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Backends: OpenGL3: Fixed loader compatibility with GL_VERSION for GL 2.x (#6154, #4445, #3530)

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GL_MAJOR_VERSION and GL_MINOR_VERSION are available on GL 3.0 and above.
So we have to parse GL_VERSION under GL 2.x
Reference https://www.khronos.org/opengl/wiki/OpenGL_Context#Context_information_queries
Regressed since 459de65477
See https://github.com/ocornut/imgui/pull/3530
This commit is contained in:
Laurens Holst
2023-02-09 21:56:04 +01:00
committed by ocornut
parent fa0852f9e5
commit b0c1816664
2 changed files with 10 additions and 3 deletions
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10
backends/imgui_impl_opengl3_loader.h
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@ -685,7 +685,13 @@ static int parse_version(void)
return GL3W_ERROR_INIT;
glGetIntegerv(GL_MAJOR_VERSION, &version.major);
glGetIntegerv(GL_MINOR_VERSION, &version.minor);
if (version.major < 3)
if (version.major == 0 && version.minor == 0)
{
// Query GL_VERSION in desktop GL 2.x, the string will start with "<major>.<minor>"
const char* gl_version = (const char*)glGetString(GL_VERSION);
sscanf(gl_version, "%d.%d", &version.major, &version.minor);
}
if (version.major < 2)
return GL3W_ERROR_OPENGL_VERSION;
return GL3W_OK;
}
@ -709,7 +715,7 @@ int imgl3wInit2(GL3WGetProcAddressProc proc)
int imgl3wIsSupported(int major, int minor)
{
if (major < 3)
if (major < 2)
return 0;
if (version.major == major)
return version.minor >= minor;