GLSL Shader(编译错误) [英] GLSL Shader (compilation error)

问题描述

我已经阅读了所有推荐的帖子，尝试了这些解决方案，但没有一个提供帮助.

I've read all recommended posts, I've tried those solutions, but non of them helped.

简而言之，问题在于

glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);

此代码有效:

const char *vertexShaderSource = "#version 120 \n"
                         "attribute vec3 pos;\n"
                         "attribute vec2 texCoord;\n"
                         "varying vec2 texCoord0;\n"
                         "uniform mat4 transform;\n"
                         "void main()\n"
                         "{\n"
                         "   gl_Position = transform * vec4(pos, 1.0);\n"
                         "   texCoord0 = texCoord;\n"
                        "}\0";

但是我想从文件中读取它，以下代码可以工作

But I want to read it from a file, following code works

std::string s= "vertex";
std::ifstream file(s.c_str());
std::stringstream buffer;

buffer << file.rdbuf();
std::string str = buffer.str();
std::cout << str; 

并输出:

#version 120
attribute vec3 pos;
attribute vec2 texCoord;
varying vec2 texCoord0;
uniform mat4 transform;

void main()
{
    gl_Position = transform * vec4(pos, 1.0);
    texCoord0 = texCoord;
}

我知道我不能简单地使用以下代码转换字符串:

I know that I cannot just simply convert string with code like this:

const char *vertexShaderSource = str.c_str();

并将其传递给:glShaderSource(vertexShader, 1, &vertexShaderSource, NULL); 因此，我使用了以下代码来防止其停止存在:

And pass it into: glShaderSource(vertexShader, 1, &vertexShaderSource, NULL); So I've used following code to prevent it from ceasing to exist:

char * writable = new char[str.size() + 1];
std::copy(str.begin(), str.end(), writable);
writable[str.size()] = '\0';

通过glShaderSource(vertexShader, 1, &writable, NULL);也不起作用. 我一直都在跟踪错误，即使使用教程

Passing glShaderSource(vertexShader, 1, &writable, NULL);does not work also. I'm getting following error all the time, even with another copy&paste code from tutorials

 0:1(4): preprocessor error: syntax error, unexpected HASH_TOKEN

我还能做什么?

我已阅读以下文章: 从中读取着色器使用结构的.txt文件

I've read these posts: Reading a shader from a .txt file using a structure

从文件中读取GLSL着色器

推荐答案

这是我用来加载着色器源代码:

Here is the code I use to load shader sources:

ifstream iStream(filename);
stringstream buffer;
buffer << iStream.rdbuf();
string source = buffer.str();

const char* sources[] = { source.c_str() };
glShaderSource(handle, 1, sources, 0);

如您所见，string可以直接分配给glShaderSource；无需创建它的副本.看看 c_str() 的规范不相信.

As you can see, the string can be given directly to glShaderSource; there is no need to create a copy of it. Have a look at the spec for c_str() if you're not convinced.

不确定您所遇到的问题是什么.我已经成功使用了\r\n和\n行尾.也许在文件的开头有 U+FEFF BOM字符?可能与编译错误中提到的哈希"有关.

Not sure what the problem is in your case. I have used both \r\n and \n line endings successfully. Maybe you have a U+FEFF BOM character at the start of the file? It could with the the "hash" mentioned in the compilation error.

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