[Mesa-dev] Mesa (shader-work): mesa: add GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB and env var to set it

[Brian Paul]

On 09/13/2010 08:30 PM, Luca Barbieri wrote:
> Module: Mesa
> Branch: shader-work
> Commit: 1c6de307bb73b492274aeba303fb69160df69514
> URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1c6de307bb73b492274aeba303fb69160df69514
>
> Author: Luca Barbieri<luca at luca-barbieri.com>
> Date:   Wed Sep  8 06:24:10 2010 +0200
>
> mesa: add GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB and env var to set it
>
> ARB_robustness specifies it, and we need the bit to choose whether
> to apply some loop optimizations in the GLSL compiler.
>
> Currenly, it is turned on by export MESA_ROBUST_ACCESS=1.
>
> In the future, GLX_ARB_create_context_robustness will allow to turn
> it on in the standard way.
>
> ---
>
>   src/mesa/main/context.c |    5 +++++
>   src/mesa/main/mtypes.h  |    4 ++++
>   2 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
> index 979bc40..f5fe94d 100644
> --- a/src/mesa/main/context.c
> +++ b/src/mesa/main/context.c
> @@ -873,6 +873,11 @@ _mesa_initialize_context_for_api(GLcontext *ctx,
>      ctx->WinSysDrawBuffer = NULL;
>      ctx->WinSysReadBuffer = NULL;
>
> +   /* eventually, GLX_ARB_create_context_robustness will be usable to enable this too */
> +   if (_mesa_getenv("MESA_ROBUST_ACCESS")) {
> +      ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB;
> +   }
> +
>      /* misc one-time initializations */
>      one_time_init(ctx);
>
> diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
> index cabc42b..d66a60f 100644
> --- a/src/mesa/main/mtypes.h
> +++ b/src/mesa/main/mtypes.h
> @@ -3088,6 +3088,10 @@ typedef enum {
>      API_OPENGLES2
>   } gl_api;
>
> +#ifndef GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB
> +#define GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB 0x00000004
> +#endif
> +

This part of the patch should go into glheader.h

-Brian