引入 Gfx::DrawContext 统一绘制入口，封装FrameBuffer/DepthBuffer/Rasterizer/角形光栅化；main.cpp 改用 DrawContext；同步更新文档路径

src/Apps/Demo/main.cpp

@@ -7,14 +7,11 @@
 #include "Matrix4x4.h"
 #include "MathUtil.h"
 #include "Color.h"
-#include "FrameBuffer.h"
-#include "Rasterizer.h"
-#include "TriangleRasterizer.h"
 #include "Triangle.h"
 #include "Camera.h"
 #include <cstdlib>
 #include "Vertex.h"
-#include "DepthBuffer.h"
+#include "DrawContext.h"
 
 #include "Display.h"
 #ifdef USE_FRAMEBUFFER
@@ -117,10 +114,7 @@ int main(int argc, char *argv[])
 		return -1;
 	}
 
-	Core::FrameBuffer *frameBuffer = new Core::FrameBuffer(width, height);
-	Core::DepthBuffer *depthBuffer = new Core::DepthBuffer(width, height);
-	Rasterizer::Rasterizer rasterizer(frameBuffer, depthBuffer);
-	Rasterizer::TriangleRasterizer triangleRasterizer(frameBuffer, depthBuffer);
+	Gfx::DrawContext ctx(width, height);
 
 	Scene::Camera camera;
 	camera.transform.position = Math::Vector3(0.0f, 0.0f, 3.0f);
@@ -155,13 +149,12 @@ int main(int argc, char *argv[])
 	const RenderData::Color cubeColor(240, 240, 240, 255);
 	const float aspectRatio = static_cast<float>(width) / static_cast<float>(height);
 
-	bool isRuning = true;
-	while (isRuning)
+	bool isRunning = true;
+	while (isRunning)
 	{
-		display->poll_events(isRuning);
+		display->poll_events(isRunning);
 
-		frameBuffer->clear(clearColor);
-		depthBuffer->clear();
+		ctx.clear(clearColor);
 
 		const float timeSeconds = static_cast<float>(display->get_time_ms()) * 0.001f;
 		const Math::Matrix4x4 model =
@@ -204,10 +197,6 @@ int main(int argc, char *argv[])
 				continue;
 			}
 
-			const Math::Vector3 &viewV0 = viewSpaceVertices[cubeTriangle.vertices[0]];
-			const Math::Vector3 &viewV1 = viewSpaceVertices[cubeTriangle.vertices[1]];
-			const Math::Vector3 &viewV2 = viewSpaceVertices[cubeTriangle.vertices[2]];
-
 			drawTriangles[drawCommandCount++] =
 				RenderData::Triangle(
 					Scene::Vertex(v0.screen),
@@ -217,7 +206,7 @@ int main(int argc, char *argv[])
 
 		for (size_t i = 0; i < drawCommandCount; ++i)
 		{
-			triangleRasterizer.DrawTriangle2D(drawTriangles[i], cubeColor);
+			ctx.draw_triangle(drawTriangles[i], cubeColor);
 		}
 
 		for (size_t faceIndex = 0; faceIndex < cubeFaces.size(); ++faceIndex)
@@ -239,19 +228,17 @@ int main(int argc, char *argv[])
 					continue;
 				}
 
-				rasterizer.DrawLine(
+				ctx.draw_line(
 					Math::Vector2(start.screen.x, start.screen.y).to_vector2Int(),
 					Math::Vector2(end.screen.x, end.screen.y).to_vector2Int(),
 					clearColor);
 			}
 		}
 
-		display->present(frameBuffer);
+		ctx.present(display);
 	}
 
 	display->shutdown();
 	delete display;
-	delete frameBuffer;
-	delete depthBuffer;
 	return 0;
 }