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[D3D12] Emulate reversed Z in shaders because it's unsupported on Nvidia

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Triang3l
2018-09-26 20:46:24 +03:00
parent 55f96c0f83
commit ea7d9e9060
8 changed files with 215 additions and 152 deletions
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34
src/xenia/gpu/d3d12/d3d12_command_processor.cc
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@@ -1275,6 +1275,11 @@ void D3D12CommandProcessor::UpdateFixedFunctionState(
viewport.Height = viewport_scale_y * 2.0f * float(ssaa_scale_y);
viewport.MinDepth = viewport_offset_z;
viewport.MaxDepth = viewport_offset_z + viewport_scale_z;
if (viewport_scale_z < 0.0f) {
// MinDepth > MaxDepth doesn't work on Nvidia, emulating it in vertex
// shaders and when applying polygon offset.
std::swap(viewport.MinDepth, viewport.MaxDepth);
}
ff_viewport_update_needed_ |= ff_viewport_.TopLeftX != viewport.TopLeftX;
ff_viewport_update_needed_ |= ff_viewport_.TopLeftY != viewport.TopLeftY;
ff_viewport_update_needed_ |= ff_viewport_.Width != viewport.Width;
@@ -1378,21 +1383,20 @@ void D3D12CommandProcessor::UpdateSystemConstantValues(
// W0 division control.
// http://www.x.org/docs/AMD/old/evergreen_3D_registers_v2.pdf
// VTX_XY_FMT = true: the incoming XY have already been multiplied by 1/W0.
// = false: multiply the X, Y coordinates by 1/W0.
// VTX_Z_FMT = true: the incoming Z has already been multiplied by 1/W0.
// = false: multiply the Z coordinate by 1/W0.
// VTX_W0_FMT = true: the incoming W0 is not 1/W0. Perform the reciprocal to
// get 1/W0.
uint32_t vtx_xy_fmt = (pa_cl_vte_cntl >> 8) & 1;
uint32_t vtx_z_fmt = (pa_cl_vte_cntl >> 9) & 1;
uint32_t vtx_w0_fmt = (pa_cl_vte_cntl >> 10) & 1;
dirty |= system_constants_.vertex_w_format[0] != vtx_xy_fmt;
dirty |= system_constants_.vertex_w_format[1] != vtx_z_fmt;
dirty |= system_constants_.vertex_w_format[2] != vtx_w0_fmt;
system_constants_.vertex_w_format[0] = vtx_xy_fmt;
system_constants_.vertex_w_format[1] = vtx_z_fmt;
system_constants_.vertex_w_format[2] = vtx_w0_fmt;
// 8: VTX_XY_FMT = true: the incoming XY have already been multiplied by 1/W0.
// = false: multiply the X, Y coordinates by 1/W0.
// 9: VTX_Z_FMT = true: the incoming Z has already been multiplied by 1/W0.
// = false: multiply the Z coordinate by 1/W0.
// 10: VTX_W0_FMT = true: the incoming W0 is not 1/W0. Perform the reciprocal
// to get 1/W0.
uint32_t ndc_control = (pa_cl_vte_cntl >> 8) & 0x7;
// Reversed depth.
if ((pa_cl_vte_cntl & (1 << 4)) &&
regs[XE_GPU_REG_PA_CL_VPORT_ZSCALE].f32 < 0.0f) {
ndc_control |= 1 << 3;
}
dirty |= system_constants_.ndc_control != ndc_control;
system_constants_.ndc_control = ndc_control;
// Conversion to Direct3D 12 normalized device coordinates.
// See viewport configuration in UpdateFixedFunctionState for explanations.