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.
---
src/mesa/drivers/common/meta.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index c5c59eb..144fa12 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -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);
+ }
}
--
1.7.6.4
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