LibWeb/WebGL: Implement getProgramInfoLog()

Libraries/LibWeb/WebGL/WebGLRenderingContextBase.idl

@@ -116,7 +116,7 @@ interface mixin WebGLRenderingContextBase {
 
     [FIXME] any getFramebufferAttachmentParameter(GLenum target, GLenum attachment, GLenum pname);
     any getProgramParameter(WebGLProgram program, GLenum pname);
-    [FIXME] DOMString? getProgramInfoLog(WebGLProgram program);
+    DOMString? getProgramInfoLog(WebGLProgram program);
     [FIXME] any getRenderbufferParameter(GLenum target, GLenum pname);
     any getShaderParameter(WebGLShader shader, GLenum pname);
     [FIXME] WebGLShaderPrecisionFormat? getShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype);

Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateWebGLRenderingContext.cpp

@@ -582,6 +582,20 @@ public:
             continue;
         }
 
+        if (function.name == "getProgramInfoLog"sv) {
+            function_impl_generator.append(R"~~~(
+    GLint info_log_length = 0;
+    glGetProgramiv(program->handle(), GL_INFO_LOG_LENGTH, &info_log_length);
+    Vector<GLchar> info_log;
+    info_log.resize(info_log_length);
+    if (!info_log_length)
+        return String {};
+    glGetProgramInfoLog(program->handle(), info_log_length, nullptr, info_log.data());
+    return String::from_utf8_without_validation(ReadonlyBytes { info_log.data(), static_cast<size_t>(info_log_length - 1) });
+)~~~");
+            continue;
+        }
+
         Vector<ByteString> gl_call_arguments;
         for (size_t i = 0; i < function.parameters.size(); ++i) {
             auto const& parameter = function.parameters[i];