绘制时VAO和VBO崩溃

Question

当第一次尝试绘制VAOS时，它崩溃了。我画没有着色器（所以它不会引起问题）。

在一个VAO和纹理坐标中最多有12个面(12*3个顶点）。有多达50万个VAO。

我如何创造一张脸：

tData.add(new float[]{textureX + 0.1249f, textureY+ 0.1249f});
vData.add(new float[]{x, y, z});
tData.add(new float[]{textureX+ 0.1249f, textureY+0.0001f});
vData.add(new float[]{x, y+1, z+1});
tData.add(new float[]{textureX+0.0001f, textureY+0.0001f});
vData.add(new float[]{x+1, y+1, z+1});

if(vData.isEmpty())
        return;

    int vaoHandle = glGenVertexArrays();
    glBindVertexArray(vaoHandle);

    int vertexDataSize = vData.size() * 3;
    int textureDataSize = tData.size() * 2;
    FloatBuffer vertexData = BufferUtils.createFloatBuffer(vData.size() * 3);
    FloatBuffer textureData = BufferUtils.createFloatBuffer(tData.size() * 2);

    while(!vData.isEmpty())
    {
        vertexData.put(vData.remove(0));
    }
    while(!tData.isEmpty())
    {
        textureData.put(tData.remove(0));
    }

    vertexData.flip();
    textureData.flip();

    int vertexHandle = glGenBuffers();
    glBindBuffer(GL_ARRAY_BUFFER, vertexHandle);
    glBufferData(GL_ARRAY_BUFFER, vertexData, GL_STATIC_DRAW);
    glVertexAttribPointer(0, vertexDataSize, GL_FLOAT, false, 0, 0);

    int textureHandle = glGenBuffers();
    glBindBuffer(GL_ARRAY_BUFFER, textureHandle);
    glBufferData(GL_ARRAY_BUFFER, textureData, GL_STATIC_DRAW);
    glVertexAttribPointer(1, textureDataSize, GL_FLOAT, false, 0, 0);


    glBindBuffer(GL_ARRAY_BUFFER, 0);
    glBindVertexArray(0);

    renderEngine.vaos.add(new VAO(vaoHandle, (int)((float)vertexDataSize / 3f)));

    glUseProgram(0);//TODO:REMOVE
    for(VAO vao : vaos)
    {
        glBindVertexArray(vao.getHandle());
        glEnableVertexAttribArray(0);
        glEnableVertexAttribArray(1);

        System.out.println(vao.getVertices());//correct numeber
        glDrawArrays(GL_TRIANGLES, 0, vao.getVertices());//<-- CRASH at first time called

        glDisableVertexAttribArray(1);
        glDisableVertexAttribArray(0);
    }
    glBindVertexArray(0);

错误如下：

# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000000b3fb610, pid=7736, tid=6224
#
# JRE version: Java(TM) SE Runtime Environment (8.0_20-b26) (build 1.8.0_20-b26)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.20-b23 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C  [ig75icd64.dll+0x8b610]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Users\Geosearchef\workspaces\workspaceLWJGL\OrangeJuiceVBO\hs_err_pid7736.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

我不认为把整个错误贴在这里是明智的。你知道为什么会这样吗？我找不到任何关于VBOS的错误。

Answer 1

没有正确设置顶点属性指针：

int vertexDataSize = vData.size() * 3;
int textureDataSize = tData.size() * 2;
[...]
glVertexAttribPointer(0, vertexDataSize, GL_FLOAT, false, 0, 0);
[...]
glVertexAttribPointer(1, textureDataSize, GL_FLOAT, false, 0, 0);

size参数定义每个顶点向量中的元素数，并且必须在1到4的范围内。

您的代码只会生成一个GL错误--您应该明确地添加一些错误检查，至少为了调试--并保持属性指针未初始化。