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[D3D12] Adaptive tessellation of triangle patches

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Triang3l
2018-12-29 20:53:41 +03:00
parent 14476e5453
commit 928e46c8b2
29 changed files with 2181 additions and 1507 deletions
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31
src/xenia/gpu/d3d12/d3d12_command_processor.cc
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@@ -1234,7 +1234,7 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
// Set up primitive topology.
bool indexed = index_buffer_info != nullptr && index_buffer_info->guest_base;
// Adaptive tessellation requires an index buffer, but it contains per-edge
// tessellation factors (as floats) in it instead of control point indices.
// tessellation factors (as floats) instead of control point indices.
bool adaptive_tessellation;
if (primitive_type == PrimitiveType::kTrianglePatch ||
primitive_type == PrimitiveType::kQuadPatch) {
@@ -1250,22 +1250,6 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
// passed to vertex shader registers, especially if patches are drawn with
// an index buffer.
// https://www.slideshare.net/blackdevilvikas/next-generation-graphics-programming-on-xbox-360
// - Discrete: integer partitioning, factors VGT_HOS_MAX_TESS_LEVEL + 1. PC
// tessellation gives a completely different (non-uniform) grid
// for triangles though.
// - Continuous: fractional_even partitioning, factors
// VGT_HOS_MAX_TESS_LEVEL + 1.
// - Adaptive: fractional_even partitioning, edge factors are float values
// in the index buffer clamped to VGT_HOS_MIN_TESS_LEVEL and
// VGT_HOS_MAX_TESS_LEVEL, plus one, inner factor appears to be
// the minimum of the two edge factors (but without adding 1) in
// each direction. This relies on memexport in games heavily for
// generation of the factor buffer, in Halo 3 the buffer is not
// initialized at all before the memexport pass.
// Adaptive partitioning is likely fractional because this presentation,
// though only mentioning the Xbox 360, demonstrates adaptive tessellation
// using fractional partitioning:
// http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.221.4656&rep=rep1&type=pdf
if (tessellation_mode != TessellationMode::kAdaptive) {
XELOGE(
"Tessellation mode %u is not implemented yet, only adaptive is "
@@ -1345,6 +1329,7 @@ bool D3D12CommandProcessor::IssueDraw(PrimitiveType primitive_type,
UpdateSystemConstantValues(
memexport_used, primitive_type,
indexed ? index_buffer_info->endianness : Endian::kUnspecified,
adaptive_tessellation ? (index_buffer_info->guest_base & 0x1FFFFFFC) : 0,
color_mask, pipeline_render_targets);
// Update constant buffers, descriptors and root parameters.
@@ -1897,7 +1882,7 @@ void D3D12CommandProcessor::UpdateFixedFunctionState(
void D3D12CommandProcessor::UpdateSystemConstantValues(
bool shared_memory_is_uav, PrimitiveType primitive_type,
Endian index_endian, uint32_t color_mask,
Endian index_endian, uint32_t edge_factor_base, uint32_t color_mask,
const RenderTargetCache::PipelineRenderTarget render_targets[4]) {
auto& regs = *register_file_;
@@ -2086,9 +2071,13 @@ void D3D12CommandProcessor::UpdateSystemConstantValues(
dirty |= system_constants_.vertex_base_index != vgt_indx_offset;
system_constants_.vertex_base_index = vgt_indx_offset;
// Index buffer endianness.
dirty |= system_constants_.vertex_index_endian != uint32_t(index_endian);
system_constants_.vertex_index_endian = uint32_t(index_endian);
// Index buffer endianness and adaptive tessellation factors.
uint32_t index_endian_and_edge_factors =
uint32_t(index_endian) | edge_factor_base;
dirty |= system_constants_.vertex_index_endian_and_edge_factors !=
index_endian_and_edge_factors;
system_constants_.vertex_index_endian_and_edge_factors =
index_endian_and_edge_factors;
// Conversion to Direct3D 12 normalized device coordinates.
// See viewport configuration in UpdateFixedFunctionState for explanations.