WebGL - Clip Space | Pixel Space?

// Renderer Beispiel
 render(){
       const s2  = new Square(300, 100, 70, [0, 1, 1, 1]);
       s2.setup(this.context, this.program); 
       s2.render(this.program, this.context, deltaTime);

       this.vertexManager.draw(3, 0, 4, 100, 100, 0, [0,0,1,1]);
 }
// 

export class Square extends Renderable {
    constructor (x, y, size, color) {
        super();
        this.x = x;
        this.y = y;
        this.size = size;
        this.color = color;
        this.vertices = new Float32Array([
            -size / 2, -size / 2,
            size / 2, -size / 2,
            size / 2, size / 2,
            -size / 2, size / 2,
        ]);
        this.vertexBuffer = null;
        this.colorBuffer = null;
        this.transformationMatrix = createIdentityMatrix3();
    }

    setup (gl, program) {
        this.vertexBuffer = gl.createBuffer();
        gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
        gl.bufferData(gl.ARRAY_BUFFER, this.vertices,  gl.STATIC_DRAW);
    }

    updateTransformationMatrix (x, y, scaleX, scaleY, angle) {
        const translationMatrix = createTranslationMatrix(x, y);
        const rotationMatrix = createRotationMatrix(angle);
        const scalingMatrix = createScalingMatrix(scaleX, scaleY);

        // Combine the matrices: translation * rotation * scaling
        const combinedMatrix = multiplyMatrices(rotationMatrix,          multiplyMatrices(translationMatrix, scalingMatrix));

        // Save the transformation matrix
        this.transformationMatrix = combinedMatrix;
    }


    render (program, gl, camera, deltaTime) {
        gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);

        // Re-enable the vertex attribute array
        const positionLocation = gl.getAttribLocation(program, 'a_position');
        gl.enableVertexAttribArray(positionLocation);
        gl.vertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0);

        const colorLocation = gl.getUniformLocation(program, 'u_color');
        gl.uniform4fv(colorLocation, this.color);

        const matrixLocation = gl.getUniformLocation(program, 'u_matrix');
        this.updateTransformationMatrix(this.x, this.y, 1.0, 1.0,  0);
        gl.uniformMatrix3fv(matrixLocation, false, this.transformationMatrix);

        gl.drawArrays(gl.TRIANGLE_FAN, 0, this.vertices.length / 2 + 1);
    }
}

export default class VertexManager {
    constructor (gl, program) {
        this.gl = gl;
        this.program = program;
        this.buffers = new Map();
        this.initBuffers();
    }

    initBuffers () {
        this.createBuffer(BUFFER_TYPES.CIRCLE, createPolygonVertices(64, 1));
        this.createBuffer(BUFFER_TYPES.SQUARE, new Float32Array([
            -0.5, -0.5,
            0.5, -0.5,
            0.5, 0.5,
            -0.5, 0.5,
        ]));
    ....
    }

    createBuffer (type, vertices) {
        const buffer = this.gl.createBuffer();
        this.gl.bindBuffer(this.gl.ARRAY_BUFFER, buffer);
        this.gl.bufferData(this.gl.ARRAY_BUFFER, vertices, this.gl.STATIC_DRAW);
        this.buffers.set(type, { buffer, vertexCount: vertices.length / 2 });
    }

    draw (type, x, y, scaleX, scaleY, rotation, color) {
        const { buffer, vertexCount } = this.buffers.get(type);

        this.gl.bindBuffer(this.gl.ARRAY_BUFFER, buffer);

        // Re-enable the vertex attribute array
        const positionLocation = this.gl.getAttribLocation(this.program, 'a_position');
        this.gl.enableVertexAttribArray(positionLocation);
        this.gl.vertexAttribPointer(positionLocation, 2, this.gl.FLOAT, false, 0, 0);

        // Setup the color
        const colorLocation = this.gl.getUniformLocation(this.program, 'u_color');
        this.gl.uniform4fv(colorLocation, color);

        const matrixLocation = this.gl.getUniformLocation(this.program, 'u_matrix');
        // Create transformation matrices directly in pixel space
        const translationMatrix = createTranslationMatrix(x, y);
        const rotationMatrix = createRotationMatrix(rotation);
        const scalingMatrix = createScalingMatrix(scaleX, scaleY);

        // Combine them: translationMatrix * rotationMatrix * scalingMatrix
        const combinedMatrix = multiplyMatrices(rotationMatrix, multiplyMatrices(translationMatrix, scalingMatrix));

        // Pass the transformation matrix to the shader
        this.gl.uniformMatrix3fv(matrixLocation, false, combinedMatrix);

        this.gl.drawArrays(this.gl.TRIANGLE_FAN, 0, vertexCount);
    }
}

Meine Frage ist, warum mein Quadrat korrekt im Pixel-Space gerendert wird, während die draw-Operation in meinem VertexManager Clip-Space zeichnet, obwohl beide denselben Shader verwenden. Ich habe das Problem schon seit Stunden versucht zu lösen. Hat jemand eine Lösung oder einen Hinweis, was ich möglicherweise falsch mache?

Bild zum Beitrag
JavaScript, Code, OpenGL, Webentwicklung
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