i965: Initial Ivybridge Viewport state setup.

SF and CLIP viewport state has been combined into SF_CLIP_VIEWPORT;
SF_CLIP and CC state pointers can now be uploaded independently.

Some portions of the hardware documentation refer to separate upload
commands for SF and CLIP; these are outdated and incorrect.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>

1 files changed, 106 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/gen7_viewport_state.c b/src/mesa/drivers/dri/i965/gen7_viewport_state.c
new file mode 100644
index 0000000..838ad3a
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/gen7_viewport_state.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  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.
+ */
+
+#include "brw_context.h"
+#include "brw_state.h"
+#include "brw_defines.h"
+#include "intel_batchbuffer.h"
+
+static void
+prepare_sf_clip_viewport(struct brw_context *brw)
+{
+   struct gl_context *ctx = &brw->intel.ctx;
+   const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
+   GLfloat y_scale, y_bias;
+   const GLboolean render_to_fbo = (ctx->DrawBuffer->Name != 0);
+   const GLfloat *v = ctx->Viewport._WindowMap.m;
+   struct gen7_sf_clip_viewport *vp;
+
+   vp = brw_state_batch(brw, sizeof(vp), 64, &brw->sf.vp_offset);
+   /* Also assign to clip.vp_offset in case something uses it. */
+   brw->clip.vp_offset = brw->sf.vp_offset;
+
+   /* Disable guardband clipping (see gen6_viewport_state.c for rationale). */
+   vp->guardband.xmin = -1.0;
+   vp->guardband.xmax = 1.0;
+   vp->guardband.ymin = -1.0;
+   vp->guardband.ymax = 1.0;
+
+   /* _NEW_BUFFERS */
+   if (render_to_fbo) {
+      y_scale = 1.0;
+      y_bias = 0;
+   } else {
+      y_scale = -1.0;
+      y_bias = ctx->DrawBuffer->Height;
+   }
+
+   /* _NEW_VIEWPORT */
+   vp->viewport.m00 = v[MAT_SX];
+   vp->viewport.m11 = v[MAT_SY] * y_scale;
+   vp->viewport.m22 = v[MAT_SZ] * depth_scale;
+   vp->viewport.m30 = v[MAT_TX];
+   vp->viewport.m31 = v[MAT_TY] * y_scale + y_bias;
+   vp->viewport.m32 = v[MAT_TZ] * depth_scale;
+}
+
+static void upload_sf_clip_viewport_state_pointer(struct brw_context *brw)
+{
+   struct intel_context *intel = &brw->intel;
+
+   BEGIN_BATCH(2);
+   OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
+   OUT_BATCH(brw->sf.vp_offset);
+   ADVANCE_BATCH();
+}
+
+const struct brw_tracked_state gen7_sf_clip_viewport = {
+   .dirty = {
+      .mesa = _NEW_VIEWPORT | _NEW_BUFFERS,
+      .brw = BRW_NEW_BATCH,
+      .cache = 0,
+   },
+   .prepare = prepare_sf_clip_viewport,
+   .emit = upload_sf_clip_viewport_state_pointer,
+};
+
+/* ----------------------------------------------------- */
+
+static void upload_cc_viewport_state_pointer(struct brw_context *brw)
+{
+   struct intel_context *intel = &brw->intel;
+
+   BEGIN_BATCH(2);
+   OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_CC << 16 | (2 - 2));
+   OUT_BATCH(brw->cc.vp_offset);
+   ADVANCE_BATCH();
+}
+
+const struct brw_tracked_state gen7_cc_viewport_state_pointer = {
+   .dirty = {
+      .mesa = 0,
+      .brw = BRW_NEW_BATCH,
+      .cache = CACHE_NEW_CC_VP
+   },
+   .emit = upload_cc_viewport_state_pointer,
+};