Bdtjtk

I tried to use GLSL 3.3 but the system indicates the supported version is 1.2.

I tried to use SDL_GL_SetAttribute to set major and minor version but glGetString(GL_SHADING_LANGUAGE_VERSION) was still 1.2.

I'm not sure what's wrong with my code. Any help would be appreciated!

#include <iostream>

#include <GL/glew.h>

#include <GLFW/glfw3.h>

#include <SDL2/SDL.h>



unsigned int CompileShader(unsigned int type, const std::string& source)

{

    unsigned int id = glCreateShader(type);

    const char* src = source.c_str();

    glShaderSource(id, 1, &src, nullptr);

    glCompileShader(id);



    int result;

    glGetShaderiv(id, GL_COMPILE_STATUS, &result);

    if (result != GL_TRUE)

    {

        int length;

        glGetShaderiv(id, GL_INFO_LOG_LENGTH, &length);

        char* message = (char*)alloca(length * sizeof(char));

        glGetShaderInfoLog(id, length, &length, message);

        std::cout << "Fail to compile " << (type == GL_VERTEX_SHADER ? "vertex" : "fragment") <<

            " shader!" << std::endl;

        printf("Supported GLSL version is %s.n", (char *)glGetString(GL_SHADING_LANGUAGE_VERSION));

        std::cout << message << std::endl;

        return 0;

    }



    return id;

}





static unsigned int CreateShader(const std::string& vertexShader, const std::string& fragmentShader)

{...}





int main(void)

{

    SDL_Init(SDL_INIT_EVERYTHING);

    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);

    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);

    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);



    // init window, context

    // balabala



    std::string vertexShader = 

        "#version 330 coren"

        "n"

        "layout (location = 0) in vec4 position;n"

        "n"

        "void main()n"

        "{n"

        "   gl_position = position;n"

        "}n";



    std::string fragmentShader = 

        "#version 330 coren"

        "n"

        "layout (location = 0) out vec4 color;n"

        "n"

        "void main()n"

        "{n"

        "   color = vec4(1.0,0.0,0.0,1.0);n"

        "}n";





    unsigned int shader = CreateShader(vertexShader, fragmentShader);

    glUseProgram(shader);



    // Loop until the user closes the window

    // balabala



    SDL_Quit();

    return 0;

}

And below is the outputted error message:

@"Fail to compile vertex shader!rn"

@"Supported GLSL version is 1.20.rn"

@"ERROR: 0:1: '' :  version '330' is not supportedrn"

@"ERROR: 0:1: '' : syntax error: #versionrn"

@"ERROR: 0:3: 'layout' : syntax error: syntax errorrn"

@"rn"

@"Fail to compile fragment shader!rn"

@"Supported GLSL version is 1.20.rn"

@"ERROR: 0:1: '' :  version '330' is not supportedrn"

@"ERROR: 0:1: '' : syntax error: #versionrn"

@"ERROR: 0:3: 'layout' : syntax error: syntax errorrn"

@"rn"

Thanks!