i965: Add Sandybridge viewport setup.

1 files changed, 175 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/gen6_viewport_state.c b/src/mesa/drivers/dri/i965/gen6_viewport_state.c
new file mode 100644
index 0000000000..13d2fc1b42
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/gen6_viewport_state.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright © 2009 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include "brw_context.h"
+#include "brw_state.h"
+#include "brw_defines.h"
+#include "brw_util.h"
+#include "intel_batchbuffer.h"
+#include "main/macros.h"
+#include "main/enums.h"
+
+/* The clip VP defines the guardband region where expensive clipping is skipped
+ * and fragments are allowed to be generated and clipped out cheaply by the SF.
+ *
+ * By setting it to NDC bounds of [-1,1], we don't do GB clipping.  It's
+ * supposed to cause seams to become visible in apps due to shared edges taking
+ * different clip/no clip paths depending on whether the rest of the prim ends
+ * up in the guardband or not.
+ */
+static void
+prepare_clip_vp(struct brw_context *brw)
+{
+   struct brw_clipper_viewport vp;
+
+   vp.xmin = -1.0;
+   vp.xmax = 1.0;
+   vp.ymin = -1.0;
+   vp.ymax = 1.0;
+
+   drm_intel_bo_unreference(brw->clip.vp_bo);
+   brw->clip.vp_bo = brw_cache_data(&brw->cache, BRW_CLIP_VP,
+				    &vp, sizeof(vp),
+				    NULL, 0);
+}
+
+const struct brw_tracked_state gen6_clip_vp = {
+   .dirty = {
+      .mesa = _NEW_VIEWPORT, /* XXX: not really, but we need nonzero */
+      .brw = 0,
+      .cache = 0,
+   },
+   .prepare = prepare_clip_vp,
+};
+
+static void
+prepare_sf_vp(struct brw_context *brw)
+{
+   GLcontext *ctx = &brw->intel.ctx;
+   const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
+   struct brw_sf_viewport sfv;
+   GLfloat y_scale, y_bias;
+   const GLboolean render_to_fbo = (ctx->DrawBuffer->Name != 0);
+   const GLfloat *v = ctx->Viewport._WindowMap.m;
+
+   memset(&sfv, 0, sizeof(sfv));
+
+   /* _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 */
+   sfv.viewport.m00 = v[MAT_SX];
+   sfv.viewport.m11 = v[MAT_SY] * y_scale;
+   sfv.viewport.m22 = v[MAT_SZ] * depth_scale;
+   sfv.viewport.m30 = v[MAT_TX];
+   sfv.viewport.m31 = v[MAT_TY] * y_scale + y_bias;
+   sfv.viewport.m32 = v[MAT_TZ] * depth_scale;
+
+   drm_intel_bo_unreference(brw->sf.vp_bo);
+   brw->sf.vp_bo = brw_cache_data(&brw->cache, BRW_SF_VP,
+				  &sfv, sizeof(sfv),
+				  NULL, 0);
+}
+
+const struct brw_tracked_state gen6_sf_vp = {
+   .dirty = {
+      .mesa = _NEW_VIEWPORT | _NEW_BUFFERS,
+      .brw = 0,
+      .cache = 0,
+   },
+   .prepare = prepare_sf_vp,
+};
+
+static void
+prepare_cc_vp(struct brw_context *brw)
+{
+   GLcontext *ctx = &brw->intel.ctx;
+   struct brw_cc_viewport ccv;
+
+   /* _NEW_TRANSOFORM */
+   if (ctx->Transform.DepthClamp) {
+      /* _NEW_VIEWPORT */
+      ccv.min_depth = MIN2(ctx->Viewport.Near, ctx->Viewport.Far);
+      ccv.max_depth = MAX2(ctx->Viewport.Near, ctx->Viewport.Far);
+   } else {
+      ccv.min_depth = 0.0;
+      ccv.max_depth = 1.0;
+   }
+
+   drm_intel_bo_unreference(brw->cc.vp_bo);
+   brw->cc.vp_bo = brw_cache_data(&brw->cache, BRW_CC_VP, &ccv, sizeof(ccv),
+				  NULL, 0);
+}
+
+const struct brw_tracked_state gen6_cc_vp = {
+   .dirty = {
+      .mesa = _NEW_VIEWPORT | _NEW_TRANSFORM,
+      .brw = 0,
+      .cache = 0,
+   },
+   .prepare = prepare_cc_vp,
+};
+
+static void prepare_viewport_state_pointers(struct brw_context *brw)
+{
+   brw_add_validated_bo(brw, brw->sf.state_bo);
+}
+
+static void upload_viewport_state_pointers(struct brw_context *brw)
+{
+   struct intel_context *intel = &brw->intel;
+
+   BEGIN_BATCH(4);
+   OUT_BATCH(CMD_VIEWPORT_STATE_POINTERS << 16 | (4 - 2) |
+	     GEN6_CC_VIEWPORT_MODIFY |
+	     GEN6_SF_VIEWPORT_MODIFY |
+	     GEN6_CLIP_VIEWPORT_MODIFY);
+   OUT_RELOC(brw->clip.vp_bo, I915_GEM_DOMAIN_INSTRUCTION, 0, 1);
+   OUT_RELOC(brw->sf.vp_bo, I915_GEM_DOMAIN_INSTRUCTION, 0, 1);
+   OUT_RELOC(brw->cc.vp_bo, I915_GEM_DOMAIN_INSTRUCTION, 0, 1);
+   ADVANCE_BATCH();
+
+   intel_batchbuffer_emit_mi_flush(intel->batch);
+}
+
+const struct brw_tracked_state gen6_viewport_state = {
+   .dirty = {
+      .mesa = 0,
+      .brw = BRW_NEW_BATCH,
+      .cache = (CACHE_NEW_CLIP_VP |
+		CACHE_NEW_SF_VP |
+		CACHE_NEW_CC_VP)
+   },
+   .prepare = prepare_viewport_state_pointers,
+   .emit = upload_viewport_state_pointers,
+};