LibGL: Implement `GL_*_BITS` and `GL_DOUBLEBUFFER` parameters

Userland/Libraries/LibGL/GL/gl.h

@@ -79,7 +79,14 @@ extern "C" {
 #define GL_SHADING_LANGUAGE_VERSION 0x8B8C
 
 // Get parameters
+#define GL_DOUBLEBUFFER 0x0C32
 #define GL_MAX_TEXTURE_SIZE 0x0D33
+#define GL_RED_BITS 0x0D52
+#define GL_GREEN_BITS 0x0D53
+#define GL_BLUE_BITS 0x0D54
+#define GL_ALPHA_BITS 0x0D55
+#define GL_DEPTH_BITS 0x0D56
+#define GL_STENCIL_BITS 0x0D57
 #define GL_MAX_TEXTURE_UNITS 0x84E2
 
 // Blend factors

Userland/Libraries/LibGL/SoftwareGLContext.cpp

@@ -1582,6 +1582,9 @@ void SoftwareGLContext::gl_get_booleanv(GLenum pname, GLboolean* data)
     case GL_DEPTH_TEST:
         *data = m_depth_test_enabled ? GL_TRUE : GL_FALSE;
         break;
+    case GL_DOUBLEBUFFER:
+        *data = GL_TRUE;
+        break;
     case GL_CULL_FACE:
         *data = m_cull_faces ? GL_TRUE : GL_FALSE;
         break;
@@ -1683,6 +1686,14 @@ void SoftwareGLContext::gl_get_integerv(GLenum pname, GLint* data)
     case GL_UNPACK_ROW_LENGTH:
         *data = m_unpack_row_length;
         break;
+    case GL_RED_BITS:
+    case GL_GREEN_BITS:
+    case GL_BLUE_BITS:
+    case GL_ALPHA_BITS:
+    case GL_DEPTH_BITS:
+    case GL_STENCIL_BITS:
+        *data = sizeof(float) * 8;
+        break;
     default:
         // According to the Khronos docs, we always return GL_INVALID_ENUM if we encounter a non-accepted value
         // for `pname`