mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-10-05 01:49:02 +00:00
169 lines
6.0 KiB
C++
169 lines
6.0 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#include <vtkm/rendering/LineRendererBatcher.h>
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#include <vtkm/worklet/WorkletMapField.h>
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namespace vtkm
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{
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namespace rendering
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{
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namespace
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{
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using ColorsArrayHandle = vtkm::cont::ArrayHandle<vtkm::Vec4f_32>;
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using PointsArrayHandle = vtkm::cont::ArrayHandle<vtkm::Vec3f_32>;
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struct RenderLine : public vtkm::worklet::WorkletMapField
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{
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using ColorBufferType = vtkm::rendering::Canvas::ColorBufferType;
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using DepthBufferType = vtkm::rendering::Canvas::DepthBufferType;
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using ControlSignature = void(FieldIn, FieldIn, FieldIn, WholeArrayInOut, WholeArrayInOut);
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using ExecutionSignature = void(_1, _2, _3, _4, _5);
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using InputDomain = _1;
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VTKM_CONT
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RenderLine() {}
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VTKM_CONT
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RenderLine(vtkm::Id width, vtkm::Id height)
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: Width(width)
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, Height(height)
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{
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}
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template <typename ColorBufferPortal, typename DepthBufferPortal>
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VTKM_EXEC void operator()(const vtkm::Vec3f_32& start,
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const vtkm::Vec3f_32& end,
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const vtkm::Vec4f_32& color,
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ColorBufferPortal& colorBuffer,
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DepthBufferPortal& depthBuffer) const
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{
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vtkm::Id x0 = static_cast<vtkm::Id>(vtkm::Round(start[0]));
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vtkm::Id y0 = static_cast<vtkm::Id>(vtkm::Round(start[1]));
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vtkm::Float32 z0 = static_cast<vtkm::Float32>(start[2]);
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vtkm::Id x1 = static_cast<vtkm::Id>(vtkm::Round(end[0]));
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vtkm::Id y1 = static_cast<vtkm::Id>(vtkm::Round(end[1]));
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vtkm::Float32 z1 = static_cast<vtkm::Float32>(end[2]);
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vtkm::Id dx = vtkm::Abs(x1 - x0), sx = x0 < x1 ? 1 : -1;
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vtkm::Id dy = -vtkm::Abs(y1 - y0), sy = y0 < y1 ? 1 : -1;
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vtkm::Id err = dx + dy, err2 = 0;
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const vtkm::Id xStart = x0;
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const vtkm::Id yStart = y0;
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const vtkm::Float32 pdist = vtkm::Sqrt(vtkm::Float32(dx * dx) + vtkm::Float32(dy * dy));
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while (x0 >= 0 && x0 < this->Width && y0 >= 0 && y0 < this->Height)
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{
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vtkm::Float32 deltaX = static_cast<vtkm::Float32>(x0 - xStart);
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vtkm::Float32 deltaY = static_cast<vtkm::Float32>(y0 - yStart);
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// Depth is wrong, but its far less wrong that it used to be.
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// These depth values are in screen space, which have been
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// potentially tranformed by a perspective correction.
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// To interpolated the depth correctly, there must be a perspective correction.
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// I haven't looked, but the wireframmer probably suffers from this too.
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// Additionally, this should not happen on the CPU. Annotations take
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// far longer than the the geometry.
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vtkm::Float32 t = pdist == 0.f ? 1.0f : vtkm::Sqrt(deltaX * deltaX + deltaY * deltaY) / pdist;
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t = vtkm::Min(1.f, vtkm::Max(0.f, t));
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vtkm::Float32 z = vtkm::Lerp(z0, z1, t);
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vtkm::Id index = y0 * this->Width + x0;
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vtkm::Vec4f_32 currentColor = colorBuffer.Get(index);
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vtkm::Float32 currentZ = depthBuffer.Get(index);
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bool blend = currentColor[3] < 1.f && z > currentZ;
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if (currentZ > z || blend)
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{
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vtkm::Vec4f_32 writeColor = color;
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vtkm::Float32 depth = z;
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if (blend)
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{
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// If there is any transparency, all alphas
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// have been pre-mulitplied
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vtkm::Float32 alpha = (1.f - currentColor[3]);
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writeColor[0] = currentColor[0] + color[0] * alpha;
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writeColor[1] = currentColor[1] + color[1] * alpha;
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writeColor[2] = currentColor[2] + color[2] * alpha;
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writeColor[3] = 1.f * alpha + currentColor[3]; // we are always drawing opaque lines
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// keep the current z. Line z interpolation is not accurate
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// Matt: this is correct. Interpolation is wrong
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depth = currentZ;
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}
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depthBuffer.Set(index, depth);
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colorBuffer.Set(index, writeColor);
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}
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if (x0 == x1 && y0 == y1)
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{
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break;
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}
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err2 = err * 2;
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if (err2 >= dy)
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{
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err += dy;
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x0 += sx;
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}
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if (err2 <= dx)
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{
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err += dx;
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y0 += sy;
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}
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}
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}
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vtkm::Id Width;
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vtkm::Id Height;
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}; // struct RenderLine
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} // namespace
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LineRendererBatcher::LineRendererBatcher() {}
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void LineRendererBatcher::BatchLine(const vtkm::Vec3f_64& start,
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const vtkm::Vec3f_64& end,
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const vtkm::rendering::Color& color)
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{
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vtkm::Vec3f_32 start32(static_cast<vtkm::Float32>(start[0]),
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static_cast<vtkm::Float32>(start[1]),
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static_cast<vtkm::Float32>(start[2]));
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vtkm::Vec3f_32 end32(static_cast<vtkm::Float32>(end[0]),
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static_cast<vtkm::Float32>(end[1]),
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static_cast<vtkm::Float32>(end[2]));
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this->BatchLine(start32, end32, color);
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}
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void LineRendererBatcher::BatchLine(const vtkm::Vec3f_32& start,
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const vtkm::Vec3f_32& end,
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const vtkm::rendering::Color& color)
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{
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this->Starts.push_back(start);
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this->Ends.push_back(end);
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this->Colors.push_back(color.Components);
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}
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void LineRendererBatcher::Render(const vtkm::rendering::Canvas* canvas) const
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{
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PointsArrayHandle starts = vtkm::cont::make_ArrayHandle(this->Starts, vtkm::CopyFlag::Off);
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PointsArrayHandle ends = vtkm::cont::make_ArrayHandle(this->Ends, vtkm::CopyFlag::Off);
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ColorsArrayHandle colors = vtkm::cont::make_ArrayHandle(this->Colors, vtkm::CopyFlag::Off);
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vtkm::cont::Invoker invoker;
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invoker(RenderLine(canvas->GetWidth(), canvas->GetHeight()),
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starts,
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ends,
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colors,
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canvas->GetColorBuffer(),
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canvas->GetDepthBuffer());
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}
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}
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} // namespace vtkm::rendering
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