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i965/msaa: Set KILL_ENABLE when GL_ALPHA_TO_COVERAGE enabled.

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i965 hardware needs to be informed of situations in which it's
possible for pixels (or samples) to be discarded for reasons other
than depth/stencil testing (e.g. due to an explicit "discard" in the
fragment shader).  One of these situations is when
GL_ALPHA_TO_COVERAGE is enabled, since that can cause samples to be
discarded by the color calculator when the pixel's alpha value is less
than 1.0.

Without this patch, GL_ALPHA_TO_COVERAGE does not take effect on depth
buffers.

Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
This commit is contained in:
Paul Berry
2012-06-25 16:57:10 -07:00
parent bc53e14d98
commit 6c355cca91
2 changed files with 6 additions and 4 deletions
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src/mesa/drivers/dri/i965/gen6_wm_state.c
+3 -2
View File
@@ -186,8 +186,9 @@ upload_wm_state(struct brw_context *brw)
dw6 |= brw->wm.prog_data->barycentric_interp_modes <<
GEN6_WM_BARYCENTRIC_INTERPOLATION_MODE_SHIFT;
/* _NEW_COLOR */
if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
/* _NEW_COLOR, _NEW_MULTISAMPLE */
if (fp->program.UsesKill || ctx->Color.AlphaEnabled ||
ctx->Multisample.SampleAlphaToCoverage)
dw5 |= GEN6_WM_KILL_ENABLE;
if (brw_color_buffer_write_enabled(brw) ||
src/mesa/drivers/dri/i965/gen7_wm_state.c
+3 -2
View File
@@ -70,8 +70,9 @@ upload_wm_state(struct brw_context *brw)
dw1 |= brw->wm.prog_data->barycentric_interp_modes <<
GEN7_WM_BARYCENTRIC_INTERPOLATION_MODE_SHIFT;
/* _NEW_COLOR */
if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
/* _NEW_COLOR, _NEW_MULTISAMPLE */
if (fp->program.UsesKill || ctx->Color.AlphaEnabled ||
ctx->Multisample.SampleAlphaToCoverage)
dw1 |= GEN7_WM_KILL_ENABLE;
/* _NEW_BUFFERS */