精灵批次只绘制第一个精灵

我已经实现了一个OpenGL精灵批处理，但是当对多个精灵使用相同的纹理时，它只绘制第一个精灵。例如：如果我使用它来渲染字符串"Hello"的字形，它只会渲染"H"。

我的着色器非常简单：

片段：

#version 150 core
uniform sampler2D tex;
in vec2 Texcoord;
out vec4 outColor;
void main()
{
    outColor = texture(tex, Texcoord); 
}

顶点：

#version 150 core
in vec3 position;
in vec2 texCoords;
out vec2 Texcoord;
void main()
{
    Texcoord = texCoords;
    gl_Position = vec4(position, 1.0f);
}

它们编译、链接和验证没有任何错误。

我的精灵批处理代码也非常简单。以下是我初始化精灵批处理的方法：

glGenVertexArrays(1, &mVao);
glBindVertexArray(mVao);
    // INDEX BUFFER
glGenBuffers(1, &mEbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mEbo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 0, NULL, GL_STREAM_DRAW);
    // VERTEX BUFFER
glGenBuffers(1, &mVbo);
glBindBuffer(GL_ARRAY_BUFFER, mVbo);
glBufferData(GL_ARRAY_BUFFER, 0, NULL, GL_STREAM_DRAW);
    // POS ATTRIB
GLint posAttrib;
posAttrib = glGetAttribLocation(mShader.getProgram(), "position");
glEnableVertexAttribArray(posAttrib);
glVertexAttribPointer(posAttrib, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), 0);
    // TEX ATTRIB
GLint texAttrib;
texAttrib = glGetAttribLocation(mShader.getProgram(), "texCoords");
glEnableVertexAttribArray(texAttrib);
glVertexAttribPointer(texAttrib, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));

最后，这是我的画法：

glBindVertexArray(mVao);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mEbo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), &indices[0], GL_STREAM_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, mVbo);
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STREAM_DRAW);
glDrawElements(GL_TRIANGLES, (GLsizei)indices.size(), GL_UNSIGNED_INT, 0);
glBindVertexArray(0);

据我所知，OpenGL不会抛出任何错误，vertices和indices包含正确的数据。

我很抱歉代码量，但由于我没有收到任何错误，所以我不知道它在哪里出错。当我调试代码时，我没有看到不合适或错误的值。

编辑

我用来设置顶点和索引向量的代码是这样的：

for(int i = 0; i < currentSprites.size(); ++i)
{
   Sprite* current = currentSprites.at(i);
    // 4 * (2 (pos) + 2 (tex))
    float verticesArray[16] =
    {
         // TOP LEFT
         current->x,
         current->y,
         (float)current->textureRect.x / (float)current->texture.w,
         (float)current->textureRect.y / (float)current->texture.h,
         // TOP RIGHT
         current->x + current->w,
         current->y,
         (float)(current->textureRect.x + current->textureRect.w) / (float)current->texture.w,
         (float)current->textureRect.y / (float)current->texture.h,
         // BOTTOM RIGHT
         current->x + current->w,
         current->y + current->h,
         (float)(current->textureRect.x + current->textureRect.w) / (float)current->texture.w,
         (float)(current->textureRect.y + current->textureRect.h) / (float)current->texture.h,
         // BOTTOM LEFT
         current->x,
         current->y + current->h,
         (float)current->textureRect.x / (float)current->texture.w,
         (float)(current->textureRect.y + current->textureRect.h) / (float)current->texture.h
    };
    for(int v = 0; v < 16; v += 4)
    {
        float zPos = -(float)current->layer / 100.0f;
        // Projection matrix
        glm::vec4 result = mCamera.getProjectionMatrix() * glm::vec4(verticesArray[v], verticesArray[v+1], zPos, 1.0f); // This is just an orthographic projection matrix
        verticesArray[v] = result.x;
        verticesArray[v+1] = result.y;
        zPos = result.z;
        vertices.push_back(Vertex(glm::vec3(verticesArray[v], verticesArray[v + 1], zPos),
                                  glm::vec2(verticesArray[v + 2], verticesArray[v + 3])));
    }
    static GLuint _indices[6] =
    {
    0, 1, 3, 3, 1, 2
    };
    for(int index = 0; index < 6; ++index)
    {
        indices.push_back(_indices[index]);
    }
}