我正在尝试用Java（JOGL）移植一个简单的C ++示例。
但它不起作用，它一定是愚蠢的东西，但我看不到它..
public class OverlapNoDepth implements GLEventListener {
private int imageWidth = 800;
private int imageHeight = 600;
private GLCanvas canvas;
private GLSLProgramObject programObject;
private int[] vertexBufferObject = new int[1];
private int[] indexBufferObject = new int[1];
private int[] VAOs = new int[1];
private float[] vertexData = new float[]{
0.25f, 0.25f, -1.25f, 1.0f,
0.25f, -0.25f, -1.25f, 1.0f,
-0.25f, 0.25f, -1.25f, 1.0f,
0.0f, 1.0f, 1.0f, 1.0f,
0.0f, 1.0f, 1.0f, 1.0f,
0.0f, 1.0f, 1.0f, 1.0f
};
private int[] indexData = new int[]{
0, 2, 1
};
private String shadersFilepath = "/tut05/shaders/";
float[] perspectiveMatrix = new float[16];
float fFrustumScale = 1.0f;
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
OverlapNoDepth overlapNoDepth = new OverlapNoDepth();
Frame frame = new Frame("Tutorial 05 - Overlap No Depth");
frame.add(overlapNoDepth.getCanvas());
frame.setSize(overlapNoDepth.getCanvas().getWidth(), overlapNoDepth.getCanvas().getHeight());
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent windowEvent) {
System.exit(0);
}
});
frame.setVisible(true);
}
public OverlapNoDepth() {
initGL();
}
private void initGL() {
GLProfile profile = GLProfile.getDefault();
GLCapabilities capabilities = new GLCapabilities(profile);
canvas = new GLCanvas(capabilities);
canvas.setSize(imageWidth, imageHeight);
canvas.addGLEventListener(this);
}
@Override
public void init(GLAutoDrawable glad) {
System.out.println("init");
canvas.setAutoSwapBufferMode(false);
GL3 gl3 = glad.getGL().getGL3();
initializeProgram(gl3);
initializeVertexBuffer(gl3);
initializeVertexArrayObjects(gl3);
gl3.glEnable(GL3.GL_CULL_FACE);
gl3.glCullFace(GL3.GL_BACK);
gl3.glFrontFace(GL3.GL_CW);
}
@Override
public void dispose(GLAutoDrawable glad) {
System.out.println("dispose");
}
@Override
public void display(GLAutoDrawable glad) {
System.out.println("display");
GL3 gl3 = glad.getGL().getGL3();
gl3.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
gl3.glClear(GL3.GL_COLOR_BUFFER_BIT);
programObject.bind(gl3);
{
gl3.glBindVertexArray(VAOs[0]);
{
programObject.setUniform(gl3, "offset", new float[]{0.0f, 0.0f, 0.0f}, 3);
gl3.glDrawElements(GL3.GL_TRIANGLES, indexData.length, GL3.GL_UNSIGNED_INT, 0);
}
gl3.glBindVertexArray(0);
}
programObject.unbind(gl3);
// programObject.bind(gl3);
// {
// gl3.glBindBuffer(GL3.GL_ARRAY_BUFFER, vertexBufferObject[0]);
// {
// gl3.glEnableVertexAttribArray(0);
// gl3.glEnableVertexAttribArray(1);
// {
// programObject.setUniform(gl3, "offset", new float[]{0.0f, 0.0f, 0.0f}, 3);
// gl3.glVertexAttribPointer(0, 4, GL3.GL_FLOAT, false, 0, 0);
// gl3.glVertexAttribPointer(1, 4, GL3.GL_FLOAT, false, 0, 3 * 4 * 4);
//
// gl3.glDrawArrays(GL3.GL_TRIANGLES, 0, 3);
// }
// gl3.glDisableVertexAttribArray(0);
// gl3.glDisableVertexAttribArray(1);
// }
// }
// programObject.unbind(gl3);
glad.swapBuffers();
}
@Override
public void reshape(GLAutoDrawable glad, int x, int y, int w, int h) {
System.out.println("reshape() x: " + x + " y: " + y + " width: " + w + " height: " + h);
GL3 gl3 = glad.getGL().getGL3();
perspectiveMatrix[0] = fFrustumScale / (w / (float) h);
perspectiveMatrix[5] = fFrustumScale;
programObject.bind(gl3);
{
int perspectiveMatrixLocation = gl3.glGetUniformLocation(programObject.getProgId(), "perspectiveMatrix");
gl3.glUniformMatrix4fv(perspectiveMatrixLocation, 1, false, perspectiveMatrix, 0);
}
programObject.unbind(gl3);
gl3.glViewport(x, y, w, h);
}
private void buildShaders(GL3 gl3) {
System.out.print("Building shaders...");
programObject = new GLSLProgramObject(gl3);
programObject.attachVertexShader(gl3, shadersFilepath + "MatrixPerspective_VS.glsl");
programObject.attachFragmentShader(gl3, shadersFilepath + "StandardColor_FS.glsl");
programObject.initializeProgram(gl3, true);
System.out.println("ok");
}
private void initializeVertexBuffer(GL3 gl3) {
gl3.glGenBuffers(1, IntBuffer.wrap(vertexBufferObject));
gl3.glBindBuffer(GL3.GL_ARRAY_BUFFER, vertexBufferObject[0]);
{
gl3.glBufferData(GL3.GL_ARRAY_BUFFER, vertexData.length * 4, GLBuffers.newDirectFloatBuffer(vertexData), GL3.GL_STATIC_DRAW);
}
gl3.glBindBuffer(GL3.GL_ARRAY_BUFFER, 0);
gl3.glGenBuffers(1, IntBuffer.wrap(indexBufferObject));
gl3.glBindBuffer(GL3.GL_ELEMENT_ARRAY_BUFFER, indexBufferObject[0]);
{
gl3.glBufferData(GL3.GL_ELEMENT_ARRAY_BUFFER, indexData.length * 4, GLBuffers.newDirectIntBuffer(indexData), GL3.GL_STATIC_DRAW);
}
gl3.glBindBuffer(GL3.GL_ELEMENT_ARRAY_BUFFER, 0);
}
private void initializeProgram(GL3 gl3) {
buildShaders(gl3);
programObject.bind(gl3);
{
float fzNear = 0.5f;
float fzFar = 3.0f;
perspectiveMatrix[0] = fFrustumScale;
perspectiveMatrix[5] = fFrustumScale;
perspectiveMatrix[10] = (fzFar + fzNear) / (fzNear - fzFar);
perspectiveMatrix[14] = (2 * fzFar * fzNear) / (fzNear - fzFar);
perspectiveMatrix[11] = -1.0f;
int matrixLocation = gl3.glGetUniformLocation(programObject.getProgId(), "perspectiveMatrix");
gl3.glUniformMatrix4fv(matrixLocation, 1, false, perspectiveMatrix, 0);
}
programObject.unbind(gl3);
}
private void initializeVertexArrayObjects(GL3 gl3) {
int colorDataOffset;
int positionDataOffset;
gl3.glGenVertexArrays(1, IntBuffer.wrap(VAOs));
gl3.glBindVertexArray(VAOs[0]);
gl3.glBindBuffer(GL3.GL_ARRAY_BUFFER, vertexBufferObject[0]);
{
// 2 objects * 18 vertices * 3 coordinate * 4 Bytes/Float
// colorDataOffset = 2 * 18 * 3 * 4;
colorDataOffset = 3 * 4 * 4;
gl3.glEnableVertexAttribArray(0);
gl3.glEnableVertexAttribArray(1);
{
gl3.glVertexAttribPointer(0, 4, GL3.GL_FLOAT, false, 0, 0);
gl3.glVertexAttribPointer(1, 4, GL3.GL_FLOAT, false, 0, colorDataOffset);
}
gl3.glDisableVertexAttribArray(0);
gl3.glDisableVertexAttribArray(1);
gl3.glBindBuffer(GL3.GL_ELEMENT_ARRAY_BUFFER, indexBufferObject[0]);
}
gl3.glBindVertexArray(0);
}
public GLCanvas getCanvas() {
return canvas;
}
public void setCanvas(GLCanvas canvas) {
this.canvas = canvas;
}
}
我试图尽可能地减少它（最初它使用了更多的顶点和另一个VAO）。 glsl程序使用了我经常使用的外部类，它应该没问题。好的也应该是顶点和片段着色器，来自另一个例子。如果错误看起来不在这里，我会粘贴其余的。 我没有得到任何错误，只是一个空白的屏幕.. 如果我注释掉显示中的线条（），我可以看到三角形..
有什么想法吗？
答案 0 :(得分：0)
发现，当我初始化VAO时，我首先启用顶点属性，然后禁用它们。
但我不应该禁用，因为这将存储在VAO状态......