54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
#pragma once
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#include <stdint.h>
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#include <algorithm>
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#include "../datatypes.cpp"
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#include "../helpers.cpp"
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#include "../buffer.cpp"
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#include "../shaders/shaders.h"
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#include "../mappers/mappers.h"
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namespace UwU {
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// trapezoid (horizontally constrained)
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class Trapezoid {
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public:
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Trapezoid(uint16_t y0, uint16_t y1, uint16_t xl0, uint16_t xl1, uint16_t xr0, uint16_t xr1) {
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this->y0 = y0;
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this->y1 = y1;
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this->xl0 = xl0;
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this->xl1 = xl1;
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this->xr0 = xr0;
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this->xr1 = xr1;
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}
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Trapezoid() {}
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uint16_t y0;
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uint16_t y1;
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uint16_t xl0;
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uint16_t xl1;
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uint16_t xr0;
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uint16_t xr1;
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// Draw a horizontally bounded trapezoid
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// y1 >= y0
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template <class MapperT, class ShaderT>
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void draw (Buffer buffer, MapperBase<MapperT>& mapper, ShaderBase<ShaderT>& shader) {
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uint16_t height = 1 + y1 - y0;
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int16_t LeftBound[height];
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int16_t RightBound[height];
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Helpers::bresenham(0, xl0, y1 - y0, xl1, LeftBound);
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Helpers::bresenham(0, xr0, y1 - y0, xr1, RightBound);
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uint16_t x0 = std::min(xl0, xl1);
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for (uint16_t i = 0; i < height; i++) {
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for (uint16_t x = LeftBound[i]; x <= RightBound[i]; x++) {
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Coord2 uv = mapper.map(x0, y0, x, i + y0);
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buffer.drawPixel(x, i + y0, shader.shade(uv.x, uv.y));
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}
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}
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return;
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}
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};
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} |