從VBO/Shader/MVP矩陣使用OpenGL 3.3亂碼三角形

Question

在較早的GLSL版本上繪製一個常規的VBO不是問題，但無論什麼原因，當使用GLSL 3.3時我會得到這個結果。

它應該在每個軸上繪製一個2x2平面。

（較淺的顏色更接近遠平面，顏色較深的更接近近平面）

其中一個重大變化3.3是，你必須提供與您的模型視圖投影矩陣的制服，而不是使用舊的提供的。

我不知道我在做什麼錯，但我幾乎可以肯定這是與模型視圖投影數據有關。這是相關的代碼。

主拉制法

float r = 0.0f; 
void display() { 
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Set background color to black and opaque 
    glClear(GL_COLOR_BUFFER_BIT);   // Clear the color buffer 
    glClear(GL_DEPTH_BUFFER_BIT);   // And the depth buffer 

    r += 0.001f; 

    glUseProgram(program); 
    glEnable(GL_DEPTH_TEST); 

    GLuint uniformModel = glGetUniformLocation(program, "model"); 
    GLuint uniformView = glGetUniformLocation(program, "view"); 
    GLuint uniformProjection = glGetUniformLocation(program, "projection"); 

    glm::mat4 projection = glm::perspective(70.0f, 1.0f, 0.0f, 16.0f); 
    glUniformMatrix4fv(uniformProjection, 1, GL_FALSE, glm::value_ptr(projection)); 

    glm::vec3 eye = glm::vec3(sin(r*0.33)*5.0f,5,cos(r*0.33)*5.0f); 
    glm::vec3 center = glm::vec3(0.0f,0.0f,0.0f); 
    glm::vec3 up = glm::vec3(0.0f,0.0f,1.0f); 

    glm::mat4 view = glm::lookAt(eye, center, up); 
    glUniformMatrix4fv(uniformView, 1, GL_FALSE, glm::value_ptr(view)); 

    glm::mat4 model = glm::translate(glm::mat4(1.0f), glm::vec3(0.0f,0.0f,0.0f)); 

    glUniformMatrix4fv(uniformModel, 1, GL_FALSE, glm::value_ptr(model)); 


    glEnableVertexAttribArray(0); 
    glBindBuffer(GL_ARRAY_BUFFER, vbo); 
    glVertexAttribPointer(
      0, 
      3,  
      GL_FLOAT, 
      GL_FALSE, 
      0, 
      (void*)0 
    ); 

    glDrawElements(GL_TRIANGLES, 18, GL_UNSIGNED_INT, indices); 

    glDisableVertexAttribArray(0); 

    glDisable(GL_DEPTH_TEST); 
    glUseProgram(0); 

    glFlush(); // Render now 
} 

頂點/指數陣列&着色

string vert 
     = "#version 330 core\n" 
     "layout(location = 0) in vec3 vertex;\n" 
     "uniform mat4 model;\n" 
     "uniform mat4 view;\n" 
     "uniform mat4 projection;\n" 
     "void main(){\n" 
     " gl_Position = projection * view * model * vec4(vertex,1.0f);\n" 
     "}"; 
string frag 
     = "#version 330 core\n" 
     "out vec3 color;\n" 
     "void main()\n" 
     "{\n" 
     " float lin = 1.0/gl_FragCoord.w;\n" 
     " float depth = (lin - 0.1)/(16.0 - 0.1);\n" 
     " color = vec3(depth,depth,1.0f);\n" 
     "}"; 

float* data = new float[36] { 
    -1.0f,-1.0f,0.0f, 
    1.0f,-1.0f,0.0f, 
    1.0f,1.0f,0.0f, 
    -1.0f,1.0f,0.0f, 
    0.0f,-1.0f,-1.0f, 
    0.0f,1.0f,-1.0f, 
    0.0f,1.0f,1.0f, 
    0.0f,-1.0f,1.0f, 
    -1.0f,0.0f,-1.0f, 
    1.0f,0.0f,-1.0f, 
    1.0f,0.0f,1.0f, 
    -1.0f,0.0f,1.0f 
}; 

GLuint* indices = new GLuint[18] { 
    0,1,2, 
    0,3,2, 
    4,5,6, 
    4,7,6, 
    8,9,10, 
    8,11,10 
}; 

初始化

const int winSize = 1024; 
void glInit(int argc, char** argv) { 
    glutInit(&argc, argv); 
    glutInitDisplayMode(GLUT_SINGLE); 
    glutInitContextVersion(3,3); 
    //glutInitContextFlags(GLUT_CORE_PROFILE | GLUT_DEBUG); 
    glutInitWindowSize(winSize, winSize); 
    glutInitWindowPosition(25, 25); 
    glutCreateWindow("Loading..."); 
    glewExperimental = GL_TRUE; 
    glewInit(); 
    glViewport (0, 0, winSize, winSize); 
    camera.setPosition(0.0f,0.0f,4.0f); 

    glGenVertexArrays(1, &vba); 
    glBindVertexArray(vba); 

    program = compileShader(vert, frag); 

    GLuint vbo; 
    glGenBuffers(1, &vbo); 
    glBindBuffer(GL_ARRAY_BUFFER, vbo); 
    glBufferData(GL_ARRAY_BUFFER, 3*4*3*4, data, GL_STATIC_DRAW);  


    glEnable(GL_DEPTH_TEST); 
    while(!bExit) { 
     string pre; 
     pre.assign("Test Program - "); 
     pre.append(std::to_string(fps)); 
     glutSetWindowTitle(pre.c_str()); 
     frames++; 
     display(); 
    } 
} 

Answer 1

原來我是個白癡，這只是一種錯誤的錯誤。

我在init方法中定義了GLuint vbo，並且也在程序範圍內，但vbo的實際值只能放入局部變量中。 display（）完全不具有vbo的可見性。

GLuint vbo; 
glGenBuffers(1, &vbo); 
glBindBuffer(GL_ARRAY_BUFFER, vbo); 

它總是引起荒謬的錯誤的小事情。 < _>