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public static void draw_shaded_triangle(int y_a, int y_b, int y_c, int x_a, int x_b, int x_c, int colour_a,
			int colour_b, int colour_c, float z_a, float z_b, float z_c, int bufferOffset) {
		if (z_a < 0 || z_b < 0 || z_c < 0) {
			return;
		}
 
		/*
		 * y_a = lineOffsets[y_a]; --y_b >= 0; y_a += viewport_width) {
		 */
 
		int rgb_a = hsl2rgb[colour_a];
		int rgb_b = hsl2rgb[colour_b];
		int rgb_c = hsl2rgb[colour_c];
		int red_a = rgb_a >> 16 & 0xff;
		int green_a = rgb_a >> 8 & 0xff;
		int blue_a = rgb_a & 0xff;
		int red_b = rgb_b >> 16 & 0xff;
		int green_b = rgb_b >> 8 & 0xff;
		int blue_b = rgb_b & 0xff;
		int red_c = rgb_c >> 16 & 0xff;
		int green_c = rgb_c >> 8 & 0xff;
		int blue_c = rgb_c & 0xff;
		int a_to_b = 0;
		int red_ba_slope = 0;
		int green_ba_slope = 0;
		int blue_ba_slope = 0;
		if (y_b != y_a) {
			a_to_b = (x_b - x_a << 16) / (y_b - y_a);
			red_ba_slope = (red_b - red_a << 16) / (y_b - y_a);
			green_ba_slope = (green_b - green_a << 16) / (y_b - y_a);
			blue_ba_slope = (blue_b - blue_a << 16) / (y_b - y_a);
		}
		int b_to_c = 0;
		int cb_red_slope = 0;
		int cb_green_slope = 0;
		int cb_blue_slope = 0;
		if (y_c != y_b) {
			b_to_c = (x_c - x_b << 16) / (y_c - y_b);
			cb_red_slope = (red_c - red_b << 16) / (y_c - y_b);
			cb_green_slope = (green_c - green_b << 16) / (y_c - y_b);
			cb_blue_slope = (blue_c - blue_b << 16) / (y_c - y_b);
		}
		int c_to_a = 0;
		int ca_red_slope = 0;
		int ca_green_slope = 0;
		int ca_blue_slope = 0;
		if (y_c != y_a) {
			c_to_a = (x_a - x_c << 16) / (y_a - y_c);
			ca_red_slope = (red_a - red_c << 16) / (y_a - y_c);
			ca_green_slope = (green_a - green_c << 16) / (y_a - y_c);
			ca_blue_slope = (blue_a - blue_c << 16) / (y_a - y_c);
		}
		float x_ba = x_b - x_a;
		float y_ba = y_b - y_a;
		float x_ca = x_c - x_a;
		float y_ca = y_c - y_a;
		float z_ba = z_b - z_a;
		float z_ca = z_c - z_a;
		float length = x_ba * y_ca - x_ca * y_ba;
		if (length == 0.0F) {
			return;
		}
		float z_ba_slope = (z_ba * y_ca - z_ca * y_ba) / length;
		float z_ca_slope = (z_ca * x_ba - z_ba * x_ca) / length;
		if (y_a <= y_b && y_a <= y_c) {
			if (y_a >= clip_bottom) {
				return;
			}
			if (y_b > clip_bottom) {
				y_b = clip_bottom;
			}
			if (y_c > clip_bottom) {
				y_c = clip_bottom;
			}
			z_a = z_a - z_ba_slope * x_a + z_ba_slope;
			if (y_b < y_c) {
				x_c = x_a <<= 16;
				red_c = red_a <<= 16;
				green_c = green_a <<= 16;
				blue_c = blue_a <<= 16;
				if (y_a < 0) {
					x_c -= c_to_a * y_a;
					x_a -= a_to_b * y_a;
					red_c -= ca_red_slope * y_a;
					green_c -= ca_green_slope * y_a;
					blue_c -= ca_blue_slope * y_a;
					red_a -= red_ba_slope * y_a;
					green_a -= green_ba_slope * y_a;
					blue_a -= blue_ba_slope * y_a;
					z_a -= z_ca_slope * y_a;
					y_a = 0;
				}
				x_b <<= 16;
				red_b <<= 16;
				green_b <<= 16;
				blue_b <<= 16;
				if (y_b < 0) {
					x_b -= b_to_c * y_b;
					red_b -= cb_red_slope * y_b;
					green_b -= cb_green_slope * y_b;
					blue_b -= cb_blue_slope * y_b;
					y_b = 0;
				}
				if (y_a != y_b && c_to_a < a_to_b || y_a == y_b && c_to_a > b_to_c) {
					y_c -= y_b;
					y_b -= y_a;
					for (y_a = lineOffsets[y_a]; --y_b >= 0; y_a += viewport_width) {
						draw_shaded_scanline(colour_buffer, y_a, x_c >> 16, x_a >> 16, red_c, green_c, blue_c, red_a,
								green_a, blue_a, z_a, z_ba_slope, bufferOffset);
						x_c += c_to_a;
						x_a += a_to_b;
						red_c += ca_red_slope;
						green_c += ca_green_slope;
						blue_c += ca_blue_slope;
						red_a += red_ba_slope;
						green_a += green_ba_slope;
						blue_a += blue_ba_slope;
						z_a += z_ca_slope;
					}
					while (--y_c >= 0) {
						draw_shaded_scanline(colour_buffer, y_a, x_c >> 16, x_b >> 16, red_c, green_c, blue_c, red_b,
								green_b, blue_b, z_a, z_ba_slope, bufferOffset);
						x_c += c_to_a;
						x_b += b_to_c;
						red_c += ca_red_slope;
						green_c += ca_green_slope;
						blue_c += ca_blue_slope;
						red_b += cb_red_slope;
						green_b += cb_green_slope;
						blue_b += cb_blue_slope;
						y_a += viewport_width;
						z_a += z_ca_slope;
					}
					return;
				}
				y_c -= y_b;
				y_b -= y_a;
				for (y_a = lineOffsets[y_a]; --y_b >= 0; y_a += viewport_width) {
					draw_shaded_scanline(colour_buffer, y_a, x_a >> 16, x_c >> 16, red_a, green_a, blue_a, red_c,
							green_c, blue_c, z_a, z_ba_slope, bufferOffset);
					x_c += c_to_a;
					x_a += a_to_b;
					red_c += ca_red_slope;
					green_c += ca_green_slope;
					blue_c += ca_blue_slope;
					red_a += red_ba_slope;
					green_a += green_ba_slope;
					blue_a += blue_ba_slope;
					z_a += z_ca_slope;
				}
				while (--y_c >= 0) {
					draw_shaded_scanline(colour_buffer, y_a, x_b >> 16, x_c >> 16, red_b, green_b, blue_b, red_c,
							green_c, blue_c, z_a, z_ba_slope, bufferOffset);
					x_c += c_to_a;
					x_b += b_to_c;
					red_c += ca_red_slope;
					green_c += ca_green_slope;
					blue_c += ca_blue_slope;
					red_b += cb_red_slope;
					green_b += cb_green_slope;
					blue_b += cb_blue_slope;
					y_a += viewport_width;
					z_a += z_ca_slope;
				}
				return;
			}
			x_b = x_a <<= 16;
			red_b = red_a <<= 16;
			green_b = green_a <<= 16;
			blue_b = blue_a <<= 16;
			if (y_a < 0) {
				x_b -= c_to_a * y_a;
				x_a -= a_to_b * y_a;
				red_b -= ca_red_slope * y_a;
				green_b -= ca_green_slope * y_a;
				blue_b -= ca_blue_slope * y_a;
				red_a -= red_ba_slope * y_a;
				green_a -= green_ba_slope * y_a;
				blue_a -= blue_ba_slope * y_a;
				z_a -= z_ca_slope * y_a;
				y_a = 0;
			}
			x_c <<= 16;
			red_c <<= 16;
			green_c <<= 16;
			blue_c <<= 16;
			if (y_c < 0) {
				x_c -= b_to_c * y_c;
				red_c -= cb_red_slope * y_c;
				green_c -= cb_green_slope * y_c;
				blue_c -= cb_blue_slope * y_c;
				y_c = 0;
			}
			if (y_a != y_c && c_to_a < a_to_b || y_a == y_c && b_to_c > a_to_b) {
				y_b -= y_c;
				y_c -= y_a;
				for (y_a = lineOffsets[y_a]; --y_c >= 0; y_a += viewport_width) {
					draw_shaded_scanline(colour_buffer, y_a, x_b >> 16, x_a >> 16, red_b, green_b, blue_b, red_a,
							green_a, blue_a, z_a, z_ba_slope, bufferOffset);
					x_b += c_to_a;
					x_a += a_to_b;
					red_b += ca_red_slope;
					green_b += ca_green_slope;
					blue_b += ca_blue_slope;
					red_a += red_ba_slope;
					green_a += green_ba_slope;
					blue_a += blue_ba_slope;
					z_a += z_ca_slope;
				}
				while (--y_b >= 0) {
					draw_shaded_scanline(colour_buffer, y_a, x_c >> 16, x_a >> 16, red_c, green_c, blue_c, red_a,
							green_a, blue_a, z_a, z_ba_slope, bufferOffset);
					x_c += b_to_c;
					x_a += a_to_b;
					red_c += cb_red_slope;
					green_c += cb_green_slope;
					blue_c += cb_blue_slope;
					red_a += red_ba_slope;
					green_a += green_ba_slope;
					blue_a += blue_ba_slope;
					y_a += viewport_width;
					z_a += z_ca_slope;
				}
				return;
			}
			y_b -= y_c;
			y_c -= y_a;
			for (y_a = lineOffsets[y_a]; --y_c >= 0; y_a += viewport_width) {
				draw_shaded_scanline(colour_buffer, y_a, x_a >> 16, x_b >> 16, red_a, green_a, blue_a, red_b, green_b,
						blue_b, z_a, z_ba_slope, bufferOffset);
				x_b += c_to_a;
				x_a += a_to_b;
				red_b += ca_red_slope;
				green_b += ca_green_slope;
				blue_b += ca_blue_slope;
				red_a += red_ba_slope;
				green_a += green_ba_slope;
				blue_a += blue_ba_slope;
				z_a += z_ca_slope;
			}
			while (--y_b >= 0) {
				draw_shaded_scanline(colour_buffer, y_a, x_a >> 16, x_c >> 16, red_a, green_a, blue_a, red_c, green_c,
						blue_c, z_a, z_ba_slope, bufferOffset);
				x_c += b_to_c;
				x_a += a_to_b;
				red_c += cb_red_slope;
				green_c += cb_green_slope;
				blue_c += cb_blue_slope;
				red_a += red_ba_slope;
				green_a += green_ba_slope;
				blue_a += blue_ba_slope;
				y_a += viewport_width;
				z_a += z_ca_slope;
			}
			return;
		}
		if (y_b <= y_c) {
			if (y_b >= clip_bottom) {
				return;
			}
			if (y_c > clip_bottom) {
				y_c = clip_bottom;
			}
			if (y_a > clip_bottom) {
				y_a = clip_bottom;
			}
			z_b = z_b - z_ba_slope * x_b + z_ba_slope;
			if (y_c < y_a) {
				x_a = x_b <<= 16;
				red_a = red_b <<= 16;
				green_a = green_b <<= 16;
				blue_a = blue_b <<= 16;
				if (y_b < 0) {
					x_a -= a_to_b * y_b;
					x_b -= b_to_c * y_b;
					red_a -= red_ba_slope * y_b;
					green_a -= green_ba_slope * y_b;
					blue_a -= blue_ba_slope * y_b;
					red_b -= cb_red_slope * y_b;
					green_b -= cb_green_slope * y_b;
					blue_b -= cb_blue_slope * y_b;
					z_b -= z_ca_slope * y_b;
					y_b = 0;
				}
				x_c <<= 16;
				red_c <<= 16;
				green_c <<= 16;
				blue_c <<= 16;
				if (y_c < 0) {
					x_c -= c_to_a * y_c;
					red_c -= ca_red_slope * y_c;
					green_c -= ca_green_slope * y_c;
					blue_c -= ca_blue_slope * y_c;
					y_c = 0;
				}
				if (y_b != y_c && a_to_b < b_to_c || y_b == y_c && a_to_b > c_to_a) {
					y_a -= y_c;
					y_c -= y_b;
					for (y_b = lineOffsets[y_b]; --y_c >= 0; y_b += viewport_width) {
						draw_shaded_scanline(colour_buffer, y_b, x_a >> 16, x_b >> 16, red_a, green_a, blue_a, red_b,
								green_b, blue_b, z_b, z_ba_slope, bufferOffset);
						x_a += a_to_b;
						x_b += b_to_c;
						red_a += red_ba_slope;
						green_a += green_ba_slope;
						blue_a += blue_ba_slope;
						red_b += cb_red_slope;
						green_b += cb_green_slope;
						blue_b += cb_blue_slope;
						z_b += z_ca_slope;
					}
					while (--y_a >= 0) {
						draw_shaded_scanline(colour_buffer, y_b, x_a >> 16, x_c >> 16, red_a, green_a, blue_a, red_c,
								green_c, blue_c, z_b, z_ba_slope, bufferOffset);
						x_a += a_to_b;
						x_c += c_to_a;
						red_a += red_ba_slope;
						green_a += green_ba_slope;
						blue_a += blue_ba_slope;
						red_c += ca_red_slope;
						green_c += ca_green_slope;
						blue_c += ca_blue_slope;
						y_b += viewport_width;
						z_b += z_ca_slope;
					}
					return;
				}
				y_a -= y_c;
				y_c -= y_b;
				for (y_b = lineOffsets[y_b]; --y_c >= 0; y_b += viewport_width) {
					draw_shaded_scanline(colour_buffer, y_b, x_b >> 16, x_a >> 16, red_b, green_b, blue_b, red_a,
							green_a, blue_a, z_b, z_ba_slope, bufferOffset);
					x_a += a_to_b;
					x_b += b_to_c;
					red_a += red_ba_slope;
					green_a += green_ba_slope;
					blue_a += blue_ba_slope;
					red_b += cb_red_slope;
					green_b += cb_green_slope;
					blue_b += cb_blue_slope;
					z_b += z_ca_slope;
				}
				while (--y_a >= 0) {
					draw_shaded_scanline(colour_buffer, y_b, x_c >> 16, x_a >> 16, red_c, green_c, blue_c, red_a,
							green_a, blue_a, z_b, z_ba_slope, bufferOffset);
					x_a += a_to_b;
					x_c += c_to_a;
					red_a += red_ba_slope;
					green_a += green_ba_slope;
					blue_a += blue_ba_slope;
					red_c += ca_red_slope;
					green_c += ca_green_slope;
					blue_c += ca_blue_slope;
					y_b += viewport_width;
					z_b += z_ca_slope;
				}
				return;
			}
			x_c = x_b <<= 16;
			red_c = red_b <<= 16;
			green_c = green_b <<= 16;
			blue_c = blue_b <<= 16;
			if (y_b < 0) {
				x_c -= a_to_b * y_b;
				x_b -= b_to_c * y_b;
				red_c -= red_ba_slope * y_b;
				green_c -= green_ba_slope * y_b;
				blue_c -= blue_ba_slope * y_b;
				red_b -= cb_red_slope * y_b;
				green_b -= cb_green_slope * y_b;
				blue_b -= cb_blue_slope * y_b;
				z_b -= z_ca_slope * y_b;
				y_b = 0;
			}
			x_a <<= 16;
			red_a <<= 16;
			green_a <<= 16;
			blue_a <<= 16;
			if (y_a < 0) {
				x_a -= c_to_a * y_a;
				red_a -= ca_red_slope * y_a;
				green_a -= ca_green_slope * y_a;
				blue_a -= ca_blue_slope * y_a;
				y_a = 0;
			}
			if (a_to_b < b_to_c) {
				y_c -= y_a;
				y_a -= y_b;
				for (y_b = lineOffsets[y_b]; --y_a >= 0; y_b += viewport_width) {
					draw_shaded_scanline(colour_buffer, y_b, x_c >> 16, x_b >> 16, red_c, green_c, blue_c, red_b,
							green_b, blue_b, z_b, z_ba_slope, bufferOffset);
					x_c += a_to_b;
					x_b += b_to_c;
					red_c += red_ba_slope;
					green_c += green_ba_slope;
					blue_c += blue_ba_slope;
					red_b += cb_red_slope;
					green_b += cb_green_slope;
					blue_b += cb_blue_slope;
					z_b += z_ca_slope;
				}
				while (--y_c >= 0) {
					draw_shaded_scanline(colour_buffer, y_b, x_a >> 16, x_b >> 16, red_a, green_a, blue_a, red_b,
							green_b, blue_b, z_b, z_ba_slope, bufferOffset);
					x_a += c_to_a;
					x_b += b_to_c;
					red_a += ca_red_slope;
					green_a += ca_green_slope;
					blue_a += ca_blue_slope;
					red_b += cb_red_slope;
					green_b += cb_green_slope;
					blue_b += cb_blue_slope;
					y_b += viewport_width;
					z_b += z_ca_slope;
				}
				return;
			}
			y_c -= y_a;
			y_a -= y_b;
			for (y_b = lineOffsets[y_b]; --y_a >= 0; y_b += viewport_width) {
				draw_shaded_scanline(colour_buffer, y_b, x_b >> 16, x_c >> 16, red_b, green_b, blue_b, red_c, green_c,
						blue_c, z_b, z_ba_slope, bufferOffset);
				x_c += a_to_b;
				x_b += b_to_c;
				red_c += red_ba_slope;
				green_c += green_ba_slope;
				blue_c += blue_ba_slope;
				red_b += cb_red_slope;
				green_b += cb_green_slope;
				blue_b += cb_blue_slope;
				z_b += z_ca_slope;
			}
			while (--y_c >= 0) {
				draw_shaded_scanline(colour_buffer, y_b, x_b >> 16, x_a >> 16, red_b, green_b, blue_b, red_a, green_a,
						blue_a, z_b, z_ba_slope, bufferOffset);
				x_a += c_to_a;
				x_b += b_to_c;
				red_a += ca_red_slope;
				green_a += ca_green_slope;
				blue_a += ca_blue_slope;
				red_b += cb_red_slope;
				green_b += cb_green_slope;
				blue_b += cb_blue_slope;
				y_b += viewport_width;
				z_b += z_ca_slope;
			}
			return;
		}
		if (y_c >= clip_bottom) {
			return;
		}
		if (y_a > clip_bottom) {
			y_a = clip_bottom;
		}
		if (y_b > clip_bottom) {
			y_b = clip_bottom;
		}
		z_c = z_c - z_ba_slope * x_c + z_ba_slope;
		if (y_a < y_b) {
			x_b = x_c <<= 16;
			red_b = red_c <<= 16;
			green_b = green_c <<= 16;
			blue_b = blue_c <<= 16;
			if (y_c < 0) {
				x_b -= b_to_c * y_c;
				x_c -= c_to_a * y_c;
				red_b -= cb_red_slope * y_c;
				green_b -= cb_green_slope * y_c;
				blue_b -= cb_blue_slope * y_c;
				red_c -= ca_red_slope * y_c;
				green_c -= ca_green_slope * y_c;
				blue_c -= ca_blue_slope * y_c;
				z_c -= z_ca_slope * y_c;
				y_c = 0;
			}
			x_a <<= 16;
			red_a <<= 16;
			green_a <<= 16;
			blue_a <<= 16;
			if (y_a < 0) {
				x_a -= a_to_b * y_a;
				red_a -= red_ba_slope * y_a;
				green_a -= green_ba_slope * y_a;
				blue_a -= blue_ba_slope * y_a;
				y_a = 0;
			}
			if (b_to_c < c_to_a) {
				y_b -= y_a;
				y_a -= y_c;
				for (y_c = lineOffsets[y_c]; --y_a >= 0; y_c += viewport_width) {
					draw_shaded_scanline(colour_buffer, y_c, x_b >> 16, x_c >> 16, red_b, green_b, blue_b, red_c,
							green_c, blue_c, z_c, z_ba_slope, bufferOffset);
					x_b += b_to_c;
					x_c += c_to_a;
					red_b += cb_red_slope;
					green_b += cb_green_slope;
					blue_b += cb_blue_slope;
					red_c += ca_red_slope;
					green_c += ca_green_slope;
					blue_c += ca_blue_slope;
					z_c += z_ca_slope;
				}
				while (--y_b >= 0) {
					draw_shaded_scanline(colour_buffer, y_c, x_b >> 16, x_a >> 16, red_b, green_b, blue_b, red_a,
							green_a, blue_a, z_c, z_ba_slope, bufferOffset);
					x_b += b_to_c;
					x_a += a_to_b;
					red_b += cb_red_slope;
					green_b += cb_green_slope;
					blue_b += cb_blue_slope;
					red_a += red_ba_slope;
					green_a += green_ba_slope;
					blue_a += blue_ba_slope;
					y_c += viewport_width;
					z_c += z_ca_slope;
				}
				return;
			}
			y_b -= y_a;
			y_a -= y_c;
			for (y_c = lineOffsets[y_c]; --y_a >= 0; y_c += viewport_width) {
				draw_shaded_scanline(colour_buffer, y_c, x_c >> 16, x_b >> 16, red_c, green_c, blue_c, red_b, green_b,
						blue_b, z_c, z_ba_slope, bufferOffset);
				x_b += b_to_c;
				x_c += c_to_a;
				red_b += cb_red_slope;
				green_b += cb_green_slope;
				blue_b += cb_blue_slope;
				red_c += ca_red_slope;
				green_c += ca_green_slope;
				blue_c += ca_blue_slope;
				z_c += z_ca_slope;
			}
			while (--y_b >= 0) {
				draw_shaded_scanline(colour_buffer, y_c, x_a >> 16, x_b >> 16, red_a, green_a, blue_a, red_b, green_b,
						blue_b, z_c, z_ba_slope, bufferOffset);
				x_b += b_to_c;
				x_a += a_to_b;
				red_b += cb_red_slope;
				green_b += cb_green_slope;
				blue_b += cb_blue_slope;
				red_a += red_ba_slope;
				green_a += green_ba_slope;
				blue_a += blue_ba_slope;
				z_c += z_ca_slope;
				y_c += viewport_width;
			}
			return;
		}
		x_a = x_c <<= 16;
		red_a = red_c <<= 16;
		green_a = green_c <<= 16;
		blue_a = blue_c <<= 16;
		if (y_c < 0) {
			x_a -= b_to_c * y_c;
			x_c -= c_to_a * y_c;
			red_a -= cb_red_slope * y_c;
			green_a -= cb_green_slope * y_c;
			blue_a -= cb_blue_slope * y_c;
			red_c -= ca_red_slope * y_c;
			green_c -= ca_green_slope * y_c;
			blue_c -= ca_blue_slope * y_c;
			z_c -= z_ca_slope * y_c;
			y_c = 0;
		}
		x_b <<= 16;
		red_b <<= 16;
		green_b <<= 16;
		blue_b <<= 16;
		if (y_b < 0) {
			x_b -= a_to_b * y_b;
			red_b -= red_ba_slope * y_b;
			green_b -= green_ba_slope * y_b;
			blue_b -= blue_ba_slope * y_b;
			y_b = 0;
		}
		if (b_to_c < c_to_a) {
			y_a -= y_b;
			y_b -= y_c;
			for (y_c = lineOffsets[y_c]; --y_b >= 0; y_c += viewport_width) {
				draw_shaded_scanline(colour_buffer, y_c, x_a >> 16, x_c >> 16, red_a, green_a, blue_a, red_c, green_c,
						blue_c, z_c, z_ba_slope, bufferOffset);
				x_a += b_to_c;
				x_c += c_to_a;
				red_a += cb_red_slope;
				green_a += cb_green_slope;
				blue_a += cb_blue_slope;
				red_c += ca_red_slope;
				green_c += ca_green_slope;
				blue_c += ca_blue_slope;
				z_c += z_ca_slope;
			}
			while (--y_a >= 0) {
				draw_shaded_scanline(colour_buffer, y_c, x_b >> 16, x_c >> 16, red_b, green_b, blue_b, red_c, green_c,
						blue_c, z_c, z_ba_slope, bufferOffset);
				x_b += a_to_b;
				x_c += c_to_a;
				red_b += red_ba_slope;
				green_b += green_ba_slope;
				blue_b += blue_ba_slope;
				red_c += ca_red_slope;
				green_c += ca_green_slope;
				blue_c += ca_blue_slope;
				z_c += z_ca_slope;
				y_c += viewport_width;
			}
			return;
		}
		y_a -= y_b;
		y_b -= y_c;
		for (y_c = lineOffsets[y_c]; --y_b >= 0; y_c += viewport_width) {
			draw_shaded_scanline(colour_buffer, y_c, x_c >> 16, x_a >> 16, red_c, green_c, blue_c, red_a, green_a,
					blue_a, z_c, z_ba_slope, bufferOffset);
			x_a += b_to_c;
			x_c += c_to_a;
			red_a += cb_red_slope;
			green_a += cb_green_slope;
			blue_a += cb_blue_slope;
			red_c += ca_red_slope;
			green_c += ca_green_slope;
			blue_c += ca_blue_slope;
			z_c += z_ca_slope;
		}
		while (--y_a >= 0) {
			draw_shaded_scanline(colour_buffer, y_c, x_c >> 16, x_b >> 16, red_c, green_c, blue_c, red_b, green_b,
					blue_b, z_c, z_ba_slope, bufferOffset);
			x_b += a_to_b;
			x_c += c_to_a;
			red_b += red_ba_slope;
			green_b += green_ba_slope;
			blue_b += blue_ba_slope;
			red_c += ca_red_slope;
			green_c += ca_green_slope;
			blue_c += ca_blue_slope;
			y_c += viewport_width;
			z_c += z_ca_slope;
		}
	}

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