public void Render()
{
////测试画线函数------>>>>>>
//VertexOut pA = new VertexOut();
//pA.posProjective = new Vector4D(100,0,0,1);
//VertexOut pB = new VertexOut();
//pB.posProjective = new Vector4D(100, 100, 0, 1);
//BresenhamLineRasterization(pA, pB);
//return;
////测试画线函数<<<<<<<--------
///
Vector3D tmp = scene.camera.transform.GetPosition();
cameraPosition = new Vector3D(tmp.x, tmp.y, tmp.z);
//cameraPosition.x = -cameraPosition.x;
//cameraPosition.y = -cameraPosition.y;
//cameraPosition.z = -cameraPosition.z;
Vector3D up = new Vector3D(0, 1, 0);
//up.x = -up.x;
//up.y = -up.y;
//up.z = -up.z;
viewMatrix.SetLookAt(cameraPosition, new Vector3D(0, 0, 0), up);
backBuffer.Clear();
//scene.camera
for (int i = 0; i < scene.gameObjects.Count; i++)
{
GameObject3D gameObject = scene.gameObjects[i];
BaseShader shader = gameObject.meshRenderer.material.shader;
shader.SetModelMatrix(gameObject.transform.ToMatrix());
shader.SetViewMatrix(viewMatrix);
shader.SetEyePos(cameraPosition);
shader.SetProjectMatrix(projectMatrix);
shader.SetLight(scene.light);
//图元装配
Mesh mesh = gameObject.meshRenderer.mesh;
//Debug.LogError("%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%");
for (int j = 0; j < mesh.indices.Length; j += 3)
{
Vertex p1, p2, p3;
p1 = mesh.vertices[mesh.indices[j]];
p2 = mesh.vertices[mesh.indices[j + 1]];
p3 = mesh.vertices[mesh.indices[j + 2]];
//顶点着色(遍历三角形)
VertexOut vertexOut1, vertexOut2, vertexOut3;
vertexOut1 = shader.VertexShader(p1);
vertexOut2 = shader.VertexShader(p2);
vertexOut3 = shader.VertexShader(p3);
shader.ProjectedMap(vertexOut1);
shader.ProjectedMap(vertexOut2);
shader.ProjectedMap(vertexOut3);
//背面裁剪
if (shader.backFaceCulling)
{
if (polygonMode != PolygonMode.Wire && !BackFaceCulling(vertexOut1.posWorld, vertexOut2.posWorld, vertexOut3.posWorld))
{
continue;
}
}
//透视处理
PerspectiveDivision(vertexOut1);
PerspectiveDivision(vertexOut2);
PerspectiveDivision(vertexOut3);
//几何裁剪
//屏幕空间转换
vertexOut1.posProjective = Matrix4x4.MultiplyVector4D(viewPortMatrix, vertexOut1.posProjective);
vertexOut2.posProjective = Matrix4x4.MultiplyVector4D(viewPortMatrix, vertexOut2.posProjective);
vertexOut3.posProjective = Matrix4x4.MultiplyVector4D(viewPortMatrix, vertexOut3.posProjective);
//Debug.LogError("vertexOut1.posProjective " + vertexOut1.posProjective.x
// + " " + vertexOut1.posProjective.y + " " + vertexOut1.posProjective.z );
//Debug.LogError("vertexOut2.posProjective " + vertexOut2.posProjective.x
// + " " + vertexOut2.posProjective.y + " " + vertexOut2.posProjective.z );
//Debug.LogError("vertexOut3.posProjective " + vertexOut3.posProjective.x
// + " " + vertexOut3.posProjective.y + " " + vertexOut3.posProjective.z );
//Debug.LogError("-----------------");
//片段着色
if (polygonMode == PolygonMode.Wire)
{
//线框模式
BresenhamLineRasterization(vertexOut1, vertexOut2);
BresenhamLineRasterization(vertexOut1, vertexOut3);
BresenhamLineRasterization(vertexOut2, vertexOut3);
}
else
{
//三角形填充模式
EdgeWalkingFillRasterization(vertexOut1, vertexOut2, vertexOut3, shader);
}
}
}
}
