我对 C# 和 OpenGL 都很陌生。因此，对于任何愚蠢的错误，我提前表示歉意。
我正在尝试使用 OpenTK 渲染一个简单的矩形。我已经学习了很多教程并开始了解到底需要做什么。事实上，我能够在某一时刻渲染它
出于某种原因，在我尝试摆弄顶点着色器代码(尝试将法线坐标转换为 NDC)后，一切都停止工作。我什至没有碰过我的游戏窗口代码(至少我不记得了)。所以这真的让我很沮丧，因为我似乎无法找出出了什么问题。现在出现的是这样的:
注意:背景颜色不同，因为我更改了它。
我的猜测是，要么是着色器代码，要么是一些绑定(bind)问题。我不太确定。如果有人可以帮助我，我将不胜感激!
以下是文件:
Game.cs
using System;
using OpenTK;
using OpenTK.Graphics.OpenGL4;
using OpenTK.Windowing.Common;
using OpenTK.Windowing.Desktop;
using OpenTK.Windowing.GraphicsLibraryFramework;
using OpenTK.Mathematics;
namespace Test
{
public class Game : GameWindow
{
private int vertexBufferHandle;
private int colorBufferHandle;
private int indexBufferHandle;
private int vertexArrayHandle;
private Shader shader;
private readonly float[] vertices = new float[]
{
-0.7f, -0.5f, 0.0f,
-0.7f, 0.5f, 0.0f,
0.7f, -0.5f, 0.0f,
0.7f, 0.5f, 0.0f
};
private readonly float[] colors = new float[]
{
1.0f, 0.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f
};
private readonly uint[] indices = new uint[]
{
0, 1, 2,
2, 1, 3
};
public Game(int width, int height, string title = "Game") : base(GameWindowSettings.Default, new NativeWindowSettings()
{
Title = title,
Size = new Vector2i(width, height),
WindowBorder = WindowBorder.Fixed,
StartVisible = false,
StartFocused = true,
API = ContextAPI.OpenGL,
Profile = ContextProfile.Core,
APIVersion = new Version(4, 1)
})
{
this.CenterWindow();
}
protected override void OnLoad()
{
this.IsVisible = true;
GL.ClearColor(Color4.AliceBlue);
this.vertexBufferHandle = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, this.vertexBufferHandle);
GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * sizeof(float), vertices, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
this.colorBufferHandle = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, this.colorBufferHandle);
GL.BufferData(BufferTarget.ArrayBuffer, colors.Length * sizeof(float), colors, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
this.indexBufferHandle = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ElementArrayBuffer, this.indexBufferHandle);
GL.BufferData(BufferTarget.ElementArrayBuffer, indices.Length * sizeof(float), indices, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
vertexArrayHandle = GL.GenVertexArray();
GL.BindVertexArray(vertexArrayHandle);
GL.BindBuffer(BufferTarget.ArrayBuffer, this.vertexBufferHandle);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 3 * sizeof(float), 0);
GL.EnableVertexAttribArray(0);
GL.BindBuffer(BufferTarget.ArrayBuffer, this.colorBufferHandle);
GL.VertexAttribPointer(1, 4, VertexAttribPointerType.Float, false, 4 * sizeof(float), 0);
GL.EnableVertexAttribArray(1);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, this.indexBufferHandle);
GL.BindVertexArray(0);
shader = new Shader("Shader/shader.vert", "Shader/shader.frag");
base.OnLoad();
}
protected override void OnRenderFrame(FrameEventArgs args)
{
GL.Clear(ClearBufferMask.ColorBufferBit);
shader.Use();
GL.BindVertexArray(vertexArrayHandle);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, indexBufferHandle);
GL.DrawElements(PrimitiveType.Triangles, 6, DrawElementsType.UnsignedInt, 0);
// GL.BindVertexArray(0);
Context.SwapBuffers();
base.OnRenderFrame(args);
}
protected override void OnUpdateFrame(FrameEventArgs args)
{
base.OnUpdateFrame(args);
}
protected override void OnUnload()
{
GL.BindVertexArray(0);
GL.DeleteVertexArray(vertexArrayHandle);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
GL.DeleteBuffer(this.vertexBufferHandle);
GL.DeleteBuffer(this.colorBufferHandle);
GL.UseProgram(0);
GL.DeleteProgram(shader.ProgramHandle);
base.OnUnload();
}
}
}
Program.cs
using System;
namespace Test
{
class Rectangle
{
static void Main(string[] args)
{
using(Game game = new Game(width: 400, height: 400))
{
game.Run();
};
}
}
}
Shader.cs
using System;
using OpenTK.Graphics.OpenGL4;
namespace Test
{
public class Shader
{
public int ProgramHandle;
public Shader(string vert, string frag)
{
string vertexShaderCode = File.ReadAllText("../../../" + vert);
string fragmentShaderCode = File.ReadAllText("../../../" + frag);
int vertexShaderHandle = GL.CreateShader(ShaderType.VertexShader);
GL.ShaderSource(vertexShaderHandle, vertexShaderCode);
int fragmentShaderHandle = GL.CreateShader(ShaderType.FragmentShader);
GL.ShaderSource(fragmentShaderHandle, fragmentShaderCode);
Console.Write(GL.GetShaderInfoLog(vertexShaderHandle));
Console.Write(GL.GetShaderInfoLog(fragmentShaderHandle));
GL.CompileShader(vertexShaderHandle);
GL.CompileShader(fragmentShaderHandle);
this.ProgramHandle = GL.CreateProgram();
GL.AttachShader(this.ProgramHandle, vertexShaderHandle);
GL.AttachShader(this.ProgramHandle, fragmentShaderHandle);
GL.LinkProgram(this.ProgramHandle);
GL.DetachShader(this.ProgramHandle, vertexShaderHandle);
GL.DetachShader(this.ProgramHandle, fragmentShaderHandle);
GL.DeleteShader(vertexShaderHandle);
GL.DeleteShader(fragmentShaderHandle);
}
public void Use()
{
GL.UseProgram(ProgramHandle);
}
}
}
(我没有从 GL.GetShaderInfoLog 收到任何错误)
shader.vert
#version 410
layout(location = 0) in vec3 aPosition;
layout(location = 1) in vec4 aColor;
out vec4 vColor;
void main(void){
vColor = aColor;
gl_Position = vec4(aPosition, 1f);
}
着色器.frag
#version 410
in vec4 vColor;
out vec4 outputColor;
void main()
{
outputColor = vColor;
}
最佳答案
这是偷偷摸摸的，但 1f 不是 GLSL 中的有效浮点常量。
官方语法是:
1f 是一个带有 float 后缀的数字序列，但这不是选项之一。需要有一个指数部分，或者一个点才能将数字序列转换为小数常数。
I don't get any errors from the GL.GetShaderInfoLog
如果您在编译着色器之后调用此函数，您应该得到一个。
关于c# - 为什么我的代码没有渲染一个非常简单的矩形？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/75645813/