From: Marek Olšák <maraeo@gmail.com>
Date: Mon, 14 Dec 2009 04:29:12 +0000 (+0100)
Subject: r300g: if no colorbuffers are set, disable blending and set the color mask to 0
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a6d701d1c6ed8e0a649d62104aeded8fb25c66d8;p=mesa.git

r300g: if no colorbuffers are set, disable blending and set the color mask to 0

This seems to be the only way to disable the first colorbuffer.
---

diff --git a/src/gallium/drivers/r300/r300_emit.c b/src/gallium/drivers/r300/r300_emit.c
index 9644efb7174..55e4f94afe2 100644
--- a/src/gallium/drivers/r300/r300_emit.c
+++ b/src/gallium/drivers/r300/r300_emit.c
@@ -41,9 +41,16 @@ void r300_emit_blend_state(struct r300_context* r300,
     CS_LOCALS(r300);
     BEGIN_CS(8);
     OUT_CS_REG_SEQ(R300_RB3D_CBLEND, 3);
-    OUT_CS(blend->blend_control);
-    OUT_CS(blend->alpha_blend_control);
-    OUT_CS(blend->color_channel_mask);
+    if (r300->framebuffer_state.nr_cbufs) {
+        OUT_CS(blend->blend_control);
+        OUT_CS(blend->alpha_blend_control);
+        OUT_CS(blend->color_channel_mask);
+    } else {
+        OUT_CS(0);
+        OUT_CS(0);
+        OUT_CS(0);
+        /* XXX also disable fastfill here once it's supported */
+    }
     OUT_CS_REG(R300_RB3D_ROPCNTL, blend->rop);
     OUT_CS_REG(R300_RB3D_DITHER_CTL, blend->dither);
     END_CS;
diff --git a/src/gallium/drivers/r300/r300_state.c b/src/gallium/drivers/r300/r300_state.c
index 3cfa2e63f90..91cf972edee 100644
--- a/src/gallium/drivers/r300/r300_state.c
+++ b/src/gallium/drivers/r300/r300_state.c
@@ -339,6 +339,7 @@ static void
         r300->dirty_state |= R300_NEW_SCISSOR;
     }
     r300->dirty_state |= R300_NEW_FRAMEBUFFERS;
+    r300->dirty_state |= R300_NEW_BLEND;
 }
 
 /* Create fragment shader state. */