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mesa: Save and restore GL_RASTERIZER_DISCARD state during meta ops.

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During meta-operations (such as _mesa_meta_GenerateMipmap()), we need
to be able to draw even if GL_RASTERIZER_DISCARD is enabled.  This
patch causes _mesa_meta_begin() to save the state of
GL_RASTERIZER_DISCARD and disable it (so that drawing can be done
during the meta-op), and causes _mesa_meta_end() to restore it.

Fixes piglit test "EXT_transform_feedback/generatemipmap discard" on
i965 Gen6.

Reviewed-by: Brian Paul <brianp@vmare.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Paul Berry 2011-12-21 10:13:40 -08:00
parent b5b2081d75
commit a3a4d01e41
1 changed files with 7 additions and 0 deletions
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7
src/mesa/drivers/common/meta.c
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@ -180,6 +180,7 @@ struct save_state
/** Miscellaneous (always disabled) */
GLboolean Lighting;
GLboolean RasterDiscard;
};
/**
@ -702,6 +703,9 @@ _mesa_meta_begin(struct gl_context *ctx, GLbitfield state)
save->Lighting = ctx->Light.Enabled;
if (ctx->Light.Enabled)
_mesa_set_enable(ctx, GL_LIGHTING, GL_FALSE);
save->RasterDiscard = ctx->RasterDiscard;
if (ctx->RasterDiscard)
_mesa_set_enable(ctx, GL_RASTERIZER_DISCARD, GL_FALSE);
}
}
@ -981,6 +985,9 @@ _mesa_meta_end(struct gl_context *ctx)
if (save->Lighting) {
_mesa_set_enable(ctx, GL_LIGHTING, GL_TRUE);
}
if (save->RasterDiscard) {
_mesa_set_enable(ctx, GL_RASTERIZER_DISCARD, GL_TRUE);
}
}