gen6+ uses _mesa_base_format_has_channel() to check for the alpha
channel, while gen4-5 use ctx->DrawBuffer->Visual.alphaBits. By using
_mesa_base_format_has_channel() here we keep the same behavior accross
all gen.
While initially both ways of checking the alpha channel seemed correct
to me, this change also seems to fix fbo-blending-formats piglit test on
gen4.
Signed-off-by: Rafael Antognolli <rafael.antogno...@intel.com>
Reviewed-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_cc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_cc.c
b/src/mesa/drivers/dri/i965/brw_cc.c
index 78d3bc8..339bff5 100644
--- a/src/mesa/drivers/dri/i965/brw_cc.c
+++ b/src/mesa/drivers/dri/i965/brw_cc.c
@@ -34,6 +34,7 @@
#include "brw_state.h"
#include "brw_defines.h"
#include "brw_util.h"
+#include "main/glformats.h"
#include "main/macros.h"
#include "main/stencil.h"
#include "intel_batchbuffer.h"
@@ -126,7 +127,9 @@ static void upload_cc_unit(struct brw_context *brw)
* force the destination alpha to 1.0. This means replacing GL_DST_ALPHA
* with GL_ONE and GL_ONE_MINUS_DST_ALPHA with GL_ZERO.
*/
- if (ctx->DrawBuffer->Visual.alphaBits == 0) {
+ const struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+ if (rb && !_mesa_base_format_has_channel(rb->_BaseFormat,
+ GL_TEXTURE_ALPHA_TYPE)) {
srcRGB = brw_fix_xRGB_alpha(srcRGB);
srcA = brw_fix_xRGB_alpha(srcA);
dstRGB = brw_fix_xRGB_alpha(dstRGB);
--
2.9.4
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