/**
* Initialize this GLRuntimeCapabilities from the specified {@link javax.media.opengl.GLContext}. The context's
* runtime GL capabilities are examined, and the properties of this GLRuntimeCapabilities are modified accordingly.
* Invoking initialize() may change any property of this GLRuntimeCapabilities, except the caller specified enable
* flags: is[Feature]Enabled.
*
* @param glContext the GLContext from which to initialize GL runtime capabilities.
*
* @throws ArgumentException if the glContext is null.
*/
public void initialize(GLContext glContext)
{
if (glContext == null)
{
String message = Logging.getMessage("nullValue.GLContextIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
GL gl = glContext.getGL();
if (this.glVersion < 1.0)
{
String s = gl.glGetString(GL.GL_VERSION);
if (s != null)
{
s = s.substring(0, 3);
Double d = WWUtil.convertStringToDouble(s);
if (d != null)
{
this.glVersion = d;
}
}
}
// Determine whether or not the OpenGL implementation is provided by the VMware SVGA 3D driver. This flag is
// used to work around bugs and unusual behavior in the VMware SVGA 3D driver. The VMware drivers tested on
// 7 August 2013 report the following strings for GL_VENDOR and GL_RENDERER:
// - GL_VENDOR: "VMware, Inc."
// - GL_RENDERER: "Gallium 0.4 on SVGA3D; build: RELEASE;"
String glVendor = gl.glGetString(GL.GL_VENDOR);
String glRenderer = gl.glGetString(GL.GL_RENDERER);
if (glVendor != null && glVendor.toLowerCase().contains("vmware") &&
glRenderer != null && glRenderer.toLowerCase().contains("svga3d"))
{
this.isVMwareSVGA3D = true;
}
this.isAnisotropicTextureFilterAvailable = gl.isExtensionAvailable(GL_EXT_TEXTURE_FILTER_ANISOTROPIC_STRING);
this.isFramebufferObjectAvailable = gl.isExtensionAvailable(GL_EXT_FRAMEBUFFER_OBJECT_STRING);
// Vertex Buffer Objects are supported in version 1.5 or greater only.
this.isVertexBufferObjectAvailable = this.glVersion >= 1.5;
if (this.depthBits == 0)
{
int[] parameters = new int[1];
gl.glGetIntegerv(GL.GL_DEPTH_BITS, parameters, 0);
this.depthBits = parameters[0];
}
// Texture max anisotropy defaults to -1. A value less than 2.0 indicates that this graphics context does not
// support texture anisotropy.
if (this.maxTextureAnisotropy < 0)
{
// Documentation on the anisotropic texture filter is available at
// http://www.opengl.org/registry/specs/EXT/texture_filter_anisotropic.txt
if (this.isAnisotropicTextureFilterAvailable)
{
// The maxAnisotropy value can be any real value. A value less than 2.0 indicates that the graphics
// context does not support texture anisotropy.
float[] parameters = new float[1];
gl.glGetFloatv(GL.GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, parameters, 0);
this.maxTextureAnisotropy = parameters[0];
}
}
if (this.numTextureUnits == 0)
{
int[] parameters = new int[1];
gl.glGetIntegerv(GL2.GL_MAX_TEXTURE_UNITS, parameters, 0);
this.numTextureUnits = parameters[0];
}
if (this.maxTextureSize == 0)
{
int[] parameters = new int[1];
gl.glGetIntegerv(GL.GL_MAX_TEXTURE_SIZE, parameters, 0);
this.maxTextureSize = parameters[0];
}
}