Opengl程序无法识别第二个顶点输入

Question

我在阅读着色器和颜色，他们如何将它们定义为顶点输入。所以我folowed教程，并用混乱来是因为该方案只是读向前看，而不是进入下一行：

GLfloat vertecies[] = { 
    //vertices    colors 
    0.5f, -0.5f, 0.0f,  1.0f, 0.0f, 0.0f,// Bottom Right 
    -0.5f, -0.5f, 0.0f,  0.0f, 1.0f, 0.0f,// Bottom Left 
    0.0f, 0.5f, 0.0f,  0.0f, 0.0f, 1.0f,// Top 
}; 

而这里的下面的代码，这应该是设置第二个顶点输入的颜色：

glBindVertexArray(VAO); 
glBindBuffer(GL_ARRAY_BUFFER, VBO); 
glBufferData(GL_ARRAY_BUFFER, sizeof(vertecies), vertecies, GL_STATIC_DRAW); 

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO); 
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(index), index, GL_STATIC_DRAW); 

glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (GLvoid*)0); 
glEnableVertexAttribArray(0); 

glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat))); 
glEnableVertexAttribArray(1); 

glBindVertexArray(0); 

这是我的顶点着色器代码：

const char* VertexShaderCode = 
"#version 330 core\r\n" 
"" 
"layout(location=0) in vec3 position;" 
"layout(location=1) in vec3 color;" 
"" 
"out vec3 theColor;" 
"" 
"void main()" 
"{" 
" gl_Position = vec4(position, 1.0);" 
" theColor = color;" 
"}"; 

而这里的片段着色器代码：

const char* FragmentShaderCode = 
"#version 330 core\r\n" 
"" 
"in vec3 theColor;" 
"" 
"out vec4 color;" 
"" 
"void main()" 
"{" 
" color = theColor;" 
"}"; 

告诉我，如果我做错了什么。

Answer 1

您的步幅乘数对于属性索引0是错误的。它应该是6，因为一个顶点包含3个位置元素和3个颜色元素。更换

glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (GLvoid*)0); 

与

glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0);