支持抗锯齿

test/rasterization/dvr_canvas.cpp

@@ -0,0 +1,83 @@
+#include "dvr_canvas.h"
+
+#include <array>
+
+#define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */
+#include <SDL3/SDL.h>
+
+void Canvas::reset(int32_t width, int32_t height)
+{
+	m_width = width;
+	m_height = height;
+	m_pixels.resize(m_width * m_height);
+
+	for (int32_t i = 0; i < m_width * m_height; i++)
+	{
+		m_pixels[i].fragementID = -1;
+		m_pixels[i].mask = 0;
+		m_pixels[i].color = 0;
+	}
+
+	m_fragementArray.clear();
+}
+
+void Canvas::_insertTriangle(const Triangle& triangle)
+{
+	for (size_t i = 0; i < triangle.m_pixels.size(); i++)
+	{
+		const Triangle::Pixel trianglePixel = triangle.m_pixels[i];
+		Pixel& pixel = m_pixels[trianglePixel.y * m_width + trianglePixel.x];
+
+		Fragement newFragement;
+		newFragement.id = (int32_t)m_fragementArray.size();
+		newFragement.color = triangle.m_pixelColor;
+		newFragement.mask = trianglePixel.mask;
+		newFragement.next = pixel.fragementID;
+
+		pixel.fragementID = newFragement.id;
+		m_fragementArray.push_back(newFragement);
+	}
+}
+
+void Canvas::_update_without_AA()
+{
+	for (size_t i = 0; i < m_pixels.size(); i++)
+	{
+		Pixel& pixel = m_pixels[i];
+		if (pixel.fragementID < 0) continue;
+
+		const Fragement& fragement = m_fragementArray[pixel.fragementID];
+		pixel.mask = fragement.mask;
+		pixel.color = fragement.color;
+		pixel.alpha = 1.f;
+	}
+}
+
+void Canvas::update(davinci::AntiAliasingTech aaTech, const TriangleArray& triangleArray, const Triangle* pActionTriangle)
+{
+	reset(m_width, m_height);
+
+	for (size_t i = 0; i < triangleArray.size(); i++)
+	{
+		const Triangle& triangle = triangleArray[i];
+		_insertTriangle(triangle);
+	}
+
+	if (pActionTriangle != nullptr)
+	{
+		_insertTriangle(*pActionTriangle);
+	}
+
+	if (aaTech == davinci::AntiAliasingTech::AA_None)
+	{
+		_update_without_AA();
+	}
+	else if (aaTech == davinci::AntiAliasingTech::AA_MSAA_2X2)
+	{
+		_update_with_AA<4>();
+	}
+	else if ( aaTech == davinci::AntiAliasingTech::AA_MSAA_4X4)
+	{
+		_update_with_AA<16>();
+	}
+}