当我在Mac上尝试为我的应用程序编译GLSL着色器时，它会因着色器的版本冲突错误而失败：
Error compiling vertex shader:
ERROR: 0:1: '' : version '130' is not supported
Error compiling shader:
ERROR: 0:1: '' : version '130' is not supported
着色器如下所示：
顶点着色器：
#version 130
in vec2 in_vPos;
in vec2 in_vTexCoord;
out vec2 s_vTexCoord;
void main()
{
gl_Position = vec4(in_vPos, 0, 1);
s_vTexCoord = (in_vTexCoord + vec2(1, 1)) / 2;
}
片元着色器：
#version 130
in vec2 s_vTexCoord;
out vec4 s_colOut;
uniform sampler2DRect s_texSampler;
uniform vec4 s_colBlend;
void main()
{
vec4 pixel = texture(s_texSampler, s_vTexCoord * textureSize(s_texSampler));
s_colOut = s_colBlend * pixel;
}
这是我如何初始化SDL渲染器和Glew的方法：
ren_pRenderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);
glEnable(GL_MULTISAMPLE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE | SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "1");
static bool _bInitializedGlew = false;
if(!_bInitializedGlew) {
glewExperimental = GL_TRUE;
GLenum err = glewInit();
if(err != GLEW_OK) {
printf("Glew initialization error: %d\n", err);
}
_bInitializedGlew = true;
}
这是我编译着色器的方法：
unsigned int CShader::CompileShader(const char* str, int type, bool &bSuccess)
{
// create a new shader
GLuint iShader = glCreateShader(type);
const GLchar* aSourceVertex[] = { str };
glShaderSource(iShader, 1, aSourceVertex, NULL);
glCompileShader(iShader);
// check if compiling went okay
GLint bShaderCompiled = GL_FALSE;
glGetShaderiv(iShader, GL_COMPILE_STATUS, &bShaderCompiled);
if(bShaderCompiled != GL_TRUE) {
// it did not.
printf("Error compiling %sshader:\n", (type == GL_VERTEX_SHADER ? "vertex " : ""));
int iLogLength = 0;
int iMaxLength = 0;
glGetShaderiv(iShader, GL_INFO_LOG_LENGTH, &iMaxLength);
char* buffer = new char[iMaxLength];
glGetShaderInfoLog(iShader, iMaxLength, &iLogLength, buffer);
if(iLogLength > 0) {
printf("%s\n", buffer);
}
delete[] buffer;
// report it back
bSuccess = false;
// and delete the shader
glDeleteShader(iShader);
} else {
// it worked!
bSuccess = true;
}
// return shader
return iShader;
}
我之前寻找答案却找不到令人信服的Stackoverflow答案来帮助我，尽管它通过SDL_GL_SetAttribute指导我朝着正确的方向设置了GL版本和核心配置文件。因此，在以上代码中，我将其设置为3.1 Core，根据维基百科所述，是#version 140，但即使我使用它，我仍然会得到相同的错误：
Error compiling vertex shader:
ERROR: 0:1: '' : version '140' is not supported
Error compiling shader:
ERROR: 0:1: '' : version '140' is not supported
编辑：我将属性中的版本更改为3.2 Core + Forward Compat，并且现在使用#version 150时，我遇到了相同的问题，说不支持150。
当我打印glGetString(GL_SHADING_LANGUAGE_VERSION)的结果时，我得到1.20。
即使我在创建SDL窗口之后明确创建上下文，它仍然报告1.20：
win_pWindow = SDL_CreateWindow(strTitle, iX, iY, width, height, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN | ulFlags);
win_pContext = SDL_GL_CreateContext(win_pWindow);
printf("GLSL version: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION));