Mesa (master): i965: add functional changes for AMD_depth_clamp_separate
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Tue Aug 28 20:56:49 UTC 2018
Module: Mesa
Branch: master
Commit: e6adea0dc063e461cbcac871da21e577a9d4198c
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=e6adea0dc063e461cbcac871da21e577a9d4198c
Author: Sagar Ghuge <sagar.ghuge at intel.com>
Date: Tue Aug 21 14:25:17 2018 -0700
i965: add functional changes for AMD_depth_clamp_separate
Gen >= 9 have ability to control clamping of depth values separately at
near and far plane.
z_w is clamped to the range [min(n,f), 0] if clamping at near plane is
enabled, [0, max(n,f)] if clamping at far plane is enabled and [min(n,f)
max(n,f)] if clamping at both plane is enabled.
v2: 1) Use better coding style (Ian Romanick)
Signed-off-by: Sagar Ghuge <sagar.ghuge at intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
---
src/mesa/drivers/dri/i965/genX_state_upload.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/genX_state_upload.c b/src/mesa/drivers/dri/i965/genX_state_upload.c
index 24977a7bba..09a42e44b0 100644
--- a/src/mesa/drivers/dri/i965/genX_state_upload.c
+++ b/src/mesa/drivers/dri/i965/genX_state_upload.c
@@ -2343,6 +2343,12 @@ genX(upload_cc_viewport)(struct brw_context *brw)
if (ctx->Transform.DepthClampNear && ctx->Transform.DepthClampFar) {
ccv.MinimumDepth = MIN2(vp->Near, vp->Far);
ccv.MaximumDepth = MAX2(vp->Near, vp->Far);
+ } else if (ctx->Transform.DepthClampNear) {
+ ccv.MinimumDepth = MIN2(vp->Near, vp->Far);
+ ccv.MaximumDepth = 0.0;
+ } else if (ctx->Transform.DepthClampFar) {
+ ccv.MinimumDepth = 0.0;
+ ccv.MaximumDepth = MAX2(vp->Near, vp->Far);
} else {
ccv.MinimumDepth = 0.0;
ccv.MaximumDepth = 1.0;
@@ -4607,15 +4613,19 @@ genX(upload_raster)(struct brw_context *brw)
raster.ScissorRectangleEnable = ctx->Scissor.EnableFlags;
/* _NEW_TRANSFORM */
+#if GEN_GEN < 9
if (!(ctx->Transform.DepthClampNear &&
- ctx->Transform.DepthClampFar)) {
+ ctx->Transform.DepthClampFar))
+ raster.ViewportZClipTestEnable = true;
+#endif
+
#if GEN_GEN >= 9
- raster.ViewportZFarClipTestEnable = true;
+ if (!ctx->Transform.DepthClampNear)
raster.ViewportZNearClipTestEnable = true;
-#else
- raster.ViewportZClipTestEnable = true;
+
+ if (!ctx->Transform.DepthClampFar)
+ raster.ViewportZFarClipTestEnable = true;
#endif
- }
/* BRW_NEW_CONSERVATIVE_RASTERIZATION */
#if GEN_GEN >= 9
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