64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
#include "CanvasPixelShader.h"
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#include "Color.h"
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#include "SoftwareCanvasRenderer.h"
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#include "CanvasPortion.h"
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#include "CanvasPixel.h"
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#include "CanvasFragment.h"
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#include "Rasterizer.h"
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CanvasPixelShader::CanvasPixelShader(const SoftwareCanvasRenderer &renderer, CanvasPortion *portion, int chunk_size, int sub_chunk_size, int chunks_x, int chunks_y):
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renderer(renderer), portion(portion), chunk_size(chunk_size), sub_chunk_size(sub_chunk_size), chunks_x(chunks_x), chunks_y(chunks_y)
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{
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}
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void CanvasPixelShader::processParallelUnit(int unit)
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{
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// Locate the chunk we work on
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int prev_sub_chunk_size = chunk_size * 2;
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int chunk_x = unit / chunks_y;
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int chunk_y = unit % chunks_y;
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int base_x = chunk_x * chunk_size;
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int base_y = chunk_y * chunk_size;
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int limit_x = portion->getWidth() - base_x;
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int limit_y = portion->getHeight() - base_y;
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limit_x = (limit_x > chunk_size) ? chunk_size : limit_x;
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limit_y = (limit_y > chunk_size) ? chunk_size : limit_y;
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// Iterate on sub-chunks
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for (int x = 0; x < limit_x; x += sub_chunk_size)
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{
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for (int y = 0; y < limit_y; y += sub_chunk_size)
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{
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if (interrupted)
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{
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return;
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}
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if (sub_chunk_size == chunk_size or x % prev_sub_chunk_size != 0 or y % prev_sub_chunk_size != 0)
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{
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// Resolve the pixel color
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const CanvasPixel &pixel = portion->at(base_x + x, base_y + y);
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int n = pixel.getFragmentCount();
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Color composite = COLOR_BLACK;
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for (int i = 0; i < n; i++)
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{
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const CanvasFragment &fragment = pixel.getFragment(i);
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const Rasterizer &rasterizer = renderer.getRasterizer(fragment.getClient());
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composite.mask(rasterizer.shadeFragment(fragment));
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}
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// Fill the square area
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for (int fx = 0; fx + x < limit_x and fx < sub_chunk_size; fx++)
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{
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for (int fy = 0; fy + y < limit_y and fy < sub_chunk_size; fy++)
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{
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portion->setColor(base_x + x + fx, base_y + y + fy, composite);
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}
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}
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}
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}
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}
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}
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