB_uniform_buffer_object binding referenced by
>      * GL_UNIFORM_BUFFER target for glBufferData, glMapBuffer, etc.
>