我有一个简单的函数，可以创建一个覆盖整个屏幕的正方形，我用它来应用后期处理效果，但据我所知，它是导致无数错误的原因。
当我在 PIX 中运行我的代码时，我得到以下网格，但正方形应该是直的并覆盖屏幕，不是吗？
我的顶点着色器不进行任何转换，只是将位置信息传递给像素着色器。
创建正方形的函数如下：
private void InitializeGeometry()
{
meshes = new Dictionary<Vector3, Mesh>();
//build array of vertices for one square
ppVertex[] vertexes = new ppVertex[4];
//vertexes[0].Position = new Vector3(-1f, -1f, 0.25f);
vertexes[0].Position = new Vector3(-1, -1, 1f);
vertexes[1].Position = new Vector3(-1, 1, 1f);
vertexes[2].Position = new Vector3(1, -1, 1f);
vertexes[3].Position = new Vector3(1, 1, 1f);
vertexes[0].TexCoords = new Vector2(0, 0);
vertexes[1].TexCoords = new Vector2(0, 1);
vertexes[2].TexCoords = new Vector2(1, 0);
vertexes[3].TexCoords = new Vector2(1, 1);
//build index array for the vertices to build a quad from two triangles
short[] indexes = { 0, 1, 2, 1, 3, 2 };
//create the data stream to push the vertex data into the buffer
DataStream vertices = new DataStream(Marshal.SizeOf(typeof(Vertex)) * 4, true, true);
//load the data stream
vertices.WriteRange(vertexes);
//reset the data position
vertices.Position = 0;
//create the data stream to push the index data into the buffer
DataStream indices = new DataStream(sizeof(short) * 6, true, true);
//load the data stream
indices.WriteRange(indexes);
//reset the data position
indices.Position = 0;
//create the mesh object
Mesh mesh = new Mesh();
//create the description of the vertex buffer
D3D.BufferDescription vbd = new BufferDescription();
vbd.BindFlags = D3D.BindFlags.VertexBuffer;
vbd.CpuAccessFlags = D3D.CpuAccessFlags.None;
vbd.OptionFlags = ResourceOptionFlags.None;
vbd.SizeInBytes = Marshal.SizeOf(typeof(Vertex)) * 4;
vbd.Usage = ResourceUsage.Default;
//create and assign the vertex buffer to the mesh, filling it with data
mesh.VertexBuffer = new D3D.Buffer(device, vertices, vbd);
//create the description of the index buffer
D3D.BufferDescription ibd = new BufferDescription();
ibd.BindFlags = D3D.BindFlags.IndexBuffer;
ibd.CpuAccessFlags = D3D.CpuAccessFlags.None;
ibd.OptionFlags = ResourceOptionFlags.None;
ibd.SizeInBytes = sizeof(short) * 6;
ibd.Usage = ResourceUsage.Default;
//create and assign the index buffer to the mesh, filling it with data
mesh.IndexBuffer = new D3D.Buffer(device, indices, ibd);
//get vertex and index counts
mesh.vertices = vertexes.GetLength(0);
mesh.indices = indexes.Length;
//close the data streams
indices.Close();
vertices.Close();
meshes.Add(new Vector3(0), mesh);
}
当我渲染正方形时：
private void DrawScene()
{
lock (meshes)
{
foreach (Mesh mesh in meshes.Values)
{
if (mesh.indices > 0)
{
try
{
//if (camera.SphereInFrustum(mesh.BoundingSphere, sphereRadius))
//{
context.InputAssembler.SetVertexBuffers(0, new VertexBufferBinding(mesh.VertexBuffer, Marshal.SizeOf(typeof(Vertex)), 0));
context.InputAssembler.SetIndexBuffer(mesh.IndexBuffer, Format.R16_UInt, 0);
context.DrawIndexed(mesh.indices, 0, 0);
//}
}
catch (Exception err)
{
MessageBox.Show(err.Message);
}
}
}
}
}
编辑：我添加了正在运行的顶点着色器
cbuffer EveryFrame : register(cb0)
{
float3 diffuseColor : packoffset(c0);
float3 lightdir : packoffset(c1);
};
cbuffer EveryMotion : register(cb1)
{
float4x4 WorldViewProjection : packoffset(c0);
float4x4 LightWorldViewProjection : packoffset(c4);
};
struct VS_IN
{
float3 position : POSITION;
float3 normal : NORMAL;
float4 col : TEXCOORD;
};
struct PS_IN
{
float4 position : SV_POSITION;
float4 col : TEXCOORD;
float3 normal : NORMAL;
};
PS_IN VS(VS_IN input)
{
PS_IN output;
output.position = float4(input.position,1);
output.col = input.col;
output.normal = input.normal;
return output;
}
这是 PIX 的顶点输出。
上一篇：
帖子VS：
这是我选择调试顶点 0 时生成的反汇编 PIX
//
// Generated by Microsoft (R) HLSL Shader Compiler 9.29.952.3111
//
//
//
// Input signature:
//
// Name Index Mask Register SysValue Format Used
// ---------------- ----- ------ -------- -------- ------ ------
// POSITION 0 xyz 0 NONE float xyz
// NORMAL 0 xyz 1 NONE float xyz
// TEXCOORD 0 xyzw 2 NONE float
//
//
// Output signature:
//
// Name Index Mask Register SysValue Format Used
// ---------------- ----- ------ -------- -------- ------ ------
// SV_POSITION 0 xyzw 0 POS float xyzw
// TEXCOORD 0 xyzw 1 NONE float xyzw
// NORMAL 0 xyz 2 NONE float xyz
//
vs_4_0
dcl_input v0.xyz
dcl_input v1.xyz
dcl_output_siv o0.xyzw , position
dcl_output o1.xyzw
dcl_output o2.xyz
mov o0.xyz, v0.xyzx
mov o0.w, l(1.000000)
mov o1.xyzw, l(1.000000, 1.000000, 1.000000, 1.000000)
mov o2.xyz, v1.xyzx
ret
// Approximately 5 instruction slots used
我还添加了输入汇编器：
private void SetPPInputAssembler(Shader shader)
{
InputElement[] elements = new[] {
new InputElement("POSITION",0,Format.R32G32B32_Float,0),
new InputElement("NORMAL",0,Format.R32G32B32_Float,12,0),
new InputElement("TEXCOORD",0,Format.R32G32_Float,24,0),
};
InputLayout layout = new InputLayout(device, shader.InputSignature, elements);
context.InputAssembler.InputLayout = layout;
context.InputAssembler.PrimitiveTopology = PrimitiveTopology.TriangleList;
}