1 files changed, 109 insertions, 0 deletions
diff --git a/src/gallium/drivers/etnaviv/etnaviv_blend.c b/src/gallium/drivers/etnaviv/etnaviv_blend.c
new file mode 100644
index 00000000000..ebef75daa7a
--- /dev/null
+++ b/src/gallium/drivers/etnaviv/etnaviv_blend.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2012-2015 Etnaviv Project
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Wladimir J. van der Laan <[email protected]>
+ */
+
+#include "etnaviv_blend.h"
+
+#include "etnaviv_context.h"
+#include "etnaviv_translate.h"
+#include "pipe/p_defines.h"
+#include "util/u_memory.h"
+
+void *
+etna_blend_state_create(struct pipe_context *pctx,
+                        const struct pipe_blend_state *so)
+{
+   const struct pipe_rt_blend_state *rt0 = &so->rt[0];
+   struct etna_blend_state *co = CALLOC_STRUCT(etna_blend_state);
+
+   if (!co)
+      return NULL;
+
+   co->base = *so;
+
+   /* Enable blending if
+    * - blend enabled in blend state
+    * - NOT source factor is ONE and destination factor ZERO for both rgb and
+    *   alpha (which would mean that blending is effectively disabled)
+    */
+   bool enable = rt0->blend_enable &&
+                 !(rt0->rgb_src_factor == PIPE_BLENDFACTOR_ONE &&
+                   rt0->rgb_dst_factor == PIPE_BLENDFACTOR_ZERO &&
+                   rt0->alpha_src_factor == PIPE_BLENDFACTOR_ONE &&
+                   rt0->alpha_dst_factor == PIPE_BLENDFACTOR_ZERO);
+
+   /* Enable separate alpha if
+    * - Blending enabled (see above)
+    * - NOT source factor is equal to destination factor for both rgb abd
+    *   alpha (which would effectively that mean alpha is not separate)
+    */
+   bool separate_alpha = enable &&
+                         !(rt0->rgb_src_factor == rt0->alpha_src_factor &&
+                           rt0->rgb_dst_factor == rt0->alpha_dst_factor);
+
+   /* If the complete render target is written, set full_overwrite:
+    * - The color mask is 1111
+    * - No blending is used
+    */
+   bool full_overwrite = (rt0->colormask == 15) && !enable;
+
+   if (enable) {
+      co->PE_ALPHA_CONFIG =
+         VIVS_PE_ALPHA_CONFIG_BLEND_ENABLE_COLOR |
+         COND(separate_alpha, VIVS_PE_ALPHA_CONFIG_BLEND_SEPARATE_ALPHA) |
+         VIVS_PE_ALPHA_CONFIG_SRC_FUNC_COLOR(translate_blend_factor(rt0->rgb_src_factor)) |
+         VIVS_PE_ALPHA_CONFIG_SRC_FUNC_ALPHA(translate_blend_factor(rt0->alpha_src_factor)) |
+         VIVS_PE_ALPHA_CONFIG_DST_FUNC_COLOR(translate_blend_factor(rt0->rgb_dst_factor)) |
+         VIVS_PE_ALPHA_CONFIG_DST_FUNC_ALPHA(translate_blend_factor(rt0->alpha_dst_factor)) |
+         VIVS_PE_ALPHA_CONFIG_EQ_COLOR(translate_blend(rt0->rgb_func)) |
+         VIVS_PE_ALPHA_CONFIG_EQ_ALPHA(translate_blend(rt0->alpha_func));
+   } else {
+      co->PE_ALPHA_CONFIG = 0;
+   }
+
+   co->PE_COLOR_FORMAT =
+         VIVS_PE_COLOR_FORMAT_COMPONENTS(rt0->colormask) |
+         COND(full_overwrite, VIVS_PE_COLOR_FORMAT_OVERWRITE);
+
+   co->PE_LOGIC_OP =
+         VIVS_PE_LOGIC_OP_OP(so->logicop_enable ? so->logicop_func : LOGIC_OP_COPY) |
+         0x000E4000 /* ??? */;
+
+   /* independent_blend_enable not needed: only one rt supported */
+   /* XXX alpha_to_coverage / alpha_to_one? */
+   /* Set dither registers based on dither status. These registers set the
+    * dither pattern,
+    * for now, set the same values as the blob.
+    */
+   if (so->dither) {
+      co->PE_DITHER[0] = 0x6e4ca280;
+      co->PE_DITHER[1] = 0x5d7f91b3;
+   } else {
+      co->PE_DITHER[0] = 0xffffffff;
+      co->PE_DITHER[1] = 0xffffffff;
+   }
+
+   return co;
+}