c++ - OpenGL 顶点缓冲区对象不显示

Question

我已将 3 个 GLFloat 数组(又名 GLfloat[])更改为 vector (又名 vector )，但我的三角形停止工作了!这是我的初始化函数:

void initialize(GLuint &vao) {

// Use a Vertex Array Object
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);

Projection = perspective(45.0f, 16.0f / 9.0f, 0.1f, 100.0f);
//ortho(-4.0f/3.0f, 4.0f/3.0f, -1.0f, 1.0f, -1.0f, 1.0f);
Model = translate(Model, vec3(0.f, 0.f, 0.f));
Model = rotate(Model, 45.0f, vec3(0.0f, 0.0f, 1.0f));

//pos + textures array
GLuint vboId;
glGenBuffers(1, &vboId);
glBindBuffer(GL_ARRAY_BUFFER, vboId);
glBufferData(GL_ARRAY_BUFFER, (vertices_position.size() + texture_coord.size() ) * sizeof(GLfloat), NULL, GL_DYNAMIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, vertices_position.size() * sizeof(GLfloat), &vertices_position[0]);
glBufferSubData(GL_ARRAY_BUFFER, vertices_position.size() * sizeof(GLfloat), texture_coord.size() * sizeof(GLfloat), &texture_coord[0]);

//Indices
GLuint eabId;
glGenBuffers(1, &eabId);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, eabId);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLfloat), &indices[0], GL_DYNAMIC_DRAW);

//Textures
GLuint textureId;
glGenTextures(1, &textureId);
glBindTexture(GL_TEXTURE_2D, textureId);
load_image("../squirrel.jpg");

shaderProgram = create_program("../shaders/vert.shader", "../shaders/frag.shader");

//Position attribute
positionAttrId = glGetAttribLocation(shaderProgram, "position");
glVertexAttribPointer(positionAttrId, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(positionAttrId);

//Texture attribute
textureCoordId = glGetAttribLocation(shaderProgram, "texture_coord");
glVertexAttribPointer(textureCoordId, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid *)(vertices_position.size() * sizeof(GLfloat)));
glEnableVertexAttribArray(textureCoordId);

modelId = glGetUniformLocation(shaderProgram, "Model");
cameraId = glGetUniformLocation(shaderProgram, "Camera");
}

下面是我的渲染函数:

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glUseProgram(shaderProgram);

glUniformMatrix4fv(modelId, 1, GL_FALSE, glm::value_ptr(Model));
glUniformMatrix4fv(cameraId, 1, GL_FALSE, glm::value_ptr(cam.matrix()));

//VAO
glBindVertexArray(vao);
//glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);

glUseProgram(0);

Answer 1

您在索引缓冲区对象中使用浮点元素，这不是有效的数据类型。

OpenGL 需要 GLubyte (大多数桌面 GPU 上没有硬件加速)，GLushort或 GLuint指数。

为了获得最佳性能，您应该使用 GLushort 的数组并通过 GL_UNSIGNED_SHORT作为您对 glDrawElements (...) 的调用中的元素类型.