etnaviv: gallium driver for Vivante GPUs

This driver supports a wide range of Vivante IP cores like GC880,
GC1000, GC2000 and GC3000.

Changes from V1 -> V2:
 - added missing files to actually integrate the driver into build system.
 - adapted driver to new renderonly API

Signed-off-by: Christian Gmeiner <[email protected]>
Signed-off-by: Lucas Stach <[email protected]>
Signed-off-by: Philipp Zabel <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Signed-off-by: Russell King <[email protected]>
Signed-off-by: Wladimir J. van der Laan <[email protected]>
Acked-by: Emil Velikov <[email protected]>

1 files changed, 123 insertions, 0 deletions

diff --git a/src/gallium/drivers/etnaviv/etnaviv_zsa.c b/src/gallium/drivers/etnaviv/etnaviv_zsa.c
new file mode 100644
index 00000000000..7caba279b37
--- /dev/null
+++ b/src/gallium/drivers/etnaviv/etnaviv_zsa.c
@@ -0,0 +1,123 @@
+/*
+ * 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_zsa.h"
+
+#include "etnaviv_context.h"
+#include "etnaviv_translate.h"
+#include "util/u_memory.h"
+
+void *
+etna_zsa_state_create(struct pipe_context *pctx,
+                      const struct pipe_depth_stencil_alpha_state *so)
+{
+   struct etna_zsa_state *cs = CALLOC_STRUCT(etna_zsa_state);
+
+   if (!cs)
+      return NULL;
+
+   cs->base = *so;
+
+   /* XXX does stencil[0] / stencil[1] order depend on rs->front_ccw? */
+   bool early_z = true;
+   bool disable_zs =
+      (!so->depth.enabled || so->depth.func == PIPE_FUNC_ALWAYS) &&
+      !so->depth.writemask;
+
+/* Set operations to KEEP if write mask is 0.
+ * When we don't do this, the depth buffer is written for the entire primitive
+ * instead of just where the stencil condition holds (GC600 rev 0x0019, without
+ * feature CORRECT_STENCIL).
+ * Not sure if this is a hardware bug or just a strange edge case. */
+#if 0 /* TODO: It looks like a hardware bug */
+    for(int i=0; i<2; ++i)
+    {
+        if(so->stencil[i].writemask == 0)
+        {
+            so->stencil[i].fail_op = so->stencil[i].zfail_op = so->stencil[i].zpass_op = PIPE_STENCIL_OP_KEEP;
+        }
+    }
+#endif
+
+   /* Determine whether to enable early z reject. Don't enable it when any of
+    * the stencil-modifying functions is used. */
+   if (so->stencil[0].enabled) {
+      if (so->stencil[0].func != PIPE_FUNC_ALWAYS ||
+          (so->stencil[1].enabled && so->stencil[1].func != PIPE_FUNC_ALWAYS))
+         disable_zs = false;
+
+      if (so->stencil[0].fail_op != PIPE_STENCIL_OP_KEEP ||
+          so->stencil[0].zfail_op != PIPE_STENCIL_OP_KEEP ||
+          so->stencil[0].zpass_op != PIPE_STENCIL_OP_KEEP) {
+         disable_zs = early_z = false;
+      } else if (so->stencil[1].enabled) {
+         if (so->stencil[1].fail_op != PIPE_STENCIL_OP_KEEP ||
+             so->stencil[1].zfail_op != PIPE_STENCIL_OP_KEEP ||
+             so->stencil[1].zpass_op != PIPE_STENCIL_OP_KEEP) {
+            disable_zs = early_z = false;
+         }
+      }
+   }
+
+   /* Disable early z reject when no depth test is enabled.
+    * This avoids having to sample depth even though we know it's going to
+    * succeed. */
+   if (so->depth.enabled == false || so->depth.func == PIPE_FUNC_ALWAYS)
+      early_z = false;
+
+   if (DBG_ENABLED(ETNA_DBG_NO_EARLY_Z))
+      early_z = false;
+
+   /* compare funcs have 1 to 1 mapping */
+   cs->PE_DEPTH_CONFIG =
+      VIVS_PE_DEPTH_CONFIG_DEPTH_FUNC(so->depth.enabled ? so->depth.func
+                                                        : PIPE_FUNC_ALWAYS) |
+      COND(so->depth.writemask, VIVS_PE_DEPTH_CONFIG_WRITE_ENABLE) |
+      COND(early_z, VIVS_PE_DEPTH_CONFIG_EARLY_Z) |
+      COND(disable_zs, VIVS_PE_DEPTH_CONFIG_DISABLE_ZS);
+   cs->PE_ALPHA_OP =
+      COND(so->alpha.enabled, VIVS_PE_ALPHA_OP_ALPHA_TEST) |
+      VIVS_PE_ALPHA_OP_ALPHA_FUNC(so->alpha.func) |
+      VIVS_PE_ALPHA_OP_ALPHA_REF(etna_cfloat_to_uint8(so->alpha.ref_value));
+   cs->PE_STENCIL_OP =
+      VIVS_PE_STENCIL_OP_FUNC_FRONT(so->stencil[0].func) |
+      VIVS_PE_STENCIL_OP_FUNC_BACK(so->stencil[1].func) |
+      VIVS_PE_STENCIL_OP_FAIL_FRONT(translate_stencil_op(so->stencil[0].fail_op)) |
+      VIVS_PE_STENCIL_OP_FAIL_BACK(translate_stencil_op(so->stencil[1].fail_op)) |
+      VIVS_PE_STENCIL_OP_DEPTH_FAIL_FRONT(translate_stencil_op(so->stencil[0].zfail_op)) |
+      VIVS_PE_STENCIL_OP_DEPTH_FAIL_BACK(translate_stencil_op(so->stencil[1].zfail_op)) |
+      VIVS_PE_STENCIL_OP_PASS_FRONT(translate_stencil_op(so->stencil[0].zpass_op)) |
+      VIVS_PE_STENCIL_OP_PASS_BACK(translate_stencil_op(so->stencil[1].zpass_op));
+   cs->PE_STENCIL_CONFIG =
+      translate_stencil_mode(so->stencil[0].enabled, so->stencil[1].enabled) |
+      VIVS_PE_STENCIL_CONFIG_MASK_FRONT(so->stencil[0].valuemask) |
+      VIVS_PE_STENCIL_CONFIG_WRITE_MASK_FRONT(so->stencil[0].writemask);
+   /* XXX back masks in VIVS_PE_DEPTH_CONFIG_EXT? */
+   /* XXX VIVS_PE_STENCIL_CONFIG_REF_FRONT comes from pipe_stencil_ref */
+
+   /* XXX does alpha/stencil test affect PE_COLOR_FORMAT_OVERWRITE? */
+   return cs;
+}