On Sat, May 5, 2012 at 9:44 AM, Roland Scheidegger <[email protected]> wrote:
[snip]...
>> + * or the original texture stuff would not work
>> + *
>> + * FIXME: we may use multi-texture to handle this case. But fallback is
>> + * definitely a much simple and straight way.
>> + */
>> + if (ctx->Texture._EnabledUnits)
>> + fallback = GL_TRUE;
>> +
>> if (_mesa_is_color_format(format)) {
>> /* use more compact format when possible */
>> /* XXX disable special case for GL_LUMINANCE for now to work around
>
> Wouldn't you also have to test for active fragment shader too (i.e.
> essentially same test that _mesa_meta_Bitmap is doing I think they might
> have the same prerequisites for fallback for the hilarious combination
> of these ops with ordinary fragment shading)? Though I guess maybe you
> could avoid fallback in some cases (like drawing to stencil buffer then
> texture bound shouldn't matter I think though a fragment shader writing
> to depth or killing fragments still would).
Yes and thanks. And here is the new patch based on your comments:
>From 1e1bacb8cba6ee55b4659613f8a9037b4f54d9c5 Mon Sep 17 00:00:00 2001
From: Yuanhan Liu <[email protected]>
Date: Fri, 4 May 2012 22:23:37 +0800
Subject: [PATCH] meta: do fallback when texture is enabled for DrawPixels
If there are already some texture unit enabled, a fallback is needed,
or the original texture stuff would not work.
A much better way is to use multi-texture to handle this case: like
treat the pixels as texture 1 and the original texture as texture 2.
I haven't do much inverstigation on that way, but fallback is definitely
a much simpler and straight way.
This would fix oglc mipsel test case.
v2: Roland: do fallback also for active fragment shader
no need to fallback for stencil buffer
Signed-off-by: Yuanhan Liu <[email protected]>
---
src/mesa/drivers/common/meta.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index 95336fc..eedc889 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -2206,10 +2206,23 @@ _mesa_meta_DrawPixels(struct gl_context *ctx,
*/
fallback = GL_FALSE;
if (ctx->_ImageTransferState ||
+ ctx->FragmentProgram._Enabled ||
ctx->Fog.Enabled) {
fallback = GL_TRUE;
}
+ /*
+ * If there are already some texture unit enabled, a fallback is needed,
+ * or the original texture stuff would not work
+ *
+ * No need to fallback if drawing to stencil buffer.
+ *
+ * FIXME: we may use multi-texture to handle this case. But fallback is
+ * definitely a much simple and straight way.
+ */
+ if (ctx->Texture._EnabledUnits && !_mesa_is_stencil_format(format))
+ fallback = GL_TRUE;
+
if (_mesa_is_color_format(format)) {
/* use more compact format when possible */
/* XXX disable special case for GL_LUMINANCE for now to work around
--
1.7.3.1
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