[Mesa-dev] [PATCH v2 1/6] mesa: wire up InvalidateFramebuffer

[Brian Paul]

On 12/12/2018 08:48 AM, Rob Clark wrote:
> And before someone actually starts implementing DiscardFramebuffer()
> lets rework the interface to something that is actually usable.
> 
> Signed-off-by: Rob Clark <robdclark at gmail.com>
> Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
> ---
>   src/mesa/main/dd.h       |  5 ++-
>   src/mesa/main/fbobject.c | 77 +++++++++++++++++++++++++++++++++++++---
>   2 files changed, 75 insertions(+), 7 deletions(-)
> 
> diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
> index f14c3e04e91..1214eeaa474 100644
> --- a/src/mesa/main/dd.h
> +++ b/src/mesa/main/dd.h
> @@ -784,9 +784,8 @@ struct dd_function_table {
>                              GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
>                              GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
>                              GLbitfield mask, GLenum filter);
> -   void (*DiscardFramebuffer)(struct gl_context *ctx,
> -                              GLenum target, GLsizei numAttachments,
> -                              const GLenum *attachments);
> +   void (*DiscardFramebuffer)(struct gl_context *ctx, struct gl_framebuffer *fb,
> +                              struct gl_renderbuffer_attachment *att);
>   
>      /**
>       * \name Functions for GL_ARB_sample_locations
> diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
> index 23e49396199..442435655fa 100644
> --- a/src/mesa/main/fbobject.c
> +++ b/src/mesa/main/fbobject.c
> @@ -4637,6 +4637,65 @@ invalid_enum:
>      return;
>   }
>   
> +static struct gl_renderbuffer_attachment *
> +get_fb_attachment(struct gl_context *ctx, struct gl_framebuffer *fb,
> +                  const GLenum attachment)
> +{
> +   int idx;
> +
> +   switch (attachment) {
> +   case GL_COLOR:
> +   case GL_COLOR_ATTACHMENT0:
> +   case GL_COLOR_ATTACHMENT1:
> +   case GL_COLOR_ATTACHMENT2:
> +   case GL_COLOR_ATTACHMENT3:
> +   case GL_COLOR_ATTACHMENT4:
> +   case GL_COLOR_ATTACHMENT5:
> +   case GL_COLOR_ATTACHMENT6:
> +   case GL_COLOR_ATTACHMENT7:
> +   case GL_COLOR_ATTACHMENT8:
> +   case GL_COLOR_ATTACHMENT9:
> +   case GL_COLOR_ATTACHMENT10:
> +   case GL_COLOR_ATTACHMENT11:
> +   case GL_COLOR_ATTACHMENT12:
> +   case GL_COLOR_ATTACHMENT13:
> +   case GL_COLOR_ATTACHMENT14:
> +   case GL_COLOR_ATTACHMENT15:
> +      if (attachment == GL_COLOR) {
> +         idx = 0;
> +      } else {
> +         idx = attachment - GL_COLOR_ATTACHMENT0;
> +      }
> +      return &fb->Attachment[BUFFER_COLOR0 + idx];
> +   case GL_DEPTH:
> +   case GL_DEPTH_ATTACHMENT:
> +   case GL_DEPTH_STENCIL_ATTACHMENT:
> +      return &fb->Attachment[BUFFER_DEPTH];
> +   case GL_STENCIL:
> +   case GL_STENCIL_ATTACHMENT:
> +      return &fb->Attachment[BUFFER_STENCIL];
> +   default:
> +      return NULL;
> +   }
> +}

That function seems pretty similar to get_attachment().  Can you use (or 
modify) that one instead?


> +
> +static void
> +discard_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb,
> +                    GLsizei numAttachments, const GLenum *attachments)

Please put a comment on this new function.


> +{
> +   if (!ctx->Driver.DiscardFramebuffer)
> +      return;
> +
> +   for (int i = 0; i < numAttachments; i++) {
> +      struct gl_renderbuffer_attachment *att =
> +            get_fb_attachment(ctx, fb, attachments[i]);
> +
> +      if (!att)
> +         continue;
> +
> +      ctx->Driver.DiscardFramebuffer(ctx, fb, att);

Or,

if (att) {
    ctx->Driver.DiscardFramebuffer(ctx, fb, att);
}


> +   }
> +}
>   
>   void GLAPIENTRY
>   _mesa_InvalidateSubFramebuffer_no_error(GLenum target, GLsizei numAttachments,
> @@ -4695,14 +4754,23 @@ _mesa_InvalidateNamedFramebufferSubData(GLuint framebuffer,
>      invalidate_framebuffer_storage(ctx, fb, numAttachments, attachments,
>                                     x, y, width, height,
>                                     "glInvalidateNamedFramebufferSubData");
> -}
>   
> +   discard_sub_framebuffer(ctx, fb, numAttachments, attachments,
> +                           x, y, width, height);
> +}
>   
>   void GLAPIENTRY
>   _mesa_InvalidateFramebuffer_no_error(GLenum target, GLsizei numAttachments,
>                                        const GLenum *attachments)
>   {
> -   /* no-op */
> +   struct gl_framebuffer *fb;
> +   GET_CURRENT_CONTEXT(ctx);
> +
> +   fb = get_framebuffer_target(ctx, target);
> +   if (!fb)
> +      return;
> +
> +   discard_framebuffer(ctx, fb, numAttachments, attachments);
>   }
>   
>   
> @@ -4738,6 +4806,8 @@ _mesa_InvalidateFramebuffer(GLenum target, GLsizei numAttachments,
>                                     ctx->Const.MaxViewportWidth,
>                                     ctx->Const.MaxViewportHeight,
>                                     "glInvalidateFramebuffer");
> +
> +   discard_framebuffer(ctx, fb, numAttachments, attachments);
>   }
>   
>   
> @@ -4824,8 +4894,7 @@ _mesa_DiscardFramebufferEXT(GLenum target, GLsizei numAttachments,
>         }
>      }
>   
> -   if (ctx->Driver.DiscardFramebuffer)
> -      ctx->Driver.DiscardFramebuffer(ctx, target, numAttachments, attachments);
> +   discard_framebuffer(ctx, fb, numAttachments, attachments);
>   
>      return;
>   
>