macos - 在 Swift/Mac OS X 中编译着色器

Question

我在 Swift 中创建了一个自定义的 NGOpenGLView，我正在尝试编译一些着色器。我遇到了着色器编译错误，但 glGetShaderInfoLog 没有返回任何内容...无法调试。不过，着色器是使用 OpenGL Shader 构建器编译的，所以我不知道出了什么问题。

这就是我编译着色器并尝试获取信息的方式，

class CustomOpenGLView : NSOpenGLView {

    override func awakeFromNib() {
        var attributes : [NSOpenGLPixelFormatAttribute] = [
            NSOpenGLPixelFormatAttribute(NSOpenGLPFADepthSize), 
            NSOpenGLPixelFormatAttribute(24), 
            NSOpenGLPixelFormatAttribute(NSOpenGLPFAOpenGLProfile), 
            NSOpenGLPixelFormatAttribute(NSOpenGLProfileVersion3_2Core), 
            NSOpenGLPixelFormatAttribute(0)]

        self.pixelFormat = NSOpenGLPixelFormat(attributes: attributes)

        initShaders()
    }
    override func drawRect(dirtyRect: NSRect) {
        glClearColor(0, 0, 0, 1)
        glClear(GLbitfield(GL_COLOR_BUFFER_BIT))
        //drawAnObject()
        glFlush()
    }


    func compileShader(shaderName: NSString, shaderType: GLenum) -> GLuint {

        let shaderPath: NSString? = NSBundle.mainBundle().pathForResource(shaderName, ofType: nil)
        if shaderPath == nil {
            println("Can't find shader \(shaderName)")
            return 0
        }
        var error: NSError? = nil
        let shaderString = NSString(contentsOfFile: shaderPath!, encoding: NSUTF8StringEncoding, error: &error)
        if shaderString == nil {
            println("Failed to set contents shader of shader file!")
            return 0
        }

        var shaderHandle: GLuint = glCreateShader(shaderType)

        var shaderStringUTF8 = shaderString!.cStringUsingEncoding(NSUTF8StringEncoding)
        var shaderStringLength: GLint = GLint(shaderString!.length)
        glShaderSource(shaderHandle, 1, &shaderStringUTF8, &shaderStringLength)

        glCompileShader(shaderHandle)

        var compileSuccess: GLint = GLint()
        glGetShaderiv(shaderHandle, GLenum(GL_COMPILE_STATUS), &compileSuccess)
        if (compileSuccess == GL_FALSE) {
            println("Failed to compile shader! \(shaderName)")
            var value: GLint = 0
            glGetShaderiv(shaderHandle, GLenum(GL_INFO_LOG_LENGTH), &value)
            var infoLog: [GLchar] = [GLchar](count: Int(value), repeatedValue: 0)
            var infoLogLength: GLsizei = 0
            glGetShaderInfoLog(shaderHandle, value, &infoLogLength, &infoLog)
            var s = NSString(bytes: infoLog, length: Int(infoLogLength), encoding: NSASCIIStringEncoding)
            println(s)
            return 0
        }
        return shaderHandle
    }

    func initShaders() {

        // Compile our vertex and fragment shaders.
        var vertexShader: GLuint = self.compileShader("geometryColor.vs", shaderType: GLenum(GL_VERTEX_SHADER))
        var fragmentShader: GLuint = self.compileShader("color.fs", shaderType: GLenum(GL_FRAGMENT_SHADER))
    // ... etc
    }
}

vs shader就是这样，

attribute vec3 position;
attribute vec4 color;
uniform mat4 Pmatrix;
uniform mat4 Vmatrix;
uniform mat4 Mmatrix;
varying vec4 vColor;
void main(void) { // pre-built function
    gl_Position = Pmatrix * Vmatrix * Mmatrix * vec4(position, 1.);
    vColor = color;
}

但我也尝试过更新的语法，

in vec3 position;
in vec4 color;
uniform mat4 Pmatrix;
uniform mat4 Vmatrix;
uniform mat4 Mmatrix;
out vec4 vColor;
void main(void) { // pre-built function
    gl_Position = Pmatrix * Vmatrix * Mmatrix * vec4(position, 1.);
    vColor = color;
}

glClear 正在运行，所以 View 本身看起来很好。关于如何调试这个的任何想法？

Answer 1

在创建和编译着色器之前，尝试使上下文成为当前上下文，我对 swift 不熟悉，但在您发布的代码中似乎没有做任何事情。

我有同样的问题，这里有另一个问题有这个答案，但我找不到它......