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Refs #358. Added helpers functions to determine opengl version.

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This commit is contained in:
Ignacio Lillo 2015-04-12 16:28:05 -03:00
parent ff8b1c4148
commit 013a333680
1 changed files with 79 additions and 0 deletions
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79
examples/glViewer/glViewer.cpp
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@ -264,6 +264,85 @@ compileShader(GLenum shaderType, const char *source)
return shader;
}
///Helper function that parses the open gl version string, retrieving the major
///and minor version from it.
static void get_major_minor_version(int *major, int *minor){
static bool initialized = false;
int _major = -1, _minor = -1;
if (!initialized || _major == -1 || _minor == -1){
const GLubyte *ver = glGetString(GL_SHADING_LANGUAGE_VERSION);
if (!ver){
_major = -1;
_minor = -1;
}
else{
std::string major_str(ver, ver + 1);
std::string minor_str(ver + 2, ver + 3);
std::stringstream ss;
ss << major_str << " " << minor_str;
ss >> _major;
ss >> _minor;
}
initialized = true;
}
*major = _major;
*minor = _minor;
}
/** Gets the shader version based on the current opengl version and returns
* it in a string form */
const std::string &get_shader_version(){
static bool initialized = false;
static std::string shader_version;
if (!initialized){
int major, minor;
get_major_minor_version(&major, &minor);
int version_number = major * 10 + minor;
switch (version_number){
case 20:
shader_version = "110";
break;
case 21:
shader_version = "120";
break;
case 30:
shader_version = "130";
break;
case 31:
shader_version = "140";
break;
case 32:
shader_version = "150";
break;
default:
std::stringstream ss;
ss << version_number;
shader_version = ss.str() + "0";
break;
}
initialized = true;
}
return shader_version;
}
/* Generates the version defintion needed by the glsl shaders based on the
* opengl string
*/
static const std::string &get_shader_version_include(){
static bool initialized = false;
static std::string include;
if (!initialized){
include = "#version " + get_shader_version() + "\n";
initialized = true;
}
return include;
}
static bool
linkDefaultProgram() {