Question

所以我基本上是OpenGL的初学者，我试图创建自己的着色器以形成一个简单的三角形。在此过程中，尽管本教程使用glfw3并感到高兴（我不得不求助于SDL，因为我无法有效地包含该窗口），但我还是使用SDL创建了一个窗口（如附件屏幕截图中所示，窗口已成功加载）。后一个库）。它不断给我以下错误

“不支持GLSL。受支持的版本为：1.10、1.20、1.30，... 3.20 ES”

SDL是问题的原因吗？

操作系统：Ubuntu 18.04; IDE：CodeBlocks；

main.cpp

#include <iostream>
#include <SDL2/SDL.h>
#include <GL/glew.h>
#include "display.h"

using namespace std;
const char *vertexShaderSource = "#version 330 core\n"
    "layout (location = 0) in vec3 aPos;\n"
    "void main()\n"
    "{\n"
        "gl_Position = vec4(aPos.x,aPos.y,aPos.z,1.0f)\n"
    "}\0";
const char *fragmentShaderSource = "#version 330 core\n"
    "out vec4 FragColor;\n"
    "void main()\n"
    "{\n"
        "FragColor = vec4(1.0f,0.5f,0.2f,1.0f);\n"
    "}\0";
int main()
{
    Display display(800,600,"Moiz");
    while(!display.isClosed())
    {
        glClearColor(0.0f,0.15f,0.3f,1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        display.Update();
        int vertexShader = glCreateShader(GL_VERTEX_SHADER);
        glShaderSource(vertexShader, 1 , &vertexShaderSource, NULL);
        glCompileShader(vertexShader);
        int success;
        char infoLog[512];
        glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
        if (!success)
        {
            glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
            std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
        }
        int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
        glShaderSource(fragmentShader, 1, &fragmentShaderSource,NULL);
        glCompileShader(fragmentShader);
        glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
        if (!success)
        {
            glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
            std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
        }
    }
    return 0;
}

Display.cpp

#include <iostream>
#include <string>
#include <SDL2/SDL.h>
#include <GL/glew.h>
#include "display.h"

using namespace std;

Display::Display(int width, int height,const string &title)
{
    SDL_Init(SDL_INIT_EVERYTHING);


    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32);
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

    m_window = SDL_CreateWindow(title.c_str(),SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,width,height,SDL_WINDOW_OPENGL);
    m_glContext = SDL_GL_CreateContext(m_window);
    GLenum status = glewInit();
    if(status != GLEW_OK)
    {
        std::cerr << "GLEW FAILED TO INITIALIZE" << endl;
    }
}
bool Display::isClosed(){
    return m_isClosed;
}
void Display::Update()
{
    SDL_GL_SwapWindow(m_window);
    SDL_Event e;
    while(SDL_PollEvent(&e))
    {
        if(e.type == SDL_QUIT)
        {
            m_isClosed = true;
        }
    }
}

Display::~Display()
{
    SDL_GL_DeleteContext(m_glContext);
    SDL_DestroyWindow(m_window);
    SDL_Quit();
}

Display::Display(const Display& other)
{
    //copy ctor
}

Display& Display::operator=(const Display& rhs)
{
    if (this == &rhs) return *this; // handle self assignment
    //assignment operator
    return *this;
}

：错误图片

Error Screenshot

Answer 1

您在顶点着色器中的Content-Length之后缺少分号
如果您使用的是Mesa，请注意（从历史上看；在过去的几周/几个月中，这种变化已在某些驱动程序中有所改变），如果您请求Core上下文，则只会分发GL上下文> 3.0。您可以使用vec4发出SDL_GL_SetAttribute()一个请求：
```
SDL_CreateWindow()
```

一起（这就是MCVE的意思：一个文件，仅取决于SDL / GLEW / GLM / GLFW等知名库）：

SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 3 );
SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 3 );
SDL_GL_SetAttribute( SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE );

此外，请确保检查#include <iostream> #include <SDL2/SDL.h> #include <GL/glew.h> #include <iostream> #include <string> class Display { public: Display( int width, int height, const std::string &title ) : m_isClosed( false ) { SDL_Init( SDL_INIT_EVERYTHING ); SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_BUFFER_SIZE, 32 ); SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 3 ); SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 3 ); SDL_GL_SetAttribute( SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE ); m_window = SDL_CreateWindow ( title.c_str(), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_OPENGL ); m_glContext = SDL_GL_CreateContext( m_window ); GLenum status = glewInit(); if( status != GLEW_OK ) { std::cerr << "GLEW FAILED TO INITIALIZE" << std::endl; } } bool isClosed() { return m_isClosed; } void Update() { SDL_GL_SwapWindow( m_window ); SDL_Event e; while( SDL_PollEvent( &e ) ) { if( e.type == SDL_QUIT ) { m_isClosed = true; } } } ~Display() { SDL_GL_DeleteContext( m_glContext ); SDL_DestroyWindow( m_window ); SDL_Quit(); } Display( const Display& other ) { //copy ctor } Display& operator=( const Display& rhs ) { if( this == &rhs ) return *this; // handle self assignment //assignment operator return *this; } private: SDL_Window* m_window; SDL_GLContext m_glContext; bool m_isClosed; }; const char *vertexShaderSource = "#version 330 core\n" "layout (location = 0) in vec3 aPos;\n" "void main()\n" "{\n" "gl_Position = vec4(aPos.x,aPos.y,aPos.z,1.0f);\n" "}\0"; const char *fragmentShaderSource = "#version 330 core\n" "out vec4 FragColor;\n" "void main()\n" "{\n" "FragColor = vec4(1.0f,0.5f,0.2f,1.0f);\n" "}\0"; int main( int argc, char** argv ) { Display display( 800, 600, "Moiz" ); while( !display.isClosed() ) { glClearColor( 0.0f, 0.15f, 0.3f, 1.0f ); glClear( GL_COLOR_BUFFER_BIT ); display.Update(); int vertexShader = glCreateShader( GL_VERTEX_SHADER ); glShaderSource( vertexShader, 1, &vertexShaderSource, NULL ); glCompileShader( vertexShader ); int success; char infoLog[ 512 ]; glGetShaderiv( vertexShader, GL_COMPILE_STATUS, &success ); if( !success ) { glGetShaderInfoLog( vertexShader, 512, NULL, infoLog ); std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl; } int fragmentShader = glCreateShader( GL_FRAGMENT_SHADER ); glShaderSource( fragmentShader, 1, &fragmentShaderSource, NULL ); glCompileShader( fragmentShader ); glGetShaderiv( fragmentShader, GL_COMPILE_STATUS, &success ); if( !success ) { glGetShaderInfoLog( fragmentShader, 512, NULL, infoLog ); std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl; } } return 0; }和SDL_CreateWindow()返回有效值。

不支持GLSL 330内核

1 个答案: