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i965: add functional changes for AMD_depth_clamp_separate

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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@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Sagar Ghuge 2018-08-21 14:25:17 -07:00 • committed by Anuj Phogat
parent 2765749e0f
commit e6adea0dc0
1 changed files with 16 additions and 6 deletions
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22
src/mesa/drivers/dri/i965/genX_state_upload.c
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@ -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)) {
#if GEN_GEN >= 9
raster.ViewportZFarClipTestEnable = true;
raster.ViewportZNearClipTestEnable = true;
#else
ctx->Transform.DepthClampFar))
raster.ViewportZClipTestEnable = true;
#endif
}
#if GEN_GEN >= 9
if (!ctx->Transform.DepthClampNear)
raster.ViewportZNearClipTestEnable = true;
if (!ctx->Transform.DepthClampFar)
raster.ViewportZFarClipTestEnable = true;
#endif
/* BRW_NEW_CONSERVATIVE_RASTERIZATION */
#if GEN_GEN >= 9