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library_glew.js
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135 lines (115 loc) · 3.98 KB
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/*******************************************************************************
* EMSCRIPTEN GLEW 1.10.0 emulation
*
* What it does:
* - Stubs init function.
* - GL Extensions support.
*
* Optional:
* - isLinaroFork variable to enable glew-es specific error strings.
* This is enabled by default, but should be disabled when upstream glew conflicts.
*
* Authors:
* - Jari Vetoniemi <mailroxas@gmail.com>
******************************************************************************/
var LibraryGLEW = {
$GLEW__deps: ['glGetString'],
$GLEW: {
isLinaroFork: 1,
extensions: null,
error: {
0:null, // GLEW_OK || GLEW_NO_ERROR
1:null, // GLEW_ERROR_NO_GL_VERSION
2:null, // GLEW_ERROR_GL_VERSION_10_ONLY
3:null, // GLEW_ERROR_GLX_VERSION_11_ONLY
4:null, // GLEW_ERROR_NOT_GLES_VERSION
5:null, // GLEW_ERROR_GLES_VERSION
6:null, // GLEW_ERROR_NO_EGL_VERSION
7:null, // GLEW_ERROR_EGL_VERSION_10_ONLY
8:null, // Unknown error
},
version: {
1:null, // GLEW_VERSION
2:null, // GLEW_VERSION_MAJOR
3:null, // GLEW_VERSION_MINOR
4:null, // GLEW_VERSION_MICRO
},
errorStringConstantFromCode: function(error) {
if (GLEW.isLinaroFork) {
switch (error) {
case 4:return "OpenGL ES lib expected, found OpenGL lib"; // GLEW_ERROR_NOT_GLES_VERSION
case 5:return "OpenGL lib expected, found OpenGL ES lib"; // GLEW_ERROR_GLES_VERSION
case 6:return "Missing EGL version"; // GLEW_ERROR_NO_EGL_VERSION
case 7:return "EGL 1.1 and up are supported"; // GLEW_ERROR_EGL_VERSION_10_ONLY
default:break;
}
}
switch (error) {
case 0:return "No error"; // GLEW_OK || GLEW_NO_ERROR
case 1:return "Missing GL version"; // GLEW_ERROR_NO_GL_VERSION
case 2:return "GL 1.1 and up are supported"; // GLEW_ERROR_GL_VERSION_10_ONLY
case 3:return "GLX 1.2 and up are supported"; // GLEW_ERROR_GLX_VERSION_11_ONLY
default:return null;
}
},
errorString: function(error) {
if (!GLEW.error[error]) {
var string = GLEW.errorStringConstantFromCode(error);
if (!string) {
string = "Unknown error";
error = 8; // prevent array from growing more than this
}
GLEW.error[error] = allocate(intArrayFromString(string), 'i8', ALLOC_NORMAL);
}
return GLEW.error[error];
},
versionStringConstantFromCode: function(name) {
switch (name) {
case 1:return "1.10.0"; // GLEW_VERSION
case 2:return "1"; // GLEW_VERSION_MAJOR
case 3:return "10"; // GLEW_VERSION_MINOR
case 4:return "0"; // GLEW_VERSION_MICRO
default:return null;
}
},
versionString: function(name) {
if (!GLEW.version[name]) {
var string = GLEW.versionStringConstantFromCode(name);
if (!string)
return 0;
GLEW.version[name] = allocate(intArrayFromString(string), 'i8', ALLOC_NORMAL);
}
return GLEW.version[name];
},
extensionIsSupported: function(name) {
if (!GLEW.extensions) {
GLEW.extensions = Pointer_stringify(_glGetString(0x1F03)).split(' ');
}
if (GLEW.extensions.indexOf(name) != -1)
return 1;
// extensions from GLEmulations do not come unprefixed
// so, try with prefix
return (GLEW.extensions.indexOf("GL_" + name) != -1);
},
},
glewInit: function() { return 0; },
glewIsSupported: function(name) {
var exts = Pointer_stringify(name).split(' ');
for (var i in exts) {
if (!GLEW.extensionIsSupported(exts[i]))
return 0;
}
return 1;
},
glewGetExtension: function(name) {
return GLEW.extensionIsSupported(Pointer_stringify(name));
},
glewGetErrorString: function(error) {
return GLEW.errorString(error);
},
glewGetString: function(name) {
return GLEW.versionString(name);
},
};
autoAddDeps(LibraryGLEW, '$GLEW');
mergeInto(LibraryManager.library, LibraryGLEW);