OpenTK 始终获得统一位置 -1

Question

我一直在努力学习 OpenTk，以便我可以在 c# 中轻松使用 OpenGl。我现在的问题是，当我尝试获取我的两件制服的位置时，两者都是 returns -1。

顶点着色器：

#version 440 core

uniform vec3 position

void main(void)
{
    gl_Position = position;
}

片段着色器：

#version 440 core

uniform vec4 frag_Color;
out vec4 color;

void main(void)
{
    color = frag_Color;
}

代码：

GL.BindVertexArray(pointVertexArray);
GL.UseProgram(program);

int a = GL.GetUniformLocation(program, "position");
int b = GL.GetUniformLocation(program, "frag_Color");

Debug.WriteLine(a + ", " + b);

GL.DrawArrays(PrimitiveType.Points, 0, 1);
GL.PointSize(size);

编辑：这是我创建程序的地方：

public int CreateShader(string path) {
        var vertexShader = GL.CreateShader(ShaderType.VertexShader);

        GL.ShaderSource(vertexShader, File.ReadAllText(".\shaders\" + path + ".vert"));
        GL.CompileShader(vertexShader);

        var fragmentShader = GL.CreateShader(ShaderType.FragmentShader);
        GL.ShaderSource(fragmentShader, File.ReadAllText(".\shaders\" + path + ".frag"));
        GL.CompileShader(fragmentShader);

        var program = GL.CreateProgram();
        GL.AttachShader(program, vertexShader);
        GL.AttachShader(program, fragmentShader);
        GL.LinkProgram(program);

        GL.DetachShader(program, vertexShader);
        GL.DetachShader(program, fragmentShader);
        GL.DeleteShader(vertexShader);
        GL.DeleteShader(fragmentShader);

        programs.Add(program);
        return program;
    }

Answer 1

记得检查着色器的编译状态。

int status;
GL.GetShader(shader, ShaderParameter.CompileStatus, out status);
if (status == 0)
    throw new Exception(
        String.Format("Error compiling {0} shader: {1}",
            type.ToString(), GL.GetShaderInfoLog(shader)));

因为你的顶点着色器只有两个拼写错误，编译状态会告诉你。

0(5) : error C0000: syntax error, unexpected reserved word "void", expecting ',' or ';' at token "void"

0(7) : error C1035: assignment of incompatible types

你少了一个分号，gl_Position 是 vec4 而不是 vec3，编译状态会告诉你这一点。

uniform vec3 position;
                     ^ Missing
[...]

gl_Position = vec4(position, 1.0);

OpenTK 始终获得统一位置 -1

OpenTK get uniform location always -1

c#

opengl

glsl

opentk